Search

Your search keyword '"D. J. Tedeschi"' showing total 156 results
Start Over Author "D. J. Tedeschi"
156 results on '"D. J. Tedeschi"'

1. Search for double- β decay of Ge76 to excited states of Se76 with the majorana demonstrator

Author

C. D. Christofferson, I. J. Arnquist, N. W. Ruof, C. J. Barton, J. Myslik, A. L. Reine, B. Bos, C. R. Haufe, J. M. López-Castaño, I. Kim, I. S. Guinn, T. K. Oli, C. Wiseman, G. Othman, C. Cuesta, F. E. Bertrand, T. R. Edwards, D. J. Tedeschi, Matthew Busch, V. E. Guiseppe, Ralph Massarczyk, D. W. Edwins, Yu. Efremenko, Eric W. Hoppe, T. Gilliss, A. Hostiuc, S. Vasilyev, C.-H. Yu, B. Sayki, J. F. Wilkerson, R. D. Martin, J. Gruszko, S. R. Elliott, P. H. Chu, Alan Poon, S. Mertens, J. A. Detwiler, D. Hervas Aguilar, Keith Rielage, A. Drobizhev, W. Xu, L. S. Paudel, M. F. Kidd, B. X. Zhu, M. P. Green, Y-D. Chan, H. Ejiri, M. Buuck, Walter C. Pettus, E. Blalock, S. J. Meijer, E. L. Martin, G. K. Giovanetti, Richard T. Kouzes, A. S. Barabash, D. C. Radford, T. S. Caldwell, M. Clark, F. T. Avignone, R. L. Varner, Reyco Henning, A. M. Lopez, and M. J. Stortini

Subjects
High probability, Physics, MAJORANA, Particle physics, 010308 nuclear & particles physics, Excited state, 0103 physical sciences, Detector array, 010306 general physics, 01 natural sciences
Abstract

Author(s): Arnquist, IJ; Avignone, FT; Barabash, AS; Barton, CJ; Bertrand, FE; Blalock, E; Bos, B; Busch, M; Buuck, M; Caldwell, TS; Chan, YD; Christofferson, CD; Chu, PH; Clark, ML; Cuesta, C; Detwiler, JA; Drobizhev, A; Edwards, TR; Edwins, DW; Efremenko, Y; Ejiri, H; Elliott, SR; Gilliss, T; Giovanetti, GK; Green, MP; Gruszko, J; Guinn, IS; Guiseppe, VE; Haufe, CR; Henning, R; Hervas Aguilar, D; Hoppe, EW; Hostiuc, A; Kidd, MF; Kim, I; Kouzes, RT; Lopez, AM; Lopez-Castano, JM; Martin, EL; Martin, RD; Massarczyk, R; Meijer, SJ; Mertens, S; Myslik, J; Oli, TK; Othman, G; Paudel, LS; Pettus, W; Poon, AWP; Radford, DC; Reine, AL; Rielage, K; Ruof, NW; Saykl, B; Stortini, MJ; Tedeschi, D; Varner, RL; Vasilyev, S; Wilkerson, JF; Wiseman, C; Xu, W; Yu, CH; Zhu, BX | Abstract: The majorana demonstrator is a neutrinoless double-β decay search consisting of a low-background modular array of high-purity germanium detectors, ∼2/3 of which are enriched to 88% in Ge76. The experiment is also searching for double-beta decay of Ge76 to excited states (e.s.) in Se76. Ge76 can decay into three daughter states of Se76, with clear event signatures consisting of a ββ-decay followed by the prompt emission of one or two γ rays. This results with high probability in multi-detector coincidences. The granularity of the demonstrator detector array enables powerful discrimination of this event signature from backgrounds. Using 41.9 kg yr of isotopic exposure, the demonstrator has set world leading limits for each e.s. decay of Ge76, with 90% CL lower half-life limits in the range of (0.75-4.0)×1024 yr. In particular, for the 2ν transition to the first 0+ e.s. of Se76, a lower half-life limit of 7.5×1023 yr at 90% CL was achieved.

Published
2021

2. Initial results from the Majorana Demonstrator

Author

V. B. Brudanin, Walter C. Pettus, F. E. Bertrand, C. Dunagan, Eric W. Hoppe, Keith Rielage, J. Myslik, D. J. Tedeschi, A. S. Barabash, T. S. Caldwell, M. P. Green, Kai Vetter, C. Wiseman, M. Shirchenko, H. Ejiri, C. R. Haufe, K. J. Keeter, J. E. Trimble, S. I. Alvis, C. D. Christofferson, Pinghan Chu, Ralph Massarczyk, S. I. Konovalov, I. Zhitnikov, Matthew Busch, B. Shanks, M. F. Kidd, T. Bode, V. E. Guiseppe, M. Buuck, F. T. Avignone, R. L. Varner, B. Bos, B. X. Zhu, G. Othman, I. J. Arnquist, N. W. Ruof, Reyco Henning, A. M. Lopez, Anne-Marie Suriano, T. Gilliss, J. A. Detwiler, J. F. Wilkerson, Yu. Efremenko, C. O'Shaughnessy, R. D. Martin, A. W. P. Poon, Vladimir Yumatov, Richard T. Kouzes, B. R. White, S. Vasilyev, R. G. H. Robertson, S. R. Elliott, L. Hehn, C. Cuesta, J. Rager, G. K. Giovanetti, N. Abgrall, D. C. Radford, A. L. Reine, K. Vorren, S. J. Meijer, J. Gruszko, A. W. Bradley, Susanne Mertens, E. Yakushev, W. Xu, M. A. Howe, Y-D. Chan, C.-H. Yu, I. S. Guinn, and C. J. Barton

Subjects
History, Particle physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, nucl-ex, 7. Clean energy, 01 natural sciences, Atomic, Education, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Point contact, Particle and Plasma Physics, 0103 physical sciences, Nuclear, Detector array, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, physics.ins-det, Physics, 010308 nuclear & particles physics, hep-ex, Detector, Molecular, Instrumentation and Detectors (physics.ins-det), Condensed Matter Physics, Computer Science Applications, Semiconductor detector, Other Physical Sciences, MAJORANA, Single lead
Abstract

Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The {\sc Majorana} Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The {\sc Majorana Demonstrator} is composed of 44.8~kg (29.7 kg enriched in $^{76}$Ge) of Ge detectors in total, split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. The initial goals of the {\sc Demonstrator} are to establish the required background and scalability of a Ge-based, next-generation, tonne-scale experiment. Following a commissioning run that began in 2015, the first detector module started physics data production in early 2016. We will discuss initial results of the Module 1 commissioning and first physics run, as well as the status and potential physics reach of the full {\sc Majorana Demonstrator} experiment. The collaboration plans to complete the assembly of the second detector module by mid-2016 to begin full data production with the entire array., Neutrino 2016 proceeding

Published
2020

3. Status of the MAJORANA DEMONSTRATOR

Author

D. Byram, Jonathan D. Leon, M. Shirchenko, T. Gilliss, John L. Orrell, Vladimir Yumatov, R. D. Martin, Alan Poon, M. P. Green, Anne-Marie Suriano, J. A. Detwiler, W. Xu, Stanley M. Howard, H. Ejiri, J. F. Wilkerson, C.-H. Yu, C.M. O'Shaughnessy, B. R. White, R. G. H. Robertson, Yu. Efremenko, M. Buuck, Keith Rielage, E. Romero-Romero, S. I. Konovalov, J. E. Trimble, J. Rager, A. Galindo-Uribarri, I. Zhitnikov, Matthew Busch, C. Cuesta, F. T. Avignone, Kai Vetter, S. Vasilyev, Yuen-Dat Chan, Brian D. LaFerriere, C. D. Christofferson, R. L. Varner, J. MacMullin, Reyco Henning, N. Abgrall, D. J. Tedeschi, I. S. Guinn, B. Shanks, B. R. Jasinski, Eric W. Hoppe, J. Gruszko, A. S. Caldwell, V. E. Guiseppe, K. Vorren, C. Wiseman, M. A. Howe, F. E. Bertrand, J. Goett, A. W. Bradley, S. R. Elliott, D. C. Radford, K. Keeter, E. Yakushev, A. S. Barabash, V.B. Brudanin, Richard T. Kouzes, C. X. Balderrot-Barrera, G. K. Giovanetti, S. J. Meijer, Susanne Mertens, M. F. Kidd, I. J. Arnquist, and N. Snyder

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, business.industry, Modular design, 01 natural sciences, Semiconductor detector, Nuclear physics, MAJORANA, 0103 physical sciences, Detector array, 010306 general physics, business
Abstract

The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultralow background, 40-kg modular high purity Ge (HPGe) detector array to search for neutrinoless double-beta decay (0νββ-decay) in 76Ge. The goal of the experiment is to demonstrate a background rate at or below 3 counts/(t-y) in the 4 keV region of interest (ROI) around the 2039 keV Q-value for 76Ge 0νββ-decay. In this paper, the status of the MAJORANA DEMONSTRATOR, including its design and measurements of properties of the HPGe crystals is presented.

Published
2017

4. Recent Results of the Majorana Demonstrator Experiment

Author

J. F. Wilkerson, Yuen-Dat Chan, B. R. White, A. S. Barabash, S. I. Konovalov, Keith Rielage, K. J. Keeter, M. A. Howe, G. Othman, J. M. López-Castaño, W. Xu, G. K. Giovanetti, M. Buuck, Yu. Efremenko, B. Bos, C. Wiseman, C. J. Barton, D. J. Tedeschi, V. Basu, T. K. Oli, F. T. Avignone, S. R. Elliott, R. L. Varner, J. Gruszko, Walter C. Pettus, A. Drobizhev, A. Hostiuc, Reyco Henning, C.-H. Yu, C. Cuesta, T. S. Caldwell, J. Rager, B. Shanks, S. Mertens, S. J. Meijer, Vladimir Yumatov, A. M. Lopez, V. E. Guiseppe, I. J. Arnquist, N. W. Ruof, M. Clark, Pinghan Chu, M. P. Green, M. Shirchenko, T. Gilliss, R. J. Hegedus, C. R. Haufe, R. D. Martin, S. I. Alvis, M. F. Kidd, B. X. Zhu, E. L. Martin, H. Ejiri, J. Myslik, D. W. Edwins, Ralph Massarczyk, D. Hervas Aguilar, I. Zhitnikov, D. C. Radford, A. Piliounis, Alan Poon, Matthew Busch, J. A. Detwiler, E. Yakushev, S. Vasilyev, I. S. Guinn, A. L. Reine, V. B. Brudanin, F. E. Bertrand, Richard T. Kouzes, Eric W. Hoppe, and C. D. Christofferson

Subjects
Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, chemistry.chemical_element, FOS: Physical sciences, Germanium, Instrumentation and Detectors (physics.ins-det), 7. Clean energy, 01 natural sciences, Lower limit, Background level, High Energy Physics - Experiment, Nuclear physics, MAJORANA, High Energy Physics - Experiment (hep-ex), chemistry, Double beta decay, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

The MAJORANA DEMONSTRATOR is searching for neutrinoless double-beta decay in $^{76}$Ge with two modular arrays of natural and $^{76}$Ge-enriched germanium detectors. It is located at the 4850 level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 $\pm$ 2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 10$^{25}$ yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination., MEDEX'19 proceedings. Since it was send to AIP, the last reference was published: S. I. Alvis et al. (Majorana Collaboration) Phys. Rev. C 100, 025501

Published
2019

5. Search for neutrinoless double- β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator

Author

F. T. Avignone, R. L. Varner, Reyco Henning, A. M. Lopez, S. J. Meijer, T. S. Caldwell, J. Gruszko, R. J. Hegedus, B. Bos, M. Clark, T. Gilliss, C. Wiseman, Yu. Efremenko, V. Basu, I. S. Guinn, R. D. Martin, S. R. Elliott, Vladimir Yumatov, Eric W. Hoppe, C. J. Barton, Susanne Mertens, E. Yakushev, M. P. Green, Keith Rielage, H. Ejiri, M. Shirchenko, J. F. Wilkerson, D. Hervas Aguilar, C.-H. Yu, M. Buuck, W. Xu, G. K. Giovanetti, A. L. Reine, B. R. White, M ajorana, Richard T. Kouzes, Y-D. Chan, D. J. Tedeschi, Walter C. Pettus, J. Myslik, J. Rager, A. Piliounis, A. S. Barabash, B. Shanks, V. E. Guiseppe, M. A. Howe, C. R. Haufe, S. I. Alvis, C. Cuesta, I. Zhitnikov, Matthew Busch, C. D. Christofferson, Ralph Massarczyk, D. C. Radford, S. Vasilyev, S. I. Konovalov, G. Othman, M. F. Kidd, B. X. Zhu, F. E. Bertrand, Pinghan Chu, L. Hehn, I. J. Arnquist, N. W. Ruof, A. W. P. Poon, and J. A. Detwiler

Subjects
Nuclear physics, Physics, MAJORANA, 010308 nuclear & particles physics, 13. Climate action, Double beta decay, 0103 physical sciences, Neutrino, Experimental methods, 010306 general physics, 01 natural sciences, Lower limit
Abstract

Author(s): Cuesta, C; Alvis, SI; Arnquist, IJ; Avignone, FT; Barabash, AS; Barton, CJ; Basu, V; Bertrand, FE; Bos, B; Busch, M; Buuck, M; Caldwell, TS; Chan, YD; Christofferson, CD; Chu, PH; Clark, M; Cuesta, C; Detwiler, JA; Efremenko, Y; Ejiri, H; Elliott, SR; Gilliss, T; Giovanetti, GK; Green, MP; Gruszko, J; Guinn, IS; Guiseppe, VE; Haufe, CR; Hegedus, RJ; Hehn, L; Henning, R; Hervas Aguilar, D; Hoppe, EW; Howe, MA; Kidd, MF; Konovalov, SI; Kouzes, RT; Lopez, AM; Martin, RD; Massarczyk, R; Meijer, SJ; Mertens, S; Myslik, J; Othman, G; Pettus, W; Piliounis, A; Poon, AWP; Radford, DC; Rager, J; Reine, AL; Rielage, K; Ruof, NW; Shanks, B; Shirchenko, M; Tedeschi, D; Varner, RL; Vasilyev, S; White, BR; Wilkerson, JF; Wiseman, C; Xu, W; Yakushev, E; Yu, CH; Yumatov, V; Zhitnikov, I; Zhu, BX | Abstract: The Majorana Collaboration is operating an array of high-purity Ge detectors to search for the neutrinoless double-β decay of Ge76. The Majorana Demonstrator consists of 44.1 kg of Ge detectors (29.7 kg enriched to 88% in Ge76) split between two modules constructed from ultraclean materials. Both modules are contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota. We present updated results on the search for neutrinoless double-β decay in Ge76 with 26.0±0.5 kg yr of enriched exposure. With the Demonstrator's energy resolution of 2.53 keV FWHM at Qββ, which is the best among all neutrinoless double-β decay experiments, we observe one event in the region of interest with 0.65 events expected from the estimated background, resulting in a lower limit on the Ge76 neutrinoless double-β decay half-life of 2.7×1025 yr [90% confidence level (CL)] with a median sensitivity of 4.8×1025 yr (90% CL). Depending on the matrix elements used, a 90% CL upper limit on the effective Majorana neutrino mass in the range of 200-433 meV is obtained. The measured background in the configurations with full shielding and optimized grounding is 11.9±2.0 counts/(FWHM t yr).

Published
2019

6. Multisite event discrimination for the majorana demonstrator

Author

T. S. Caldwell, Yuen-Dat Chan, Ralph Massarczyk, T. Gilliss, S. J. Meijer, C. J. Barton, M. Shirchenko, V. Basu, A. S. Barabash, K. J. Keeter, R. D. Martin, S. Vasilyev, J. Rager, M. A. Howe, D. Hervas Aguilar, J. Gruszko, C. R. Haufe, F. T. Avignone, R. L. Varner, S. I. Alvis, Reyco Henning, I. S. Guinn, J. F. Wilkerson, A. M. Lopez, Susanne Mertens, L. Hehn, E. Yakushev, B. R. White, I. Zhitnikov, C.-H. Yu, A. Piliounis, W. Xu, B. Shanks, C. Cuesta, M. P. Green, B. Bos, V. E. Guiseppe, G. K. Giovanetti, G. Othman, Richard T. Kouzes, D. C. Radford, H. Ejiri, D. J. Tedeschi, C. Wiseman, Pinghan Chu, F. E. Bertrand, S. I. Konovalov, J. A. Detwiler, Keith Rielage, I. J. Arnquist, N. W. Ruof, Walter C. Pettus, R. J. Hegedus, A. W. P. Poon, M. Buuck, M. F. Kidd, B. X. Zhu, S. R. Elliott, C. D. Christofferson, J. Myslik, Eric W. Hoppe, A. L. Reine, and Vladimir Yumatov

Subjects
Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, hep-ex, Molecular, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), nucl-ex, 01 natural sciences, Atomic, Nuclear & Particles Physics, High Energy Physics - Experiment, Combinatorics, MAJORANA, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, Affordable and Clean Energy, 0103 physical sciences, Pulse shape analysis, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, physics.ins-det
Abstract

The MAJORANA DEMONSTRATOR is searching for neutrinoless double-beta decay in 76Ge using arrays of point-contact germanium detectors operating at the Sanford Underground Research Facility. Background results in the neutrinoless double-beta decay region of interest from data taken during construction, commissioning, and the start of full operations have been recently published. A pulse shape analysis cut applied to achieve this result, named AvsE, is described in this paper. This cut is developed to remove events whose waveforms are typical of multi-site energy deposits while retaining (90 +/- 3.5)% of single-site events. This pulse shape discrimination is based on the relationship between the maximum current and energy, and tuned using 228Th calibration source data. The efficiency uncertainty accounts for variation across detectors, energy, and time, as well as for the position distribution difference between calibration and $0\nu\beta\beta$ events, established using simulations., Comment: 8 pages, 8 figures

