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1. Hyperon Resonance Photoproduction at CLAS

Author: K.H. Hicks, W. Tang, and D. Keller
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Phenomenology, Nuclear Theory, Hyperon, Resonance, Atomic and Molecular Physics, and Optics, Nuclear physics, Baryon, Isospin, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The study of hyperon resonances has entered a new era of precision with advent of high-statistics photoproduction data from the CLAS detector at Jefferson Lab. These data have multi-particle final states, allowing clean identification of exclusive reactions associated with strange mesons and baryons. Examples of physics results are: evidence for isospin interference in the decay of the Λ ( 1405 ) resonance; a strong suggestion of meson cloud effects in the structure of the Σ ( 1385 ) resonance; data from K ⁎ photoproduction that will test the existence of the purported K 0 ( 800 ) meson. Properties of other hyperon resonances will also be studied in the near future.
Published: 2011

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

Author: R. A. Schumacher, G. V. O'Rielly, C. D. Keith, Cynthia Marie Hadjidakis, Z. W. Zhao, Chaden Djalali, D. G. Jenkins, Michael Dugger, S. Tkachenko, H. O. Funsten, A. I. Ostrovidov, A. C S Lima, S. Bültmann, L. Morand, M. R. Niroula, T. A. Forest, D. G. Ireland, G. Asryan, Volker D. Burkert, A. S. Biselli, J. Pierce, Elton Smith, M. J. Amaryan, M. MacCormick, O. P. Dzyubak, R. A. Niyazov, I. Hleiqawi, S. L. Careccia, Larry Weinstein, Avraham Klein, E. Golovatch, H. G. Juengst, K. Moriya, Daniel S. Carman, J. Kuhn, Philip L. Cole, S. McAleer, H. Hakobyan, S. Anefalos Pereira, P. D. Rubin, L. Blaszczyk, P. Corvisiero, Y. G. Sharabian, A. Fradi, L. Cheng, G. Audit, A.V. Stavinsky, C. E. Hyde-Wright, F. Sabatié, Nikolay Shvedunov, D. Heddle, P. Stoler, Friedrich Klein, J. P. Cummings, R. De Vita, N. Markov, V. Sapunenko, C. Salgado, Dinko Pocanic, L. Elouadrhiri, N. Kalantarians, S. Stepanyan, K. S. Egiyan, R. C. Minehart, C. A. Meyer, J. Ball, M. Taiuti, S. E. Kuhn, I. I. Strakovsky, M. Bektasoglu, M. Kossov, K. Mikhailov, K.H. Hicks, R. J. Feuerbach, G. V. Fedotov, M. Nozar, A. Deur, I. Popa, V. Crede, J. W. Price, Shifeng Chen, M. Anghinolfi, Laird Kramer, D. P. Watts, H. Egiyan, G. Gavalian, John A. Mueller, L. Casey, B. L. Berman, P. Mattione, B. B. Niczyporuk, G. Rosner, N. Benmouna, N. Pivnyuk, Kwangsoo Kim, J. T. Goetz, M. Mirazita, G. Riccardi, J. R. Calarco, R. A. Miskimen, B. A. Raue, B. McKinnon, W. J. Briscoe, L. M. Qin, R. G. Fersh, P. Eugenio, J. Langheinrich, C. Butuceanu, C. Hanretty, S. S. Stepanyan, E. Pasyuk, S. A. Philips, M. Ripani, G. Ricco, S. A. Morrow, C. Paterson, Y. Ilieva, Michael Vineyard, Victor Mokeev, M. Klusman, B. M. Preedom, D. Branford, P. Collins, B. Moreno, J. R. Johnstone, Lorenzo Zana, J. P. Santoro, Tsutomu Mibe, Gerald Feldman, J. M. Laget, L. Todor, D. Protopopescu, K. L. Giovanetti, S. V. Kuleshov, C. Marchand, S. Pozdniakov, M. Garçon, M. L. Seely, Ji Li, D. J. Tedeschi, G. E. Dodge, H. Y. Lu, J. Lachniet, I. Bedlinskiy, Marco A. Huertas, A. Tkabladze, M. D. Mestayer, E. L. Isupov, P. V. Degtyarenko, D. Rowntree, K. Livingston, Michael L. Williams, M. Holtrop, R. Suleiman, V. Kuznetsov, D. S. Dale, J. Zhang, S. Boiarinov, D. I. Sober, Gerard Gilfoyle, F. X. Girod, G. S. Mutchler, N. A. Baltzell, I. Niculescu, D. Sokhan, J. Salamanca, K. A. Griffioen, D. Lawrence, M. Guillo, N. Guler, R. De Masi, L. El Fassi, J. W C McNabb, Sylvain Bouchigny, H. Denizli, M. Guidal, M. Battaglieri, J. Hardie, S. Strauch, J. D. Kellie, Z. Krahn, R. Nasseripour, S. Barrow, P. Rossi, R. Dickson, N. Baillie, D. Doughty, V. Gyurjyan, R. Bradford, K. Lukashin, B. E. Stokes, G. S. Adams, H. Bagdasaryan, P. Nadel-Turonski, A. V. Skabelin, K. Joo, A. Cazes, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, L. Guo, M. Ungaro, D. P. Weygand, E. Wolin, N. Hassall, M. Bellis, D. G. Crabb, J. Yun, D. Cords, P. Bosted, A. Yegneswaran, N. Dashyan, Y. Prok, Barry Ritchie, E. De Sanctis, H. S. Jo, S. Niccolai, R. Fatemi, A. V. Vlassov, P. Coltharp, R. W. Gothe, M. M. Ito, K. Y. Kim, M. Osipenko, K. Beard, L. C. Smith, E. Munevar, Kalvir S. Dhuga, B. S. Ishkhanov, O. Pogorelko, M. Khandaker, B. Zhao, F. W. Hersman, W. Kim, G. Niculescu, N. Gevorgyan, L. C. Dennis, B. E. Bonner, H. Avakian, D. Sharov, S. A. Dytman, W. K. Brooks, K. Park, V. P. Kubarovsky, J. Shaw, Michael Wood, K. Hafidi, and V. S. Serov
Subjects: Physics, Nuclear and High Energy Physics, Chiral perturbation theory, Heavy baryon chiral perturbation theory, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, 01 natural sciences, Baryon, Nuclear physics, Polarizability, 0103 physical sciences, Sum rule in quantum mechanics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The spin structure functions g 1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q 2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH3 and ND3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 Q 2 5 GeV 2 and W 3 GeV . The first moments of g 1 for the proton and deuteron are presented – both have a negative slope at low Q 2 , as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ 0 p is also reported. This quantity shows strong Q 2 dependence at low Q 2 . Our analysis of the Q 2 evolution of the first moment of g 1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ 0 p data and Chiral Perturbation calculations for γ 0 p , even at the lowest Q 2 .
Published: 2009

