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119 results on '"C. S. Whisnant"'

1. Proton Compton Scattering from Linearly Polarized Gamma Rays

Author

X. Li, M. W. Ahmed, A. Banu, C. Bartram, B. Crowe, E. J. Downie, M. Emamian, G. Feldman, H. Gao, D. Godagama, H. W. Grießhammer, C. R. Howell, H. J. Karwowski, D. P. Kendellen, M. A. Kovash, K. K. H. Leung, D. M. Markoff, J. A. McGovern, S. Mikhailov, R. E. Pywell, M. H. Sikora, J. A. Silano, R. S. Sosa, M. C. Spraker, G. Swift, P. Wallace, H. R. Weller, C. S. Whisnant, Y. K. Wu, and Z. W. Zhao

Subjects
General Physics and Astronomy, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Differential cross sections for Compton scattering from the proton have been measured at scattering angles of $55^\circ$, $90^\circ$, and $125^\circ$ in the laboratory frame using quasimonoenergetic linearly (circularly) polarized photon beams with a weighted mean energy value of 83.4\,MeV (81.3\,MeV). These measurements were performed at the High Intensity Gamma-Ray Source facility at the Triangle Universities Nuclear Laboratory. The results are compared to previous measurements and are interpreted in the chiral effective field theory framework to extract the electromagnetic dipole polarizabilities of the proton, which gives $\alpha_{E1}^p = 13.8\pm1.2_{\rm stat}\pm0.1_{\rm BSR}\pm0.3_{\rm theo}, \beta_{M1}^p = 0.2\mp1.2_{\rm stat}\pm0.1_{\rm BSR}\mp0.3_{\rm theo}$ in units of 10$^{-4}$\, fm$^3$., Comment: 6 pages, 4 figures. Version identical to the published letter

Published
2021

2. Compton scattering from He4 at the TUNL HIγS facility

Author

A. Banu, S.F. Mikhailov, D. M. Markoff, C. S. Whisnant, Musa Ahmed, Michael A. Kovash, C. Bartram, Hugon J Karwowski, P. Wallace, E. J. Downie, D. P. Kendellen, M. Emamian, Mark Spraker, R. S. Sosa, X. Li, G. Swift, Harald W. Grießhammer, Ying Wu, Haiyan Gao, D. Godagama, M. H. Sikora, C. R. Howell, Z. W. Zhao, R. E. Pywell, B. J. Crowe, K. K. H. Leung, Gerald Feldman, Jack Silano, and H. R. Weller

Subjects
Physics, Proton, 010308 nuclear & particles physics, Scattering, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Compton scattering, 01 natural sciences, Asymmetry, Nuclear physics, Angular distribution, 0103 physical sciences, Experimental work, 010306 general physics, Nucleon, Energy (signal processing), media_common
Abstract

Differential cross sections for elastic Compton scattering from $^4$He have been measured with high statistical precision at the High Intensity $\gamma$-ray Source at laboratory scattering angles of $55^\circ$, $90^\circ$, and $125^\circ$ using a quasi-monoenergetic photon beam with a weighted mean energy value of $81.3$ MeV. The results are compared to previous measurements and similar fore-aft asymmetry in the angular distribution of the differential cross sections is observed. This experimental work is expected to strongly motivate the development of effective-field-theory calculations of Compton scattering from $^4$He to fully interpret the data.

Published
2020

3. Beam–target helicity asymmetry $E$ in $K^+$ $\Sigma^-$ photoproduction on the neutron

Author

R. De Vita, D. Marchand, H. Atac, H. S. Jo, A. Filippi, L. Marsicano, N. K. Walford, O. Soto, M. Khandaker, I. J. D. MacGregor, K. Hicks, W. Phelps, R. A. Schumacher, Michael Paolone, H. Hakobyan, W. Kim, G. Charles, F. Bossu, H. Lu, S. Joosten, J. W. Price, S. Diehl, C. Salgado, William Brooks, L. Venturelli, D. Heddle, V. P. Kubarovsky, I. Bedlinskiy, Z. E. Meziani, V. Mascagna, A. Celentano, R. W. Gothe, N. Markov, Alessandro Rizzo, W. Gohn, G. Asryan, Axel Schmidt, Dustin Keller, M. Ungaro, M. Guidal, M. Contalbrigo, M. Osipenko, Z. W. Zhao, Fatiha Benmokhtar, E. L. Isupov, Y. Prok, J. Poudel, O. Pogorelko, A. I. Ostrovidov, K. Park, M. J. Amaryan, Michael Wood, K. Hafidi, M. Holtrop, M. Ehrhart, C.D. Bass, V. A. Nikonov, A. D'Angelo, D. G. Jenkins, D. G. Ireland, G. Rosner, S. Boiarinov, E. Golovatch, P. Eugenio, K. Livingston, Luciano Pappalardo, K. Joo, M. Leali, Jie Zhang, T. Kageya, Volker D. Burkert, Y. Ghandilyan, A. S. Biselli, C. W. Kim, G. Gavalian, U. Shrestha, F.-X. Girod, Gerard Gilfoyle, M. Ripani, R. G. Fersch, H. Voskanyan, A. El Alaoui, G. Angelini, Nicholas Zachariou, J. C. Carvajal, W. J. Briscoe, P. L. Cole, T. Chetry, N. Gevorgyan, D. Ho, I. I. Strakovsky, A. M. Sandorfi, A. Deur, Victor Mokeev, D. Sokhan, T. R. O'Connell, Chaden Djalali, P. Nadel Turonski, T. Mineeva, M. Bashkanov, S. Adhikari, D. Bulumulla, E. Munevar, B. McKinnon, B. S. Ishkhanov, Aditya R. Khanal, Andrea Bianconi, I. Zonta, X. Wei, P. Peng, Hovanes Egiyan, C. Munoz Camacho, P. Lenisa, M. Hattawy, J. A. Fleming, Friedrich Klein, Brian Raue, Andrew Puckett, E. Voutier, Martin K. Mayer, M. Khachatryan, K. A. Griffioen, Nikolaos Sparveris, K. P. Adhikari, C. S. Whisnant, C. Hanretty, L. Lanza, R. Dupre, M. Battaglieri, M. Lowry, S. Strauch, Eugene Pasyuk, N. Dashyan, Yordanka Ilieva, L. Barion, G. Ciullo, D. S. Carman, S. Fegan, D. P. Watts, A. V. Sarantsev, N. Tyler, J. A. Tan, P. Chatagnon, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
Nuclear and High Energy Physics, Socio-culturale, nucleon resonance, Nucleons, Photoproduction, Mesons, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, K+: photoproduction, Particle identification, Nuclear physics, chemistry.chemical_compound, PE2_2, PE2_1, CLAS, 0103 physical sciences, Neutron, Hydrogen deuteride, n: target, 010306 general physics, Nuclear Experiment, PE2_3, photon: beam, Physics, 010308 nuclear & particles physics, nucleus: target, Settore FIS/04, Resonance, helicity: asymmetry, Observable, Sigma-: photoproduction, Helicity, lcsh:QC1-999, chemistry, Excited state, spectrometer, Nucleon, lcsh:Physics, Jefferson Lab, experimental results
Abstract

We report a measurement of a beam–target double-polarisation observable (E) for the γ→n→(p)→K+Σ−(p) reaction. The data were obtained impinging the circularly-polarised energy-tagged photon beam of Hall B at Jefferson Lab on a longitudinally-polarised frozen-spin hydrogen deuteride (HD) nuclear target. The E observable for an effective neutron target was determined for centre-of-mass energies 1.70≤W≤2.30 GeV, with reaction products detected over a wide angular acceptance by the CLAS spectrometer. These new double-polarisation data give unique constraints on the strange decays of excited neutron states. Inclusion of the new data within the Bonn-Gatchina theoretical model results in significant changes for the extracted photocouplings of a number of established nucleon resonances. Possible improvements in the PWA description of the experimental data with additional “missing” resonance states, including the N(2120)3/2− resonance, are also quantified.

Published
2020

4. Beam-target helicity asymmetry E in K0Λ and K0Σ0 photoproduction on the neutron

Author

P. Lenisa, M. Ungaro, D. G. Ireland, C. A. Meyer, R. Dupre, V. Crede, C.D. Bass, V. A. Nikonov, M. Battaglieri, P. Chatagnon, G. V. Fedotov, R. A. Montgomery, Ron L. Workman, R. Paremuzyan, R. A. Schumacher, C. S. Whisnant, K. P. Adhikari, A. Fradi, M. Osipenko, D. G. Jenkins, Nicholas M. Harrison, N. Markov, Martin K. Mayer, K. A. Griffioen, I. Zonta, I. J. D. MacGregor, A. Kim, H. Hakobyan, M. Khachatryan, D. Sokhan, H. S. Jo, Tim O'Connell, D. Marchand, S. Diehl, M. Bashkanov, B. McKinnon, A. I. Ostrovidov, K. Park, V. Mokeev, G. Khachatryan, L. Lanza, Eberhard Klempt, P. Collins, S. Niccolai, F. X. Girod, M. Contalbrigo, Sandra K. Johnston, P. Eugenio, T. Chetry, Volker D. Burkert, A. S. Biselli, Pawel Nadel-Turonski, M. Mirazita, J. Zhang, Rong Wang, J. W. Price, Alessandro Rizzo, S. Strauch, Iu. Skorodumina, C. Hanretty, George Davey Smith, M. Taiuti, C. Djalali, J. A. Tan, E. Golovatch, Y. G. Sharabian, M. Lowry, G. Charles, K. L. Giovanetti, I. Bedlinskiy, M. Rehfuss, K. Hicks, S. Adhikari, M. L. Kabir, M. Ehrhart, F. Sabatié, Andreas Klein, V. Laine, F. Cao, D. Adikaram, M. Guidal, W. Kim, Larry Weinstein, Z. Akbar, G. Rosner, P. Peng, C. Munoz Camacho, M. H. Wood, M. Hattawy, G. Niculescu, J. A. Fleming, I. I. Strakovsky, M. Holtrop, A. Filippi, A. D'Angelo, M. Ripani, Y. Ghandilyan, Carlos A. Salgado, B. A. Clary, A. M. Sandorfi, B. S. Ishkhanov, M. Khandaker, D. I. Sober, A. Deur, Hong Lu, Michael Paolone, D. Ho, S. Fegan, A. Celentano, R. W. Gothe, D. Heddle, Maxime Defurne, E. L. Isupov, W. Gohn, S. Boiarinov, R. De Vita, T. Kageya, L. El Fassi, N. K. Walford, R. G. Fersch, Frank Klein, P. L. Cole, Z. W. Zhao, Dustin Keller, G. Ciullo, J. P. Ball, Y. Prok, D. S. Carman, Nikos Sparveris, X. Wei, K. Hafidi, E. Voutier, A. Movsisyan, Yordanka Ilieva, L. Barion, V. P. Kubarovsky, D. Riser, A. El Alaoui, Nicholas Zachariou, O. Pogorelko, K. Livingston, H. Voskanyan, D. Protopopescu, W. J. Briscoe, E. Pasyuk, D. P. Watts, H. Egiyan, A. V. Sarantsev, and S. Chandavar

Subjects
Physics, Strange quark, 010308 nuclear & particles physics, media_common.quotation_subject, Nuclear Theory, Quark model, Hyperon, 01 natural sciences, Helicity, Asymmetry, Pseudoscalar meson, Nuclear physics, 13. Climate action, Isospin, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, media_common
Abstract

We report the first measurements of the E beam-target helicity asymmetry for the γn→K0Λ and K0Σ0 channels in the energy range 1.70≤W≤2.34 GeV. The CLAS system at Jefferson Lab uses a circularly polarized photon beam and a target consisting of longitudinally polarized solid molecular hydrogen deuteride with low background contamination for the measurements. The multivariate analysis method boosted decision trees is used to isolate the reactions of interest. Comparisons with predictions from the KaonMAID, SAID, and Bonn-Gatchina models are presented. These results will help separate the isospin I=0 and I=1 photocoupling transition amplitudes in pseudoscalar meson photoproduction.

Published
2018

5. Compton scattering from He4 at 61 MeV

Author

H. R. Weller, D. M. Markoff, X. Li, Musa Ahmed, Harald W. Grießhammer, D. P. Kendellen, W. Xiong, Mark Spraker, Z. W. Zhao, Gerald Feldman, S.F. Mikhailov, C. S. Whisnant, R. E. Pywell, P. Wallace, B. J. Crowe, Jack Silano, C. Bartram, Michael A. Kovash, H. Hao, Hugon J Karwowski, Xuefei Yan, A. Banu, V. Popov, E. J. Downie, C. R. Howell, Ying Wu, Haiyan Gao, and M. H. Sikora

Subjects
Physics, Photon, Field (physics), 010308 nuclear & particles physics, Nuclear Theory, Lattice field theory, Lattice (group), Compton scattering, Gamma ray, 01 natural sciences, Nuclear physics, 0103 physical sciences, Effective field theory, 010306 general physics, Nucleon
Abstract

Compton scattering, where the electromagnetic field of a real photon induces radiation multipoles by displacing charges and currents inside the nucleon, is an important probe of both the structure of light nuclei and the nucleon polarizabilities. This paper presents the first extensive and precise measurements of elastic Compton scattering on ${}^{4}$He. These results should allow precision comparisons with new calculations expected from both lattice gauge and effective field theories.