Published
2019

7. High voltage testing for the Majorana Demonstrator

Author

Ralph Massarczyk, A. Galindo-Uribarri, Yuen-Dat Chan, S. Vasilyev, A. Li, A. Thompson, Alan Poon, N. Abgrall, Anne-Marie Suriano, J. A. Detwiler, Z. Fu, F. E. Bertrand, R. D. Martin, J. Gruszko, J. Goett, J. F. Wilkerson, R. G. H. Robertson, M. A. Howe, E. Romero-Romero, D. J. Tedeschi, B. R. White, C.M. O'Shaughnessy, Stanley M. Howard, Jonathan D. Leon, I. S. Guinn, F. T. Avignone, R. L. Varner, B. R. Jasinski, M. P. Green, M. Buuck, C. Wiseman, Reyco Henning, Eric W. Hoppe, C. Cuesta, J. Rager, D. Byram, Matthew Busch, Y.-U. Efremenko, P. J. Doe, C.-H. Yu, H. Ejiri, A. S. Barabash, Susanne Mertens, A. W. Bradley, V. Yumatov, K. J. Keeter, V.B. Brudanin, B. Shanks, V. E. Guiseppe, S. R. Elliott, Brian D. LaFerriere, D. C. Radford, A. S. Caldwell, Keith Rielage, M. Shirchenko, John L. Orrell, J. MacMullin, Kai Vetter, S. J. Meijer, C. D. Christofferson, K. Vorren, K. T. Ton, M. F. Kidd, E. Yakushev, C. Dunagan, S. I. Konovalov, W. Xu, G. K. Giovanetti, J. E. Trimble, Pinghan Chu, Richard T. Kouzes, I. J. Arnquist, and N. Snyder

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Vacuum, FOS: Physical sciences, Feedthrough, Context (language use), nucl-ex, Atomic, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Instrumentation, Physics, MAJORANA, hep-ex, 010308 nuclear & particles physics, business.industry, Detector, Electrical engineering, Molecular, High voltage, Instrumentation and Detectors (physics.ins-det), High-voltage, Micro-discharge, Modular design, Nuclear & Particles Physics, Semiconductor detector, Other Physical Sciences, business, Astronomical and Space Sciences, Voltage
Abstract

The MAJORANA Collaboration is constructing the MAJORANA Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in Ge-76. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the MAJORANA Demonstrator. This effect can damage the front-end electronics or mimic detector signals. To ensure the correct performance, every high-voltage cable and feedthrough must be capable of supplying HPGe detector operating voltages as high as 5 kV without exhibiting discharge. R&D measurements were carried out to understand the testing system and determine the optimum design configuration of the high-voltage path, including different improvements of the cable layout and feedthrough flange model selection. Every cable and feedthrough to be used at the MAJORANA Demonstrator was characterized and the micro-discharge effects during the MAJORANA Demonstrator commissioning phase were studied. A stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge., 9 pages, 12 figures, 8 tables, submitted to NIM A

Published
2016

8. Results of the MAJORANA DEMONSTRATOR’s Search for Double-Beta Decay of 76Ge to Excited States of 76Se

Author

Yu. Efremenko, T. Gilliss, S. R. Elliott, M. Clark, R. D. Martin, Ralph Massarczyk, G. K. Giovanetti, D. Hervas Aguilar, Walter C. Pettus, J. M. López-Castaño, V. E. Guiseppe, C. R. Haufe, C. D. Christofferson, C. Wiseman, E. L. Martin, Keith Rielage, B. Bos, C. Cuesta, C.-H. Yu, J. F. Wilkerson, Matthew Busch, A. S. Barabash, C. J. Barton, T. K. Oli, W. Xu, Yuen-Dat Chan, D. J. Tedeschi, Richard T. Kouzes, F. T. Avignone, R. L. Varner, Reyco Henning, R. J. Hegedus, Eric W. Hoppe, J. Myslik, A. M. Lopez, S. J. Meijer, A. L. Reine, M. J. Stortini, J. Rager, F. E. Bertrand, D. C. Radford, I. Kim, I. S. Guinn, M. F. Kidd, B. X. Zhu, M. P. Green, J. A. Detwiler, Pinghan Chu, G. Othman, D. W. Edwins, H. Ejiri, I. J. Arnquist, N. W. Ruof, A. Drobizhev, A. W. P. Poon, J. Gruszko, S. Mertens, T. S. Caldwell, A. Hostiuc, and M. Buuck

Subjects
Physics, High probability, History, 010308 nuclear & particles physics, FOS: Physical sciences, Molecular, nucl-ex, Condensed Matter Physics, Atomic, 01 natural sciences, Computer Science Applications, Education, Other Physical Sciences, MAJORANA, Particle and Plasma Physics, Double beta decay, Excited state, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), Detector array, 010306 general physics, Nuclear Experiment, Mathematical physics
Abstract

Author(s): Guinn, IS; Arnquist, IJ; Avignone, FT; Barabash, AS; Barton, CJ; Bertrand, FE; Bos, B; Busch, M; Buuck, M; Caldwell, TS; Chan, YD; Christofferson, CD; Chu, PH; Clark, ML; Cuesta, C; Detwiler, JA; Drobizhev, A; Edwins, DW; Efremenko, Y; Ejiri, H; Elliott, SR; Gilliss, T; Giovanetti, GK; Green, MP; Gruszko, J; Guiseppe, VE; Haufe, CR; Hegedus, RJ; Henning, R; Hervas Aguilar, D; Hoppe, EW; Hostiuc, A; Kidd, MF; Kim, I; Kouzes, RT; Lopez, AM; Lopez-Castano, JM; Martin, EL; Martin, RD; Massarczyk, R; Meijer, SJ; Mertens, S; Myslik, J; Oli, TK; Othman, G; Pettus, W; Poon, AWP; Radford, DC; Rager, J; Reine, AL; Rielage, K; Ruof, NW; Stortini, MJ; Tedeschi, D; Varner, RL; Wilkerson, JF; Wiseman, C; Xu, W; Yu, CH; Zhu, BX | Abstract: The MAJORANA DEMONSTRATOR is searching for double-beta decay of 76Ge to excited states (E.S.) in 76Se using a modular array of high purity Germanium detectors. 76Ge can decay into three E.S.s of 76Se. The E.S. decays have a clear event signature consisting of a ββ-decay with the prompt emission of one or two γ-rays, resulting in with high probability in a multi-site event. The granularity of the DEMONSTRATOR detector array enables powerful discrimination of this event signature from backgrounds. Using 21.3 kg-y of isotopic exposure, the DEMONSTRATOR has set world leading limits for each E.S. decay, with 90% CL lower half-life limits in the range of (0.56 2.1) ⋅ 1024 y. In particular, for the 2v transition to the first 0+ E.S. of 76Se, a lower half-life limit of 0.68 ⋅ 1024 at 90% CL was achieved.

Published
2020

9. Progress Toward A 2νββ Measurement For The Majorana Demonstrator

Author

Yuen-Dat Chan, G. K. Giovanetti, J. F. Wilkerson, K. Vorren, I. J. Arnquist, N. W. Ruof, C. Wiseman, A. W. P. Poon, C. R. Haufe, B. Shanks, M. A. Howe, J. Gruszko, S. I. Alvis, F. T. Avignone, I. S. Guinn, R. L. Varner, J. E. Trimble, V. E. Guiseppe, A. S. Barabash, Reyco Henning, Ralph Massarczyk, Pinghan Chu, A. M. Lopez, T. Gilliss, I. Zhitnikov, Matthew Busch, V. B. Brudanin, C. Dunagan, C.-H. Yu, S. Vasilyev, N. Abgrall, J. Rager, R. D. Martin, Keith Rielage, K. J. Keeter, R. G. H. Robertson, C. D. Christofferson, F. E. Bertrand, M. P. Green, A. W. Bradley, H. Ejiri, D. J. Tedeschi, M. F. Kidd, B. X. Zhu, E. Yakushev, Susanne Mertens, Eric W. Hoppe, T. S. Caldwell, J. Myslik, S. J. Meijer, S. I. Konovalov, V. Yumatov, G. Othman, S. R. Elliott, Yu. Efremenko, B. R. White, Anne-Marie Suriano, J. A. Detwiler, L. Hehn, C. Cuesta, C.M. O'Shaughnessy, M. Shirchenko, Richard T. Kouzes, T. Bode, D. C. Radford, Kai Vetter, Walter C. Pettus, A. L. Reine, W. Xu, C. J. Barton, and M. Buuck

Subjects
Physics, Nuclear physics, History, MAJORANA, Point contact, Muon, Energy spectrum, Computer Science Applications, Education
Abstract

Author(s): Gilliss, T; Abgrall, N; Alvis, SI; Arnquist, IJ; Avignone, FT; Barabash, AS; Barton, CJ; Bertrand, FE; Bode, T; Bradley, AW; Brudanin, V; Busch, M; Buuck, M; Caldwell, TS; Chan, YD; Christofferson, CD; Chu, PH; Cuesta, C; Detwiler, JA; Dunagan, C; Efremenko, Y; Ejiri, H; Elliott, SR; Giovanetti, GK; Green, MP; Gruszko, J; Guinn, IS; Guiseppe, VE; Haufe, CR; Hehn, L; Henning, R; Hoppe, EW; Howe, MA; Keeter, KJ; Kidd, MF; Konovalov, SI; Kouzes, RT; Lopez, AM; Martin, RD; Massarczyk, R; Meijer, SJ; Mertens, S; Myslik, J; O'Shaughnessy, C; Othman, G; Pettus, W; Poon, AWP; Radford, DC; Rager, J; Reine, AL; Rielage, K; Robertson, RGH; Ruof, NW; Shanks, B; Shirchenko, M; Suriano, AM; Tedeschi, D; Trimble, JE; Varner, RL; Vasilyev, S; Vetter, K; Vorren, K; White, BR; Wilkerson, JF; Wiseman, C; Xu, W; Yakushev, E; Yu, CH; Yumatov, V; Zhitnikov, I; Zhu, BX | Abstract: The MAJORANA DEMONSTRATOR is a 76Ge-based neutrinoless double-beta decay (0νββ) experiment. Staged at the 4850 ft level of the Sanford Underground Research Facility, the DEMONSTRATOR operates an array of high-purity p-Type point contact Ge detectors deployed within a graded passive shield and an active muon veto system. The present work concerns the two-neutrino double-beta decay mode (2νββ) of 76Ge. For Ge detectors, having superior energy resolution (0.1%), this mode poses negligible background to the 0νββ mode, even for a ton-scale experiment. However, the measurement of the 2νββ mode allows for careful systematics checks of active detector mass, enrichment fraction, and pulse shape discrimination cuts related to both the 0νββ and 2νββ decay modes. A precision measurement of the 2νββ shape also allows searches for spectral distortions, possibly indicative of new physics, including 0νββχ. Work is underway to construct a full experimental background model enabling a Bayesian fit to the measured energy spectrum and extraction of a precise 2νββ spectrum and half-life.

Published
2020

10. Initial results from the Majorana Demonstrator

Author

Ralph Massarczyk, J. Gruszko, M. Shirchenko, V. B. Brudanin, W. Xu, J. F. Wilkerson, S. Vasilyev, J. Rager, Keith Rielage, N. Abgrall, C. R. Haufe, T. Bode, C. J. Barton, S. I. Alvis, M. Buuck, C. Wiseman, G. K. Giovanetti, F. E. Bertrand, B. Bos, Walter C. Pettus, G. Othman, C. Dunagan, I. Zhitnikov, Matthew Busch, J. E. Trimble, A. W. Bradley, Eric W. Hoppe, Pinghan Chu, D. J. Tedeschi, I. J. Arnquist, N. W. Ruof, Yu. Efremenko, T. S. Caldwell, E. Yakushev, A. S. Barabash, C.-H. Yu, M. F. Kidd, I. S. Guinn, L. Hehn, B. Shanks, C. D. Christofferson, V. E. Guiseppe, B. X. Zhu, A. W. P. Poon, C. Cuesta, D. C. Radford, T. Gilliss, R. D. Martin, R. G. H. Robertson, A. L. Reine, K. Vorren, Kai Vetter, M. A. Howe, Richard T. Kouzes, B. R. White, S. J. Meijer, M. P. Green, H. Ejiri, Susanne Mertens, K. J. Keeter, C. O׳Shaughnessy, F. T. Avignone, R. L. Varner, Reyco Henning, A. M. Lopez, Chan Y-D., J. Myslik, S. I. Konovalov, V. Yumatov, S. R. Elliott, Anne-Marie Suriano, and J. A. Detwiler

Subjects
Physics, History, MAJORANA, Particle physics, Full data, Neutrino, Computer Science Applications, Education
Abstract

Author(s): Elliott, SR; Abgrall, N; Arnquist, IJ; Avignone, FT; Barabash, AS; Bertrand, FE; Bradley, AW; Brudanin, V; Busch, M; Buuck, M; Caldwell, TS; Chan, YD; Christofferson, CD; Chu, PH; Cuesta, C; Detwiler, JA; Dunagan, C; Efremenko, Y; Ejiri, H; Fullmer, A; Galindo-Uribarri, A; Gilliss, T; Giovanetti, GK; Green, MP; Gruszko, J; Guinn, IS; Guiseppe, VE; Henning, R; Hoppe, EW; Howe, MA; Jasinski, BR; Keeter, KJ; Kidd, MF; Konovalov, SI; Kouzes, RT; Leon, J; Lopez, AM; Macmullin, J; Martin, RD; Massarczyk, R; Meijer, SJ; Mertens, S; Orrell, JL; O'Shaughnessy, C; Poon, AWP; Radford, DC; Rager, J; Rielage, K; Robertson, RGH; Romero-Romero, E; Shanks, B; Shirchenko, M; Suriano, AM; Tedeschi, D; Trimble, JE; Varner, RL; Vasilyev, S; Vetter, K; Vorren, K; White, BR; Wilkerson, JF; Wiseman, C; Xu, W; Yakushev, E; Yu, CH; Yumatov, V; Zhitnikov, I | Abstract: Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The Majorana Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. The Majorana Demonstrator is composed of 44.8 kg (29.7 kg enriched in 76Ge) of Ge detectors in total, split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. The initial goals of the Demonstrator are to establish the required background and scalability of a Ge-based, next-generation, tonne-scale experiment. Following a commissioning run that began in 2015, the first detector module started physics data production in early 2016. We will discuss initial results of the Module 1 commissioning and first physics run, as well as the status and potential physics reach of the full Majorana Demonstrator experiment. The collaboration plans to complete the assembly of the second detector module by mid-2016 to begin full data production with the entire array.

Published
2020

11. Photoproduction of K+K− meson pairs on the proton

Author

G. Ricco, R. A. Schumacher, K. Mikhailov, L. Bibrzycki, P. Stoler, A. D'Angelo, K. Hicks, H. Hakobyan, Ashot Gasparian, L. Gan, V. Mokeev, A.V. Stavinsky, K. Livingston, D. S. Dale, S. Anefalos Pereira, A. V. Vlassov, D. J. Tedeschi, V. V. Mochalov, K. A. Griffioen, S. Fegan, E. Clinton, Michael Wood, N. Hassall, M. Bellis, K. Hafidi, Michael Vineyard, R. De Vita, S. Stepanyan, C. Bookwalter, P. Nadel-Turonski, M. Kossov, Avraham Klein, T. Mineeva, V. Drozdov, S. Strauch, V. Kuznetsov, Friedrich Klein, D. P. Watts, E. L. Isupov, E. Munevar, H. Egiyan, I. Nakagawa, I. Bedlinskiy, Brian Raue, W. J. Briscoe, Michael L. Williams, A. Kubarovsky, W. Gohn, E. Wolin, Lorenzo Zana, M. Y. Gabrielyan, C. E. Hyde, O. Glamazdin, M. R. Niroula, Z. W. Zhao, S. Niccolai, Y. Prok, D. S. Carman, M. Battaglieri, Barry Ritchie, N. Pivnyuk, I. I. Strakovsky, D. Protopopescu, C. Salgado, E. De Sanctis, M. Garçon, S. Pozdniakov, A. Deur, G. E. Dodge, Martin K. Mayer, G. Rosner, H. Y. Lu, Kei Moriya, C. A. Meyer, M. Osipenko, N. Dashyan, D. I. Sober, F. X. Girod, E. Pasyuk, G. V. Fedotov, S. Tkachenko, Adam P. Szczepaniak, M. S. Saini, I. Niculescu, P. Eugenio, H. Baghdasaryan, K. P. Adhikari, D. P. Weygand, E. Golovatch, M. Taiuti, J. T. Goetz, D. Schott, J. W. Price, C. Djalali, F. Sabatié, V. P. Kubarovsky, O. Pogorelko, W. Kim, P. Collins, M. Anghinolfi, Leonard Lesniak, H. Seraydaryan, J. Zhang, P. Khetarpal, Y. G. Sharabian, C. S. Nepali, M. Ripani, V. Crede, C. Hanretty, J. R. Johnstone, L. Guo, M. Ungaro, S. Park, P. Rossi, K. Joo, M. Guidal, M. Holtrop, A. Daniel, A. I. Ostrovidov, K. Park, Sergey Kuleshov, D. G. Ireland, S. S. Stepanyan, Mark W. Paris, B. Zhao, Volker D. Burkert, A. S. Biselli, S. Dhamija, R. W. Gothe, A. Fradi, M. J. Amaryan, J. Goett, B. McKinnon, D. Branford, S. Pisano, M. Mirazita, S. L. Careccia, J. M. Laget, K. L. Giovanetti, Larry Weinstein, D. Keller, Gerard Gilfoyle, M. Khandaker, M. E. McCracken, Y. Ilieva, D. Sokhan, D. Doughty, A. Teymurazyan, and P. L. Cole

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Elementary particle, 01 natural sciences, 7. Clean energy, Particle decay, Pion, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The exclusive reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ was studied in the photon energy range 3.0--3.8 GeV and the momentum transfer range $0.4l\ensuremath{-}tl1.0\text{ }\text{ }{\mathrm{GeV}}^{2}$. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. In this kinematic range, the integrated luminosity was about $20\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. The reaction was isolated by detecting the ${\ensuremath{\pi}}^{+}$ and proton in CLAS, and reconstructing the ${\ensuremath{\pi}}^{\ensuremath{-}}$ via the missing-mass technique. Moments of the di-pion decay angular distributions were derived from the experimental data. Differential cross sections for the $S$, $P$, and $D$-waves, in the ${M}_{{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}}$ mass range 0.4--1.4 GeV, were derived performing a partial wave expansion of the extracted moments. Beside the dominant contribution of the $\ensuremath{\rho}(770)$ meson in the $P$-wave, evidence for the ${f}_{0}(980)$ and the ${f}_{2}(1270)$ mesons was found in the $S$ and $D$-waves, respectively. The differential production cross sections $d\ensuremath{\sigma}/dt$ for individual waves in the mass range of the above-mentioned mesons were extracted. This is the first time the ${f}_{0}(980)$ has been measured in a photoproduction experiment.