3. Elusive Pentaquark Comes into View

Author: K.H. Hicks
Subjects: Physics, Quark, Particle physics, Meson, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Strong interaction, Bottom quark, Pentaquark, Standard Model, Nuclear physics, Baryon, Strange matter, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The proton is made from three quarks, and mesons are made from a quark and antiquark. But what other configurations of quarks and antiquarks can form a particle? From a theoretical standpoint, this question is difficult to answer. Yet new particles with different combinations of quarks keep popping up in experiments. The latest of these, reported by the Large Hadron Collider Beauty (LHCb) Collaboration at CERN, is the pentaquark, a never-before-seen combination of five quarks that consists of a proton and a pair of heavy charm-anticharm quarks [1]. The detection of this particle comes as somewhat of a surprise: although the existence of the pentaquark doesn’t require a revision of the standard model of particle physics, earlier searches for a pentaquark composed of lighter quarks came up empty or detected candidate particles that could not be reproduced [2]. From studying this new form of quark matter, physicists stand to learn more about the complex forces between bound quarks. The concept of multiquark particles is not new [3]. But for decades after the quark model was conceived, only two categories of strongly interacting particles were known: baryons (such as protons and neutrons), consisting of three quarks, and mesons. Only within the past decade have scientists started to observe new particles that do not fit into the quark model, such as the X(3872) [4] and the Zc(3900) (see 17 June 2013 Viewpoint), which are about 4 times heavier than the proton. The Zc(3900) decays into a charm-anticharm meson (called the J/ψ), plus a light meson, suggesting the particle is made from two quarks and two antiquarks. The observation of this four-quark state—or tetraquark—implied that other multiquark states, such as a heavy pentaquark, might exist [5]. The challenge has been looking for them. Rare particles are the proverbial needle in the haystack, as scientists must hunt for them in the copious debris from high-energy collisions. In the LHCb experiment, two protons collide at very high energy, sometimes producing composite particles that have a heavy bottom quark and which stay close to the beam line. The bottom-quark particles go a short distance and then decay into other particles, such as a pentaquark plus a K meson, which are then picked up by a series of detectors. The key step that allowed LHCb’s detector to identify the candidate pentaquark was to only look for products of the bottom-quark particle Λb, which has a lifetime long enough for it to move away from the proton-proton collision point before it decays. Using the Λb decay as a filter, the researchers were able to see two new pentaquarks—or, rather, the products of their decays—sufficiently far from other confounding particle debris. Both pentaquarks that LHCb has observed are resonant-energy states of the proton and the J/ψ particle and are therefore referred to as “charmonium pentaquarks.” More formally, they are named Pc(4450) and Pc(4380), where the numbers, according to convention, indicate the particles’ masses in mega-electron-volts. A natural question to ask is what other combination of quarks—besides the resonant state of a proton and J/ψ that the LHCb researchers assume—could form a pentaquark resonance? For example, over a decade ago, theorists predicted [6] that a pentaquark could be made from a proton and a φ meson—a pair of strange-antistrange quarks. But experimental searches never uncovered this type of pentaquark. Similarly, a resonant combination of the neutron and a K+ meson, called the Θ+pentaquark, was predicted almost two decades ago. But again, the particle’s existence wasn’t confirmed, despite extensive experimental searches. (The exception was a claim by the Laser Electron Photon experiment in Japan that has been hotly contested [2].) In fact, there are many combinations of quarks that can form a pentaquark, but the only one seen so far is the charmonium pentaquark found by LHCb. What makes it so special? The short answer is we don’t know. The forces between quarks are complex, and accurately describing a manyquark system using the theory of the strong force, quantum chromodynamics (QCD), is an extremely difficult
Published: 2015