Published
2017

6. Beam-Target Helicity Asymmetry for γ→n→→π−p in the N* Resonance Region

Author

C. Gleason, Barry Ritchie, G. V. Fedotov, K. P. Adhikari, J. Ball, M. Hattawy, D. P. Watts, Marco Ripani, H. Hakobyan, G. Rosner, S. Fegan, F. X. Girod, M. Ungaro, K. A. Griffioen, I. I. Strakovsky, K. Livingston, R. Paremuzyan, C. Djalali, X. Wei, A. V. Sarantsev, A. Deur, L. Elouadrhiri, Y. Ghandilyan, R. A. Schumacher, Nicholas M. Harrison, Gerard Gilfoyle, Z. Akbar, V. Crede, L. Lanza, D. I. Glazier, M. Osipenko, Jie Zhang, E. Pasyuk, G. Khachatryan, R. A. Montgomery, P. Lenisa, P. L. Cole, G. Ciullo, D. Sokhan, N. Markov, D. S. Carman, W. Phelps, V. P. Kubarovsky, D. Riser, P. Eugenio, L. Clark, M. Bashkanov, V. Laine, O. Pogorelko, W. J. Briscoe, F. J. Klein, S. Niccolai, R. Fersch, S. M. Hughes, B. McKinnon, Nikolaos Sparveris, A. Movsisyan, M. M. Lowry, I. Zonta, R. De Vita, N. Dashyan, H. S. Jo, C. Salgado, Avraham Klein, Ron L. Workman, F. Sabatié, I. Bedlinskiy, L. Colaneri, Andrea Celentano, C. Bass, Dustin Keller, H. Y. Lu, Yordanka Ilieva, E. Golovatch, S. Strauch, N. K. Walford, R. Dupre, G. Charles, Alfred Švarc, S. Procureur, L. El Fassi, Victor Mokeev, Z. W. Zhao, J. A. Fleming, J. W. Price, D. Ho, Michael Wood, T. Kageya, A. M. Sandorfi, Y. G. Sharabian, Taya Chetry, S. Anefalos Pereira, I. J. D. MacGregor, W. Kim, P. Collins, G. Niculescu, V. A. Nikonov, A. D'Angelo, R. W. Gothe, C. S. Whisnant, E. L. Isupov, M. Battaglieri, Ye Tian, H. Voskanyan, A. Fradi, K. Joo, K. Hicks, E. De Sanctis, V. Batourine, D. A. Jenkins, Sergey Kuleshov, D. G. Ireland, H. Jiang, C. S. Nepali, P. Peng, K. Park, D. I. Sober, Volker D. Burkert, C. Munoz Camacho, A. S. Biselli, Tim O'Connell, Eberhard Klempt, B. S. Ishkhanov, D. Adikaram, T. Mineeva, M. Guidal, L. Guo, Alessandro Rizzo, S. Joosten, G. D. Smith, M. Holtrop, D. Protopopescu, C. Hanretty, A. Kim, W. Gohn, E. Voutier, A. El Alaoui, Nicholas Zachariou, B. Torayev, M. J. Amaryan, H. Avakian, M. Contalbrigo, M. Khandaker, A. Filippi, M. Paolone, Iu. Skorodumina, and G. Murdoch

Subjects
Physics, Photon, 010308 nuclear & particles physics, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Helicity, Nuclear physics, Deuterium, Solid hydrogen, Isospin, 0103 physical sciences, Neutron, Invariant mass, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We report the first beam-target double-polarization asymmetries in the γ þ nðpÞ → π− þ pðpÞ reaction spanning the nucleon resonance region from invariant mass W ¼ 1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN* resonance photocouplings.

Published
2017

7. Beam-Target Helicity Asymmetry for γ[over →]n[over →]→π^{-}p in the N^{*} Resonance Region

Author

D, Ho, P, Peng, C, Bass, P, Collins, A, D'Angelo, A, Deur, J, Fleming, C, Hanretty, T, Kageya, M, Khandaker, F J, Klein, E, Klempt, V, Laine, M M, Lowry, H, Lu, C, Nepali, V A, Nikonov, T, O'Connell, A M, Sandorfi, A V, Sarantsev, R A, Schumacher, I I, Strakovsky, A, Švarc, N K, Walford, X, Wei, C S, Whisnant, R L, Workman, I, Zonta, K P, Adhikari, D, Adikaram, Z, Akbar, M J, Amaryan, S, Anefalos Pereira, H, Avakian, J, Ball, M, Bashkanov, M, Battaglieri, V, Batourine, I, Bedlinskiy, A, Biselli, W J, Briscoe, V D, Burkert, D S, Carman, A, Celentano, G, Charles, T, Chetry, G, Ciullo, L, Clark, L, Colaneri, P L, Cole, M, Contalbrigo, V, Crede, N, Dashyan, E, De Sanctis, R, De Vita, C, Djalali, R, Dupre, A, El Alaoui, L, El Fassi, L, Elouadrhiri, P, Eugenio, G, Fedotov, S, Fegan, R, Fersch, A, Filippi, A, Fradi, Y, Ghandilyan, G P, Gilfoyle, F X, Girod, D I, Glazier, C, Gleason, W, Gohn, E, Golovatch, R W, Gothe, K A, Griffioen, M, Guidal, L, Guo, H, Hakobyan, N, Harrison, M, Hattawy, K, Hicks, M, Holtrop, S M, Hughes, Y, Ilieva, D G, Ireland, B S, Ishkhanov, E L, Isupov, D, Jenkins, H, Jiang, H S, Jo, K, Joo, S, Joosten, D, Keller, G, Khachatryan, A, Kim, W, Kim, A, Klein, V, Kubarovsky, S V, Kuleshov, L, Lanza, P, Lenisa, K, Livingston, I J D, MacGregor, N, Markov, B, McKinnon, T, Mineeva, V, Mokeev, R A, Montgomery, A, Movsisyan, C, Munoz Camacho, G, Murdoch, S, Niccolai, G, Niculescu, M, Osipenko, M, Paolone, R, Paremuzyan, K, Park, E, Pasyuk, W, Phelps, O, Pogorelko, J W, Price, S, Procureur, D, Protopopescu, M, Ripani, D, Riser, B G, Ritchie, A, Rizzo, G, Rosner, F, Sabatié, C, Salgado, Y G, Sharabian, Iu, Skorodumina, G D, Smith, D I, Sober, D, Sokhan, N, Sparveris, S, Strauch, Ye, Tian, B, Torayev, M, Ungaro, H, Voskanyan, E, Voutier, D P, Watts, M H, Wood, N, Zachariou, J, Zhang, and Z W, Zhao

Abstract

We report the first beam-target double-polarization asymmetries in the γ+n(p)→π^{-}+p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN^{*} resonance photocouplings.

Published
2017

8. Site of PGF

Author

C L, Pickworth, L M, Bell, W, Greene, C S, Whisnant, and D H, Poole

Subjects
Gonadotropin-Releasing Hormone, Time Factors, Pregnancy, Animals, Cattle, Female, Dinoprost, Estrus Detection, Drug Administration Schedule, Insemination, Artificial, Progesterone
Abstract

Beef Quality Assurance programs have contributed to significant improvements in the wholesomeness of beef available for consumption. Injection site blemishes in the round have declined since the promotion of administering intramuscular injections in the neck. Unfortunately, many producers continue to administer estrus synchronization (ES) drugs in the rump. The objective of this study was to compare the effectiveness of injection site of PGF

Published
2015

9. HD gas purification for polarized HDice targets production at Jefferson Lab

Author

L Colaneri, Jeffery Storey, James Hauver Devilbiss, A. M. Sandorfi, Annalisa D’Angelo, Eugen Speiser, Carlo Schaerf, Irene Zonta, X. Wei, David Alexander Loving, Alessandro Rizzo, T. Kageya, Colleen Wallace, M. Lowry, and C. S. Whisnant

Subjects
Hydrogen, Deuterium, Residual gas analyzer, Chemistry, Impurity, law, Analytical chemistry, Gas analysis, chemistry.chemical_element, Photon beams, Electron, Distillation, law.invention
Abstract

Solid, frozen-spin targets of molecular HD were rst developed for nuclear physics by a collaboration between Syracuse University and Brookhaven National Lab. They have been successfully used in measurements with photon beams, rst at the Laser-Electron-Gamma-Source [1] and most recently at Je erson Lab during the running of the E06-101 (g14) experiment [2]. Preparations are underway to utilize the targets in future electron experiments after the completion of the 12 GeV JLab upgrade [3]. HD is an attractive target since all of the material is polarizable, of low Z, and requires only modest holding elds. At the same time, the small contributions from the target cell can be subtracted from direct measurements. Reaching the frozen-spin state with both high polarization and a signi cant spin relaxation time requires careful control of H2 and D2 impurities. Commercially available HD contains 0.5 - 2% concentrations of H2 and D2. Low-temperature distillation is required to reduce these concentrations to the 10􀀀4 level to enable useful target production. This distillation is done using a column lled with heli-pack C [4] to give good separation e ciency. Approximately 12 moles of commercial HD is condensed into the mechanically refrigerated system at the base temperature ofmore » 11K. The system is then isolated and the temperature stabilized at 18K producing liquid HD, which is boiled by a resistive heater. The circulation established by the boil-o condensing throughout the column then ltering back down produces a steady-state isotopic separation permitting the extraction of HD gas with very low H2 and D2 content. A residual gas analyzer initially monitors distillation. Once the H2 concentration falls below its useful operating range, samples are periodically collected for analysis using gas chromatography [5] and Raman scattering. Where the measurement techniques overlap, good agreement is obtained. The operation of the distillery and results of gas analysis will be discussed. References [1] Phy. Rev. Lett. 101 (2009) 172002. [2] www.jlab.org/exp_prog/proposals/06/PR-06-101.pdf [3] www.jlab.org/exp_prog/proposals/12/PR12-12-009.pdf, www.jlab.org/exp_prog/proposals/12/PR12-12-010.pdf, and www.jlab.org/exp_prog/proposals/11/PR12-11-111.pdf [4] Nucl. Inst. Meth. 664 (2012) 347, www.wilmad-labglass.com/Products/LG-6730-104/ [5] Rev. Sci. Instrum. 82, 024101 (2011).« less

Published
2014

10. Prompt neutron polarization asymmetries in photofission ofTh232,U233,235,238,Np237, andPu239,240

Author

J. R. Tompkins, M. S. Johnson, L. S. Myers, W. R. Zimmerman, Jonathan Mueller, R. Vogt, Mohammad Ahmed, H. R. Weller, S. Stave, M. C. Spraker, Jørgen Randrup, C. S. Whisnant, Hugon J Karwowski, and M. H. Sikora

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Prompt neutron, Linear polarization, Astrophysics::High Energy Astrophysical Phenomena, High intensity, Photofission, Beam polarization, Fission neutron, Polarization (waves)
Abstract

Photofission experiments were performed on targets of $^{232}\mathrm{Th}$, $^{233,235,238}\mathrm{U},$ $^{237}\mathrm{Np}$, and $^{239,240}\mathrm{Pu}$ using nearly 100% linearly polarized, high intensity ($\ensuremath{\sim}5\ifmmode\times\else\texttimes\fi{}{10}^{6}\ensuremath{\gamma}/$s), and nearly-monoenergetic $\ensuremath{\gamma}$-ray beams having energies between 5.3 and 7.6 MeV at the High Intensity $\ensuremath{\gamma}$-ray Source (HI$\ensuremath{\gamma}$S) located at Duke University and Triangle Universities Nuclear Laboratory. An array of 12--18 liquid scintillator detectors was used to measure prompt fission neutron yields parallel and perpendicular to the plane of beam polarization. Polarization asymmetries, the differences between the in-plane and out-of-plane yields divided by their sums, were measured. Asymmetries close to zero were found for ${}^{233,235}$U, $^{237}\mathrm{Np}$, and ${}^{239}$Pu while significant asymmetries ($\ensuremath{\sim}$0.2--0.5) were found for $^{232}\mathrm{Th}$, ${}^{238}$U, and ${}^{240}$Pu. Predictions based on previously measured photofission fragment angular distributions combined with a model of prompt neutron emission agree well with the experimental results.

Published
2014

11. A portable cryostat for the cold transfer of polarized solid HD targets: HDice-I

Author

B. M. Preedom, Harald Glueckler, X. Wei, H. Seyfarth, M. Blecher, G. Dezern, T. Kageya, F. Lincoln, V. Laine, A. Deur, C. E. Thorn, A. Honig, H. Stroeher, M. Lowry, A. D'Angelo, M. Khandaker, C. S. Whisnant, P. Peng, C. Bade, D. Ho, A. M. Sandorfi, M. Pap, C. Hanretty, Tim O'Connell, J. Mahon, C.D. Bass, and A. Caracappa

Subjects
Physics, Cryostat, Nuclear and High Energy Physics, Liquid helium, Solid hydrogen deuteride, chemistry.chemical_element, Halbach rare-earth magnet, Liquid nitrogen, Neodymium, Frozen-spin target, Spin relaxation, law.invention, Settore FIS/04 - Fisica Nucleare e Subnucleare, chemistry.chemical_compound, Dipole, chemistry, law, Magnet, Hydrogen deuteride, Dilution refrigerator, Atomic physics, Instrumentation
Abstract

A device has been developed with moveable liquid nitrogen and liquid helium volumes that is capable of reaching over two meters into the coldest regions of a cryostat or dilution refrigerator and reliably extracting or installing a target of solid, polarized hydrogen deuteride (HD). This Transfer Cryostat incorporates a cylindrical neodymium rare-earth magnet that is configured as a Halbach dipole, which is maintained at 77 K and produces a 0.1 T field around the HD target. Multiple layers provide a hermetic 77 K-shield as the device is used to maintain a target at 2 K during a transfer between cryostats. Tests with frozen-spin HD show negligible polarization loss for either H or D over typical transfer periods. Multiple target transfers with this apparatus have shown an overall reliability of about 95% per transfer, which is a significant improvement over earlier versions of the device.

Published
2014

12. The E2/M1 ratio in Δ photoproduction

Author

M. Lowry, M. Blecher, H. Ströher, C. Djalali, M. Lucas, Anthony Kuczewski, A. Caracappa, G. Giordano, G. Matone, D. Rebreyend, S.T. Thornton, O. C. Kistner, J. Tonnison, R. M. Sealock, X. Zhao, C. Schaerf, K. Hicks, C. S. Whisnant, S. Hoblit, A. M. Sandorfi, L. Miceli, B. M. Preedom, C. E. Thorn, G. S. Blanpied, H. Zhang, and M. Khandaker

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Amplitude, Compton scattering, Mixing ratio, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Polarization (waves)
Abstract

New high-precision measurements of p( γ , π) and p( γ , γ) cross sections and beam asymmetries have been combined with other polarization ratios in a simultaneous analysis of both reactions. Compton scattering has provided two important new constraints on the photo-pion amplitude. The E2/M1 mixing ratio for the N → Δ transition extracted from this analysis is EMR = -3.0% ± 0.3 (stat + sys) ± 0.2 (model).