Published
2018

12. First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as e/1000 with the Majorana Demonstrator

Author

Ralph Massarczyk, S. Vasilyev, V. Yumatov, Richard T. Kouzes, I. J. Arnquist, N. W. Ruof, T. Gilliss, Keith Rielage, C. Wiseman, S. R. Elliott, Yu. Efremenko, R. D. Martin, W. Xu, M. A. Howe, Y-D. Chan, G. Othman, Eric W. Hoppe, R. G. H. Robertson, S. I. Konovalov, Walter C. Pettus, A. L. Reine, G. K. Giovanetti, T. S. Caldwell, C. R. Haufe, C. D. Christofferson, C.-H. Yu, J. F. Wilkerson, S. I. Alvis, D. J. Tedeschi, S. J. Meijer, I. S. Guinn, B. X. Zhu, I. Zhitnikov, Matthew Busch, B. Shanks, C. Cuesta, V. E. Guiseppe, C. J. Barton, Pinghan Chu, J. Gruszko, F. E. Bertrand, J. Myslik, Alan Poon, C. Dunagan, Susanne Mertens, Anne-Marie Suriano, M. Buuck, J. A. Detwiler, L. Hehn, M. P. Green, F. T. Avignone, H. Ejiri, R. L. Varner, D. C. Radford, E. Yakushev, Reyco Henning, C.M. O'Shaughnessy, A. M. Lopez, V.B. Brudanin, J. Rager, B. R. White, K. Vorren, M. Shirchenko, and A. S. Barabash

Subjects
Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, Electric charge, Particle detector, Standard Model, Semiconductor detector, Nuclear physics, MAJORANA, Double beta decay, 0103 physical sciences, Grand Unified Theory, High Energy Physics::Experiment, 010306 general physics, Radioactive decay
Abstract

The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ^{76}Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. Free, relativistic, lightly ionizing particles with an electrical charge less than e are forbidden by the standard model but predicted by some of its extensions. If such particles exist, they might be detected in the Majorana Demonstrator by searching for multiple-detector events with individual-detector energy depositions down to 1 keV. This search is background-free, and no candidate events have been found in 285 days of data taking. New direct-detection limits are set for the flux of lightly ionizing particles for charges as low as e/1000.

Published
2018

13. Search for Neutrinoless Double- β Decay in Ge76 with the Majorana Demonstrator

Author

S. I. Alvis, D. J. Tedeschi, I. Zhitnikov, J. C. Loach, M. Boswell, J. I. Collar, B. R. Jasinski, J. Myslik, C. O'Shaughnessy, L. E. Leviner, Henning O. Back, J. MacMullin, Kai Vetter, W. Xu, V. Yumatov, I. S. Guinn, D. M. Mei, R. A. Johnson, Ronald L. Brodzinski, M. F. Kidd, Yuen-Dat Chan, T. S. Caldwell, A. W. Bradley, A. S. Caldwell, S. I. Konovalov, E. Aguayo, S. R. Elliott, M. Busch, M. Shirchenko, John L. Orrell, P. H. Chu, G. Othman, Reynold J. Cooper, Ralph Massarczyk, A. Galindo-Uribarri, Craig E. Aalseth, M. C. Ronquest, J. Goett, C. J. Barton, K. T. Lesko, S. Zimmermann, T. Gilliss, J. E. Trimble, D. Steele, C. Wiseman, B. K. Fujikawa, K. Vorren, S. Vasilyev, H. Yaver, J. Gruszko, I. J. Arnquist, N. W. Ruof, Keith Rielage, N. Snyder, P. Finnerty, Alexis G. Schubert, C. D. Christofferson, Harry S. Miley, Paul N. Luke, M. Buuck, M. A. Howe, A. L. Hallin, N. Abgrall, Yu. Efremenko, Alan Poon, J. Rager, Anne-Marie Suriano, Paul Barton, A. B. McDonald, J. A. Detwiler, Jonathan D. Leon, James E. Fast, A. S. Barabash, J. H. Merriman, C. Cuesta, R. Henning, C. R. Haufe, A. Knecht, Erin S. Fuller, F. E. Bertrand, F. T. Avignone, R. L. Varner, Michael G. Marino, D. C. Radford, K. J. Snavely, C.-H. Yu, A. M. Lopez, J.H. Reeves, K. Pushkin, T. Bode, E. Yakushev, P. J. Doe, Walter C. Pettus, Todd W. Hossbach, B. X. Zhu, A. L. Reine, K. J. Keeter, V.B. Brudanin, P. S. Barbeau, Nicole R. Overman, A. R. Young, D. G. Phillips, Brian D. LaFerriere, V. E. Guiseppe, J. A. Dunmore, G. K. Giovanetti, M. L. Miller, R. D. Martin, Eric W. Hoppe, Richard T. Kouzes, Susanne Mertens, R. G. H. Robertson, B. Shanks, Jeremy D. Kephart, Werner Tornow, D. C. Combs, Z. Fu, S.J. J Meijer, B. Bos, F. M. Fraenkle, G. Perumpilly, V. M. Gehman, J. F. Wilkerson, B. R. White, L. Hehn, M. P. Green, S. MacMullin, H. Ejiri, and Mark Amman

Subjects
Physics, Semileptonic decay, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, Semiconductor detector, Nuclear physics, Full width at half maximum, MAJORANA, Double beta decay, 0103 physical sciences, Neutrino, 010306 general physics, Neutrino oscillation, Energy (signal processing)
Abstract

The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in ^{76}Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Q_{ββ} and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9×10^{25} yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0_{-2.5}^{+3.1} counts/(FWHM t yr).

Published
2018

14. The Majorana Demonstrator Status and Preliminary Results

Author

F. E. Bertrand, W. Xu, F. T. Avignone, G. K. Giovanetti, C. J. Barton, R. L. Varner, Reyco Henning, Ralph Massarczyk, A. M. Lopez, M. Buuck, T. Gilliss, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, D. J. Tedeschi, S. Vasilyev, S. I. Konovalov, Eric W. Hoppe, C. Wiseman, R. D. Martin, T. S. Caldwell, Pinghan Chu, J. Myslik, A. S. Barabash, Walter C. Pettus, C. Dunagan, Richard T. Kouzes, Kai Vetter, V. Yumatov, Keith Rielage, I. J. Arnquist, N. W. Ruof, C.-H. Yu, C. D. Christofferson, J. Gruszko, S. R. Elliott, B. Shanks, M. F. Kidd, V. E. Guiseppe, S. Mertens, L. Hehn, M. P. Green, B. R. White, Yuen-Dat Chan, H. Ejiri, E. Yakushev, K. Vorren, M. A. Howe, G. Othman, J. Rager, J. F. Wilkerson, D. C. Radford, S. J. Meijer, I. S. Guinn, A. L. Reine, B. Z. Zhu, K. J. Keeter, V.B. Brudanin, M. Shirchenko, T. Bode, Yu. Efremenko, C. R. Haufe, S. I. Alvis, C. Cuesta, I. Zhitnikov, Matthew Busch, and Sun, Yang

Subjects
Physics, Particle physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, QC1-999, Detector, High Energy Physics::Phenomenology, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), nucl-ex, 7. Clean energy, 01 natural sciences, Lepton number, MAJORANA, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, physics.ins-det
Abstract

The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q$_{\beta\beta}$. The Majorana collaboration began taking physics data in 2016. This paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data., Comment: 5 pages, 2 figures. Proceeding for the "16th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS16)", 18-22 September 2017

Published
2018
Full Text
View/download PDF

15. The processing of enriched germanium for the Majorana Demonstrator and R&D for a next generation double-beta decay experiment

Author

Ralph Massarczyk, G. K. Giovanetti, C. Wiseman, C. R. Haufe, S. Vasilyev, J. F. Wilkerson, F. E. Bertrand, Kai Vetter, N. Abgrall, I. S. Guinn, A. S. Barabash, I. Zhitnikov, Matthew Busch, D. C. Radford, M. P. Green, B. Shanks, V. E. Guiseppe, W. Xu, H. Ejiri, S. J. Meijer, J. Myslik, J. Caja, C. Dunagan, J. Rager, B. R. Jasinski, A. L. Reine, S. I. Konovalov, Yu. Efremenko, L.M. Toth, J. Gruszko, F. T. Avignone, C.M. O'Shaughnessy, R. L. Varner, C. D. Christofferson, C.-H. Yu, Reyco Henning, Keith Rielage, T. Gilliss, J. Goett, A. M. Lopez, V. Yumatov, J.H. Meyer, C. Cuesta, S. R. Elliott, R. D. Martin, A. W. Bradley, Eric W. Hoppe, K. Vorren, V.B. Brudanin, E. Yakushev, R. G. H. Robertson, T. S. Caldwell, M. Shirchenko, D. J. Tedeschi, M. Caja, Susanne Mertens, M. F. Kidd, B. X. Zhu, I. J. Arnquist, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, J.A. Reising, J. E. Trimble, Pinghan Chu, D.T. Dunstan, B. R. White, J. MacMullin, M. Buuck, and Richard T. Kouzes

Subjects
Physics, Nuclear and High Energy Physics, Isotopes of germanium, 010308 nuclear & particles physics, Detector, chemistry.chemical_element, Germanium, 7. Clean energy, 01 natural sciences, Particle detector, Semiconductor detector, ddc, Nuclear physics, MAJORANA, chemistry, Double beta decay, 0103 physical sciences, 010306 general physics, Instrumentation, Radioactive decay
Abstract

The Majorana Demonstrator is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in 76 Ge to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in 76 Ge special procedures were required to maximize the yield of detector mass and to minimize exposure to cosmic rays. These procedures include careful accounting for the material; shielding it to reduce cosmogenic generation of radioactive isotopes; and development of special reprocessing techniques for contaminated solid germanium, shavings, grindings, acid etchant and cutting fluids from detector fabrication. Processing procedures were developed that resulted in a total yield in detector mass of 70%. However, none of the acid-etch solution and only 50% of the cutting fluids from detector fabrication were reprocessed. Had they been processed, the projections for the recovery yield would be between 80% and 85%. Maximizing yield is critical to justify a possible future ton-scale experiment. A process for recovery of germanium from the acid-etch solution was developed with yield of about 90%. All material was shielded or stored underground whenever possible to minimize the formation of 68 Ge by cosmic rays, which contributes background in the double-beta decay region of interest and cannot be removed by zone refinement and crystal growth. Formation of 68 Ge was reduced by a significant factor over that in natural abundance detectors not protected from cosmic rays.

Published
2018

16. The Majorana Demonstrator radioassay program

Author

T. Gilliss, M. L. Miller, C. D. Christofferson, J. Goett, R. D. Martin, N. Abgrall, Ralph Massarczyk, A. Galindo-Uribarri, J. Gruszko, A. S. Caldwell, R. G. H. Robertson, Stanley M. Howard, M. P. Green, Nicole R. Overman, W. Xu, Kai Vetter, H. Ejiri, S. Meijer, C.-H. Yu, B. R. Jasinski, Anne-Marie Suriano, J. A. Detwiler, J. E. Trimble, V. E. Guiseppe, V. M. Gehman, F. T. Avignone, B. Shanks, R. L. Varner, K. Vorren, I. S. Guinn, Reyco Henning, D. C. Radford, O.I. Kochetov, K. J. Snavely, Eric W. Hoppe, R. A. Johnson, M. F. Kidd, Keith Rielage, Yuen-Dat Chan, A. W. Bradley, S. Vasilyev, D. Byram, M. Buuck, S. I. Konovalov, Henning O. Back, G. K. Giovanetti, K. Pushkin, I. Zhitnikov, Matthew Busch, M. A. Howe, J. F. Wilkerson, J. C. Loach, Pinghan Chu, D. J. Tedeschi, Richard T. Kouzes, A. S. Barabash, Jonathan D. Leon, S. MacMullin, P. Finnerty, B. R. White, C. Wiseman, K. J. Keeter, V.B. Brudanin, J. Rager, J. MacMullin, Alexis G. Schubert, V. Yumatov, C. O'Shaughnessy, S. R. Elliott, J. A. Dunmore, E. Yakushev, Susanne Mertens, M. C. Ronquest, E. Romero-Romero, Yu. Efremenko, C. Cuesta, Brian D. LaFerriere, M. Shirchenko, John L. Orrell, F. E. Bertrand, M. Boswell, D. Steele, I. J. Arnquist, N. Snyder, and A. W. P. Poon

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, Context (language use), Radiopurity, nucl-ex, 7. Clean energy, 01 natural sciences, Atomic, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Mass spectroscopy, Particle and Plasma Physics, Germanium counting, Double beta decay, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), Neutron activation analysis, 010306 general physics, Nuclear Experiment, Instrumentation, physics.ins-det, Low background, Physics, MAJORANA, Mass spectrometry, 010308 nuclear & particles physics, hep-ex, Detector, Molecular, Trace analysis, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Semiconductor detector, Other Physical Sciences, Astronomical and Space Sciences, Neutron activation
Abstract

The MAJORANA collaboration is constructing the MAJORANA DEMONSTATOR at the Sanford Underground Research Facility at the Homestake gold mine, in Lead, SD. The apparatus will use Ge detectors, enriched in isotope \nuc{76}{Ge}, to demonstrate the feasibility of a large-scale Ge detector experiment to search for neutrinoless double beta decay. The long half-life of this postulated process requires that the apparatus be extremely low in radioactive isotopes whose decays may produce backgrounds to the search. The radioassay program conducted by the collaboration to ensure that the materials comprising the apparatus are sufficiently pure is described. The resulting measurements of the radioactive-isotope contamination for a number of materials studied for use in the detector are reported., to be submitted to NIM

Published
2016

17. Muon Flux Measurements at the Davis Campus of the Sanford Underground Research Facility with the Majorana Demonstrator Veto System

Author

Jonathan D. Leon, C. Schmitt, J. Gruszko, T. Gilliss, A. S. Barabash, I. S. Guinn, R. D. Martin, B. R. Jasinski, Keith Rielage, W. Xu, E. Aguayo, Brian D. LaFerriere, R. G. H. Robertson, J. MacMullin, Yu. Efremenko, C. Wiseman, M. P. Green, V. Yumatov, D. Byram, C. Dunagan, C.-H. Yu, E. Romero-Romero, A. W. Bradley, S. R. Elliott, H. Ejiri, J. F. Wilkerson, Ralph Massarczyk, A. Galindo-Uribarri, M. F. Kidd, Nicole R. Overman, D. J. Tedeschi, B. R. White, C. Cuesta, Yuen-Dat Chan, S. Vasilyev, N. Abgrall, J. Goett, Eric W. Hoppe, M. Shirchenko, I. Zhitnikov, Matthew Busch, John L. Orrell, B. Shanks, K. J. Keeter, V.B. Brudanin, V. E. Guiseppe, K. Vorren, J. E. Trimble, Susanne Mertens, Kai Vetter, Pinghan Chu, C.M. O'Shaughnessy, C. D. Christofferson, F. E. Bertrand, F. T. Avignone, M. A. Howe, R. L. Varner, J. Rager, Reyco Henning, D. C. Radford, A. M. Lopez, A. S. Caldwell, S. I. Konovalov, G. K. Giovanetti, Richard T. Kouzes, Stanley M. Howard, S. J. Meijer, M. Buuck, E. Yakushev, M. C. Ronquest, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, and N. Snyder

Subjects
Physics - Instrumentation and Detectors, Ray, Veto, Flux, FOS: Physical sciences, nucl-ex, 01 natural sciences, Atomic, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Physics, Muon, 010308 nuclear & particles physics, hep-ex, Molecular, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, MAJORANA, Muon flux, Cosmic, Astronomical and Space Sciences
Abstract

We report the first measurement of the total MUON flux underground at the Davis Campus of the Sanford Underground Research Facility at the 4850 ft level. Measurements were done with the Majorana Demonstrator veto system arranged in two different configurations. The measured total flux is (5.31+/-0.17) x 10^-9 muons/s/cm^2., 15 pages, 7 figures

Published
2016

18. New limits on Bosonic Dark Matter, Solar Axions, Pauli Exclusion Principle Violation, and Electron Decay from the Majorana Demonstrator

Author

M. P. Green, H. Ejiri, W. Xu, Eric W. Hoppe, J. Goett, Kai Vetter, M. Shirchenko, C. R. Haufe, C. D. Christofferson, D. C. Radford, I. Zhitnikov, Matthew Busch, Keith Rielage, T. Gilliss, K. Vorren, I. J. Arnquist, I. S. Guinn, Richard T. Kouzes, R. D. Martin, C. Dunagan, C.-H. Yu, Yu. Efremenko, Stanley M. Howard, J. Rager, A. S. Barabash, R. G. H. Robertson, T. S. Caldwell, A. L. Reine, C. Cuesta, S. I. Konovalov, C. Wiseman, G. K. Giovanetti, D. J. Tedeschi, B. Shanks, V. E. Guiseppe, B. R. White, V. Yumatov, E. Yakushev, J. F. Wilkerson, Yuen-Dat Chan, S. R. Elliott, M. F. Kidd, B. X. Zhu, F. E. Bertrand, M. A. Howe, C.M. O'Shaughnessy, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, J. MacMullin, J. Gruszko, J. E. Trimble, Pinghan Chu, M. Buuck, S. J. Meijer, Susanne Mertens, K. J. Keeter, V.B. Brudanin, F. T. Avignone, R. L. Varner, Reyco Henning, A. M. Lopez, B. R. Jasinski, A. W. Bradley, Ralph Massarczyk, S. Vasilyev, and N. Abgrall

Subjects
Physics, Particle physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Dark matter, High Energy Physics::Phenomenology, General Physics and Astronomy, FOS: Physical sciences, Electron, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Vector boson, Pseudoscalar, Nuclear physics, symbols.namesake, MAJORANA, Pauli exclusion principle, WIMP, 0103 physical sciences, symbols, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Axion
Abstract

We present new limits on exotic keV-scale physics based on 478 kg d of MAJORANA DEMONSTRATOR commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal-limits above our background. Our most stringent DM constraints are set for 11.8 keV mass particles, limiting $g_{Ae} 1.2 \times 10^{24}\;$yr for $e^- \rightarrow$ invisible.