4. DISCOVERY OF THE STRANGENESS S=+1 PENTAQUARK

Author: Takashi Nakano and K.H. Hicks
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson production, Exotic baryon, Hyperon, General Physics and Astronomy, Resonance, Astronomy and Astrophysics, Strangeness, Pentaquark
Abstract: The theoretical motivation to look for S=+1 resonances is introduced and searches for such states in the literature are reviewed. The motivation for the recent pentaquark searches is discussed and the experimental details are described for several positive results of the S=+1 resonance with a mass of approximately 1.54 GeV, now called the Θ+. Finally, some new theoretical proposals to explain the recent experimental results are briefly mentioned, followed by a short discussion of future experimental prospects to learn more about pentaquark states.
Published: 2004

5. Cascade photo production at CLAS

Author: K.H. Hicks and John Goetz
Subjects: Physics, Quark, Particle physics, High Energy Physics::Phenomenology, Nuclear Theory, Quark model, Detector, Omega, Baryon, Nuclear physics, Cascade, Excited state, High Energy Physics::Experiment, Photon beam, Nuclear Experiment
Abstract: The famous discovery of the Omega − in 1964 put the quark model on firm ground and since then a lot of effort has been spent on mapping out the baryonic and mesonic states. Over the following decades, many excited baryons with light quarks (up, down and strange) have been measured, but by most predictions, only a small percentage of those expected have been found. In this talk, I will discuss a newly developing technique using an (unflavored) photon beam to excite protons to doubly-strange "Cascade" (Xi) states. Advantages of such an experiment and associated difficulties will be presented, along with recent results from the CLAS detector at Jefferson Lab in Virginia.
Published: 2014

6. INPOL – the Indiana University Neutron Polarimeter

Author: T. Rinckel, C. Hautala, I. J. van Heerden, C. C. Foster, J. Rapaport, M. Palarczyk, X Yang, G. Savopulos, C. D. Goodman, D. Cooper, K.H. Hicks, T. N. Taddeucci, B. A. Luther, David L. Prout, D Yoder, and E. Sugarbaker
Subjects: Physics, Nuclear and High Energy Physics, Spin states, Astrophysics::High Energy Astrophysical Phenomena, Cyclotron, Polarimeter, Polarization (waves), law.invention, Nuclear physics, law, Physics::Accelerator Physics, Neutron, Nuclear Experiment, Instrumentation, Charge exchange
Abstract: We describe the upgraded time-of-flight facility at the Indiana University Cyclotron which has been used to measure the polarization transfer induced in ( p → , n → ) reactions at intermediate energies, Ep=100–200 MeV. The Indiana Neutron POLarimeter (INPOL) is able to measure simultaneously two orthogonal neutron spin polarizations induced in charge exchange reactions with polarized proton beams oriented in each of the three spin states, normal ( N → ), sideways ( S → ) and longitudinal ( L → ).
Published: 2001