Published
1998

13. N→ΔTransition from Simultaneous Measurements ofp(γ→,π)andp(γ→,γ)

Author

S. Hoblit, C. E. Thorn, M. Lowry, M. Blecher, M. Khandaker, O. C. Kistner, H. Ströher, G. Matone, C. S. Whisnant, K. Hicks, X. Zhao, H. Zhang, B. M. Preedom, A. M. Sandorfi, G. S. Blanpied, R. M. Sealock, L. Miceli, A. Caracappa, D. Rebreyend, C. Schaerf, C. Djalali, M. Lucas, J. Tonnison, G. Giordano, S.T. Thornton, and Anthony Kuczewski

Subjects
Physics, Delta, Transition (genetics), Pi, Analytical chemistry, General Physics and Astronomy, Gamma gamma
Published
1997

14. Spin asymmetries from16O(γ→,pπ−)nearΔresonance energies

Author

S. Hoblit, O. C. Kistner, A. M. Sandorfi, K. Hicks, B. E. Norum, M. Lucas, L. E. Wright, A. Cichocki, S.T. Thornton, R. A. Lindgren, A. Caracappa, J. Rapaport, C. S. Whisnant, R. M. Sealock, H. Baghaei, Frank X. Lee, L. C. Smith, C. E. Thorn, V. Gladyshev, T. Gresko, M. Khandaker, R. W. Finlay, G. Davenport, and L. Miceli

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Pion, Proton, Momentum transfer, Propagator, Sensitivity (control systems), Nuclear Experiment, Spin-½
Abstract

Spin asymmetries for the ${}^{16}\mathrm{O}(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},p{\ensuremath{\pi}}^{\ensuremath{-}})$ reaction are reported for incident photon energies of 293 $\ifmmode\pm\else\textpm\fi{}$ 20 MeV, proton angles ranging from 28$\ifmmode^\circ\else\textdegree\fi{}$ to 140$\ifmmode^\circ\else\textdegree\fi{}$ (lab), and pion angles of 35$\ifmmode^\circ\else\textdegree\fi{}$ to 115$\ifmmode^\circ\else\textdegree\fi{}$. The data are compared with calculations in a quasifree plane-wave impulse approximation model. This model is in good agreement with the data at small momentum transfer $q$, but does not follow the trend of the data at large $q$. Sensitivity to the $\ensuremath{\Delta}$-nucleus potential and to modification of the $\ensuremath{\Delta}$ lifetime from nuclear medium effects are explored using a simple modification of the $\ensuremath{\Delta}$ propagator in the calculations.

Published
1997

15. Polarized Compton Scattering from the Proton

Author

C. Schaerf, B. M. Preedom, M. Khandaker, R. M. Sealock, C. E. Thorn, A. Caracappa, L. Miceli, S. Hoblit, C. Molinari, D. Rebreyend, G. S. Blanpied, O. C. Kistner, S.T. Thornton, A. M. Sandorfi, K. Hicks, H. Zhang, G. Giordano, Chaden Djalali, M. Blecher, X. Zhao, G. Matone, C. S. Whisnant, and H. Ströher

Subjects
Nuclear physics, Physics, X-ray Raman scattering, Proton, Scattering, Compton scattering, General Physics and Astronomy, Scattering length, Compton wavelength, Inelastic scattering
Published
1996

16. Alpha Adrenergic Neurons Inhibit Luteinizing Hormone Pulse Amplitude in Breeding Season Ewes1

Author

R L Havern, Robert L. Goodman, and C S Whisnant

Subjects
Estrous cycle, endocrine system, medicine.medical_specialty, Phenoxybenzamine, Antagonist, Cell Biology, General Medicine, Biology, Preoptic area, Endocrinology, Reproductive Medicine, Hypothalamus, Internal medicine, Follicular phase, Prazosin, medicine, Luteinizing hormone, hormones, hormone substitutes, and hormone antagonists, medicine.drug
Abstract

It is now clear that estradiol acts in the brain to inhibit LH pulse amplitude in breeding season ewes, but the neural mechanisms underlying this action of estradiol have yet to be determined. In this study, we performed four experiments to examine the role of aadrenergic neurons in the control of LH pulse amplitude in the ewe. In the first experiment, implantation of the a-adrenergic antagonist phenoxybenzamine into the preoptic area (POA) during the follicular phase of the ovine estrous cycle significantly increased LH pulse amplitude. A similar stimulatory effect of POA implants of this antagonist was observed in estradiol-treated ovariectomized (OVX+E) ewes, but phenoxybenzamine implants had no effect in the absence of estradiol. In contrast, systemic administration of phenoxybenzamine decreased LH pulse amplitude in both OVX and OVX + E ewes. Finally, POA implants of the a,-adrenergic antagonist, prazosin, increased LH pulse amplitude in OVX+E ewes, whereas the a, 2-adrenergic antagonist, yohimbine, had no effect in these animals. These results suggest that a noradrenergic (or adrenergic) system acts in the POA via a,-adrenergic receptors to inhibit LH pulse amplitude in the ewe. They also raise the possibility that this system may be involved in the negative feedback action of estradiol during the breeding season.

Published
1996

17. New measurements ofH2(γ→,p)nand spin problems in coupledNΔ/NNinteractions

Author

O. C. Kistner, L. Miceli, C. S. Whisnant, K. Hicks, G. S. Blanpied, C. Djalali, M. Khandaker, G. Giordano, S. Hoblit, A. Caracappa, C. E. Thorn, R. M. Sealock, A. M. Sandorfi, D. Rebreyend, W. K. Mize, H. Arenhövel, X. Zhao, M. Blecher, G. Matone, K. Vaziri, P. Wilhelm, M-A. Duval, S.T. Thornton, C. Schaerf, and B. M. Preedom

Subjects
Physics, Nuclear and High Energy Physics, Condensed matter physics, 010308 nuclear & particles physics, 0103 physical sciences, NAND gate, 010306 general physics, 01 natural sciences, Spin-½
Published
1995

18. New investigations of polarized solid HD targets

Author

C. S. Whisnant, A. M. Sandorfi, X. Wei, A. Honig, and Q. Fan

Subjects
Physics, Cryostat, Nuclear and High Energy Physics, business.industry, Polarization (waves), Ionizing radiation, Optics, Polarizability, Interfacial thermal resistance, Photon beams, Atomic physics, Nucleon, business, Instrumentation, Short duration
Abstract

Polarized solid HD targets in a frozen-spin mode, with superior nuclear physics characteristics and simple operational configurations, have previously been restricted in their deployment due to a disproportionate target production time with respect to utilization time. Recent investigations have yielded frozen-spin polarization lifetimes, at a convenient target temperature of 1.5 K, of nearly a year for both H and D at high holding fields, and of more than a week at sub-Tesla holding fields. These results, taken together with the advent of new interesting spin-physics using relatively weakly ionizing beams, such as polarized photon beams, remove the above impediment and open up the use of polarized solid HD to long duration nuclear spin-physics experiments. Large, multiple targets can be produced, retrieved from the polarization-production apparatus with a cold-transport (4 K) device, stored for very long times in inexpensive (1.5 K, 7 T) cryostats, and introduced “off-the-shelf” into in-beam cryostats via the portable cold-transport apparatus. Various modes for achieving polarized H and/or D, as well as already achieved and expected polarization values, are reported. Experimental results are given on Kapitza resistance between the solid HD and the cooling wires necessary to obtain low temperatures during the heat-evolving polarization process. 15 mK is achievable using gold-plated aluminum wires, which constitute 15% extraneous nucleons over the number of polarizable H or D nucleons. Application to more highly ionizing beams is also given consideration.

Published
1995

19. 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

20. Results from polarized experiments at LEGS and GRAAL

Author

C. S. Whisnant, F. Ghio, A. D'Angelo, D. Rebreyend, D. Franco, S. Kucuker, M. Lowry, A. M. Lapik, Giuseppe Mandaglio, A. Giusa, A. Turinge, N. V. Rudnev, C. E. Thorn, S. Hoblit, B. Preedom, M. Khandaker, M. L. Sperduto, J.-P. Bocqueti, C. Gibson, Marina Manganaro, S. Kizilgul, A. Caracappa, Marco Capogni, A. Sandorfi, M. Lucas, K. Ardashev, G. Gervino, J. Mahon, M. C. Sutera, A. Lehmann, M. Pap, L. Miceli, A. Fantini, C. Schaerf, X. Wei, F. Mammoliti, D. Moricciani, L. Casano, M. Blecher, K. Hicks, H. Seyfarth, A. Honig, B. Norum, V. Vegna, T. Kageya, H. Stroher, C. Bade, Annick Lleres, G.V. Russo, V. G. Nedorezov, V. Bellini, H. Glükler, M. Castoldi, G. Giardina, K. Wang, P. Levi Sandri, B. Girolami, O. C. Kistner, R. Di Salvo, O. Bartalini, C. Randieri, A. N. Mushkarenkov, 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), GRAAL, and LEGS

Subjects
Particle physics, POSITIVE PION-PHOTOPRODUCTION, media_common.quotation_subject, Nuclear Theory, Photoreactions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], PROTON, 7. Clean energy, 01 natural sciences, Asymmetry, NUCLEONIC RESONANCE EXCITATIONS, SIGMA-BEAM ASYMMETRY, DECAYS, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Pion, 0103 physical sciences, N-PI, GAMMA-P, PRECISE MEASUREMENT, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Circular polarization, media_common, Physics, polarized photon beams, polarized targets, BARYON RESONANCES, MESON PHOTOPRODUCTION, 010308 nuclear & particles physics, Gamma ray, Polarization (waves), Compton backscattering, 3. Good health, Deuterium, SIGMA-BEAM ASYMMETRY, NUCLEONIC RESONANCE EXCITATIONS, POSITIVE PION-PHOTOPRODUCTION, BARYON RESONANCES, MESON PHOTOPRODUCTION, PRECISE MEASUREMENT, GAMMA-P, N-PI, PROTON, DECAYS, High Energy Physics::Experiment, Beam (structure)
Abstract

Compton backscattering gamma ray beams are characterized by a high degree of linear and circular polarization with low unpolarized backgrounds and have proven to provide very precise measurements of polarization observables. Latest results from LEGS and GRAAL experiments on proton and deuteron targets are presented. The Σ beam asymmetry for ω photoproduction has been measured by the GRAAL collaboration for both the ω→π0γ and the ω→π+π−π0 decay channels on the proton target; single and double polarization asymmetries have been provided also for the K photoproduction channel. E and G double polarization asymmetries for single pion photoproduction on the proton and deuteron have been measured at LEGS using a frozen spin HD target.

Published
2012

21. Incompatibility of multipole predictions for the nucleon spin-polarizability and Drell-Hearn-Gerasimov sum rules

Author

M. Khandaker, C. S. Whisnant, and A. M. Sandorfi

Subjects
Physics, Particle physics, Meson, Computer Science::Information Retrieval, Nuclear Theory, Hadron, Pion, Polarizability, Isospin, High Energy Physics::Experiment, Sum rule in quantum mechanics, Nuclear Experiment, Nucleon, Multipole expansion
Abstract

Energy-weighted integrals of the difference in helicity-dependent photoreaction cross sections ([sigma][sub 1/2]-[sigma][sub 3/2]) provide information on the nucleon's spin-dependent polarizability ([gamma]), and on the spin-dependent part of the asymptotic forward Compton amplitude through the Drell-Hearn-Gerasimov (DHG) sum rule. Estimates from current [pi]-photoproduction multipole analyses, particularly for the [ital proton]-[ital neutron] [ital difference], are in good agreement with relativistic-one-loop chiral calculations for [gamma] but predict large deviations from the DHG sum rule. Either (a) [ital both] the two-loop corrections to the spin-polarizability are large [ital and] the existing multipoles are wrong, [ital or] (b) modifications to the Drell-Hearn-Gerasimov sum rule are required to fully describe the isospin structure of the nucleon.

Published
1994

22. 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

23. Dopaminergic structures in the ovine hypothalamus mediating estradiol negative feedback in anestrous ewes

Author

Robert L. Goodman, R L Havern, and C S Whisnant

Subjects
medicine.medical_specialty, Apomorphine, Tyrosine 3-Monooxygenase, medicine.drug_class, Dopamine, Ovariectomy, Hypothalamus, Biology, Anestrus, Feedback, Endocrinology, Pimozide, Internal medicine, medicine, Animals, Neurons, Estrous cycle, Sheep, Estradiol, Reproduction, Dopaminergic, Luteinizing Hormone, Prolactin, Thyroxine, Estrogen, Ovariectomized rat, Female, Gonadotropin, medicine.drug
Abstract

This study examined the role of two dopaminergic (DA) cell groups, the A-14 and A-15 DA groups, in the seasonal shift in the response of LH to estradiol negative feedback in ewes. Radiofrequency lesions were placed bilaterally, in the area of the A-15 or the ventromedial A-14 cell groups of ovariectomized ewes, while control animals underwent sham neurosurgery. The effect of estrogen was tested in anestrus by analyzing LH pulse patterns before and 3 and 10 days after the insertion of estradiol implants. To evaluate the effects of these lesions on DA inhibition of LH secretion, LH pulse patterns were compared before and after an iv injection of the DA antagonist pimozide on day 3 of estradiol treatment. LH pulses were also examined in these ewes during the breeding season before and 3 days after the insertion of estradiol implants. Also, the effect of the DA receptor agonist apomorphine was tested to determine any effect of lesions on DA receptors inhibitory to LH. Lesions in either the A-14 or A-15 area decreased, but did not completely abolish, estradiol inhibition of LH pulse frequency in anestrus. Both types of lesions also blocked the stimulatory effects of pimozide on LH pulse frequency in estradiol-treated ovariectomized anestrous ewes. During the breeding season, estrogen decreased LH pulse amplitude, but not frequency, in all groups. The DA receptor agonist apomorphine decreased LH pulse frequency in all groups. Furthermore, immunohistochemistry for tyrosine hydroxylase revealed catecholaminergic fibers apparently connecting the caudal A-14 and the rostral A-15 areas. These results suggest that both the A-14 and A-15 DA cell groups are involved in the inhibition of LH by estradiol in anestrous, but not breeding season, ewes. Seasonal shifts in the activity of these DA neurons may, thus, play a role in the annual reproductive cycle of the ewe.