Published
2016
Full Text
View/download PDF

19. Evidence for the onset of color transparency in ρ0 electroproduction off nuclei

Author

G. Niculescu, S. Tkachenko, R. Dupre, M. Battaglieri, L. Guo, P. Khetarpal, R. De Vita, Paolo Rossi, C. Djalali, G. Ricco, Martin K. Mayer, S. Anefalos Pereira, G. E. Dodge, H. Y. Lu, F. X. Girod, V. Mokeev, Barry Ritchie, P. E. Reimer, B. Vernarsky, J. W. Price, V. Kuznetsov, M. S. Saini, E. Voutier, S. Procureur, F. Sabatié, A. Kim, B. Zhao, I. Niculescu, D. G. Ireland, Friedrich Klein, Brian Raue, V. Crede, W. Tang, M. Ripani, K. A. Griffioen, Michael Vineyard, E. De Sanctis, M. Aghasyan, D. I. Sober, J. T. Goetz, W. Gohn, T. Mineeva, D. Schott, P. Nadel-Turonski, M. Osipenko, Y. Mao, V. P. Kubarovsky, S. Niccolai, C. E. Hyde, S. S. Jawalkar, J. Arrington, P. Stoler, Latifa Elouadrhiri, C. A. Meyer, B. Dey, I. J. D. MacGregor, E. Munevar, B. S. Ishkhanov, S. E. Kuhn, C. Hanretty, K. Hicks, G. V. Fedotov, H. Avakian, E. L. Isupov, K. P. Adhikari, A. Celentano, R. W. Gothe, A. Deur, D. P. Weygand, Elton Smith, George Davey Smith, D. J. Tedeschi, H. Voskanyan, R. A. Schumacher, P. Eugenio, M. Taiuti, M. Anghinolfi, W. J. Briscoe, E. Pasyuk, W. K. Brooks, I. Bedlinskiy, H. Seraydaryan, Lorenzo Zana, S. Park, Y. G. Sharabian, A. D'Angelo, H. Hakobyan, S. Bültmann, X. Zheng, A. I. Ostrovidov, K. Park, M. Contalbrigo, R. J. Holt, C. E. Taylor, S. Stepanyan, C. Salgado, Avraham Klein, L. El Fassi, A. Ni, E. Golovatch, M. Ungaro, J. McAndrew, Z. W. Zhao, Michael Wood, Volker D. Burkert, K. Hafidi, A. S. Biselli, B. McKinnon, D. Branford, M. Mirazita, E. Phelps, J. M. Laget, S. S. Stepanyan, N. Gevorgyan, V. Batourine, N. Markov, D. Keller, Sergey Kuleshov, M. Khandaker, Hovanes Egiyan, M. J. Amaryan, R. Paremuzyan, H. Moutarde, K. L. Giovanetti, Larry Weinstein, Gerard Gilfoyle, D. Doughty, D. Heddle, D. Sokhan, D. Adikaram, M. Guidal, B. Mustapha, M. Holtrop, A. Daniel, Luciano Pappalardo, G. Rosner, A. El Alaoui, Y. Ilieva, Nicholas Zachariou, D. Rimal, B. Moreno, R. Dickson, P. L. Cole, D. Protopopescu, S. Pozdniakov, M. Garçon, S. Chandavar, S. Strauch, D. P. Watts, M. Y. Gabrielyan, D. S. Carman, N. Dashyan, H. Baghdasaryan, S. Fegan, C. Bookwalter, and W. Kim

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Virtual particle, Electron, 01 natural sciences, Coherence length, Nuclear physics, Color model, Deuterium, Nuclear transparency, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

We have measured the nuclear transparency of the incoherent diffractive A(e,e′ρ0) process in 12C and 56Fe targets relative to 2H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced ρ0ʼs on a nucleus relative to deuterium, which is sensitive to ρA interaction, was studied as function of the coherence length (lc), a lifetime of the hadronic fluctuation of the virtual photon, and the four-momentum transfer squared (Q2). While the transparency for both 12C and 56Fe showed no lc dependence, a significant Q2 dependence was measured, which is consistent with calculations that included the color transparency effects.

Published
2012

20. Search for φ-Meson Nuclear Bound States in the \overlinep + AZ →φ+ A-1φ(Z-1) Reaction

Author

C. Guaraldo, Kyo Tsukada, J. Zmeskal, Paul Kienle, Florin Sirghi, A. Romero Vidal, Ryotaro Muto, O. N. Hartmann, M. Niiyama, Catalina Curceanu, Johann Marton, O. Vazquez Doce, Atsushi Sakaguchi, S. Yokkaichi, Hiroyuki Noumi, Hiroaki Ohnishi, Paul Alois Buhler, M. Iwasaki, D. J. Tedeschi, Shinji Okada, Ken Suzuki, Eberhard Widmann, Fuminori Sakuma, S. Sawada, T. Ishiwatari, K. Hicks, and Diana Sirghi

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Bound state
Published
2010

21. Differential cross section of γn→K+Σ− on bound neutrons with incident photons from 1.1 to 3.6 GeV

Author

A. I. Ostrovidov, K. Park, M. E. McCracken, D. G. Ireland, Michael Dugger, Volker D. Burkert, A. S. Biselli, V. P. Kubarovsky, Lorenzo Zana, Sergey Kuleshov, H. S. Jo, C. Salgado, K. A. Griffioen, O. Pogorelko, D. Protopopescu, L. Guo, P. Nadel-Turonski, S. Fegan, R. De Vita, M. Osipenko, S. S. Stepanyan, S. Pozdniakov, W. Gohn, S. Procureur, C. Bookwalter, S. Anefalos Pereira, K. Mikhailov, F. Sabatié, M. Guidal, S. Dhamija, V. Crede, N. Dashyan, W. J. Briscoe, E. Pasyuk, Y. Perrin, T. Mineeva, R. W. Gothe, E. De Sanctis, S. L. Careccia, R. Dupre, M. Holtrop, A. Daniel, Gerard Gilfoyle, G. Ricco, M. Aghasyan, P. Eugenio, M. Battaglieri, J. Salamanca, Friedrich Klein, Brian Raue, K. Joo, D. Sokhan, E. Munevar, D. I. Sober, S. Pisano, B. S. Ishkhanov, B. Morrison, G. Gavalian, S. Tkachenko, W. Kim, B. Zhao, H. Baghdasaryan, M. Ripani, P. L. Cole, B. McKinnon, C. Djalali, G. Niculescu, A. El Alaoui, F. X. Girod, Y. Ilieva, K. L. Giovanetti, Michael Wood, D. Branford, P. Collins, D. Keller, M. Mirazita, E. Voutier, P. Khetarpal, G. Rosner, B. L. Berman, A. D'Angelo, S. S. Jawalkar, I. Niculescu, J. P. Ball, Y. Prok, M. Khandaker, C. Hanretty, D. S. Carman, J. W. Price, N. Hassall, R. A. Schumacher, S. Park, V. Mokeev, P. Rossi, T. A. Forest, S. Stepanyan, H. Moutarde, S. Strauch, P. Stoler, D. P. Watts, B. Dey, B. Moreno, K. Hicks, B. Vernarsky, K. Livingston, J. Zhang, R. Dickson, N. Guler, M. Y. Gabrielyan, H. Hakobyan, D. J. Tedeschi, V. Kuznetsov, S. Niccolai, E. Seder, M. Anghinolfi, H. Seraydaryan, Y. G. Sharabian, Martin K. Mayer, M. S. Saini, Barry Ritchie, J. T. Goetz, I. I. Strakovsky, A. Deur, W. K. Brooks, Kei Moriya, C. A. Meyer, K. P. Adhikari, Michael Vineyard, D. P. Weygand, and D. Doughty

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Meson, 010308 nuclear & particles physics, Hadron, Photon energy, Strangeness, 7. Clean energy, 01 natural sciences, Nuclear physics, Baryon, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Differential cross sections of the reaction γd → K+Σ–(p) have been measured with the CLAS detector at Jefferson Lab using incident photons with energies between 1.1 and 3.6 GeV. This is the first complete set of strangeness photoproduction data on the neutron covering a broad angular range. At energies close to threshold and up to Eγ ~ 1.8 GeV, the shape of the angular distribution is suggestive of the presence of s -channel production mechanisms. For Eγ > 1.8 GeV, a clear forward peak appears and becomes more prominent as the photon energy increases, suggesting contributions from t-channel production mechanisms. Furthermore, these data can be used to constrain future analysis of this reaction.

Published
2010

22. The extraction of ϕ–N total cross section from d(γ,pK+K−)n

Author

K. Livingston, P. Eugenio, R. Dickson, M. Taiuti, D. Doughty, S. Park, D. Heddle, M. Battaglieri, R. A. Schumacher, S. Stepanyan, Avraham Klein, Michael Vineyard, S. Fegan, K. A. Griffioen, P. Collins, Y. Ilieva, H. Hakobyan, C. E. Hyde, C. Bookwalter, G. E. Dodge, H. Y. Lu, D. G. Ireland, W. Xu, V. Crede, Marco Ripani, F. Sabatié, R. G. Fersch, I. Niculescu, D. J. Tedeschi, M. J. Amaryan, D. Schott, P. L. Cole, Elton Smith, E. L. Isupov, M. E. McCracken, N. Dashyan, I. Bedlinskiy, Gerard Gilfoyle, V. P. Kubarovsky, Michael L. Williams, Tsutomu Mibe, N. Hassall, M. Bellis, S. L. Careccia, D. Sokhan, O. Pogorelko, C. Djalali, Z. W. Zhao, V. Kuznetsov, W. Gohn, A. D'Angelo, H. Baghdasaryan, M. Anghinolfi, Paolo Rossi, K. Hicks, D. Protopopescu, F. X. Girod, Sergey Kuleshov, K. L. Giovanetti, B. McKinnon, I. I. Strakovsky, Lorenzo Zana, S. Pozdniakov, Larry Weinstein, H. Seraydaryan, C. Hanretty, E. Wolin, Friedrich Klein, S. Niccolai, G. Rosner, W. J. Briscoe, Giovanni Ricco, R. Nasseripour, A. Fradi, E. Pasyuk, D. Keller, D. Branford, Brian Raue, J. W. Price, W. Chen, Y. G. Sharabian, J. P. Ball, J. R. Johnstone, L. Guo, C. Salgado, J. M. Laget, A. Deur, Xin Qian, D. S. Carman, Haiyan Gao, M. Ungaro, M. Guidal, M. Khandaker, V. Batourine, S. Tkachenko, S. Pisano, W. K. Brooks, S. Procureur, Martin K. Mayer, K. Joo, B. Zhao, M. S. Saini, A. I. Ostrovidov, K. Park, J. T. Goetz, M. Mirazita, M. Holtrop, A. Daniel, B. Morrison, K. Kramer, Michael Wood, K. Hafidi, Volker D. Burkert, A. S. Biselli, Kei Moriya, C. A. Meyer, J. Zhang, P. Nadel-Turonski, S. S. Jawalkar, E. Golovatch, R. Dupre, G. V. Fedotov, S. Dhamija, R. W. Gothe, S. Strauch, D. P. Watts, K. P. Adhikari, M. Y. Gabrielyan, D. P. Weygand, Barry Ritchie, B. Dey, M. Osipenko, D. Martinez, V. Mokeev, W. Kim, G. Niculescu, P. Khetarpal, C. S. Nepali, R. De Vita, T. Mineeva, S. Anefalos Pereira, E. De Sanctis, D. I. Sober, E. Munevar, B. S. Ishkhanov, and M. R. Niroula

Subjects
Baryon, Nuclear reaction, Physics, Nuclear and High Energy Physics, Cross section (physics), Meson, Deuterium, Proton, Hadron, Analytical chemistry, Atomic physics, Nucleon
Abstract

We report on the first measurement of the differential cross section of ϕ-meson photoproduction for the d ( γ , p K + K − ) n exclusive reaction channel. The experiment was performed using a tagged-photon beam and the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. A combined analysis using data from the d ( γ , p K + K − ) n channel and those from a previous publication on coherent ϕ production on the deuteron has been carried out to extract the ϕ − N total cross section, σ ϕ N . The extracted ϕ − N total cross section favors a value above 20 mb. This value is larger than the value extracted using vector-meson dominance models for ϕ photoproduction on the proton.

Published
2009

23. Moments of the spin structure functions g1p and g1d for 0.05<Q2<3.0 GeV2

Author

R. A. Schumacher, G. V. O'Rielly, C. D. Keith, Cynthia Marie Hadjidakis, Z. W. Zhao, Chaden Djalali, D. G. Jenkins, Michael Dugger, S. Tkachenko, H. O. Funsten, A. I. Ostrovidov, A. C S Lima, S. Bültmann, L. Morand, M. R. Niroula, T. A. Forest, D. G. Ireland, G. Asryan, Volker D. Burkert, A. S. Biselli, J. Pierce, Elton Smith, M. J. Amaryan, M. MacCormick, O. P. Dzyubak, R. A. Niyazov, I. Hleiqawi, S. L. Careccia, Larry Weinstein, Avraham Klein, E. Golovatch, H. G. Juengst, K. Moriya, Daniel S. Carman, J. Kuhn, Philip L. Cole, S. McAleer, H. Hakobyan, S. Anefalos Pereira, P. D. Rubin, L. Blaszczyk, P. Corvisiero, Y. G. Sharabian, A. Fradi, L. Cheng, G. Audit, A.V. Stavinsky, C. E. Hyde-Wright, F. Sabatié, Nikolay Shvedunov, D. Heddle, P. Stoler, Friedrich Klein, J. P. Cummings, R. De Vita, N. Markov, V. Sapunenko, C. Salgado, Dinko Pocanic, L. Elouadrhiri, N. Kalantarians, S. Stepanyan, K. S. Egiyan, R. C. Minehart, C. A. Meyer, J. Ball, M. Taiuti, S. E. Kuhn, I. I. Strakovsky, M. Bektasoglu, M. Kossov, K. Mikhailov, K.H. Hicks, R. J. Feuerbach, G. V. Fedotov, M. Nozar, A. Deur, I. Popa, V. Crede, J. W. Price, Shifeng Chen, M. Anghinolfi, Laird Kramer, D. P. Watts, H. Egiyan, G. Gavalian, John A. Mueller, L. Casey, B. L. Berman, P. Mattione, B. B. Niczyporuk, G. Rosner, N. Benmouna, N. Pivnyuk, Kwangsoo Kim, J. T. Goetz, M. Mirazita, G. Riccardi, J. R. Calarco, R. A. Miskimen, B. A. Raue, B. McKinnon, W. J. Briscoe, L. M. Qin, R. G. Fersh, P. Eugenio, J. Langheinrich, C. Butuceanu, C. Hanretty, S. S. Stepanyan, E. Pasyuk, S. A. Philips, M. Ripani, G. Ricco, S. A. Morrow, C. Paterson, Y. Ilieva, Michael Vineyard, Victor Mokeev, M. Klusman, B. M. Preedom, D. Branford, P. Collins, B. Moreno, J. R. Johnstone, Lorenzo Zana, J. P. Santoro, Tsutomu Mibe, Gerald Feldman, J. M. Laget, L. Todor, D. Protopopescu, K. L. Giovanetti, S. V. Kuleshov, C. Marchand, S. Pozdniakov, M. Garçon, M. L. Seely, Ji Li, D. J. Tedeschi, G. E. Dodge, H. Y. Lu, J. Lachniet, I. Bedlinskiy, Marco A. Huertas, A. Tkabladze, M. D. Mestayer, E. L. Isupov, P. V. Degtyarenko, D. Rowntree, K. Livingston, Michael L. Williams, M. Holtrop, R. Suleiman, V. Kuznetsov, D. S. Dale, J. Zhang, S. Boiarinov, D. I. Sober, Gerard Gilfoyle, F. X. Girod, G. S. Mutchler, N. A. Baltzell, I. Niculescu, D. Sokhan, J. Salamanca, K. A. Griffioen, D. Lawrence, M. Guillo, N. Guler, R. De Masi, L. El Fassi, J. W C McNabb, Sylvain Bouchigny, H. Denizli, M. Guidal, M. Battaglieri, J. Hardie, S. Strauch, J. D. Kellie, Z. Krahn, R. Nasseripour, S. Barrow, P. Rossi, R. Dickson, N. Baillie, D. Doughty, V. Gyurjyan, R. Bradford, K. Lukashin, B. E. Stokes, G. S. Adams, H. Bagdasaryan, P. Nadel-Turonski, A. V. Skabelin, K. Joo, A. Cazes, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, L. Guo, M. Ungaro, D. P. Weygand, E. Wolin, N. Hassall, M. Bellis, D. G. Crabb, J. Yun, D. Cords, P. Bosted, A. Yegneswaran, N. Dashyan, Y. Prok, Barry Ritchie, E. De Sanctis, H. S. Jo, S. Niccolai, R. Fatemi, A. V. Vlassov, P. Coltharp, R. W. Gothe, M. M. Ito, K. Y. Kim, M. Osipenko, K. Beard, L. C. Smith, E. Munevar, Kalvir S. Dhuga, B. S. Ishkhanov, O. Pogorelko, M. Khandaker, B. Zhao, F. W. Hersman, W. Kim, G. Niculescu, N. Gevorgyan, L. C. Dennis, B. E. Bonner, H. Avakian, D. Sharov, S. A. Dytman, W. K. Brooks, K. Park, V. P. Kubarovsky, J. Shaw, Michael Wood, K. Hafidi, and V. S. Serov

Subjects
Physics, Nuclear and High Energy Physics, Chiral perturbation theory, Heavy baryon chiral perturbation theory, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, 01 natural sciences, Baryon, Nuclear physics, Polarizability, 0103 physical sciences, Sum rule in quantum mechanics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The spin structure functions g 1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q 2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH3 and ND3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 Q 2 5 GeV 2 and W 3 GeV . The first moments of g 1 for the proton and deuteron are presented – both have a negative slope at low Q 2 , as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ 0 p is also reported. This quantity shows strong Q 2 dependence at low Q 2 . Our analysis of the Q 2 evolution of the first moment of g 1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ 0 p data and Chiral Perturbation calculations for γ 0 p , even at the lowest Q 2 .