7. The CLAS drift chamber system

Author: S. Dytman, Daniel S. Carman, G. Jacobs, S. Christo, S. E. Kuhn, R. Miskimen, M. Kossov, K.G. Vansyoc, J. W C McNabb, D. Tilles, C. Martin, W.S. Duncan, James Mueller, F. Roudot, R. A. Schumacher, R. A. Thompson, R. J. Feuerbach, G.R. Wilkin, Michael Vineyard, J. Yun, Avraham Klein, A. Yegneswaran, W. Tuzel, G. E. Dodge, F. Barbosa, B. B. Niczyporuk, V. Gyurjyan, R. W. Major, T. Dooling, M. D. Mestayer, B. A. Raue, B. Asavapibhop, R. Magahiz, Larry Weinstein, J.E. O'Meara, D. J. Tedeschi, P. Bonneau, C. E. Hyde-Wright, Friedrich Klein, R. S. Hicks, T McGuckin, J. Robb, K.H. Hicks, L. M. Qin, and Gerard Gilfoyle
Subjects: Physics, Nuclear and High Energy Physics, Toroid, Electromagnet, Spectrometer, business.industry, Superconducting magnet, Tracking (particle physics), Linear particle accelerator, Particle detector, law.invention, Nuclear physics, Optics, Planar, law, business, Instrumentation
Abstract: The CEBAF Large Acceptance Spectrometer at 12 GeV (CLAS12) is located in Hall B, one of the experimental halls at Jefferson Lab. The forward part of CLAS12 is built around a superconducting toroidal magnet. The six coils of the toroid divide the detector azimuthally into six sectors. Each sector contains three multi-layer drift chambers for reconstructing the trajectories of charged particles originating from a fixed target. Each of the 18 planar chambers has two “superlayers” of six layers each, with the wires in the two adjacent superlayers oriented at ± 6 ° stereo angles. Each layer has 112 hexagonal cells spanning a range from about 5 ° to 40 ° in polar angle. The six-layer structure provides redundancy in track segment finding and good tracking efficiency even in the presence of some individual wire inefficiency. The design, construction, operation, and calibration methods are described, and estimates of the efficiency and resolution are presented from in-beam measurements.
Published: 2000

8. Experiment at SPring-8

Author: T. Nakano, Y. Miyachi, Yoshihiro Asano, Hiroshi Toki, M. Sumihama, A. Wakai, S. C. Wang, K. Imai, T. Kishimoto, Takeshi Toyama, Hiroyuki Toyokawa, S. Daté, T. Ooba, C.W. Wang, K.H. Hicks, H. Ejiri, S. Makino, Atsushi Sakaguchi, Y. Ohashi, H. Kawai, T. Matsumura, Tsutomu Mibe, M. Fujiwara, N. Kumagai, Hidetoshi Akimune, Hajime Shimizu, N. Matsuoka, M. Yosoi, Y. Sugaya, Masaharu Nomachi, Atsushi Ichikawa, Tomoaki Hotta, Takahiro Iwata, and J. K. Ahn
Subjects: Quark, Physics, Nuclear and High Energy Physics, Photon, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Compton scattering, Physics::Optics, SPring-8, Electron, Laser, Polarization (waves), law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The GeV photon beam at SPring-8 is produced by backward-Compton scattering of laser photons from 8 GeV electrons. The maximum energy of the photon will be above 3 GeV, and the beam intensity will be 10 7 photons/sec. Polarization of the photon beam will be 100 % at the maximum energy with fully polarized laser photons. We report the outline of the quark nuclear physics project with this high-quality high-intensity beam.
Published: 2000

9. Measurement of a complete set of spin observables in the 2H(p,n)2p reaction at 200 MeV

Author: D. Cooper, B. Luther, Henryk Witała, K.H. Hicks, David L. Prout, R. Madey, W. Glöckle, W. M. Zhang, M. S. Islam, J. W. Watson, A. R. Baldwin, A. Ahmidouch, G. Savopulos, R. Suleiman, David Manley, B. D. Anderson, M. Palarczyk, J. Rapaport, I. Niculescu, X. Yang, E. Sugarbaker, C. Hautala, I.J. van Heerden, M. Khayat, J. Sowinski, and C. C. Foster
Subjects: Physics, Nuclear and High Energy Physics, Spin states, High intensity, Cyclotron, Observable, Polarization (waves), Ion source, law.invention, Nuclear physics, Transverse plane, law, Physics::Accelerator Physics, Neutron, Atomic physics, Nuclear Experiment
Abstract: A complete set of spin observables was measured for the 2 H(p,n)2p reaction at 200 MeV at the Indiana University Cyclotron Facility (IUCF) with the high intensity polarized ion source (HIPIOS) and the Indiana Neutron Polarization Facility (INPOL). The incident proton beam was delivered successively in each of the three spin states, normal ( N ), sideways ( S ), and longitudinal ( L ). Two large-volume neutron polarimeters placed along the 0° and 24° beam lines measured the polarizations of the emitted neutrons in each of the three spin states. The measured cross sections and spin observables are compared with three-body Faddeev calculations, which generally agree with the data. The ratio of the longitudinal to transverse response is suppressed rather than enhanced, as predicted by some models.
Published: 1998