Published
1994

24. 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

25. Effects of stress associated with weaning on the adaptive immune system in pigs

Author

A R, Kick, M B, Tompkins, W L, Flowers, C S, Whisnant, and G W, Almond

Subjects
Male, B-Lymphocytes, Hydrocortisone, Neutrophils, Swine, T-Lymphocytes, Body Weight, Weaning, Adaptive Immunity, Flow Cytometry, Animals, Suckling, Blood Cell Count, Random Allocation, Animals, Female, Least-Squares Analysis
Abstract

This study was designed to investigate the effects of weaning age on specific components of the adaptive immune system in pigs. Twenty-three crossbred pigs were randomly assigned to 1 of 3 treatments: weaning at 14 (14D, n = 8), 21 (21D, n = 7), or 28 (28D, n = 8) d of age. Peripheral blood samples, obtained when pigs were 13, 15, 20, 22, 27, 29, and 35 d of age, were analyzed for peripheral blood cell percentages and concentrations of neutrophils, lymphocytes, T cell subsets, mature B cells, and plasma cortisol concentrations. For each of the 3 groups, weaning increased plasma cortisol concentrations (P0.001) and reduced BW percentage change (P0.017). Lymphocyte concentrations displayed a treatment effect for the 14D (P = 0.074) and 28D (P = 0.014) groups. Albeit inconsistent, lymphocyte concentrations were less in weaned pigs on the day after weaning than in pigs remaining on the sow or weaned at a younger age. Specifically, mature B cells (CD21(+)) and CD4(+)CD8(+) cells decreased (P0.05) after weaning at 28 d of age. Other differences occurred among treatments; however, the differences apparently were not associated with weaning. Based upon the immunological measures used in the present study, there was not an explicit benefit to the adaptive immune system for any weaning age. Early weaning did not negatively affect the adaptive immunological competence of pigs as determined by changes in populations of immune cells.

Published
2011

26. HD GAS DISTILLATION AND ANALYSIS FOR HD FROZEN SPIN TARGETS

Author

V. Vegna, T. Kageya, E. Speiser, M. Lowry, W. Richter, C. Schaerf, A. M. Sandorfi, A. Deur, S. Del Gobbo, A. Fantini, B. Buick, A. D'Angelo, C. S. Whisnant, and X. Wei

Subjects
symbols.namesake, Materials science, law, symbols, Gas chromatography, Atomic physics, Spin (physics), Distillation, Raman scattering, law.invention
Published
2011

27. p(γ→,π0) reaction and theE2 excitation of the Δ

Author

S.T. Thornton, Murray Moinester, M. A. Duval, W. K. Mize, X. Zhao, C. Schaerf, K. Vaziri, B. M. Preedom, C. E. Thorn, R. M. Sealock, M. Khandaker, A. M. Sandorfi, O. C. Kistner, C. S. Whisnant, M. Blecher, L. Miceli, G. Matone, C. Djalali, G. Giordano, A. Caracappa, S. Hoblit, and G. S. Blanpied

Subjects
Baryon, Physics, Pion, Linear polarization, Hadron, General Physics and Astronomy, Resonance, Elementary particle, Atomic physics, Excitation, Delta baryon
Abstract

Results from three independent measurements of the {ital p}({rvec {gamma}},{pi}{sup 0}) reaction are presented for incident photon energies between 243 and 314 MeV, and for c.m. angles of 105{degree}, 122{degree}, and 150{degree}. The ratio of cross sections measured with orthogonal states of linear polarization is sensitive to the {ital E}2 excitation of the {Delta} resonace. Comparisons are made to the predictions of various models, all of which fail to reproduce these data.

Published
1992

28. Measurements ofH→D→(γ→,π)and Implications for the Convergence of the Gerasimov-Drell-Hern Integral

Author

S. Hoblit, A. M. Sandorfi, K. Ardashev, C. Bade, O. Bartalini, M. Blecher, A. Caracappa, A. D’Angelo, A. d’Angelo, R. Di Salvo, A. Fantini, C. Gibson, H. Glückler, K. Hicks, A. Honig, T. Kageya, M. Khandaker, O. C. Kistner, S. Kizilgul, S. Kucuker, A. Lehmann, M. Lowry, M. Lucas, J. Mahon, L. Miceli, D. Moricciani, B. Norum, M. Pap, B. Preedom, H. Seyfarth, C. Schaerf, H. Ströher, C. E. Thorn, C. S. Whisnant, K. Wang, and X. Wei

Subjects
Physics, Nuclear physics, Baryon, Meson, Hadron, General Physics and Astronomy, Elementary particle, Production (computer science), Sum rule in quantum mechanics, Nucleon, Delta baryon
Abstract

We report new measurements of inclusive $\ensuremath{\pi}$ production from frozen-spin HD for polarized photon beams covering the $\ensuremath{\Delta}(1232)$ resonance. These provide data simultaneously on both H and D with nearly complete angular distributions of the spin-difference cross sections entering the Gerasimov-Drell-Hearn (GDH) sum rule. Recent results from Mainz and Bonn exceed the GDH prediction for the proton by $22\text{ }\text{ }\ensuremath{\mu}\mathrm{b}$, suggesting as yet unmeasured high-energy components. Our ${\ensuremath{\pi}}^{0}$ data reveal a different angular dependence than assumed in Mainz analyses and integrate to a value that is $18\text{ }\text{ }\ensuremath{\mu}\mathrm{b}$ lower, suggesting a more rapid convergence. Our results for deuterium are somewhat lower than published data, considerably more precise, and generally lower than available calculations.

Published
2009

29. Pion scattering to6−stretched states inMg24andMg26

Author

S. J. Seestrom-Morris, C. S. Whisnant, Barry Ritchie, Ronald Gilman, C. S. Mishra, Christopher Morris, B. H. Wildenthal, C. Fred Moore, G. S. Blanpied, J. A. Carr, R. A. Lindgren, J. Hernandez, Peter A. Seidl, W. K. Mize, and B. L. Clausen

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Pion, Isovector, Scattering, Isoscalar, Order (ring theory), Scattering length, Inelastic scattering, Atomic physics
Abstract

Inelastic ${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$ cross-section measurements at pion incident energies of 150 and 180 MeV were made on ${6}^{\mathrm{\ensuremath{-}}}$ states in $^{24,26}\mathrm{Mg}$. In particular, we have determined the (${\mathit{f}}_{7/2}$${\mathit{d}}_{5/2}^{\mathrm{\ensuremath{-}}1}$${)}_{6}^{\mathrm{\ensuremath{-}}}$ isoscalar ${\mathit{Z}}_{0}$=0.21\ifmmode\pm\else\textpm\fi{}0.02 strength for the strongest T=0, ${\mathit{J}}^{\mathrm{\ensuremath{\pi}}}$=${6}^{\mathrm{\ensuremath{-}}}$ state located at 12.11\ifmmode\pm\else\textpm\fi{}0.05 MeV in $^{24}\mathrm{Mg}$, and the isoscalar ${\mathit{Z}}_{0}$=0.17\ifmmode\pm\else\textpm\fi{}0.04 and isovector ${\mathit{Z}}_{1}$=0.21\ifmmode\pm\else\textpm\fi{}0.02 strength for the strongest T=1, ${\mathit{J}}^{\mathrm{\ensuremath{\pi}}}$=${6}^{\mathrm{\ensuremath{-}}}$ state located at 9.18 MeV in $^{26}\mathrm{Mg}$. The distorted-wave impulse-approximation pion cross-section calculations required a multiplicative normalization factor of 1.2\ifmmode\pm\else\textpm\fi{}0.1 in order to reproduce the pure isovector strength deduced from electron scattering for the well-known T=1, $^{\mathrm{\ensuremath{\pi}}}$=${6}^{\mathrm{\ensuremath{-}}}$ state at 15.15 MeV in $^{24}\mathrm{Mg}$ and the T=2, ${\mathit{J}}^{\mathrm{\ensuremath{\pi}}}$=${6}^{\mathrm{\ensuremath{-}}}$ state at 18.05 MeV in $^{26}\mathrm{Mg}$.

Published
1991

30. Beam-polarization observables in D(γ→,p)nand the nuclear tensor force

Author

S.T. Thornton, A. Caracappa, C. S. Whisnant, O. C. Kistner, G. S. Blanpied, S. Hoblit, K. Vaziri, M. A. Duval, W. K. Mize, R. M. Sealock, C. Djalali, C. E. Thorn, G. Giordano, A. M. Sandorfi, C. Schaerf, M. Blecher, G. Matone, B. M. Preedom, and L. Miceli

Subjects
Nuclear reaction, Physics, Photon, Linear polarization, Nuclear Theory, General Physics and Astronomy, Observable, Particle detector, Nuclear physics, Nuclear force, Tensor, Sensitivity (control systems), Atomic physics, Nuclear Experiment
Abstract

New precision angular distribution data for the D({gamma},{ital p}){ital n} reaction are presented for incident photon energies of 191 and 222 MeV. The difference of cross sections measured with orthogonal states of linear polarization is sensitive to the short-range behavior of the tensor interaction in models of the nuclear force. Comparisons with the Bonn and Paris potentials illustrate the sensitivity.

Published
1991

31. Hypothalamic Sites of Catecholamine Inhibition of Luteinizing Hormone in the Anestrous Ewe1

Author

R L Havern, C S Whisnant, and Robert L. Goodman

Subjects
Estrous cycle, endocrine system, medicine.medical_specialty, Antagonist, Cell Biology, General Medicine, Biology, Prolactin, Preoptic area, Endocrinology, Pimozide, Reproductive Medicine, Hypothalamus, Internal medicine, Median eminence, medicine, Luteinizing hormone, medicine.drug
Abstract

Norepinepherine (NE) and dopamine (DA) actively Inhibit the release of LH In anestrous ewes. This can be detected as an Increase In UI pulse frequency following l.v. injection of NE and DA antagonists.The objectiveof thisstudy was to determine the sites of these Inhibitory actions in the ovine hypothalamus by using local administrations of the NE antagonist, phenoxybenzamine (PBZ), or the DA antagonist, pimozide (PIM), Into specific hypothalamic areas. Each neurotransmltter antagonist was administered via a chronically Implanted steel guide tube into either the preoptic area (POA), retrochiasmatic area (RCh), or the median eminence region (ME). Blood samples were taken every 15 mIssfor 2 h before and 4 h during Implantation of these drugs and were analyzed for LH and prolactin by RL4..Control (no treatment) samples were obtained similarly from the same animals on another day. Placement of PBZ Into the POA significantly increased UI pulse frequency and mean UI concentrations over control values whereas PIM did not In contrast, NM significantly increased UI pulse frequency and mean UI concentrations when placed in the ME or in the RCh, but PBZ did not No effects of PIM on prolactin concentrations were detected. These results suggest that an NE neural system operates in the POA and that a DA system acts in the medial basal hypothalamus (RCh or ME) to suppressGnRH pulse frequency in the ovary-Intact anestrous ewe.

Published
1991

32. Measurements of H--D--(gamma--,pi) and implications for the convergence of the Gerasimov-Drell-Hern integral

Author

S, Hoblit, A M, Sandorfi, K, Ardashev, C, Bade, O, Bartalini, M, Blecher, A, Caracappa, A, D'Angelo, A, d'Angelo, R, Di Salvo, A, Fantini, C, Gibson, H, Glückler, K, Hicks, A, Honig, T, Kageya, M, Khandaker, O C, Kistner, S, Kizilgul, S, Kucuker, A, Lehmann, M, Lowry, M, Lucas, J, Mahon, L, Miceli, D, Moricciani, B, Norum, M, Pap, B, Preedom, H, Seyfarth, C, Schaerf, H, Ströher, C E, Thorn, C S, Whisnant, K, Wang, and X, Wei

Abstract

We report new measurements of inclusive pi production from frozen-spin HD for polarized photon beams covering the Delta(1232) resonance. These provide data simultaneously on both H and D with nearly complete angular distributions of the spin-difference cross sections entering the Gerasimov-Drell-Hearn (GDH) sum rule. Recent results from Mainz and Bonn exceed the GDH prediction for the proton by 22 microb, suggesting as yet unmeasured high-energy components. Our pi0 data reveal a different angular dependence than assumed in Mainz analyses and integrate to a value that is 18 microb lower, suggesting a more rapid convergence. Our results for deuterium are somewhat lower than published data, considerably more precise, and generally lower than available calculations.

Published
2008

34. Pion elastic and inelastic scattering fromMg24andMg26

Author

W. K. Mize, Christopher Morris, C. Fred Moore, G. S. Blanpied, Ronald Gilman, Barry Ritchie, R. A. Lindgren, J. Hernandez, Peter A. Seidl, B. H. Wildenthal, S. J. Seestrom-Morris, C. S. Mishra, and C. S. Whisnant

Subjects
Nuclear reaction, Elastic scattering, Physics, Nuclear and High Energy Physics, Crystallography, Pion, Phonon scattering, Scattering length, Atomic physics, Inelastic scattering, Ground state, Inelastic neutron scattering
Abstract

Reported are measurements of angular distributions of resonance-energy positive and negative pions exciting approximately 40 states in {sup 24}Mg and {sup 26}Mg. These include the (ground state, 0{sup +}), (1.36 MeV, 2{sup +}), (4.14, 2{sup +}), (5.93, 4{sup +}), (6.44, 0{sup +}), (7.34), (7.55, 3{sup {minus}}), (8.33, 3{sup {minus}}), (9.32, 4{sup +}), (9.97, 5{sup {minus}}), (11.08, 3{sup {minus}}), (12.06), (13.26), (13.96, 3{sup {minus}}), (15.1, {ital T}=1, 6{sup {minus}}), and (15.4) states in {sup 24}Mg and the (ground state, 0{sup +}), (1.81, 2{sup +}), (2.92, 2{sup +}), (3.59, 0{sup +}), (4.31, 2{sup +}+4{sup +}), (4.90, 4{sup +}), (5.31, 2{sup +}), (5.44, 4{sup +}), (5.69, 4{sup +}), (6.86, 3{sup {minus}}), (7.33, 3{sup {minus}}), (7.79, 3{sup {minus}}), (8.17, 3{sup {minus}}), (9.2, possible 6{sup {minus}}), (10.30, 4{sup +}), and (18.1, {ital T}=2, 6{sup {minus}}) states in {sup 26}Mg. The distorted-wave impulse approximation with a Kisslinger form for the optical potential using a {pi}-nucleon {ital t} matrix at a shifted energy of {minus}25 MeV was found to explain the elastic scattering data from {sup 24,26}Mg in the energy range 116--292 MeV that is spanned by these data. Inelastic distorted-wave impulse approximation calculations employing collective-model deformation parameters were simultaneously fitted to the {pi}{sup +} and {pi}{supmore » {minus}} data for each state.« less

Published
1990

35. 50 MeVπ+andπ−scattering fromC12

Author

R. J. Peterson, C. S. Whisnant, G. S. Adams, D. H. Wright, R. L. Boudrie, G. S. Blanpied, J. H. Mitchell, J. A. Escalante, C. S. Mishra, B. M. Preedom, and Barry Ritchie

Subjects
Nuclear reaction, Physics, Elastic scattering, Nuclear and High Energy Physics, Quasielastic scattering, Scattering, Excited state, Carbon-12, Mott scattering, Inelastic scattering, Atomic physics
Abstract

Differential cross sections were measured for 50 MeV {pi}{sup +} and {pi}{sup {minus}} elastic scattering from {sup 12}C and for 50 MeV {pi}{sup +} inelastic scattering to the (4.44 MeV, 2{sup +}), (7.65 MeV, 0{sub 2}{sup +}), (9.64 MeV, 3{sup {minus}}), (12.71 MeV, 1{sup +}), and (15.11 MeV, 1{sup +}) levels in {sup 12}C. Comparisons of the data obtained in this study to data taken previously for these states resolve discrepancies between the earlier data sets. Using a recently discussed procedure, one-step and coupled-channels calculations using a modified MSU potential were performed. The results of both one-step and coupled-channels calculations describe the data for the ground, first, and third excited states, indicative of the collective isoscalar structure of those states. The one-step analysis fails to describe the excitation of the 0{sub 2}{sup +} state. The coupled-channels calculations are more successful in describing those data, indicating that the failure of the one-step calculations may be attributed to coupled-channels effects.