Published
2009

24. Exclusive ρ0 electroproduction on the proton at CLAS

Author

J. Langheinrich, S. S. Stepanyan, E. Pasyuk, S. A. Philips, N. Dashyan, V. Sapunenko, G. Ricco, Alexei V. Klimenko, N. A. Baltzell, C. Salgado, Dinko Pocanic, Barry Ritchie, H. Denizli, A. V. Skabelin, K. A. Griffioen, B. Zhao, V. Gyurjyan, A. I. Ostrovidov, R. Fatemi, K. Park, S. E. Kuhn, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, C. A. Meyer, H. G. Juengst, B. E. Stokes, G. S. Adams, G. V. Fedotov, V. P. Kubarovsky, J. Zhang, P. Eugenio, K. P. Adhikari, A. V. Vlassov, D. P. Weygand, G. E. Dodge, H. Y. Lu, M. J. Amaryan, G. V. O'Rielly, S. Niccolai, Z. W. Zhao, V. Mokeev, Y. Ilieva, Ji Li, D. G. Jenkins, C. Tur, Gerard Gilfoyle, Elton Smith, H. Hakobyan, A.V. Stavinsky, J. D. Kellie, M. Guidal, M. MacCormick, I. Hleiqawi, S. L. Careccia, R. De Vita, Friedrich Klein, Brian Raue, P. V. Degtyarenko, M. D. Mestayer, J. P. Didelez, R. Nasseripour, L. Todor, F. W. Hersman, P. Coltharp, E. L. Isupov, J. P. Cummings, W. Gohn, S. A. Morrow, S. McAleer, M. Anghinolfi, P. Nadel-Turonski, D. Sokhan, D. Protopopescu, D. J. Tedeschi, M. Holtrop, Michael L. Williams, P. Collins, K. L. Giovanetti, I. Niculescu, F. X. Girod, L. Blaszczyk, B. Carnahan, James Mueller, D. Lawrence, R. G. Fersch, R. A. Miskimen, B. McKinnon, S. Pozdniakov, M. Garçon, J. J. Melone, M. M. Ito, S. Boiarinov, Larry Weinstein, L. Zana, P. D. Rubin, R. De Masi, D. Keller, I. Bedlinskiy, B. M. Preedom, S. Anefalos Pereira, D. Schott, Y. G. Sharabian, R. A. Schumacher, P. L. Cole, M. Yurov, M. Taiuti, S. Mehrabyan, D. Branford, L. C. Smith, E. Munevar, G. S. Mutchler, B. S. Ishkhanov, Michael Wood, K. Hafidi, L. Graham, M. Kossov, M. E. McCracken, C. I O Gordon, J. M. Laget, V. Kuznetsov, J. Kuhn, E. Hourany, M. Khandaker, V. S. Serov, L. C. Dennis, B. E. Bonner, J. W. Price, Tsutomu Mibe, S. Bültmann, G. Audit, Shifeng Chen, C. Bookwalter, N. Gevorgyan, M. Osipenko, C. E. Hyde-Wright, J. P. Santoro, H. S. Jo, H. Avakian, L. Morand, I. Popa, D. Sharov, T. A. Forest, G. Riccardi, M. R. Niroula, E. De Sanctis, O. Pogorelko, S. Stepanyan, P. Mattione, C. Butuceanu, M. S. Saini, D. Doughty, J. Pierce, M. Ripani, B. L. Berman, Avraham Klein, L. M. Qin, M. Aghasyan, E. Wolin, Sergey Kuleshov, W. J. Briscoe, D. Heddle, J. T. Goetz, D. I. Sober, Kalvir S. Dhuga, M. Bektasoglu, S. A. Dytman, S. Dhamija, M. Nozar, E. Polli, M. Mirazita, C. Paterson, J. P. Ball, R. W. Gothe, Y. Prok, B. Moreno, W. Kim, J. Hardie, Hall Crannell, D. S. Carman, K. Livingston, G. Rosner, C. Marchand, G. Niculescu, D. S. Dale, N. Baillie, S. Park, Sylvain Bouchigny, J. Lachniet, A. Tkabladze, D. G. Crabb, R. Dickson, Michael Vineyard, D. G. Ireland, V. Crede, J. R. Calarco, P. Khetarpal, N. Guler, J. Salamanca, L. El Fassi, J. W C McNabb, S. Barrow, P. Rossi, L. Casey, H. Bagdasaryan, Volker D. Burkert, A. S. Biselli, B. B. Niczyporuk, N. Pivnyuk, P. Stoler, C. Hanretty, Laird Kramer, J. R. Johnstone, L. Guo, M. Ungaro, A. Fradi, K. Joo, D. Cords, N. Markov, A. Yegneswaran, K. Hicks, M. Battaglieri, R. Bradford, K. S. Egiyan, A. Cazes, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, N. Hassall, M. Bellis, K. Mikhailov, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, S. Strauch, D. P. Watts, H. Egiyan, I. I. Strakovsky, A. Deur, W. K. Brooks, R. J. Feuerbach, Cynthia Marie Hadjidakis, M. Guillo, Chaden Djalali, Michael Dugger, L. Cheng, F. Sabatié, Nikolay Shvedunov, N. Kalantarians, G. Gavalian, S. Tkachenko, and N. Benmouna

Subjects
Quark, Physics, REPRESENTATION, Nuclear and High Energy Physics, Particle physics, Valence (chemistry), Proton, Hadron, Parton, VECTOR-MESON ELECTROPRODUCTION, Approx, PHOTONS, QCD, EVOLUTION, High Energy Physics - Experiment, Regge theory, Nuclear physics, Scattering amplitude, GENERALIZED PARTON DISTRIBUTIONS, VIRTUAL COMPTON-SCATTERING, VECTOR-MESON ELECTROPRODUCTION, LARGE MOMENTUM-TRANSFER, DIFFRACTIVE PRODUCTION, PHOTOPRODUCTION, PHOTONS, QCD, REPRESENTATION, EVOLUTION, LARGE MOMENTUM-TRANSFER, GENERALIZED PARTON DISTRIBUTIONS, DIFFRACTIVE PRODUCTION, PHOTOPRODUCTION, Nuclear Experiment, VIRTUAL COMPTON-SCATTERING
Abstract

The $e p\to e^\prime p \rho^0$ reaction has been measured, using the 5.754 GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross sections are presented. The $W$, $Q^2$ and $t$ dependences of the cross section are compared to theoretical calculations based on $t$-channel meson-exchange Regge theory on the one hand and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the $\approx$ 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present., Comment: 29 pages, 29 figures

Published
2008

25. Status of the MAJORANA DEMONSTRATOR: A Search for Neutrinoless Double-Beta Decay

Author

Kai Vetter, G. K. Giovanetti, Brian D. LaFerriere, M. P. Green, J. Rager, I. S. Guinn, Howe, D. Byram, V. B. Brudanin, H. Ejiri, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, Yuen-Dat Chan, T. Gilliss, A. S. Barabash, B. R. Jasinski, J. F. Wilkerson, F. E. Bertrand, R. D. Martin, E. Yakushev, I. J. Arnquist, N. Snyder, E. Romero-Romero, R. G. H. Robertson, Keith Rielage, Richard T. Kouzes, B. R. White, S. J. Meijer, C. D. Christofferson, M. F. Kidd, W. Xu, C. O'Shaughnessy, J. E. Trimble, Vladimir Yumatov, Stanley M. Howard, J. Gruszko, B. Shanks, V. E. Guiseppe, S. Mertens, C. Wiseman, M. Buuck, A. W. Bradley, F. T. Avignone, C. X. Baldenegro-Barrera, R. L. Varner, Eric W. Hoppe, Jonathan D. Leon, C.-H. Yu, A. Galindo-Uribarri, Reyco Henning, S. Vasilyev, D. J. Tedeschi, N. Abgrall, J. MacMullin, C. Cuesta, K. Vorren, M. Shirchenko, John L. Orrell, K. J. Keeter, I. Zhitnikov, Matthew Busch, A. S. Caldwell, J. Goett, S. I. Konovalov, Yu. Efremenko, S. R. Elliott, and D. C. Radford

Subjects
Physics, MAJORANA, Particle physics, Double beta decay
Published
2015

26. The Majorana Demonstrator: A Search for Neutrinoless Double-beta Decay of 76Ge

Author

F. T. Avignone, R. L. Varner, Reyco Henning, C. Wiseman, A. S. Caldwell, J. Gruszko, K. Vorren, K. J. Keeter, C.-H. Yu, M. P. Green, D. C. Radford, M. C. Ronquest, J. MacMullin, Yuen-Dat Chan, Susanne Mertens, Brian D. LaFerriere, H. Ejiri, Yu. Efremenko, R. D. Martin, D. J. Tedeschi, E. Romero-Romero, J. E. Trimble, S. I. Konovalov, Eric W. Hoppe, Vladimir Yumatov, Stanley M. Howard, S. J. Meijer, M. A. Howe, M. F. Kidd, Matthew Busch, C. Cuesta, J. Goett, R. G. H. Robertson, E. Yakushev, M. Shirchenko, John L. Orrell, V. B. Brudanin, C. D. Christofferson, G. K. Giovanetti, M. Buuck, N. Snyder, Nicole R. Overman, F. E. Bertrand, Keith Rielage, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, B. Shanks, V. E. Guiseppe, A. S. Barabash, B. R. Jasinski, J. F. Wilkerson, B. R. White, A. Galindo-Uribarri, J. Rager, S. Vasilyev, W. Xu, N. Abgrall, S. R. Elliott, C.M. O'Shaughnessy, Richard T. Kouzes, Kai Vetter, D. Byram, I. S. Guinn, and Jonathan D. Leon

Subjects
Physics, History, Antiparticle, Particle physics, Physics - Instrumentation and Detectors, High Energy Physics::Phenomenology, FOS: Physical sciences, Fermion, Electron, Instrumentation and Detectors (physics.ins-det), Lepton number, Computer Science Applications, Education, MAJORANA, Double beta decay, Neutron, High Energy Physics::Experiment, Neutrino, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Neutrinoless double-beta decay is a hypothesized process where in some even-even nuclei it might be possible for two neutrons to simultaneously decay into two protons and two electrons without emitting neutrinos. This is possible only if neutrinos are Majorana particles, i.e. fermions that are their own antiparticles. Neutrinos being Majorana particles would explicitly violate lepton number conservation, and might play a role in the matter-antimatter asymmetry in the universe. The observation of neutrinoless double-beta decay would also provide complementary information related to neutrino masses. The Majorana Collaboration is constructing the Majorana Demonstrator, a 40-kg modular germanium detector array, to search for the Neutrinoless double-beta decay of 76Ge and to demonstrate a background rate at or below 3 counts/(ROI-t-y) in the 4 keV region of interest (ROI) around the 2039 keV Q-value for 76Ge Neutrinoless double-beta decay. In this paper, we discuss the physics of neutrinoless double beta decay and then focus on the Majorana Demonstrator, including its design and approach to achieve ultra-low backgrounds and the status of the experiment., Comment: Published Version. 10 pages, 6 figures, proceedings for the 2nd Workshop on Germanium Detectors and Technologies, 14-17 September 2014, at the University of South Dakota, Vermillion, SD

Published
2015
Full Text
View/download PDF

27. MAJORANA Collaboration's Experience with Germanium Detectors

Author

A. Galindo-Uribarri, Yuen-Dat Chan, S. Vasilyev, Alan Poon, N. Abgrall, Anne-Marie Suriano, J. A. Detwiler, R. D. Martin, J. Gruszko, Yu. Efremenko, J. Goett, J. F. Wilkerson, R. G. H. Robertson, M. A. Howe, E. Romero-Romero, D. J. Tedeschi, C.M. O'Shaughnessy, B. R. White, Vladimir Yumatov, Stanley M. Howard, Jonathan D. Leon, V. B. Brudanin, I. S. Guinn, F. T. Avignone, R. L. Varner, B. R. Jasinski, M. P. Green, M. Buuck, C. Wiseman, Nicole R. Overman, Reyco Henning, Eric W. Hoppe, C. Cuesta, J. Rager, D. Byram, Matthew Busch, C.-H. Yu, H. Ejiri, A. S. Barabash, Susanne Mertens, K. J. Keeter, B. Shanks, V. E. Guiseppe, S. R. Elliott, Brian D. LaFerriere, D. C. Radford, A. S. Caldwell, Keith Rielage, M. Shirchenko, John L. Orrell, J. MacMullin, Kai Vetter, S. J. Meijer, C. D. Christofferson, F. E. Bertrand, K. Vorren, M. F. Kidd, E. Yakushev, W. Xu, G. K. Giovanetti, J. E. Trimble, Richard T. Kouzes, M. C. Ronquest, S. I. Konovalov, and N. Snyder

Subjects
Physics, History, Physics - Instrumentation and Detectors, Detector, chemistry.chemical_element, FOS: Physical sciences, Germanium, Instrumentation and Detectors (physics.ins-det), Engineering physics, Computer Science Applications, Education, Characterization (materials science), Point contact, MAJORANA, chemistry, Germanium crystal, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The goal of the \textsc{Majorana} \textsc{Demonstrator} project is to search for 0$\nu\beta\beta$ decay in $^{76}\mathrm{Ge}$. Of all candidate isotopes for 0$\nu\beta\beta$, $^{76}\mathrm{Ge}$ has some of the most favorable characteristics. Germanium detectors are a well established technology, and in searches for 0$\nu\beta\beta$, the high purity germanium crystal acts simultaneously as source and detector. Furthermore, p-type germanium detectors provide excellent energy resolution and a specially designed point contact geometry allows for sensitive pulse shape discrimination. This paper will summarize the experiences the \textsc{Majorana} collaboration made with enriched germanium detectors manufactured by ORTEC$^{\circledR}$. The process from production, to characterization and integration in \textsc{Majorana} mounting structure will be described. A summary of the performance of all enriched germanium detectors will be given., Comment: 10 pages, 8 figures

Published
2015
Full Text
View/download PDF

28. Low background signal readout electronics for the MAJORANA DEMONSTRATOR

Author

I. J. Arnquist, N. Snyder, T. Gilliss, R. D. Martin, M. Shirchenko, John L. Orrell, R. G. H. Robertson, Eric W. Hoppe, J. MacMullin, C. D. Christofferson, Brian D. LaFerriere, F. T. Avignone, R. L. Varner, Reyco Henning, M. F. Kidd, C. X. Baldenegro-Barrera, D. J. Tedeschi, W. Xu, J. Goett, A. Galindo-Uribarri, B. Shanks, E. Romero-Romero, V. E. Guiseppe, C.-H. Yu, S. Vasilyev, D. C. Radford, C. Wiseman, N. Abgrall, C. Cuesta, Keith Rielage, M. Buuck, K. J. Keeter, J. E. Trimble, Yuen-Dat Chan, B. R. Jasinski, J. F. Wilkerson, V. B. Brudanin, F. E. Bertrand, A. W. Bradley, S. I. Konovalov, M. A. Howe, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, B. R. White, C. O'Shaughnessy, Vladimir Yumatov, Stanley M. Howard, J. Rager, Yu. Efremenko, S. R. Elliott, Richard T. Kouzes, Kai Vetter, Jonathan D. Leon, A. S. Barabash, I. S. Guinn, J. Gruszko, D. Byram, S. Mertens, M. P. Green, H. Ejiri, I. Zhitnikov, Matthew Busch, K. Vorren, A. S. Caldwell, G. K. Giovanetti, S. J. Meijer, and E. Yakushev

Subjects
Physics, Physics - Instrumentation and Detectors, Detector, FOS: Physical sciences, Readout electronics, Instrumentation and Detectors (physics.ins-det), Signal, Semiconductor detector, Nuclear physics, MAJORANA, Double beta decay, Nuclear Experiment (nucl-ex), Hpge detector, Nuclear Experiment, Scale down
Abstract

The MAJORANA Collaboration will seek neutrinoless double beta decay (0nbb) in 76Ge using isotopically enriched p-type point contact (PPC) high purity Germanium (HPGe) detectors. A tonne-scale array of HPGe detectors would require background levels below 1 count/ROI-tonne-year in the 4 keV region of interest (ROI) around the 2039 keV Q-value of the decay. In order to demonstrate the feasibility of such an experiment, the MAJORANA DEMONSTRATOR, a 40 kg HPGe detector array, is being constructed with a background goal of, 6 pages, 7 figures, 2 tables. LRT 2015 Proceedings

Published
2015

29. Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon

Author

L. Elouadrhiri, R. A. Miskimen, M. Khandaker, B. McKinnon, G. Rosner, I. I. Strakovsky, R. W. Gothe, M. Bellis, D. Branford, P. Rossi, K. Y. Kim, A. Deur, S. V. Kuleshov, H. G. Juengst, K. S. Egiyan, P. V. Degtyarenko, P. Dragovitsch, M. Battaglieri, M. Nozar, D. J. Tedeschi, M. Taiuti, I. Bedlinskiy, L. Todor, J. P. Cummings, D. Doughty, F. X. Girod, S. Niccolai, D. Protopopescu, Laird Kramer, J. Hardie, V. Gyurjyan, R. De Masi, B. E. Stokes, F. Ronchetti, R. A. Schumacher, P. Corvisiero, V. P. Kubarovsky, G. S. Adams, D. Heddle, Brian Raue, M. Mirazita, G. Ricco, Dinko Pocanic, L. C. Smith, S. Tkachenko, R. Bradford, K. Lukashin, Y. G. Sharabian, O. Pogorelko, E. Wolin, S. McAleer, S. E. Kuhn, V. Sapunenko, B. S. Ishkhanov, Ji Li, Jean Laget, N. Benmouna, N. Pivnyuk, Rakhsha Nasseripour, B. Carnahan, L. C. Dennis, B. E. Bonner, M. Guillo, C. Tur, J. Napolitano, A. I. Ostrovidov, R. Fatemi, A. C S Lima, Gerard Gilfoyle, D. Cords, Marco A. Huertas, H. Avakian, E. S. Smith, K. Park, A. V. Vlassov, D. G. Ireland, M. R. Niroula, V. Batourine, B. Zhao, Y. Ilieva, E. L. Isupov, R. Suleiman, I. Hleiqawi, L. Guo, S. Bültmann, Volker D. Burkert, A. S. Biselli, H. S. Jo, E. Golovatch, Michael L. Williams, P. Bosted, S. L. Careccia, James Mueller, G. S. Mutchler, R. DeVita, M. Ripani, S. A. Morrow, Atilla Gonenc, M. MacCormick, C. Djalali, F. W. Hersman, T. A. Forest, M. Anghinolfi, P. D. Rubin, S. Stepanyan, A. Cazes, G. Gavalian, J. W. Price, S. Boiarinov, Maryam Moteabbed, B. M. Preedom, N. A. Baltzell, Sylvain Bouchigny, J. P. Ball, Y. Prok, K. L. Giovanetti, Michael Dugger, A. Yegneswaran, Shifeng Chen, K. V. Dharmawardane, J. Pierce, M. Kossov, Avraham Klein, Jens H. Kuhn, A. Stavinsky, Larry Weinstein, P. Ambrozewicz, E. Pasyuk, L. M. Qin, K. A. Griffioen, H. O. Funsten, P. Coltharp, U. Thoma, C. Keith, Lorenzo Zana, D. P. Weygand, S. A. Dytman, Hall Crannell, M. M. Ito, N. Baillie, J. T. Goetz, G. V. O'Rielly, C. Paterson, M. Klusman, K. Livingston, V. Crede, Z. W. Zhao, Frank Klein, D. G. Crabb, J. R. Calarco, S. Strauch, D. G. Jenkins, C. Salgado, J. D. Kellie, G. E. Dodge, S. Pozdniakov, N. Guler, J. W C McNabb, M. D. Mestayer, I. Niculescu, Nikolay Shvedunov, D. Lawrence, M. Guidal, D. I. Sober, S. S. Stepanyan, M. Osipenko, S. Barrow, F. Sabatié, Michael Vineyard, K. Beard, M. Garçon, B. Mecking, G. Riccardi, J. Shaw, C. Butuceanu, Michael Wood, W. K. Brooks, K. Hafidi, V. S. Serov, Victor Mokeev, M. Ungaro, K. Joo, J. Yun, J. P. Santoro, Roy Thompson, K. Kim, J. J. Manak, P. Eugenio, J. Zhang, H. Bagdasaryan, P. Collins, Daniel S. Carman, C. Hadjidakis, C. E. Hyde-Wright, M. Bektasoglu, J. Langheinrich, S. A. Philips, G. Niculescu, M. Holtrop, Hong Lu, P. L. Cole, P. Nadel-Turonski, Tsutomu Mibe, B. B. Niczyporuk, J. Lachniet, A. Tkabladze, D. Rowntree, R. S. Hakobyan, J. Donnelly, O. P. Dzyubak, R. A. Niyazov, R. J. Feuerbach, L. Morand, P. Stoler, E. De Sanctis, K. Hicks, W. Kim, Susan Taylor, K. Mikhailov, H. Egiyan, N. Markov, Barry Ritchie, G. Asryan, H. Denizli, A. V. Skabelin, R. C. Minehart, C. A. Meyer, G. V. Fedotov, and E. Polli