Published
1990

36. Further Evidence That Serotonin Mediates the Steroid-Independent Inhibition of Luteinizing Hormone Secretion in Anestrous Ewes1

Author

Robert L. Goodman and C S Whisnant

Subjects
Estrous cycle, medicine.medical_specialty, Luteinizing hormone secretion, Methysergide, Cell Biology, General Medicine, Biology, Serotonergic, Endocrinology, Reproductive Medicine, Internal medicine, medicine, Ovariectomized rat, Fenclonine, Serotonin receptor antagonist, Luteinizing hormone, medicine.drug
Abstract

Two photoperiod-controlled neuroendocrine systems appear to suppress secretion of tonic luteinizing hormone (LH) in anestrous ewes: a steroid-independent system that decreases LH pulse frequency in ovariectomized ewes and a steroid-dependent system whereby estradiol gains the capacity to suppress LH pulse frequency in anestrus. This study was designed to test the hypothesis that serotonergic neurons inhibit LH pulse frequency in ovariectomized ewes and to examine the possible interaction of this system with the steroid-dependent inhibition of LH pulse frequency in the anestrous season. In Experiment 1, i.v. injection of serotonin receptor antagonist, methysergide, significantly increased LH pulse frequency in ovariectomized ewes during the anestrous season. In Experiment 2, we examined the effects of oral administration of parachlorophenylalanine for 5 days on the synthesis of serotonin. This treatment significantly increased LH pulse frequency in ovariectomized ewes, but had no effect on the negative feedback action of estradiol. These data support the hypothesis that a serotonergic neural system mediates the steroid-independent inhibition of LH pulse frequency in anestrous ewes and suggest that this system is not absolutely essential for the functioning of the steroid-dependent system responsible for the negative feedback action during the anestrous season.

Published
1990

37. Growth, reproductive performance, and manganese status of heifers fed varying concentrations of manganese

Author

S L, Hansen, J W, Spears, K E, Lloyd, and C S, Whisnant

Subjects
Manganese, Dose-Response Relationship, Drug, Reproduction, Dietary Supplements, Animals, Animal Nutritional Physiological Phenomena, Cattle, Female, Animal Feed, Diet, Trace Elements
Abstract

An experiment was conducted to examine the effects of dietary Mn on growth, reproductive performance, and Mn status of beef heifers. Eighty Angus (n = 40) and Simmental (n = 40) heifers, averaging 249 kg, were stratified by BW within a breed and randomly assigned to 1 of 4 treatments providing 0 (control), 10, 30, or 50 mg of supplemental Mn/kg of DM from MnSO(4). Heifers were individually fed a diet containing cottonseed hulls, corn gluten feed, citrus pulp, and ground corn, and the control diet contained 15.8 mg of Mn/kg of DM by analysis. Average daily gain, DMI, and G:F for the 196-d period were not affected by Mn supplementation. Control heifers had reduced (P = 0.04) liver Mn when contrasted with the 3 levels of supplemental Mn. Serum cholesterol was greater (P = 0.001) in Angus compared with Simmental heifers over the course of the 196-d experiment but was not affected by treatment. Dietary Mn did not significantly affect measures of reproductive performance. Results of this study indicate that 15.8 mg of Mn/kg of diet DM should be adequate for growth, onset of estrus, and conception of beef heifers.

Published
2006

38. DOUBLE-POLARIZATION OBSERVABLES IN PION-PHOTOPRODUCTION FROM POLARIZED HD AT LEGS

Author

H. Ströher, M. Khandaker, A. Caracappa, A. D'Angelo, L. Miceli, S. Kizilgul, X. Wei, T. Kageya, C. Schaerf, A. Fantini, R. Di Salvo, S. Kucuker, S. Hoblit, C. S. Whisnant, H. Glückler, M. Blecher, K. Wang, A. Lehmann, A. M. Sandorfi, M. Lowry, J. Mahon, B. M. Preedom, B. E. Norum, C. Gibson, R. A. Lindgren, M. Lucas, M. Pap, H. Seyfarth, F. Lincoln, A. Honig, D. Moricciani, K. Ardashev, C. E. Thorn, C. Bade, O. C. Kistner, and K. Hicks

Subjects
Physics, Particle physics, Pion, Polarization observables
Published
2006

39. Singleπ+electroproduction on the proton in the first and second resonance regions at0.25GeV2<Q2<0.65GeV2

Author

J. Kuhn, Shifeng Chen, R. J. Feuerbach, Roy Thompson, R. W. Gothe, K. Y. Kim, C. Cetina, Y. Kuang, V. Gyurjyan, J. Zhang, E. Anciant, Michael Vineyard, M. Guidal, G. E. Dodge, H. Bagdasaryan, E. Polli, F. W. Hersman, G. Gavalian, K. S. Egiyan, G. Niculescu, Daijin Kim, Min Suk Kim, S. Stepanyan, P. V. Degtyarenko, L. M. Qin, Sylvain Bouchigny, N. Benmouna, M. Ripani, M. Khandaker, K. A. Griffioen, G. Ricco, K. Mikhailov, P. Rossi, M. Holtrop, H. Denizli, Elton Smith, P. Eugenio, M. Taiuti, Philip L. Cole, Ji Li, F. Ronchetti, K. Livingston, E. DeSanctis, G. V. O'Rielly, M. Klusman, M. Anghinolfi, James Mueller, I. Niculescu, Moshe Gai, A. V. Skabelin, E. Wolin, I. G. Aznauryan, I. Hleiqawi, P. D. Rubin, Y. G. Sharabian, J. P. Cummings, D. G. Jenkins, Friedrich Klein, Victor Mokeev, D. Lawrence, S. L. Careccia, S. Simionatto, M. D. Mestayer, Alexei V. Klimenko, K. Sabourov, M. Osipenko, J. Langheinrich, R. DeVita, J. D. Kellie, J. W C McNabb, R. S. Hicks, Brian Raue, J. Lachniet, P. Stoler, J. R. Calarco, L. C. Smith, S. J. Gaff, B. S. Ishkhanov, S. A. Philips, Barry Ritchie, K. Beard, P. Dragovitsch, Dinko Pocanic, M. Kossov, G. T. Goetz, D. Rowntree, Rakhsha Nasseripour, S. McAleer, S. O. Nelson, K. L. Giovanetti, B. Asavapibhop, M. Spraker, Larry Weinstein, L. Guo, M. Ungaro, J. J. Melone, Bernhard Mecking, K. Hicks, S. E. Kuhn, B. Carnahan, F. Sabatié, Latifa Elouadrhiri, W. Kim, K. V. Dharmawardane, D. Doughty, D. Heddle, J. P. Ball, Y. Prok, R. C. Minehart, Cynthia Marie Hadjidakis, C. A. Meyer, B. B. Niczyporuk, J. H. Kelley, S. Niccolai, G. V. Fedotov, C. Tur, Shalev Gilad, Thierry Auger, Michael Dugger, N. Guler, S. Boiarinov, B. M. Preedom, A. Tkabladze, R. S. Hakobyan, O. P. Dzyubak, Daniel S. Carman, Susan Taylor, S. Strauch, G. A. Peterson, H. O. Funsten, M. Eckhause, D. P. Weygand, J. W. Price, J. Hardie, N. Pivnyuk, J. Napolitano, A. Longhi, G. Audit, K. Joo, C. E. Hyde-Wright, R. A. Niyazov, J. Yun, D. Cords, H. Egiyan, A. Yegneswaran, J. P. Santoro, P. Corvisiero, M. Sargsyan, A.V. Stavinsky, N. Baltzel, Hall Crannell, S. A. Morrow, S. Barrow, L. C. Dennis, B. E. Bonner, C. S. Whisnant, C. Djalali, D. J. Tedeschi, C. Marchand, Gerald Feldman, R. A. Schumacher, H. Avakian, J. Hu, M. Nozar, A. Coleman, L. Todor, M. Battaglieri, H. R. Weller, P. Ambrozewicz, K. Wang, C. Salgado, D. Protopopescu, S. Pozdniakov, C. I O Gordon, R. Bradford, K. Lukashin, D. G. Crabb, G. S. Mutchler, Z. L. Zhou, G. Rosner, J. Donnely, A. Shafi, L. Morand, T. A. Forest, W. J. Briscoe, E. Pasyuk, Avraham Klein, S. A. Dytman, G. S. Adams, Y. Ilieva, M. Bellis, K. Park, M. M. Ito, R. Fatemi, A. V. Vlassov, V. P. Kubarovsky, A. Empl, O. Pogorelko, J. J. Manak, Patrick Girard, J. Shaw, Michael Wood, V. S. Serov, Nicola Bianchi, D. I. Sober, L. Y. Murphy, S. Mehrabyan, Kwangsoo Kim, G. Riccardi, C. Butuceanu, Laird Kramer, M. Bektasoglu, D. G. Ireland, Volker D. Burkert, Jing Zhao, A. S. Biselli, R. A. Miskimen, B. McKinnon, H. G. Juengst, D. Branford, M. Mirazita, J. M. Laget, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, U. Thoma, M. Guillo, I. I. Strakovsky, and W. K. Brooks

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Hadron, Resonance, Sigma, 01 natural sciences, 7. Clean energy, Helicity, Particle identification, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The ep {yields} e'pi{sup +}n reaction was studied in the first and second nucleon resonance regions in the 0.25 GeV{sup 2} < Q{sup 2} < 0.65 GeV{sup 2} range using the CLAS detector at Thomas Jefferson National Accelerator Facility. For the first time the absolute cross sections were measured covering nearly the full angular range in the hadronic center-of-mass frame. The structure functions {sigma}{sub TL}, {sigma}{sub TT} and the linear combination {sigma}{sub T} + {epsilon}{sigma}{sub L} were extracted by fitting the {phi}-dependence of the measured cross sections, and were compared to the MAID and Sato-Lee models.

Published
2006

40. Erratum: Radiative decays of theΣ0(1385)andΛ(1520)hyperons [Phys. Rev. C71, 054609 (2005)]

Author

A. V. Vlassov, T. Lee, M. Spraker, Michael Vineyard, G. V. O'Rielly, B. E. Stokes, G. S. Adams, D. G. Jenkins, B. S. Raue, J. P. Santoro, R. DeVita, J. W C McNabb, L. Todor, Roy Thompson, Kwangsoo Kim, G. Riccardi, C. Butuceanu, D. Protopopescu, S. Pozdniakov, M. Garçon, E. Wolin, J. P. Ball, Y. Prok, D. S. Carman, D. G. Crabb, Yordanka Ilieva, Ji Li, W. Kim, J. P. Cummings, R. A. Schumacher, L. Elouadrhiri, M. Kossov, Rakhsha Nasseripour, K. S. Egiyan, I. I. Strakovsky, V. Koubarovski, C. I O Gordon, M. Bellis, K. Mikhailov, M. M. Ito, M. Nozar, A. Deur, E. De Sanctis, L. Morand, T. A. Forest, S. Stepanyan, Federico Ronchetti, D. I. Sober, A. Empl, O. Pogorelko, L. C. Dennis, B. E. Bonner, G. Ricco, G. S. Mutchler, H. Avakian, V. Batourine, C. A. Meyer, E. Golovatch, G. Asryan, S. Bültmann, B. Carnahan, O. P. Dzyubak, R. A. Niyazov, W. J. Briscoe, E. Pasyuk, F. Sabatié, J. D. Kellie, S. A. Dytman, M. D. Mestayer, J. J. Manak, P. Corvisiero, M. Anghinolfi, U. Thoma, H. R. Weller, G. E. Dodge, Frank Klein, James Mueller, P. V. Degtyarenko, K. Kim, K. V. Dharmawardane, L. C. Smith, J. Shaw, D. P. Weygand, Michael Wood, Y. G. Sharabian, S. A. Morrow, P. Stoler, I. Niculescu, A. Shafi, P. Rubin, C. Djalali, S. Boiarinov, D. Lawrence, M. Guillo, J. Langheinrich, K. Hicks, V. S. Serov, M. Osipenko, S. A. Philips, Shifeng Chen, William Brooks, G. Rosner, Hall Crannell, H. Denizli, V. Sapunenko, C. Marchand, Valeria Muccifora, B. L. Berman, M. Battaglieri, L. M. Qin, P. Ambrozewicz, F. W. Hersman, H. Juengst, A. I. Ostrovidov, A. C S Lima, K. Park, Gerard Gilfoyle, E. Polli, M. Klusman, R. W. Gothe, G. Audit, C. E. Hyde-Wright, A. V. Skabelin, R. J. Feuerbach, Dinko Pocanic, M. Bektasoglu, Alexei V. Klimenko, R. Bradford, B. A. Mecking, Volker D. Burkert, A. S. Biselli, S. E. Kuhn, Cynthia Marie Hadjidakis, B. M. Preedom, M. Guidal, Barry Ritchie, G. Niculescu, P. Eugenio, Stephen Taylor, S. McAleer, M. Taiuti, K. A. Griffioen, Michael Dugger, M. Holtrop, H. O. Funsten, B. B. Niczyporuk, S. Strauch, J. J. Melone, Laird Kramer, D. G. Ireland, N. Pivnyuk, Lorenzo Zana, J. R. Calarco, K. Lukashin, J. Napolitano, R. A. Miskimen, Carlos A. Salgado, D. Branford, J. Hu, Gerald Feldman, M. Mirazita, J. M. Laget, K. Wang, N. Benmouna, M. Ripani, E. S. Smith, Marco A. Huertas, Sylvain Bouchigny, P. Rossi, Mark Richard James Williams, P. Dragovitsch, S. Niccolai, J. Hardie, A.V. Stavinsky, D. J. Tedeschi, K. Beard, Andreas Klein, G. Gavalian, V. Mokeev, D. Doughty, D. Heddle, J. Lachniet, A. Tkabladze, H. Egiyan, E. Anciant, C. S. Whisnant, D. Rowntree, M. Khandaker, V. Gyurjyan, K. Livingston, R. S. Hakobyan, N. Guler, H. Bagdasaryan, J. W. Price, L. Guo, S. Barrow, M. Ungaro, I. Hleiqawi, K. Joo, J. Yun, D. Cords, S. S. Stepanyan, A. Yegneswaran, R. G. Fersch, S. Simionatto, P. L. Cole, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, Clarisse Tur, Jens H. Kuhn, Nicola Bianchi, R. Suleiman, and R. Fatemi