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Momentum transfer, Quark model, Parton, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, Invariant mass, 010306 general physics, Nucleon, media_common
Abstract

We report results for the virtual photon asymmetry A{sub 1} on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton ({sup 15}NH{sub 3}) and deuteron ({sup 15}ND{sub 3}) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present paper, we concentrate on our results for A{sub 1}(x,Q{sup 2}) and the related ratio g{sub 1}/F{sub 1}(x,Q{sup 2}) in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer Q{sup 2} from 0.05 to 5.0 GeV{sup 2} and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong Q{sup 2}--dependence of A{sub 1}(x,Q{sup 2}) for W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A{sub 1}(x,Q{sup 2}) is not strictly Q{sup 2}--independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU(6)-symmetric quark model expectation for both the proton and the deuteron whilemore » being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions.« less

Published
2006

30. A pair polarimeter for linearly polarized high energy photons

Author

T. Nakano, Vladimir Nelyubin, R. G. T. Zegers, P. Weilhammer, Tomoaki Hotta, G. V. O'Rielly, A. Rudge, Tetsuhiko Yorita, Bogdan Wojtsekhowski, Branislav Vlahovic, Tsutomu Mibe, H. Kohri, T. Matsumara, D. Abbott, D. J. Tedeschi, J. Asai, Michael Wood, M. Khadaker, C.deJager, and Gerald Feldman

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Photon, Other Fields of Physics, FOS: Physical sciences, 01 natural sciences, 010305 fluids & plasmas, law.invention, Quality (physics), Optics, Physics - Space Physics, law, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Physics, 010308 nuclear & particles physics, business.industry, Linear polarization, Astrophysics::Instrumentation and Methods for Astrophysics, Bremsstrahlung, Polarimeter, Instrumentation and Detectors (physics.ins-det), Laser, Space Physics (physics.space-ph), Beamline, Physics::Accelerator Physics, High Energy Physics::Experiment, business, Beam (structure)
Abstract

A high quality beam of linearly polarized photons of several GeV will become available with the coherent bremsstrahlung technique at JLab. We have developed a polarimeter which requires about two meters of the beam line, has an analyzing power of 20% and an efficiency of 0.02%. The layout and first results of a polarimeter test on the laser back-scattering photon beam at SPring-8/LEPS are presented. A high quality beam of linearly polarized photons of several GeV will become available with the coherent bremsstrahlung technique at JLab. We have developed a polarimeter which requires about two meters of the beam line, has an analyzing power of 20% and an efficiency of 0.02%. The layout and first results of a polarimeter test on the laser back-scattering photon beam at SPring-8/LEPS are presented.

Published
2004

31. Theep→e′pηReaction at and above theS11(1535)Baryon Resonance

Author

M. J. Amaryan, M. Taiuti, S. K. Matthews, J. Ficenec, Gyurjyan, W. Kim, A. Longhi, R. A. Schumacher, B. E. Bonner, L. Elouadrhiri, A. P. Freyberger, R. Magahiz, Robert E. Welsh, S. Dytman, S. Whisnant, B. M. Preedom, Federico Ronchetti, R. J. Feuerbach, K. L. Giovanetti, B. Asavapibhop, Michael Dugger, Shalev Gilad, De Sanctis E, A. V. Vlassov, G. Ricco, J. R. Kane, H. Avakian, Philip L. Cole, J. P. Cummings, G. S. Adams, Larry Weinstein, R. A. Miskimen, K. Joo, J. Shaw, R. W. Major, Moshe Gai, M. Kossov, W. J. Briscoe, D. Rowntree, D. Doughty, K. Beard, W. K. Brooks, Friedrich Klein, R. S. Hicks, Brian Raue, Kevin Fissum, Kalvir S. Dhuga, Barry Ritchie, A. Coleman, K. A. Griffioen, M. M. Ito, G. Riccardi, L. M. Qin, J. J. Manak, M. Mirazita, J. M. Laget, C. E. Hyde-Wright, J. W C McNabb, M. S. Ohandjanyan, D. Heddle, C. Salgado, H. R. Weller, Roy Thompson, Curtis Smith, D. P. Weygand, Herbert O. Funsten, S. A. Philips, Patrick Girard, Y. Kuang, H. Egiyan, M. Witkowski, Bernhard Mecking, Mestayer, A. J. Sarty, Jing Zhao, S. Stepanyan, De Vita R, D. G. Jenkins, C. Djalali, Z. L. Zhou, M. Lucas, Airton Deppman, D. I. Sober, A. Shafi, D. Hancock, Avraham Klein, Leskin Ga, M. Battaglieri, S. McAleer, William Bertozzi, E. Polli, E. Anciant, L. Farhi, G. E. Dodge, Daniel S. Carman, V. B. Gavrilov, O. Pogorelko, A. K. Opper, G. Audit, J. W. Price, M. Khandaker, E. Wolin, P. V. Degtyarenko, Y. Patois, Gerard Gilfoyle, Dinko Pocanic, L.C. Dennis, K. Loukachine, N. Pivnyuk, M. Bektasoglu, S. E. Kuhn, S. M. Shuvalov, D. Lawrence, M. Eckhause, J. Napolitano, M. Ripani, M. Guillo, Jochen Heisenberg, Y. V. Efremenko, Volker D. Burkert, M. Sanzone, J. Connelly, Donal Day, M. Sargsyan, G. A. Peterson, M. Guidal, A. V. Skabelin, J. Yun, D. Cords, A. Yegneswaran, A. S. Biselli, Elton Smith, S. Barrow, M. Holtrop, Thomas E. Smith, G. S. Mutchler, M. Anghinolfi, Hall Crannell, D. G. Crabb, James Mueller, S. Taylor, P. D. Rubin, G. Capitani, F. Roudot, D. J. Tedeschi, Y. G. Sharabian, M. Spraker, Sapunenko, R. C. Minehart, M. Klusman, Nicola Bianchi, S. Boiarinov, C. A. Meyer, J. S. McCarthy, B. Carnahan, Thierry Auger, A. R. Reolon, Michael Vineyard, C. Marchand, P. Rossi, P. Dragovitsch, F. W. Hersman, R. A. Demirchyan, T. Y. Tung, J. Hardie, K. Y. Kim, Muccifora, R. A. Niyazov, John T. O'Brien, P. Corvisiero, K. S. Egiyan, Calarco, P. Stoler, and K. Hicks

Subjects
Baryon, Physics, Nuclear physics, Particle physics, Photon, Amplitude, Angular distribution, Meson, Momentum transfer, General Physics and Astronomy, Resonance, Invariant (physics), Nuclear Experiment
Abstract

New cross sections for the reaction e p-->e p eta are reported for total center of mass energy W = 1.5--1.86 GeV and invariant momentum transfer Q2 = 0.25--1.5 (GeV/c)(2). This large kinematic range allows extraction of important new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. Newly observed structure at W approximately 1.65 GeV is shown to come from interference between S and P waves and can be interpreted with known resonances. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance.

Published
2001

32. The CLAS drift chamber system

Author

S. Dytman, Daniel S. Carman, G. Jacobs, S. Christo, S. E. Kuhn, R. Miskimen, M. Kossov, K.G. Vansyoc, J. W C McNabb, D. Tilles, C. Martin, W.S. Duncan, James Mueller, F. Roudot, R. A. Schumacher, R. A. Thompson, R. J. Feuerbach, G.R. Wilkin, Michael Vineyard, J. Yun, Avraham Klein, A. Yegneswaran, W. Tuzel, G. E. Dodge, F. Barbosa, B. B. Niczyporuk, V. Gyurjyan, R. W. Major, T. Dooling, M. D. Mestayer, B. A. Raue, B. Asavapibhop, R. Magahiz, Larry Weinstein, J.E. O'Meara, D. J. Tedeschi, P. Bonneau, C. E. Hyde-Wright, Friedrich Klein, R. S. Hicks, T McGuckin, J. Robb, K.H. Hicks, L. M. Qin, and Gerard Gilfoyle

Subjects
Physics, Nuclear and High Energy Physics, Toroid, Electromagnet, Spectrometer, business.industry, Superconducting magnet, Tracking (particle physics), Linear particle accelerator, Particle detector, law.invention, Nuclear physics, Optics, Planar, law, business, Instrumentation
Abstract

The CEBAF Large Acceptance Spectrometer at 12 GeV (CLAS12) is located in Hall B, one of the experimental halls at Jefferson Lab. The forward part of CLAS12 is built around a superconducting toroidal magnet. The six coils of the toroid divide the detector azimuthally into six sectors. Each sector contains three multi-layer drift chambers for reconstructing the trajectories of charged particles originating from a fixed target. Each of the 18 planar chambers has two “superlayers” of six layers each, with the wires in the two adjacent superlayers oriented at ± 6 ° stereo angles. Each layer has 112 hexagonal cells spanning a range from about 5 ° to 40 ° in polar angle. The six-layer structure provides redundancy in track segment finding and good tracking efficiency even in the presence of some individual wire inefficiency. The design, construction, operation, and calibration methods are described, and estimates of the efficiency and resolution are presented from in-beam measurements.

Published
2000

33. The region one drift chamber for the CLAS spectrometer

Author

R. Magahiz, S. Dytman, R. A. Schumacher, M. D. Mestayer, G.R. Wilkin, Daniel S. Carman, D. J. Tedeschi, R. A. Thompson, James Mueller, and R. A. Miskimen

Subjects
Physics, Nuclear and High Energy Physics, Toroid, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Detector, Mechanical components, Particle detector, Magnetic field, Nuclear magnetic resonance, Optics, Magnet, Measuring instrument, business, Instrumentation
Abstract

The Region One detector is the innermost of three nested drift chamber packages of the CLAS spectrometer at Jefferson Laboratory. This detector, with 7776 drift cells, was optimized for the CLAS toroidal magnet geometry, and consists of six wedge-shaped sectors integrated into a single unit. Each sector has thin and relatively weak aluminum endplates which support the large mechanical loads from the wire tensions and associated readout hardware. The unusual feature of the detector is its self-supporting design, wherein the wire tensions of neighboring sectors balance each other without the use of massive structural support. We discuss the design criteria, mechanical components, and assembly procedures.

Published
1998

34. Dependence ofp→p→→ppπ0near Threshold on the Spin of the Colliding Nucleons

Author

T. Wise, B. von Przewoski, M. Wolanski, Swapan K. Saha, F. Sperisen, Mario Dzemidzic, R. E. Pollock, H. O. Meyer, W. Haeberli, T. Rinckel, D. J. Tedeschi, J. Doskow, Frank Rathmann, W. W. Daehnick, J. Balewski, P. Thoerngren-Engblom, B. Lorentz, P. V. Pancella, Benjamin Schwartz, and R. W. Flammang

Subjects
Physics, Near threshold, Polarization observables, Pi, General Physics and Astronomy, Sigma, Atomic physics, Nucleon, Spin-½
Abstract

A polarized internal atomic-hydrogen target and a stored, polarized beam are used to measure the spin-dependent total cross section {Delta}{sigma}{sub T}thinsp/{sigma}{sub tot} for {rvec p}{rvec p}{r_arrow} pp{pi}{sup 0} , as well as the polar integrals of the spin correlation coefficient combination A{sub xx}{minus}A{sub yy} , and the analyzing power A{sub y} at four bombarding energies between 325 and 400thinspthinspMeV. This experiment is made possible by the use of a cooled beam in a storage ring. The polarization observables are used to study the contribution from individual partial waves. {copyright} {ital 1998} {ital The American Physical Society }

Published
1998

35. Analyzing powers and cross sections ofp→p→pnπ+near threshold

Author

W. W. Jacobs, P. V. Pancella, W. K. Brooks, R. W. Flammang, W. W. Daehnick, R. A. Thompson, J. G. Hardie, T. Rinckel, D. J. Tedeschi, E. J. Stephenson, C. C. Foster, S. A. Dytman, and T. Vrana

Subjects
Nuclear physics, Momentum, Physics, Nuclear and High Energy Physics, Cross section (physics), Near threshold, Pion, Order (ring theory), Atomic physics, Resonance (particle physics), Beam (structure)
Abstract

Analyzing powers for {rvec p}p{r_arrow}pn{pi}{sup +} were measured for the first time close to threshold at beam energies that yield maximum pion momentum fractions ({eta}{equivalent_to}p{sub c.m.}{sup max}/m{sub {pi}}c) of {eta}=0.22, 0.42, and 0.50, and enable a decomposition of the low order partial waves. Cross sections were measured at seven different beam energies with {eta}=0.07, 0.17, 0.22, 0.28, 0.34, 0.42, and 0.50. The analysis shows that pion s-wave channels dominate the reaction. The p-wave channel containing the {Delta} resonance contributes, at {eta}=0.22, less than one-tenth of the total cross section and less than one-third of the total cross section at {eta}=0.42 and 0.50. The nonresonant p-wave channel contributes less than 1{percent} of the cross section at these three energies. {copyright} {ital 1998} {ital The American Physical Society}

Published
1998

36. Analyzing powers in and determination of pion S and P wave amplitudes near threshold

Author

W. W. Jacobs, J. G. Hardie, W. W. Daehnick, D. J. Tedeschi, P. V. Pancella, C. C. Foster, R. W. Flammang, T. Rinckel, S. A. Dytman, T. Vrana, E. J. Stephenson, W. K. Brooks, and R. A. Thompson

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Near threshold, Pion, Amplitude, Partial wave analysis, P wave
Abstract

Analyzing powers were measured and used to quantify the observation that s-wave processes dominate near threshold. Values of Ay(θπ,φπ=0°) are presented for η values of 0.22, 0.42 and 0.50. Maximum analyzing powers AN0 are equal to −0.13, −0.24, and −0.28, respectively. A partial wave analysis, made possible by the new analyzing powers and available cross sections, indicates that the s-wave contribution to the cross section constitutes about 91% of the total cross section at η=0.22, or 300 MeV. It decreases to about 75% for η=0.5.

Published
1998

37. Measurement of γ→d→pnπ0at large nucleon momenta

Author

S.T. Thornton, R. A. Lindgren, A. M. Sandorfi, G. S. Adams, K. Vaziri, W. B. Clayton, C. Schaerf, L. C. Smith, E. J. Winhold, D. J. Tedeschi, R. M. Sealock, A. Caracappa, S. Hoblit, A. D'Angelo, T. Kobayashi, L. Miceli, O. C. Kistner, P. Stoler, C. E. Thorn, C. Ruth, C. S. Whisnant, H. Baghaei, and M. Khandaker

Subjects
Physics, Nuclear and High Energy Physics, Meson, Computer Science::Information Retrieval, Nuclear Theory, Hadron, Monte Carlo method, Photon energy, Baryon, Nuclear physics, Pion, Neutron, Nuclear Experiment, Nucleon
Abstract

Coincident protons and neutrons from the reaction [rvec ]gg[ital d][r arrow][ital pn][pi][sup 0] were measured at a photon energy of 290 MeV. Cross sections and beam asymmetries were extracted for nucleon momenta above the quasifree region for the first time. The measured cross sections are compared with the results of a cascade Monte Carlo calculation.

Published
1995

38. Exclusive Photodisintegration ofHe3with Polarized Photons

Author

G. Giordano, S.T. Thornton, R. A. Lindgren, G. Audit, M. A. Duval, G. S. Adams, O. C. Kistner, H. Baghaei, P. Stoler, E. J. Winhold, Murray Moinester, P. K. Teng, W. K. Mize, C. Ruth, C. Schaerf, D. J. Tedeschi, C. S. Whisnant, L. C. Smith, L. Miceli, R. M. Sealock, K. Vaziri, G. Matone, W. B. Clayton, S. Hoblit, A. M. Sandorfi, C. E. Thorn, J. M. Laget, A. Caracappa, and A. D'Angelo

Subjects
Nuclear reaction, Physics, Nuclear physics, Photon, Photodisintegration, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Neutron, Nuclear Experiment, Absorption (electromagnetic radiation), Nucleon
Abstract

The first measurement of exclusive photodisintegration of He-3 with polarized photons is reported. Cross sections and asymmetries for He-3(gamma over arrow pointing right, pn)p and He-3(gamma over arrow pointing right, pp)n at 235 less-than-or-equal-to E(gamma) less-than-or-equal-to 305 MeV are compared to a theoretical calculation which includes one-, two-, and three-nucleon photon absorption. Two-nucleon absorption dominates the pn data, but is suppressed in the pp data. The pp data require the inclusion of three-nucleon absorption to describe the cross section and beam asymmetry over all momenta.