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Hyperon, Radiative decay, Radiative transfer, Sigma, Lambda, Particle identification
Published
2005

41. FROZEN-SPIN POLARIZED HD TARGET FOR SPIN ASYMMETRY EXPERIMENTS

Author

C. Gibson, M. Pap, X. Wei, C. Bade, H. Glückler, H. Seyfarth, A. M. Sandorfi, H. Ströher, T. Kageya, M. Lowry, J. Mahon, F. Lincoln, and C. S. Whisnant

Subjects
Physics, Condensed matter physics, Spin polarization, media_common.quotation_subject, Spin (physics), Asymmetry, media_common
Published
2005

42. Radiative decays of theΣ0(1385)andΛ(1520)hyperons

Author

P. Dragovitsch, G. Gavalian, R. DeVita, M. Guidal, N. Benmouna, M. Ripani, S. Niccolai, J. W C McNabb, Hall Crannell, M. Holtrop, E. Anciant, Alexei V. Klimenko, J. Hardie, S. Strauch, C. Marchand, J. P. Cummings, M. Kossov, Rakhsha Nasseripour, R. A. Miskimen, H. G. Juengst, S. A. Morrow, R. Fatemi, Federico Ronchetti, M. Khandaker, Barry Ritchie, D. Branford, R. A. Schumacher, C. Djalali, A. V. Vlassov, Ji Li, T. Lee, Daniel S. Carman, Cynthia Marie Hadjidakis, Marco A. Huertas, M. Mirazita, J. M. Laget, A.V. Stavinsky, M. Bellis, C. I O Gordon, G. Audit, G. Ricco, Michael Dugger, P. Ambrozewicz, C. E. Hyde-Wright, M. D. Mestayer, G. Asryan, H. O. Funsten, D. J. Tedeschi, K. Livingston, L. Morand, T. A. Forest, C. S. Whisnant, Michael L. Williams, I. Hleiqawi, O. P. Dzyubak, R. A. Niyazov, A. I. Ostrovidov, V. Sapunenko, A. C S Lima, S. Boiarinov, S. Stepanyan, Avraham Klein, Sylvain Bouchigny, B. M. Preedom, S. Simionatto, G. V. O'Rielly, J. Hu, Dinko Pocanic, P. Corvisiero, M. Bektasoglu, D. G. Ireland, M. Nozar, P. Rossi, B. B. Niczyporuk, J. J. Manak, L. C. Smith, Lorenzo Zana, J. P. Santoro, J. Kuhn, K. L. Giovanetti, B. Asavapibhop, Friedrich Klein, H. Denizli, G. E. Dodge, D. G. Jenkins, M. Spraker, Larry Weinstein, B. S. Raue, N. Pivnyuk, Volker D. Burkert, A. S. Biselli, D. Doughty, J. Napolitano, R. J. Feuerbach, Gerald Feldman, M. Battaglieri, R. G. Fersch, K. Wang, S. E. Kuhn, P. Stoler, J. Langheinrich, P. V. Degtyarenko, K. Kim, D. Heddle, C. Salgado, S. McAleer, Laird Kramer, B. L. Berman, L. M. Qin, Hovanes Egiyan, Roy Thompson, S. S. Stepanyan, S. A. Philips, J. Lachniet, R. Bradford, K. Lukashin, I. Niculescu, D. Rowntree, A. V. Skabelin, C. Tur, Stephen Taylor, K. Hicks, N. Guler, D. Lawrence, K. S. Egiyan, E. De Sanctis, V. Gyurjyan, M. Klusman, V. Koubarovski, Michael Vineyard, Valeria Muccifora, R. S. Hakobyan, K. Mikhailov, L. Todor, Shifeng Chen, J. W. Price, J. R. Calarco, H. Bagdasaryan, V. Batourine, D. I. Sober, B. Carnahan, L. Guo, M. Ungaro, Gerard Gilfoyle, P. L. Cole, S. Barrow, P. Eugenio, Bernhard Mecking, E. Polli, K. V. Dharmawardane, M. Taiuti, Elton Smith, J. Yun, D. Cords, H. R. Weller, M. Anghinolfi, A. Yegneswaran, G. Rosner, James Mueller, P. D. Rubin, Y. G. Sharabian, C. A. Meyer, Y. Ilieva, J. J. Melone, A. Tkabladze, D. P. Weygand, Nicola Bianchi, M. M. Ito, K. A. Griffioen, D. Protopopescu, S. Pozdniakov, M. Garçon, A. Shafi, B. E. Stokes, G. S. Adams, J. D. Kellie, K. Joo, R. Suleiman, G. S. Mutchler, M. Guillo, E. Golovatch, L. Elouadrhiri, I. I. Strakovsky, A. Deur, W. K. Brooks, M. Osipenko, F. Sabatié, K. Beard, W. Kim, G. Niculescu, F. W. Hersman, R. W. Gothe, K. Y. Kim, U. Thoma, V. Mokeev, S. Bültmann, E. Wolin, J. P. Ball, Y. Prok, D. G. Crabb, G. Riccardi, C. Butuceanu, K. Park, A. Empl, O. Pogorelko, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, J. Shaw, Michael Wood, and V. S. Serov

Subjects
Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Lambda, Lambda baryon, 01 natural sciences, Particle identification, Sigma baryon, Nuclear physics, Baryon, Particle decay, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The electromagnetic decays of the Sig0(1385) and Lambda(1520) hyperons were studied in photon-induced reactions gamma p -> K+ Lambda(1116)gamma in the CLAS detector at the Thomas Jefferson National Accelerator Facility. We report the first observation of the radiative decay of the Sig0(1385) and a measurement of the Lambda(1520) radiative decay width. For the Sig0(1385) -> Lambda(1116)gamma transition, we measured a partial width of 479+/-120(stat)+81-100(sys) keV, larger than all of the existing model predictions. For the Lambda(1520) -> Lambda(1116)gamma transition, we obtained a partial width of 167+/-43(stat)+26-12(sys) keV.

Published
2005

43. Pigs weaned from the sow at 10 days of age respond to dietary energy source of manufactured liquid diets and exogenous porcine somatotropin

Author

W T, Oliver, K J, Touchette, J A, Coalson, C S, Whisnant, J A, Brown, S A Mathews, Oliver, J, Odle, and R J, Harrell

Subjects
Leptin, Male, Time Factors, Swine, Weaning, Weight Gain, Animal Feed, Dietary Fats, Blood Urea Nitrogen, Diet, Random Allocation, Growth Hormone, Animals, Female, Insulin-Like Growth Factor I
Abstract

Previous research indicates that the neonatal pig does not alter feed intake in response to changes in the energy density of manufactured liquid diets. Also, the limited response of IGF-I to exogenous porcine ST (pST) previously observed in young pigs may be influenced by the source of dietary energy. Our objectives were to 1) determine the effect of a high-fat (HF; 25% fat and 4,639 kcal/kg ME; DM basis) or low-fat (LF; 2% fat and 3,481 kcal/kg ME; DM basis) manufactured liquid diet on pig performance; and 2) determine whether the limited response to exogenous pST in young pigs depends on the source of dietary energy. Two replicates of 60 pigs (n = 120; barrows and gilts distributed evenly), with an initial BW of 4,207 +/- 51 g, were weaned from the sow at 10 d of age and used in a randomized complete block design. Pigs were assigned by BW to one of six pens. Diets were formulated to provide a constant lysine:ME ratio and were fed on a pen basis for a duration of 9 d. On d 5, barrows and gilts within a pen were assigned randomly to receive either 0 or 120 microg of pST.kg BW(-1).d(-1) for 4 d. Pigs gained 336 +/- 9 g/d, which resulted in an ending BW of 7,228 +/- 120 g, regardless of dietary treatment (P0.15). Pigs fed the LF diet consumed 17% more DM per pen daily than pigs fed the HF diet (2,777 +/- 67 vs. 2,376 +/- 67 g/d, P0.01), but calculated ME intake did not differ between dietary treatments (P0.20). The G:F was 24% greater in HF- than in LF-fed pigs (P0.01). Plasma urea N concentrations were higher in the HF-fed pigs (11.0 +/- 0.6 mg/dL) than in pigs fed the LF diet (6.2 +/- 0.6 mg/dL; P0.05). Treatment with pST increased circulating IGF-I (P0.01) and decreased PUN (P0.01) concentration 32 and 25%, respectively, regardless of dietary treatment (P0.30). Circulating leptin averaged 1.8 +/- 0.1 ng/mL and was not affected by dietary treatment (P0.35) or pST (P0.40). These results suggest that the ST/IGF axis is responsive in the young pig and the increase in circulating IGF-I and growth is independent of the source of dietary energy. Also, young pigs respond to a lower energy density liquid diet with increased feed intake, without altering growth performance, apparently utilizing a mechanism other than circulating leptin.

Published
2005

44. Complete measurement of three-body photodisintegration ofHe3for photon energies between 0.35 and1.55GeV

Author

J. P. Ball, Y. Prok, Alexei V. Klimenko, J. R. M. Annand, R. A. Miskimen, H. G. Juengst, L. Guo, M. Ungaro, Barry Ritchie, M. M. Ito, D. Branford, P. Stoler, M. Mirazita, J. M. Laget, A. I. Ostrovidov, A. C S Lima, D. Doughty, A.V. Stavinsky, S. McAleer, Cynthia Marie Hadjidakis, P. Eugenio, K. Joo, A. Coleman, B. B. Niczyporuk, D. G. Crabb, L. C. Smith, D. J. Tedeschi, S. Strauch, N. Pivnyuk, R. A. Schumacher, Marco A. Huertas, R. A. Niyazov, J. Yun, D. Cords, D. Heddle, M. Bellis, J. Napolitano, Dinko Pocanic, Ji Li, M. Guidal, Federico Ronchetti, Michael Dugger, K. Hicks, S. Pozdniakov, Volker D. Burkert, A. S. Biselli, J. P. Cummings, M. Taiuti, S. Stepanyan, Sylvain Bouchigny, K. A. Griffioen, S. E. Kuhn, C. I O Gordon, H. O. Funsten, P. Rossi, J. Hu, G. S. Adams, A. Shafi, J. W. Price, M. D. Mestayer, G. Ricco, M. Holtrop, A. Yegneswaran, D. G. Ireland, H. Denizli, L. Morand, Si Chen, J. R. Calarco, C. Tur, Rolf Ent, R. DeVita, J. W C McNabb, M. Battaglieri, B. L. Berman, T. A. Forest, Michael L. Williams, M. Kossov, S. A. Morrow, C. Djalali, L. M. Qin, P. Heimberg, Andrei Afanasev, I. Popa, K. Livingston, E. De Sanctis, R. Bradford, K. Lukashin, J. D. Kellie, Susan Taylor, P. Ambrozewicz, J. J. Melone, Friedrich Klein, S. Boiarinov, B. M. Preedom, R. J. Feuerbach, L. Y. Murphy, O. P. Dzyubak, Avraham Klein, Brian Raue, Y. Kuang, Daniel S. Carman, V. Gyurjyan, John T. O'Brien, M. Klusman, E. Polli, Laird Kramer, Lorenzo Zana, J. P. Santoro, G. V. O'Rielly, G. Audit, C. E. Hyde-Wright, D. I. Sober, C. S. Whisnant, Elton Smith, J. R. Ficenec, Bernhard Mecking, P. Dragovitsch, K. V. Dharmawardane, Y.Y. Llieva, U. Thoma, N. Guler, D. Protopopescu, H. Bagdasaryan, H. S. Jo, D. G. Jenkins, M. Anghinolfi, Gerald Feldman, Latifa Elouadrhiri, James Mueller, S. Niccolai, Hall Crannell, P. Corvisiero, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, K. Wang, P. D. Rubin, C. Marchand, Y. G. Sharabian, R. C. Minehart, C. Salgado, R. Fatemi, C. A. Meyer, J. Kuhn, G. V. Fedotov, G. Riccardi, B. Carnahan, G. E. Dodge, M. Bektasoglu, C. Armstrong, F. Sabatié, A. V. Vlassov, J. Hardie, M. Guillo, S. Barrow, K. S. Egiyan, P. V. Degtyarenko, K. Kim, M. Khandaker, M. Nozar, C. Butuceanu, I. Niculescu, P. L. Cole, D. Lawrence, Roy Thompson, R. Naseripour, K. Mikhailov, D. P. Weygand, R. Suleiman, A. V. Skabelin, J. Lachniet, J. Langheinrich, G. S. Mutchler, Michael Vineyard, D. Rowntree, L. Todor, S. A. Philips, G. Gavalian, N. Benmouna, M. Ripani, J. J. Manak, R. S. Hakobyan, E. Golovatch, Nicola Bianchi, K. Hleiqawi, G. Rosner, I. I. Strakovsky, W. K. Brooks, M. Osipenko, K. Beard, Kalvir S. Dhuga, L. C. Dennis, B. E. Bonner, W. Kim, G. Niculescu, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, K. Park, A. Empl, O. Pogorelko, F. W. Hersman, J. Shaw, Michael Wood, V. S. Serov, R. W. Gothe, K. Y. Kim, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, Hovanes Egiyan, R. Tkabladze, and E. Wolin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Spectrometer, 010308 nuclear & particles physics, Hadron, 7. Clean energy, 01 natural sciences, Baryon, Nuclear physics, Momentum, Massless particle, Photodisintegration, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The three-body photodisintegration of 3He has been measured with the CLAS detector at Jefferson Lab, using tagged photons of energies between 0.35 GeV and 1.55 GeV. The large acceptance of the spectrometer allowed us for the first time to cover a wide momentum and angular range for the two outgoing protons. Three kinematic regions dominated by either two- or three-body contributions have been distinguished and analyzed. The measured cross sections have been compared with results of a theoretical model, which, in certain kinematic ranges, have been found to be in reasonable agreement with the data.