Published
1994

39. First measurement of the reactionHe3(γ→,p)Xwith polarized photons

Author

J. M. Laget, D. J. Tedeschi, Murray Moinester, L. C. Smith, R. M. Sealock, K. Vaziri, A. M. Sandorfi, O. C. Kistner, M. A. Duval, P. Stoler, W. B. Clayton, C. S. Whisnant, E. J. Winhold, S. Hoblit, L. Miceli, S.T. Thornton, R. A. Lindgren, C. Ruth, G. Matone, H. Baghaei, W. K. Mize, C. Schaerf, P. K. Teng, C. E. Thorn, A. Caracappa, A. D'Angelo, G. S. Adams, and G. Giordano

Subjects
Nuclear reaction, Physics, Photon, Proton, Computer Science::Information Retrieval, media_common.quotation_subject, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Asymmetry, Baryon, Atomic physics, Nuclear Experiment, Nucleon, media_common
Abstract

The first measurement of the reaction [sup 3]He([rvec [gamma]],[ital p])[ital X] using linearly polarized photons is reported. Cross sections and beam-polarization asymmetries for [theta][sub [ital p]][sup lab]=60[degree]--100[degree] and [ital E][sub [gamma]]=195--304 MeV are compared with a microscopic calculation which includes one-, two-, and three-nucleon absorption mechanisms. One- and two-nucleon absorption alone fails to describe the data at low proton momenta. The inclusion of three-nucleon absorption significantly improves the comparison with the measured cross sections. However, some features of the asymmetry distributions are not explained.

Published
1994

40. Coherent photoproduction ofπ+fromHe3

Author

C. E. Hyde, H. Moutarde, K. L. Giovanetti, Larry Weinstein, William Brooks, P. Khetarpal, B. McKinnon, C. Djalali, E. S. Smith, B. Guegan, G. Rosner, K. A. Griffioen, S. Fegan, Barry Ritchie, W. J. Briscoe, E. Pasyuk, B. L. Berman, S. Park, R. W. Gothe, Y. Perrin, H. Y. Lu, D. Branford, Frank Klein, W. Gohn, Sergey Kuleshov, M. Mirazita, F. X. Girod, Dustin Keller, N. Dashyan, J. McAndrew, P. L. Cole, Z. W. Zhao, George Davey Smith, I. Niculescu, P. Collins, D. G. Ireland, V. Crede, K. Hafidi, A. Deur, Yordanka Ilieva, W. Tang, M. Taiuti, S. Strauch, C. E. Taylor, A. D'Angelo, R. A. Schumacher, M. Osipenko, B. Morrison, D. P. Weygand, L. Casey, V. Batourine, L. Graham, D. Adikaram, L. El Fassi, P. Stoler, G. Niculescu, I. J. D. MacGregor, V. P. Kubarovsky, A. M. Micherdzinska, F. Sabatié, B. Zhao, M. Holtrop, J. P. Ball, R. Dupre, M. Battaglieri, B. Dey, S. Stepanyan, A. Daniel, D. S. Carman, C. Hanretty, Diane Schott, E. Voutier, R. Suleiman, A. Kim, D. J. Tedeschi, A. I. Ostrovidov, I. Bedlinskiy, P. Konczykowski, Andreas Klein, S. Procureur, D. P. Watts, V. Kuznetsov, H. Egiyan, K. Park, E. Munevar, Pawel Nadel-Turonski, S. Niccolai, Rakhsha Nasseripour, M. H. Wood, R. Paremuzyan, A. Ni, Gerard Gilfoyle, Volker D. Burkert, A. S. Biselli, D. Sokhan, A. El Alaoui, B. Vernarsky, B. Moreno, K. Livingston, R. Dickson, A. Fradi, S. Pisano, D. Protopopescu, S. Pozdniakov, Nicholas Kvaltine, D. Doughty, D. Heddle, M. Khandaker, M. Gabrielyan, M. Anghinolfi, H. Seraydaryan, S. Tkachenko, Y. G. Sharabian, M. Ripani, Carlos A. Salgado, Paolo Rossi, Martin K. Mayer, Michael Paolone, M. S. Saini, J. T. Goetz, S. E. Kuhn, E. De Sanctis, D. I. Sober, R. De Vita, S. Anefalos Pereira, M. Ungaro, S. S. Stepanyan, J. W. Price, K. P. Adhikari, H. Hakobyan, K. Moriya, E. L. Isupov, Michael Vineyard, and W. Kim

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2011

41. Precise Extraction of the Induced Polarization in theHe4(e,e′p→)H3Reaction

Author

P. Solvignon, Michael Paolone, E. Khrosinkova, Alexandre Camsonne, R. A. Lindgren, D. J. Margaziotis, J. R. Vignote, J. Glister, A. Saha, B. Craver, B. L. Berman, Bumsung Lee, Ronald Gilman, D. J. Tedeschi, C. E. Keppel, S. Strauch, X. Zhan, J. P. Chen, A. J. Sarty, C. E. Hyde-Wright, F. R. Wesselmann, R. Michaels, E. Cisbani, O. Glamazdin, E. Piasetzky, L. G. Tang, B. Briscoe, S. Malace, F. Cusanno, V. Tvaskis, Ronald Ransome, Yujie Qiang, Andrew Puckett, Xin Qian, E. J. Brash, X. Jiang, Bogdan Wojtsekhowski, E. Chudakov, K. Park, J. Arrington, E. Kuchina, C. W. de Jager, I. Albayrak, F. Garibaldi, C. F. Perdrisat, G. J. Kumbartzki, M. E. Christy, V. A. Punjabi, D. G. Meekins, Rolf Ent, P. E. Ulmer, Yordanka Ilieva, E. Schulte, Douglas Higinbotham, M. K. Jones, J. M. Udías, Lubomir Pentchev, and R. Subedi

Subjects
Physics, Quantum electrodynamics, General Physics and Astronomy, Impulse (physics), Atomic physics, Polarization (waves), Nuclear matter, Induced polarization, Charge exchange
Abstract

We measured with unprecedented precision the induced polarization P(y) in (4)He(e,e'p)(3)H at Q(2)=0.8 and 1.3 (GeV/c)(2). The induced polarization is indicative of reaction-mechanism effects beyond the impulse approximation. Our results are in agreement with a relativistic distorted-wave impulse approximation calculation but are overestimated by a calculation with strong charge-exchange effects. Our data are used to constrain the strength of the spin-independent charge-exchange term in the latter calculation.

Published
2011

42. Near-threshold photoproduction of ϕ mesons from deuterium

Author

V. Mokeev, E. Seder, S. Fegan, A. El Alaoui, Y. Ilieva, D. G. Ireland, Z. W. Zhao, V. Crede, M. E. McCracken, Kei Moriya, C. A. Meyer, Barry Ritchie, Tsutomu Mibe, Friedrich Klein, K. P. Adhikari, D. P. Weygand, F. Sabatié, Nicholas Zachariou, S. Pisano, C. Bookwalter, W. Kim, E. De Sanctis, R. A. Schumacher, A. Kim, R. Paremuzyan, George Davey Smith, F. X. Girod, K. A. Griffioen, S. Dhamija, P. Eugenio, B. Moreno, L. Graham, Xin Qian, D. I. Sober, M. Taiuti, S. Strauch, J. Zhang, R. W. Gothe, G. Rosner, K. Livingston, A. D'Angelo, S. Stepanyan, Avraham Klein, A. Ni, M. Ripani, H. Egiyan, S. Tkachenko, N. Dashyan, Gerard Gilfoyle, J. W. Price, I. Niculescu, P. Collins, G. Ricco, S. Park, C. E. Taylor, N. Hassall, M. Bellis, D. Sokhan, M. Osipenko, Michael Vineyard, Sergey Kuleshov, D. Schott, P. Rossi, R. De Vita, D. Martinez, B. McKinnon, A. I. Ostrovidov, K. Park, T. Mineeva, D. Protopopescu, C. Hanretty, Lorenzo Zana, S. Pozdniakov, P. L. Cole, S. Anefalos Pereira, E. Munevar, S. S. Stepanyan, H. S. Jo, M. Y. Gabrielyan, Wei-Jiang Xu, Volker D. Burkert, L. Guo, M. Ungaro, B. Zhao, C. Salgado, A. S. Biselli, M. R. Niroula, D. Branford, M. Guidal, S. S. Jawalkar, J. P. Ball, D. S. Carman, P. Khetarpal, M. Mirazita, M. Holtrop, Haiyan Gao, A. Daniel, J. M. Laget, K. Kramer, K. Joo, N. Gevorgyan, R. Dupre, M. Battaglieri, H. Moutarde, V. Batourine, B. Vernarsky, K. Mikhailov, P. Stoler, B. Dey, K. Hicks, P. Konczykowski, S. Procureur, Yujie Qiang, Martin K. Mayer, M. S. Saini, J. T. Goetz, Elton Smith, M. Anghinolfi, H. Seraydaryan, Y. G. Sharabian, I. I. Strakovsky, A. Deur, W. K. Brooks, P. Nadel-Turonski, E. Voutier, W. Gohn, C. Djalali, B. Morrison, J. McAndrew, Michael Wood, K. Hafidi, D. Doughty, D. Keller, W. J. Briscoe, W. Chen, M. Khandaker, M. J. Amaryan, V. P. Kubarovsky, O. Pogorelko, S. L. Careccia, K. L. Giovanetti, Larry Weinstein, V. Kuznetsov, S. Niccolai, H. Hakobyan, D. J. Tedeschi, I. Bedlinskiy, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), CLAS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Massachusetts Institute of Technology. Department of Physics, and Xu, W.

Subjects
Nuclear and High Energy Physics, Photon, Proton, Meson, Hadron, Nuclear Theory, FOS: Physical sciences, Photon energy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], phi meson photoproduction, 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Near threshold, 0103 physical sciences, Deuteron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Quasi free, Physics, 010308 nuclear & particles physics, Momentum transfer, NUCLEAR-BOUND QUARKONIUM, Deuterium, High Energy Physics::Experiment, Nucleon
Abstract

We report the first, kinematically-complete measurement of the differential cross section of ϕ-meson photoproduction from deuterium near the production threshold for a proton using the CLAS detector and a tagged-photon beam in Hall B at Jefferson Lab. The measurement was carried out by a triple coincidence detection of a proton, K[superscript +] and K[superscript −] near the theoretical production threshold of 1.57 GeV. The extracted differential cross sections dσ/dt for the initial photon energy range of 1.65–1.75 GeV are consistent with predictions based on a quasifree mechanism. Our finding is different from recent LEPS results on ϕ-meson photoproduction from deuterium in a similar incident photon energy range, but in a different momentum transfer region., United States. Dept. of Energy, National Science Foundation (U.S.)

Published
2011

43. Pion absorption inHe4above the delta resonance

Author

L. C. Smith, R. C. Minehart, B. Milbrath, Oliver Keith Baker, K. L. Giovanetti, R. Lourie, Donal Day, Barry Ritchie, R.M. Marshall, R. M. Sealock, S.T. Thornton, and D. J. Tedeschi

Subjects
Physics, Nuclear reaction, Baryon, Nuclear and High Energy Physics, Particle physics, Pion, Hadron, Resonance, Elementary particle, Absorption (logic), Atomic physics, Delta baryon
Abstract

The reaction $^{4}\mathrm{He}$ (${\mathrm{\ensuremath{\pi}}}^{+}$,pp)pn was measured at ${\mathit{T}}_{\mathrm{\ensuremath{\pi}}}$=500 MeV. The angular distribution of quasifree two-body absorption which was obtained agrees in detail with the free \ensuremath{\pi}d\ensuremath{\rightarrow}pp reaction and scales according to the number of T=0 pn pairs in $^{4}\mathrm{He}$. Possible evidence for pd final-state interactions is discussed. The extrapolated total cross section for four-body absorption is 2.5\ifmmode\pm\else\textpm\fi{}0.6 mb, which is substantially less than predicted from a model based on \ensuremath{\Delta}\ensuremath{\Delta} excitation.

Published
1993

44. Tensor Correlations Measured inHe3(e,e′pp)n

Author

D. Keller, M. Khandaker, B. McKinnon, G. Rosner, R. W. Gothe, V. Kuznetsov, A. Deur, N. Markov, W. K. Brooks, H. Hakobyan, J. M. Laget, M. Battaglieri, D. J. Tedeschi, I. Bedlinskiy, A. Kim, W. Kim, D. Doughty, P. Nadel-Turonski, R. P. Bennett, D. Protopopescu, Friedrich Klein, R. A. Schumacher, V. P. Kubarovsky, S. Pozdniakov, E. Voutier, E. Munevar, G. Niculescu, O. Pogorelko, S. E. Kuhn, R. Paremuzyan, C. E. Hyde, K. Joo, M. Ripani, Y. Ilieva, A. I. Ostrovidov, P. Khetarpal, S. Strauch, K. Park, Gerard Gilfoyle, G. Ricco, H. Avakian, W. Gohn, D. G. Ireland, B. Zhao, A. El Alaoui, C. S. Nepali, D. Sokhan, S. Bültmann, Volker D. Burkert, A. S. Biselli, M. Anghinolfi, N. D. Kvaltine, H. Seraydaryan, P. Konczykowski, C. Djalali, I. J. D. MacGregor, S. Stepanyan, S. Procureur, J. W. Price, R. Dupre, S. Park, B. L. Berman, J. P. Ball, K. L. Giovanetti, D. S. Carman, R. De Vita, P. Rossi, Martin K. Mayer, Avraham Klein, B. Moreno, Larry Weinstein, W. J. Briscoe, E. Pasyuk, K. A. Griffioen, H. Moutarde, K. Livingston, V. Crede, S. Anefalos Pereira, S. Niccolai, R. Dickson, C. Salgado, G. E. Dodge, H. Y. Lu, E. De Sanctis, B. Morrison, W. Tang, M. Amarian, M. Aghasyan, I. Niculescu, D. I. Sober, S. Fegan, M. Osipenko, J. McAndrew, F. Sabatié, Michael Vineyard, C. Bookwalter, Michael Wood, N. Dashyan, H. Baghdasaryan, C. Hanretty, Victor Mokeev, M. Ungaro, S. Pisano, V. Gyurjyan, P. Eugenio, M. Taiuti, Z. W. Zhao, Sergey Kuleshov, S. S. Stepanyan, M. Guidal, M. Holtrop, A. Daniel, George Davey Smith, C. E. Taylor, A. D'Angelo, L. El Fassi, L. Guo, P. Stoler, B. Dey, K. Hicks, K. Mikhailov, D. P. Watts, H. Egiyan, M. Y. Gabrielyan, Kei Moriya, C. A. Meyer, K. P. Adhikari, and D. P. Weygand

Subjects
Physics, Nuclear reaction, Particle physics, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, Few-body systems, 01 natural sciences, Baryon, Nuclear physics, Momentum, Pair production, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We have measured the $^{3}\mathrm{He}(e,{e}^{\ensuremath{'}}pp)n$ reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated $pp$ and $pn$ nucleon pairs by using kinematic cuts and measured their relative and total momentum distributions. This is the first measurement of the ratio of $pp$ to $pn$ pairs as a function of pair total momentum ${p}_{\mathrm{tot}}$. For pair relative momenta between 0.3 and $0.5\text{ }\text{ }\mathrm{GeV}/c$, the ratio is very small at low ${p}_{\mathrm{tot}}$ and rises to approximately 0.5 at large ${p}_{\mathrm{tot}}$. This shows the dominance of tensor over central correlations at this relative momentum.

Published
2010

45. Absorption of the ω and ϕ Mesons in Nuclei

Author

R. Nasseripour, K. Livingston, George Davey Smith, A. D'Angelo, P. L. Cole, L. El Fassi, M. E. McCracken, R. Dickson, V. Kuznetsov, V. Crede, R. Dupre, M. Battaglieri, B. McKinnon, W. Tang, William Brooks, A. I. Ostrovidov, F. X. Girod, B. Zhao, B. L. Berman, E. De Sanctis, S. S. Stepanyan, K. Park, M. Osipenko, E. Munevar, S. S. Jawalkar, D. Branford, D. G. Ireland, B. S. Ishkhanov, D. I. Sober, M. Mirazita, R. A. Schumacher, D. Martinez, Michael Vineyard, Volker D. Burkert, A. S. Biselli, S. L. Careccia, S. Dhamija, S. Niccolai, A. Kim, L. Graham, J. W. Price, V. Batourine, R. W. Gothe, M. R. Niroula, P. Konczykowski, S. Procureur, P. Eugenio, M. Taiuti, A. Ni, S. Strauch, A. El Alaoui, K. L. Giovanetti, D. P. Watts, Larry Weinstein, S. Stepanyan, M. Ripani, H. Egiyan, S. Park, Avraham Klein, D. Doughty, H. Hakobyan, R. De Vita, N. Hassall, M. Bellis, F. Sabatié, S. Fegan, P. Rossi, P. Collins, Z. W. Zhao, T. Mineeva, W. Kim, H. S. Jo, G. Niculescu, D. J. Tedeschi, B. Moreno, M. Paolone, P. Khetarpal, M. Y. Gabrielyan, G. Rosner, C. Salgado, D. Protopopescu, Y. Ilieva, S. Anefalos Pereira, I. Bedlinskiy, S. Pozdniakov, M. Garçon, I. Niculescu, S. Tkachenko, D. Keller, Friedrich Klein, Brian Raue, L. Guo, R. Paremuzyan, D. Schott, M. Guidal, M. Ungaro, B. Vernarsky, S. Pisano, M. Khandaker, Gerard Gilfoyle, G. Ricco, K. Joo, M. Holtrop, J. P. Ball, D. Sokhan, D. S. Carman, A. Daniel, P. Stoler, J. Zhang, B. Dey, K. Hicks, Sergey Kuleshov, C. Hanretty, Victor Mokeev, E. Seder, Y. Prok, Kei Moriya, C. A. Meyer, K. P. Adhikari, D. P. Weygand, E. Voutier, W. Gohn, I. I. Strakovsky, A. Deur, C. E. Taylor, M. Anghinolfi, H. Seraydaryan, Y. G. Sharabian, Martin K. Mayer, M. S. Saini, J. T. Goetz, C. Djalali, J. McAndrew, Michael Wood, J. Salamanca, B. Morrison, P. Nadel-Turonski, K. Hafidi, W. J. Briscoe, E. Pasyuk, V. P. Kubarovsky, and O. Pogorelko

Subjects
Nuclear reaction, Meson, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, PROPAGATION, MASS, 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, 0103 physical sciences, RHO-MESON, Nuclear Experiment, 010306 general physics, Absorption (electromagnetic radiation), MATTER, PHOTOPRODUCTION, PHOTON, DECAY, Physics, 010308 nuclear & particles physics, Nuclear matter, Antimatter, High Energy Physics::Experiment, Atomic physics, Lepton
Abstract

Because of their long lifetimes, the ω and ϕ mesons are the ideal candidates for the study of possible modifications of the in-medium meson-nucleon interaction through their absorption inside the nucleus. During the E01-112 experiment at the Thomas Jefferson National Accelerator Facility, the mesons were photoproduced from 2H, C, Ti, Fe, and Pb targets. This Letter reports the first measurement of the ratio of nuclear transparencies for the e+e- channel. The ratios indicate larger in-medium widths compared with what have been reported in other reaction channels. The absorption of the ω meson is stronger than that reported by the CBELSA-TAPS experiment and cannot be explained by recent theoretical models.