Published
2004

45. Proton Source Size Measurements in theeA→e′ppXReaction

Author

R. A. Schumacher, P. Eugenio, M. Taiuti, C. I O Gordon, Daniel S. Carman, Sylvain Bouchigny, L. Morand, T. A. Forest, G. Audit, C. E. Hyde-Wright, C. A. Meyer, Muccifora, P. Rossi, H. Bagdasaryan, S. Stepanyan, Enzo De Sanctis, G. Asryan, F. Ronchetti, O. P. Dzyubak, R. A. Niyazov, Avraham Klein, M. Bellis, K. Park, L. M. Qin, I. Hleiqawi, A. Tkabladze, S. McAleer, Shifeng Chen, P. Corvisiero, J. Lachniet, D. Rowntree, R. S. Hakobyan, Susan Taylor, D. P. Weygand, R. Fatemi, A. V. Vlassov, K. S. Egiyan, K. Mikhailov, M. Bektasoglu, M. Nozar, S. Simionatto, M. Klusman, E. Polli, B. E. Stokes, G. S. Adams, A. Empl, O. Pogorelko, K. Lukashin, T. Lee, L. C. Smith, G. E. Dodge, Cynthia Marie Hadjidakis, H. Egiyan, K. Joo, Mokeev, K. L. Giovanetti, B. Asavapibhop, B. B. Niczyporuk, N. Pivnyuk, J. Kuhn, Elton Smith, M. Guidal, Chaden Djalali, Daijin Kim, Alexei V. Klimenko, Michael Dugger, M. Spraker, Larry Weinstein, J. W. Price, M. Anghinolfi, C. Cetina, J. Napolitano, Roy Thompson, James Mueller, C. S. Whisnant, Patrick Girard, J. Shaw, P. V. Degtyarenko, K. Kim, Strakovsky, Barry Ritchie, H. O. Funsten, Michael Vineyard, L. Guo, M. Ungaro, L. Todor, R. W. Gothe, S. A. Morrow, M. Holtrop, J. J. Manak, Michael Wood, Raffaella De Vita, V. S. Serov, E. Anciant, P. D. Rubin, Y. G. Sharabian, B. E. Bonner, H. Avakian, Ji Li, R Lednicky, Dinko Pocanic, S. Mehrabyan, K. Y. Kim, G. V. O'Rielly, Thierry Auger, M. Khandaker, Bernhard Mecking, K. V. Dharmawardane, H. Denizli, E. Pasyuk, S. E. Kuhn, D. G. Jenkins, K. Sabourov, J. Langheinrich, U. Thoma, S. S. Stepanyan, S. A. Philips, S. A. Dytman, G. S. Mutchler, G. Riccardi, I. Niculescu, D. Lawrence, Calarco, P. Stoler, C. Butuceanu, J. H. Kelley, G. Ricco, A.V. Stavinsky, D. Doughty, Michael L. Williams, C. Tur, Sapunenko, J. Yun, D. Cords, A. Yegneswaran, D. Heddle, S. Boiarinov, B. M. Preedom, N. Dashyan, R. G. Fersch, A. V. Skabelin, D. I. Sober, P. L. Cole, LS Vorobeyev, Lorenzo Zana, J. P. Santoro, S. O. Nelson, N. Benmouna, M. Ripani, K. Hicks, K. A. Griffioen, K. Wang, J. J. Melone, Friedrich Klein, C. Salgado, J. D. Kellie, Brian Raue, F. W. Hersman, E. Wolin, D. J. Tedeschi, Mestayer, J. P. Ball, Y. Prok, A. Coleman, H. R. Weller, J. P. Cummings, C. Marchand, M. Kossov, D. G. Crabb, Rakhsha Nasseripour, J. Hu, Shalev Gilad, J. W C McNabb, G. Rosner, M. Battaglieri, P. Dragovitsch, S. Niccolai, L.C. Dennis, R. Bradford, J. Hardie, M. Osipenko, F. Sabatié, M. M. Ito, K. Beard, G. Gavalian, Kubarovski, Gyurjyan, W. Kim, G. Niculescu, Batourine, Gerard Gilfoyle, Kim, R. A. Miskimen, H. G. Juengst, G.A. Leksin, D. Branford, M. Mirazita, J. M. Laget, P Ambrozewich, D. Protopopescu, S. Pozdniakov, M. Garçon, A. I. Ostrovidov, D. G. Ireland, Volker D. Burkert, A. S. Biselli, Nicola Bianchi, K. Livingston, N. Guler, G. A. Peterson, R. J. Feuerbach, Laird Kramer, S. Barrow, M. Guillo, L. Elouadrhiri, A. Deur, and W. K. Brooks

Subjects
Nuclear reaction, Baryon, Physics, Proton, Helium-3, Hadron, General Physics and Astronomy, Atomic physics, Nucleon, Isotopes of helium, Lepton
Abstract

Two-proton correlations at small relative momentum q were studied in the e A ( 3 H e , 4 H e , C , F e ) → e ′ p p X reaction at E 0 = 4.46 G e V using the CLAS detector at Jefferson Lab. The enhancement of the correlation function at small q was found to be in accordance with theoretical expectations. Sizes of the emission region were extracted, and proved to be dependent on A and on the proton momentum. The size of the two-proton emission region for He was measured in e A reactions for the first time.

Published
2004

46. Survey of A_LT' asymmetries in semi-exclusive electron scattering on He4 and C12

Author

L. Elouadrhiri, J. Kuhn, V. Sapunenko, Valeria Muccifora, Roy Thompson, R. Fatemi, D. Doughty, P. Dragovitsch, M. Battaglieri, Gerard Gilfoyle, D. Heddle, A. V. Vlassov, T. Lee, J. R. Calarco, S. Niccolai, R. Bradford, Y.G. Sharabian, M. Osipenko, F. Sabatié, B. M. Preedom, Shalev Gilad, R. A. Miskimen, J. Hardie, H. G. Juengst, W. K. Brooks, K. Beard, Ji Li, Lorenzo Zana, J. P. Santoro, M. D. Mestayer, G. Ricco, Kalvir S. Dhuga, Michael L. Williams, M. Guidal, S. Boiarinov, A. I. Ostrovidov, E. Wolin, K. Wang, D. Branford, Dimitri Debruyne, C. Salgado, M. M. Ito, G. Gavalian, J. J. Manak, D. G. Ireland, R. C. Minehart, J. P. Ball, S. Stepanyan, M. Mirazita, J. M. Laget, Y. Prok, I. Hleiqawi, S. Simionatto, Volker D. Burkert, A. S. Biselli, G. E. Dodge, C. A. Meyer, D. Protopopescu, M. Holtrop, Bernhard Mecking, A.V. Stavinsky, K. S. Egiyan, P. Eugenio, M. Taiuti, Cynthia Marie Hadjidakis, C. Cetina, K. A. Griffioen, Michael Vineyard, L. Todor, W. Ingram, K. V. Dharmawardane, K. L. Giovanetti, B. Asavapibhop, Friedrich Klein, S. Pozdniakov, P. V. Degtyarenko, A. Tkabladze, Michael Dugger, Brian Raue, D. G. Crabb, M. Spraker, Larry Weinstein, William Bertozzi, E. Anciant, M. Guillo, D. J. Tedeschi, K. Mikhailov, D. P. Weygand, H. O. Funsten, E. De Sanctis, J. D. Kellie, A. Coleman, H. R. Weller, B. Carnahan, I. Niculescu, Sylvain Bouchigny, W. Kim, S. McAleer, G. Niculescu, M. Khandaker, R. J. Feuerbach, D. I. Sober, D. Lawrence, J. J. Melone, Daniel S. Carman, Alexei V. Klimenko, P. Rossi, G. Rosner, Laird Kramer, G. Audit, Thierry Auger, C. E. Hyde-Wright, Barry Ritchie, R. A. Schumacher, L. C. Smith, Susan Taylor, S. Strauch, H. Egiyan, Federico Ronchetti, C. I O Gordon, Kwangsoo Kim, G. Riccardi, J. Hu, G. S. Mutchler, G. Asryan, Nicola Bianchi, C. Butuceanu, S. McLauchlan, B. E. Stokes, G. S. Adams, K. Joo, L. Morand, T. A. Forest, K. Livingston, O. P. Dzyubak, R. A. Niyazov, C. S. Whisnant, B. L. Berman, N. Guler, U. Thoma, Avraham Klein, G. A. Peterson, A. V. Skabelin, M. Bektasoglu, L. M. Qin, F. W. Hersman, P. Corvisiero, P. L. Cole, S. Barrow, M. Nozar, Hall Crannell, M. Klusman, C. Marchand, N. Benmouna, M. Ripani, L. Guo, M. Ungaro, R. DeVita, P. Stoler, J. W C McNabb, J. Langheinrich, S. A. Philips, J. W. Price, S. O. Nelson, K. Hicks, R. W. Gothe, K. Y. Kim, J. Yun, D. Cords, A. Yegneswaran, G. V. O'Rielly, V. Gyurjyan, D. G. Jenkins, K. Sabourov, H. Bagdasaryan, B. B. Niczyporuk, N. Pivnyuk, J. Napolitano, S. A. Morrow, C. Djalali, P. Ambrozewicz, J. Lachniet, Jan Ryckebusch, D. Rowntree, R. S. Hakobyan, Patrick Girard, J. Shaw, Michael Wood, Baile Zhang, V. S. Serov, Shifeng Chen, M. Bellis, K. Park, E. Polli, Elton Smith, A. Empl, O. Pogorelko, M. Anghinolfi, K. Lukashin, L. C. Dennis, B. E. Bonner, James Mueller, H. Avakian, P. D. Rubin, J. P. Cummings, M. Kossov, Dinko Pocanic, W. J. Briscoe, E. Pasyuk, S. A. Dytman, Rakhsha Nasseripour, S. E. Kuhn, J. H. Kelley, C. Tur, 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), and CLAS

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, FOS: Physical sciences, Comparisons with model predictions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 4He, single spin azimuthal asymmetries vs missing momentum, 01 natural sciences, NUCLEON EMISSION, missing energy, Nuclear physics, 12C (polarised e, deduced, 0103 physical sciences, e′p), Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Spin-½, Physics, NUCLEAR REACTIONS, POLARIZED ELECTRONS, E'P REACTIONS, 010308 nuclear & particles physics, Scattering, POLARIZED ELECTRONS, NUCLEON EMISSION, E'P REACTIONS, KNOCKOUT, Helicity, Eikonal approximation, KNOCKOUT, 24.70.+s, 25.30.Dh, 27.10.+h, measured, final state interaction effects, High Energy Physics::Experiment, Nucleon, Glauber, Electron scattering, E=2.261, 4.461 GeV
Abstract

Single spin azimuthal asymmetries A_LT' were measured at Jefferson Lab using 2.2 and 4.4 GeV longitudinally polarized electrons incident on He4 and C12 targets in the CLAS detector. A_LT' is related to the imaginary part of the longitudinal-transverse interference and in quasifree nucleon knockout it provides an unambiguous signature for final state interactions (FSI). Experimental values of A_LT' were found to be below 5%, typically |A_LT'| < 3% for data with good statistical precision. Optical Model in Eikonal Approximation (OMEA) and Relativistic Multiple-Scattering Glauber Approximation (RMSGA) calculations are shown to be consistent with the measured asymmetries., 9 pages, 5 figures

Published
2004

47. Onset of asymptotic scaling in deuteron photodisintegration

Author

P. Rossi, M. Mirazita, F. Ronchetti, E. De Sanctis, G. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Audit, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, W. Bertozzi, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, S. Chen, P. L. Cole, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, R. De Vita, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deppman, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, H. Funsten, M. Gai, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, C. I. O. Gordon, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, Y. Ilieva, M. M. Ito, D. Jenkins, H. S. Jo, K. Joo, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, J. Kuhn, S. E. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, Ji Li, A. C. S. Lima, K. Livingston, K. Lukashin, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, S. Mehrabyan, J. J. Melone, M. D. Mestayer, C. A. Meyer, K. Mikhailov, R. Miskimen, V. Mokeev, L. Morand, S. A. Morrow, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, J. T. O'Brien, G. V. O'Rielly, M. Osipenko, A. Ostrovidov, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, G. Rosner, D. Rowntree, P. D. Rubin, F. Sabatié, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, S. Simionatto, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, B. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, A. Tkabladze, L. Todor, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, B. Zhang, and Z. Zhou

Subjects
Physics, Proton, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Strong interaction, 2-BODY PHOTODISINTEGRATION, FOS: Physical sciences, General Physics and Astronomy, Photon energy, High Energy Physics - Experiment, Nuclear physics, Momentum, Baryon, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Photodisintegration, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, Nucleon
Abstract

We investigate the transition from the nucleon-meson to quark-gluon description of the strong interaction using the photon energy dependence of the $d(\gamma,p)n$ differential cross section for photon energies above 0.5 GeV and center-of-mass proton angles between $30^{\circ}$ and $150^{\circ}$. A possible signature for this transition is the onset of cross section $s^{-11}$ scaling with the total energy squared, $s$, at some proton transverse momentum, $P_T$. The results show that the scaling has been reached for proton transverse momentum above about 1.1 GeV/c. This may indicate that the quark-gluon regime is reached above this momentum., Comment: Accepted by PRL; 5 pages, 2 figures