Published
2010

46. Polarization Transfer in theHe4(e→,e′p→)H3Reaction atQ2=0.8and1.3 (GeV/c)2

Author

V. Tvaskis, F. Garibaldi, Rolf Ent, A. Camsonne, J. R. Vignote, P. E. Ulmer, Y. Ilieva, B. L. Berman, R. Michaels, B. Craver, R. A. Lindgren, B. Briscoe, Andrew Puckett, K. Park, X. Zhan, X. Jiang, Jian-Ping Chen, L. Pentchev, E. Chudakov, J. Glister, C. E. Hyde-Wright, Ronald Ransome, Yi Qiang, O. Glamazdin, C. W. de Jager, Xin Qian, Bogdan Wojtsekhowski, D. G. Meekins, S. Strauch, M. E. Christy, D. J. Tedeschi, F. R. Wesselmann, L. G. Tang, Byounghoon Lee, Cynthia Keppel, V. A. Punjabi, E. Kuchina, J. Arrington, E. J. Brash, E. Cisbani, G. Kumbartzki, S. Malace, C. F. Perdrisat, F. Cusanno, E. Schulte, P. Solvignon, Ronald Gilman, R. Subedi, A. J. Sarty, Douglas Higinbotham, M. K. Jones, D. J. Margaziotis, J. M. Udías, Michael Paolone, E. Khrosinkova, Eli Piasetzky, Arijit Saha, and I. Albayrak

Subjects
Nuclear reaction, Physics, Proton, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Fermion, Nuclear physics, Baryon, Atomic physics, Nuclear Experiment, Nucleon, Dimensionless quantity
Abstract

Here, proton recoil polarization was measured in the quasielastic 4He(e→,e'p→)3H reaction at Q2 = 0.8 (GeV/c)2 and 1.3 (GeV/c)2 with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the 1H(e→,e'p→) reaction, contradicting a relativistic distorted-wave approximation, and favoring either the inclusion of medium-modified proton form factors predicted by the quark-meson coupling model or a spin-dependent charge-exchange final-state interaction. For the first time, the polarization-transfer ratio is studied as a function of the virtuality of the proton.

Published
2010

47. Differential cross sections and recoil polarizations for the reactionγp→K+Σ0

Author

L. Guo, M. Ungaro, H. Hakobyan, S. Dhamija, Michael Dugger, S. S. Stepanyan, R. De Vita, K. Livingston, D. J. Tedeschi, R. Dickson, R. W. Gothe, M. Holtrop, A. Daniel, S. Anefalos Pereira, K. Joo, E. Seder, W. Gohn, Sergey Kuleshov, I. Bedlinskiy, I. Niculescu, A. Yegneswaran, George Davey Smith, N. Guler, A. Fradi, D. Schott, Kei Moriya, C. A. Meyer, I. I. Strakovsky, V. Kuznetsov, Elton Smith, A. D'Angelo, B. L. Berman, A. Deur, C. Hanretty, A. Ni, D. Protopopescu, K. L. Giovanetti, W. K. Brooks, Larry Weinstein, B. Zhao, B. McKinnon, M. Anghinolfi, S. Pozdniakov, K. P. Adhikari, W. Tang, H. Moutarde, D. Keller, M. Ripani, C. E. Taylor, K. A. Griffioen, N. Hassall, E. De Sanctis, J. P. Ball, H. Seraydaryan, D. Branford, S. Park, L. El Fassi, M. Aghasyan, B. Vernarsky, M. Mirazita, D. S. Carman, M. Osipenko, S. Niccolai, D. I. Sober, Y. G. Sharabian, R. A. Schumacher, A. El Alaoui, Y. Ilieva, S. S. Jawalkar, Friedrich Klein, A. Kim, D. P. Watts, P. Rossi, E. Voutier, V. Batourine, Barry Ritchie, L. Graham, E. Munevar, Brian Raue, G. Rosner, R. Nasseripour, Michael L. Williams, M. Khandaker, R. Paremuzyan, Z. W. Zhao, P. Nadel-Turonski, J. McAndrew, D. G. Ireland, S. Fegan, J. Zhang, D. Martinez, R. Dupre, P. Konczykowski, S. Procureur, B. Moreno, V. Crede, Michael Wood, K. Hafidi, M. R. Niroula, Avraham Klein, I. J. D. MacGregor, Gerard Gilfoyle, D. Doughty, M. E. McCracken, G. Ricco, D. Sokhan, S. Strauch, W. Kim, G. Niculescu, M. Battaglieri, M. Y. Gabrielyan, V. P. Kubarovsky, O. Pogorelko, P. Khetarpal, F. X. Girod, C. S. Nepali, W. J. Briscoe, E. Pasyuk, H. S. Jo, V. Mokeev, C. Salgado, M. Bellis, M. F. Vineyard, J. W. Price, A. I. Ostrovidov, K. Park, Volker D. Burkert, A. S. Biselli, J. Salamanca, B. Morrison, C. Djalali, K. Mikhailov, B. Dey, K. Hicks, S. Tkachenko, and P. Eugenio

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Sigma, 01 natural sciences, Sigma baryon, Nuclear physics, Baryon, Recoil, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

High-statistics measurements of differential cross sections and recoil polarizations for the reaction. gamma p -> K(+)Sigma(0) have been obtained using the CLAS detector at Jefferson Lab. We cover center-of-mass energies (root s) from 1.69 to 2.84 GeV, with an extensive coverage in the K+ production angle. Independent measurements were made using the K(+) p pi(-)(gamma) and K(+) p(pi(-),gamma) final-state topologies, and were found to exhibit good agreement. Our differential cross sections show good agreement with earlier CLAS, SAPHIR, and LEPS results, while offering better statistical precision and a 300-MeV increase in root s coverage. Above root s approximate to 2.5 GeV, t- and u-channel Regge scaling behavior can be seen at forward and backward angles, respectively. Our recoil polarization (P(Sigma)) measurements represent a substantial increase in kinematic coverage and enhanced precision over previous world data. At forward angles, we find that P(Sigma) is of the same order of magnitude but opposite sign as P(A,) in agreement with the static SU(6) quark model prediction of P(Sigma) approximate to P(A). This expectation is violated in some mid-and backward-angle kinematic regimes, where P(Sigma) and P(Sigma) are of similar magnitudes but also have the same signs. In conjunction with several other meson photoproduction results recently published by CLAS, the present data will help constrain the partial-wave analyses being performed to search for missing baryon resonances.

Published
2010

48. Differential cross section and recoil polarization measurements for theγp→K+Λreaction using CLAS at Jefferson Lab

Author

P. Eugenio, R. De Vita, S. Anefalos Pereira, M. Taiuti, E. Munevar, E. De Sanctis, M. Ungaro, D. I. Sober, W. Kim, Kei Moriya, D. Doughty, C. A. Meyer, S. S. Stepanyan, B. P. Quinn, S. Pisano, Y. Perrin, F. X. Girod, G. Niculescu, Martin K. Mayer, B. McKinnon, D. Protopopescu, S. Fegan, S. Strauch, J. Salamanca, S. Procureur, S. Pozdniakov, H. Hakobyanm, Friedrich Klein, P. Collins, I. Niculescu, D. P. Watts, Brian Raue, K. P. Adhikari, D. J. Tedeschi, D. P. Weygand, B. Morrison, V. P. Kubarovsky, V. Crede, T. Mineeva, D. Branford, M. Bellis, F. Sabatié, M. S. Saini, O. Pogorelko, D. Schott, R. A. Schumacher, M. Mirazita, A. El Alaoui, Y. Ilieva, J. W. Price, P. Khetarpal, P. Nadel-Turonski, H. Moutarde, A. Fradi, J. P. Ball, Y. Prok, B. Vernarsky, Michael Dugger, S. Dhamija, D. S. Carman, M. Y. Gabrielyan, N. Hassall, C. Hanretty, A. I. Ostrovidov, K. Park, S. L. Careccia, R. W. Gothe, Sergey Kuleshov, V. Kuznetsov, J. T. Goetz, H. S. Jo, E. Seder, A. D'Angelo, D. G. Ireland, W. J. Briscoe, E. Pasyuk, K. L. Giovanetti, S. Niccolai, B. Moreno, K. Livingston, M. Guidal, Larry Weinstein, C. Djalali, Volker D. Burkert, M. Battaglieri, A. S. Biselli, N. Dashyan, R. Dickson, D. Keller, K. A. Griffioen, B. L. Berman, G. Rosner, J. McAndrew, E. Voutier, Avraham Klein, Michael Wood, M. Holtrop, Barry Ritchie, A. Daniel, K. Hafidi, M. Khandaker, S. Park, G. Ricco, S. Tkachenko, D. Sokhan, P. Rossi, M. Ripani, M. Osipenko, M. E. McCracken, M. F. Vineyard, M. Anghinolfi, H. Seraydaryan, Y. G. Sharabian, V. Mokeev, P. L. Cole, P. Stoler, B. Dey, A. Deur, W. K. Brooks, K. Hicks, W. Gohn, Lorenzo Zana, M. D. Mestayer, Michael L. Williams, and R. Dupre

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Lambda baryon, Lambda, 7. Clean energy, 01 natural sciences, Baryon, Nuclear physics, Pion, Recoil, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

We present measurements of the differential cross section and Lambda recoil polarization for the gamma p to K+ Lambda reaction made using the CLAS detector at Jefferson Lab. These measurements cover the center-of-mass energy range from 1.62 to 2.84 GeV and a wide range of center-of-mass K+ production angles. Independent analyses were performed using the K+ p pi- and K+ p (missing pi -) final-state topologies; results from these analyses were found to exhibit good agreement. These differential cross section measurements show excellent agreement with previous CLAS and LEPS results and offer increased precision and a 300 MeV increase in energy coverage. The recoil polarization data agree well with previous results and offer a large increase in precision and a 500 MeV extension in energy range. The increased center-of-mass energy range that these data represent will allow for independent study of non-resonant K+ Lambda photoproduction mechanisms at all production angles.

Published
2010

49. Measurement of Single and Double Spin Asymmetries in Deep Inelastic Pion Electroproduction with a Longitudinally Polarized Target

Author

Latifa Elouadrhiri, C. A. Meyer, K. P. Adhikari, E. Seder, K. Livingston, N. Dashyan, Y. Prok, H. S. Jo, P. Collins, P. Eugenio, M. Mayer, V. Kuznetsov, S. Niccolai, Daniel S. Carman, M. J. Amaryan, Y. Ilieva, R. G. Fersch, Z. W. Zhao, A. Deur, N. Guler, G. E. Dodge, H. Baghdasaryan, M. Guidal, H. Moutarde, J. Zhang, P. Rossi, P. Konczykowski, J. Salamanca, J. Ball, F. X. Girod, S. Park, Larry Weinstein, H. Seraydaryan, B. Vernarsky, D. Heddle, I. Niculescu, S. Procureur, D. Protopopescu, Michael Vineyard, B. Morrison, D. P. Watts, E. De Sanctis, S. Dhamija, Y. G. Sharabian, D. Martinez, S. Fegan, R. A. Schumacher, V. Crede, S. Stepanyan, R. Dickson, E. Voutier, M. Aghasyan, M. Taiuti, R. W. Gothe, B. Dey, N. Markov, H. Hakobyan, S. Anefalos Pereira, L. Guo, D. Doughty, M. Ungaro, D. Keller, R. Nasseripour, J. W. Price, S. S. Stepanyan, E. Pasyuk, M. R. Niroula, A. El Alaoui, B. A. Raue, M. Y. Gabrielyan, T. A. Forest, P. Nadel-Turonski, B. Zhao, S. Tkachenko, G. Ricco, Philip L. Cole, Avraham Klein, M. Ripani, T. Mineeva, S. S. Jawalkar, M. S. Saini, G. Rosner, G. Gavalian, D. J. Tedeschi, Friedrich Klein, I. Bedlinskiy, P. Bosted, E. Munevar, B. Moreno, M. Mirazita, M. Holtrop, C. Salgado, A. Daniel, Chaden Djalali, D. G. Crabb, S. E. Kuhn, M. E. McCracken, M. Anghinolfi, L. Casey, K. Moriya, N. Hassall, C. Hanretty, Y. Perrin, F. Sabatié, W. J. Briscoe, Victor Mokeev, K. Joo, K. L. Giovanetti, S. V. Kuleshov, H. Y. Lu, D. P. Weygand, M. Battaglieri, M. Osipenko, W. Kim, G. Niculescu, A. I. Ostrovidov, K. Park, D. G. Ireland, P. Khetarpal, Volker D. Burkert, A. S. Biselli, A. Fradi, R. De Vita, R. Suleiman, S. Pisano, K.H. Hicks, D. I. Sober, P. Stoler, K. A. Griffioen, S. Strauch, R. Paremuzyan, Gerard Gilfoyle, D. Sokhan, B. McKinnon, D. Branford, N. Gevorgyan, H. Avakian, W. K. Brooks, V. P. Kubarovsky, Annalisa D'Angelo, J. McAndrew, Michael Wood, K. Hafidi, E. L. Isupov, W. Gohn, R. Dupre, O. Pogorelko, M. Khandaker, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Particle physics, Meson, DRELL-YAN, Hadron, General Physics and Astronomy, FOS: Physical sciences, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, DEPENDENCE, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], SCATTERING, DISTRIBUTIONS, Nuclear Experiment (nucl-ex), 010306 general physics, FINAL-STATE INTERACTIONS, TRANSVERSE-MOMENTUM, AZIMUTHAL ASYMMETRIES, DRELL-YAN, SCATTERING, DISTRIBUTIONS, QUARK, DEPENDENCE, CLAS, QCD, Nuclear Experiment, Spin-½, Physics, FINAL-STATE INTERACTIONS, 010308 nuclear & particles physics, QUARK, TRANSVERSE-MOMENTUM, Deep inelastic scattering, AZIMUTHAL ASYMMETRIES, QCD, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, Lepton
Abstract

We report the first measurement of the transverse momentum dependence of double-spin asymmetries in semi-inclusive production of pions in deep-inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Jefferson Lab (JLab). Modulations of single spin asymmetries over the azimuthal angle between lepton scattering and hadron production planes phi have been measured over a wide kinematic range in Bjorken x and virtual photon squared four-momentum Q(2). A significant nonzero sin2 phi single spin asymmetry was observed for the first time indicating strong spin-orbit correlations for transversely polarized quarks in the longitudinally polarized proton.

Published
2010

50. Partial wave analysis of the reactionγp→pωand the search for nucleon resonances

Author

Martin K. Mayer, S. Dhamija, R. W. Gothe, M. S. Saini, D. Keller, V. Mokeev, J. Zhang, Michael Vineyard, B. Zhao, M. Guidal, G. E. Dodge, H. Y. Lu, B. L. Berman, S. S. Jawalkar, M. Mirazita, S. Tkachenko, S. Park, M. Khandaker, K. A. Griffioen, M. Holtrop, Elton Smith, A. Daniel, P. Eugenio, M. Taiuti, V. Kuznetsov, K. Livingston, C. Hanretty, M. Anghinolfi, I. Niculescu, R. A. Niyazov, H. Seraydaryan, D. Applegate, J. Salamanca, Y. G. Sharabian, Friedrich Klein, V. Crede, S. L. Careccia, P. L. Cole, J. R. Johnstone, Paolo Rossi, M. Osipenko, B. Morrison, R. Dickson, P. Stoler, E. Munevar, B. S. Ishkhanov, S. S. Stepanyan, A. D'Angelo, P. Collins, Barry Ritchie, B. Dey, S. Procureur, P. Nadel-Turonski, D. Schott, K. L. Giovanetti, L. Guo, M. Ungaro, F. X. Girod, E. L. Isupov, Michael L. Williams, Mark W. Paris, K. Hicks, Marco Ripani, F. Sabatié, Latifa Elouadrhiri, W. Kim, D. Doughty, J. P. Ball, Kei Moriya, C. A. Meyer, G. Niculescu, S. Niccolai, G. V. Fedotov, M. R. Niroula, Y. Perrin, Michael Dugger, M. Bellis, Giovanni Ricco, N. Guler, P. Khetarpal, K. P. Adhikari, S. Strauch, D. S. Carman, D. P. Weygand, J. W. Price, C. S. Nepali, K. Joo, D. P. Watts, H. Hakobyan, N. Hassall, M. E. McCracken, Sergey Kuleshov, C. Djalali, D. J. Tedeschi, H. S. Jo, R. A. Schumacher, M. Y. Gabrielyan, R. Dupre, M. Battaglieri, I. Bedlinskiy, E. Voutier, C. Salgado, D. Protopopescu, S. Pozdniakov, M. Garçon, G. Rosner, W. J. Briscoe, E. Pasyuk, Avraham Klein, Y. Ilieva, V. P. Kubarovsky, R. De Vita, O. Pogorelko, A. El Alaoui, B. Moreno, J. McAndrew, Michael Wood, K. Hafidi, S. Anefalos Pereira, E. De Sanctis, H. Baghdasaryan, D. I. Sober, S. Fegan, A. Fradi, S. Pisano, A. I. Ostrovidov, K. Park, D. G. Ireland, Volker D. Burkert, A. S. Biselli, Z. Krahn, B. McKinnon, Gerard Gilfoyle, D. Sokhan, E. Golovatch, W. Gohn, I. I. Strakovsky, A. Deur, and W. K. Brooks

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, Omega baryon, 01 natural sciences, Omega, Baryon, Pion, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon
Abstract

An event-based partial wave analysis (PWA) of the reaction {gamma}p{yields}p{omega} has been performed on a high-statistics dataset obtained using the CLAS at Jefferson Lab for center-of-mass energies from threshold up to 2.4 GeV. This analysis benefits from access to the world's first high-precision spin-density matrix element measurements, available to the event-based PWA through the decay distribution of {omega}{yields}{pi}{sup +}{pi}{sup -}{pi}{sup 0}. The data confirm the dominance of the t-channel {pi}{sup 0} exchange amplitude in the forward direction. The dominant resonance contributions are consistent with the previously identified states F{sub 15}(1680) and D{sub 13}(1700) near threshold, as well as the G{sub 17}(2190) at higher energies. Suggestive evidence for the presence of a J{sup P}=5/2{sup +} state around 2 GeV, a ''missing'' state, has also been found. Evidence for other states is inconclusive.

Published
2009

Catalog

Books, media, physical & digital resources
See catalog results