Published
2004

48. Tensor polarization of theϕmeson photoproduced at hight

Author

J. P. Cummings, M. Kossov, J. Langheinrich, M. Bektasoglu, Rakhsha Nasseripour, S. A. Philips, P. Dragovitsch, Jing Zhao, Daniel S. Carman, P. Stoler, M. Osipenko, K. Beard, G. Audit, C. E. Hyde-Wright, J. Lachniet, Dinko Pocanic, S. Niccolai, S. E. Kuhn, L. C. Dennis, S. O. Nelson, K. Hicks, J. H. Kelley, C. Tur, D. Rowntree, B. E. Bonner, Hall Crannell, Susan Taylor, S. McAleer, J. Hardie, G. Gavalian, M. Guillo, J. Kuhn, H. Egiyan, H. Avakian, B. M. Preedom, W. Major, R. S. Hakobyan, O. P. Dzyubak, R. A. Niyazov, C. Marchand, M. Guidal, G. Niculescu, Roy Thompson, R. A. Schumacher, R. A. Miskimen, M. Holtrop, H. G. Juengst, P. Corvisiero, E. Anciant, C. S. Whisnant, J. P. Santoro, C. I O Gordon, G. A. Peterson, D. J. Tedeschi, W. Kim, K. S. Egiyan, F. W. Hersman, E. Pasyuk, S. Barrow, L. Morand, T. A. Forest, M. Mirazita, J. M. Laget, P. Eugenio, M. Taiuti, S. A. Dytman, B. Carnahan, F. Sabatié, M. Khandaker, R. J. Feuerbach, K. Wang, T. Smith, C. Salgado, L. Farhi, Thierry Auger, Volker D. Burkert, A. S. Biselli, U. Thoma, Avraham Klein, G. S. Adams, D. Hancock, G. Ricco, K. Joo, G. E. Dodge, Patrick Girard, B. L. Berman, J. Shaw, V. Gyurjyan, D. Doughty, Nicola Bianchi, Michael Wood, V. Sapunenko, L. M. Qin, Valeria Muccifora, Philip L. Cole, P. V. Degtyarenko, V. S. Serov, Laird Kramer, A. Coleman, D. Heddle, H. R. Weller, C. Cetina, Gerard Gilfoyle, L. Todor, Moshe Gai, M. Klusman, Michael Vineyard, M. Bellis, K. Park, D. Protopopescu, M. Garçon, J. W. Price, I. Niculescu, Z. L. Zhou, H. Bagdasaryan, J. J. Melone, D. Lawrence, Friedrich Klein, R. S. Hicks, Brian Raue, A. Shafi, Ji Li, L. Guo, M. Ungaro, M. D. Mestayer, O. Pogorelko, W. K. Brooks, F. Ronchetti, V. Frolov, S. Boiarinov, J. Yun, D. Cords, K. L. Giovanetti, B. Asavapibhop, M. Spraker, Larry Weinstein, A. Yegneswaran, L. C. Smith, S. J. Gaff, D. G. Jenkins, K. Sabourov, Cynthia Marie Hadjidakis, Michael Dugger, M. Nozar, E. De Sanctis, H. O. Funsten, M. M. Ito, D. I. Sober, A. V. Vlassov, J. J. Manak, S. Mehrabyan, Elton Smith, J. R. Ficenec, M. Anghinolfi, James Mueller, K. McCormick, P. D. Rubin, Y. G. Sharabian, C. Butuceanu, Shifeng Chen, E. Wolin, Y. Kuang, E. Polli, J. P. Ball, Y. Prok, M. Eckhause, M. Sargsyan, Latifa Elouadrhiri, D. G. Crabb, R. C. Minehart, C. A. Meyer, D. P. Weygand, N. Benmouna, M. Ripani, H. Denizli, J. Connelly, A. V. Skabelin, Alexei V. Klimenko, Barry Ritchie, M. Battaglieri, R. Bradford, K. Lukashin, S. Strauch, J. R. Calarco, M. Witkowski, Bernhard Mecking, K. V. Dharmawardane, G. S. Mutchler, K. A. Griffioen, S. Stepanyan, Sylvain Bouchigny, P. Rossi, G. Riccardi, R. DeVita, J. W C McNabb, S. A. Morrow, C. Djalali, Shalev Gilad, P. Ambrozewicz, M. Sanzone-Arenhovel, B. B. Niczyporuk, N. Pivnyuk, and J. Napolitano

Subjects
Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Momentum transfer, Hadron, Quarkonium, Phi meson, 01 natural sciences, Helicity, Nuclear physics, Particle decay, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics
Abstract

As part of a measurement [E. Anciant et al., Phys. Rev. Lett. 85, 4682 (2000)] of the cross section of phi meson photoproduction to high momentum transfer, we measured the polar angular decay distribution of the outgoing K+ in the channel K+K- in the phi center-of-mass frame (the helicity frame). We find that phi s-channel helicity conservation (SCHC) holds in the kinematical range where t-channel exchange dominates (up to -t {approx}2.5 GeV2 for E = 3.6 GeV). Above this momentum, phi u-channel production of a meson dominates and induces a violation of SCHC. The deduced value of the phi NN coupling constant lies in the upper range of previously reported values.

Published
2004

49. Publisher’s Note: Two-Nucleon Momentum Distributions Measured inHe3(e,e′pp)n[Phys. Rev. Lett.PRLTAO0031-900792, 052303 (2004)]

Author

K. A. Griffioen, Shifeng Chen, G. Gavalian, S. McAleer, Y. Kuang, J. Langheinrich, Cynthia Marie Hadjidakis, S. A. Philips, E. Wolin, E. Polli, Michael Dugger, R. DeVita, H. O. Funsten, J. W C McNabb, S. Strauch, J. P. Ball, Y. Prok, P. L. Cole, D. S. Carman, Dinko Pocanic, V. Gyurjyan, H. Bagdasaryan, J. W. Price, Min Suk Kim, J. R. Calarco, R. A. Schumacher, Frank Klein, S. E. Kuhn, J. P. Cummings, J. Hu, C. A. Meyer, G. S. Mutchler, J. H. Kelley, Stephen Taylor, R. Fatemi, Carlos A. Salgado, C. I O Gordon, Patrick Girard, J. Shaw, Federico Ronchetti, G. Audit, C. E. Hyde-Wright, S. A. Morrow, P. Rubin, M. Eckhause, C. Djalali, A. V. Vlassov, D. G. Crabb, L. Ciciani, M. Nozar, Michael Wood, G. V. O'Rielly, R. J. Feuerbach, J. Lachniet, L. Morand, D. Rowntree, M. Kossov, T. A. Forest, V. S. Serov, G. Ricco, S. Stepanyan, P. Ambrozewicz, H. Juengst, M. Osipenko, J. R. Ficenec, M. Bektasoglu, Rakhsha Nasseripour, N. Dashyan, D. G. Jenkins, M. Bellis, K. Sabourov, M. Anghinolfi, K. Park, Shalev Gilad, S. Simionatto, E. S. Smith, James Mueller, K. Beard, R. S. Hakobyan, E. De Sanctis, P. Eugenio, L. C. Smith, B. Carnahan, G. E. Dodge, F. Sabatié, D. P. Weygand, M. Guidal, Y. G. Sharabian, Sylvain Bouchigny, Yordanka Ilieva, D. I. Sober, P. Dragovitsch, Ji Li, Brian Raue, P. Rossi, G. Niculescu, Daijin Kim, P. V. Degtyarenko, K. Kim, Volker D. Burkert, A. S. Biselli, B. B. Niczyporuk, W. Kim, M. Taiuti, N. Pivnyuk, K. L. Giovanetti, B. Asavapibhop, S. Niccolai, A. Empl, O. Pogorelko, M. Holtrop, M. D. Mestayer, J. J. Manak, Clarisse Tur, K. Lukashin, J. Napolitano, L. C. Dennis, I. Niculescu, D. Lawrence, Laird Kramer, Alexei V. Klimenko, Larry Weinstein, B. E. Bonner, Thierry Auger, J. Hardie, H. Avakian, G. Asryan, O. P. Dzyubak, R. A. Niyazov, N. Benmouna, M. Ripani, D. Doughty, K. V. Dharmawardane, S. Boiarinov, S. Mehrabyan, Barry Ritchie, D. Heddle, Kwangsoo Kim, G. Riccardi, William Brooks, Hall Crannell, C. Butuceanu, P. Corvisiero, M. Spraker, C. Cetina, Michael Vineyard, J. D. Kellie, K. S. Dhuga, C. Marchand, B. M. Preedom, J. J. Melone, William Bertozzi, E. Anciant, B. L. Berman, L. M. Qin, E. Pasyuk, M. Khandaker, K. Wang, J. P. Santoro, M. Klusman, S. A. Dytman, Roy Thompson, M. Battaglieri, P. Stoler, A. Coleman, S. O. Nelson, H. Denizli, H. R. Weller, K. Hicks, K. S. Egiyan, R. Bradford, B. A. Mecking, K. Mikhailov, A. V. Skabelin, M. M. Ito, H. Egiyan, S. McLauchlan, C. S. Whisnant, G. S. Adams, L. Todor, D. Protopopescu, S. Pozdniakov, A. Shafi, U. Thoma, Jens H. Kuhn, Nicola Bianchi, K. Livingston, W. Ingram, F. W. Hersman, G. A. Peterson, M. Guillo, S. Barrow, R. W. Gothe, L. Elouadrhiri, R. A. Miskimen, I. I. Strakovsky, L. Guo, M. Ungaro, K. Joo, D. Branford, J. Yun, D. Cords, A. Yegneswaran, M. Mirazita, J. M. Laget, V. Sapunenko, Valeria Muccifora, A.V. Stavinsky, D. J. Tedeschi, Gerard Gilfoyle, Andreas Klein, and Baile Zhang

Subjects
Physics, Momentum (technical analysis), General Physics and Astronomy, Few-body systems, Nucleon, Mathematical physics
Published
2004

50. Two-Nucleon Momentum Distributions Measured inHe3(e,e′pp)n

Author

S. A. Morrow, C. Djalali, Ji Li, P. Ambrozewicz, M. D. Mestayer, E. Wolin, Susan Taylor, L. C. Smith, S. Strauch, P. Eugenio, M. Bellis, K. Park, S. McLauchlan, J. P. Ball, Y. Prok, H. Denizli, S. Boiarinov, M. Taiuti, M. Eckhause, G. S. Mutchler, C. S. Whisnant, Dinko Pocanic, G. S. Adams, Bernhard Mecking, K. V. Dharmawardane, Sylvain Bouchigny, R. Fatemi, G. Gavalian, Cynthia Marie Hadjidakis, P. Rossi, J. Hu, D. G. Crabb, A. V. Vlassov, A. V. Skabelin, Shalev Gilad, A. Empl, Michael Dugger, O. Pogorelko, H. O. Funsten, G. Riccardi, R. J. Feuerbach, S. E. Kuhn, M. Guidal, K. Lukashin, M. Battaglieri, G. Niculescu, Daijin Kim, J. R. Calarco, R. DeVita, J. W C McNabb, J. J. Manak, S. Mehrabyan, R. Bradford, Hall Crannell, Alexei V. Klimenko, P. Stoler, C. Cetina, Michael Vineyard, M. Holtrop, Barry Ritchie, J. H. Kelley, C. Marchand, J. P. Cummings, L. Guo, M. Ungaro, B. M. Preedom, C. Tur, S. O. Nelson, R. A. Schumacher, B. Carnahan, C. Butuceanu, F. Sabatié, L.C. Dennis, B. B. Niczyporuk, K. A. Griffioen, K. Hicks, M. M. Ito, Patrick Girard, J. Shaw, E. De Sanctis, M. Kossov, C. I O Gordon, U. Thoma, N. Dashyan, J. P. Santoro, J. Kuhn, N. Pivnyuk, M. Osipenko, Michael Wood, D. I. Sober, Rakhsha Nasseripour, K. S. Egiyan, Thierry Auger, J. Napolitano, Roy Thompson, J. Langheinrich, S. A. Philips, C. A. Meyer, K. Beard, L. Morand, T. A. Forest, V. S. Serov, B. E. Bonner, S. Stepanyan, Elton Smith, J. R. Ficenec, H. Avakian, K. Mikhailov, Kalvir S. Dhuga, K. Wang, G. V. O'Rielly, J. D. Kellie, Avraham Klein, R. W. Gothe, C. Salgado, G. E. Dodge, M. Anghinolfi, D. P. Weygand, Daniel S. Carman, P. V. Degtyarenko, K. Kim, James Mueller, B. L. Berman, G. Audit, C. E. Hyde-Wright, E. Pasyuk, L. M. Qin, S. A. Dytman, I. Niculescu, D. Lawrence, P. D. Rubin, N. Benmouna, M. Ripani, Y. G. Sharabian, G. Asryan, O. P. Dzyubak, R. A. Niyazov, M. Klusman, K. Joo, D. G. Jenkins, K. Sabourov, J. Yun, D. Cords, A. Coleman, Baile Zhang, H. R. Weller, P. Corvisiero, M. Nozar, K. Y. Kim, Shifeng Chen, A. Yegneswaran, Y. Kuang, S. McAleer, E. Polli, W. Ingram, V. Gyurjyan, Laird Kramer, H. Bagdasaryan, M. Guillo, Min Suk Kim, J. W. Price, L. Elouadrhiri, I. I. Strakovsky, J. Lachniet, F. W. Hersman, W. K. Brooks, D. Rowntree, M. Bektasoglu, R. S. Hakobyan, D. Doughty, Volker D. Burkert, A. S. Biselli, D. Heddle, William Bertozzi, Hovanes Egiyan, E. Anciant, V. Sapunenko, G. Ricco, Valeria Muccifora, Philip L. Cole, P. Dragovitsch, M. Khandaker, S. Niccolai, J. J. Melone, Friedrich Klein, J. Hardie, Gerard Gilfoyle, Brian Raue, A.V. Stavinsky, D. J. Tedeschi, L. Todor, R. A. Miskimen, H. G. Juengst, D. Protopopescu, L. Ciciani, Federico Ronchetti, D. Branford, S. Pozdniakov, S. Simionatto, M. Mirazita, J. M. Laget, K. L. Giovanetti, B. Asavapibhop, A. Shafi, M. Spraker, Larry Weinstein, Y. Ilieva, Nicola Bianchi, K. Livingston, G. A. Peterson, S. Barrow, and W. Kim

Subjects
Nuclear reaction, Physics, Particle physics, Nuclear Theory, Momentum transfer, General Physics and Astronomy, Kinetic energy, Nuclear physics, Momentum, Baryon, Pair production, Nuclear Experiment, Nucleon, Lepton
Abstract

We have measured the 3He(e,e'pp)n reaction at 2.2 GeV over a wide kinematic range. The kinetic energy distribution for ''fast'' nucleons (p > 250 MeV/c) peaks where two nucleons each have 20% or less, and the third nucleon has most of the transferred energy. These fast pp and pn pairs are back-to-back with little momentum along the three-momentum transfer, indicating that they are spectators. Experimental and theoretical evidence indicates that we have measured distorted two-nucleon momentum distributions by striking the third nucleon and detecting the spectator correlated pair.

Published
2004

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