10. Laser polarized muonic 3He and spin dependent μ− capture

Author: P. Bogorad, Albert Young, D. Tupa, H. Middleton, R. Holmes, P. Michaux, Paul Souder, J.C. Huang, J. McCracken, David A. Siegel, B. Larson, O. Häusser, X. Wang, Gordon D. Cates, K.H. Hicks, A. Gorelov, W. J. Cummings, Wolfgang Lorenzon, M. D. Hasinoff, E.J. Brash, K. S. Kumar, and E. Saettler
Subjects: Pseudoscalar, Nuclear physics, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Muon, law, Atomic physics, Laser, Instrumentation, Spin-½, law.invention, Polarized target
Abstract: We have developed an apparatus that can polarize muonic 3He and detect the triton from the reaction μ− + 3He → ν + 3H. With this apparatus, we have measured the vector analyzing power of the reaction. This technique promises to provide a good test of QCD.
Published: 1998

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

Author: Latifa Elouadrhiri, C. A. Meyer, K. P. Adhikari, E. Seder, K. Livingston, N. Dashyan, Y. Prok, H. S. Jo, P. Collins, P. Eugenio, M. Mayer, V. Kuznetsov, S. Niccolai, Daniel S. Carman, M. J. Amaryan, Y. Ilieva, R. G. Fersch, Z. W. Zhao, A. Deur, N. Guler, G. E. Dodge, H. Baghdasaryan, M. Guidal, H. Moutarde, J. Zhang, P. Rossi, P. Konczykowski, J. Salamanca, J. Ball, F. X. Girod, S. Park, Larry Weinstein, H. Seraydaryan, B. Vernarsky, D. Heddle, I. Niculescu, S. Procureur, D. Protopopescu, Michael Vineyard, B. Morrison, D. P. Watts, E. De Sanctis, S. Dhamija, Y. G. Sharabian, D. Martinez, S. Fegan, R. A. Schumacher, V. Crede, S. Stepanyan, R. Dickson, E. Voutier, M. Aghasyan, M. Taiuti, R. W. Gothe, B. Dey, N. Markov, H. Hakobyan, S. Anefalos Pereira, L. Guo, D. Doughty, M. Ungaro, D. Keller, R. Nasseripour, J. W. Price, S. S. Stepanyan, E. Pasyuk, M. R. Niroula, A. El Alaoui, B. A. Raue, M. Y. Gabrielyan, T. A. Forest, P. Nadel-Turonski, B. Zhao, S. Tkachenko, G. Ricco, Philip L. Cole, Avraham Klein, M. Ripani, T. Mineeva, S. S. Jawalkar, M. S. Saini, G. Rosner, G. Gavalian, D. J. Tedeschi, Friedrich Klein, I. Bedlinskiy, P. Bosted, E. Munevar, B. Moreno, M. Mirazita, M. Holtrop, C. Salgado, A. Daniel, Chaden Djalali, D. G. Crabb, S. E. Kuhn, M. E. McCracken, M. Anghinolfi, L. Casey, K. Moriya, N. Hassall, C. Hanretty, Y. Perrin, F. Sabatié, W. J. Briscoe, Victor Mokeev, K. Joo, K. L. Giovanetti, S. V. Kuleshov, H. Y. Lu, D. P. Weygand, M. Battaglieri, M. Osipenko, W. Kim, G. Niculescu, A. I. Ostrovidov, K. Park, D. G. Ireland, P. Khetarpal, Volker D. Burkert, A. S. Biselli, A. Fradi, R. De Vita, R. Suleiman, S. Pisano, K.H. Hicks, D. I. Sober, P. Stoler, K. A. Griffioen, S. Strauch, R. Paremuzyan, Gerard Gilfoyle, D. Sokhan, B. McKinnon, D. Branford, N. Gevorgyan, H. Avakian, W. K. Brooks, V. P. Kubarovsky, Annalisa D'Angelo, J. McAndrew, Michael Wood, K. Hafidi, E. L. Isupov, W. Gohn, R. Dupre, O. Pogorelko, M. Khandaker, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Meson, DRELL-YAN, Hadron, General Physics and Astronomy, FOS: Physical sciences, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, DEPENDENCE, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], SCATTERING, DISTRIBUTIONS, Nuclear Experiment (nucl-ex), 010306 general physics, FINAL-STATE INTERACTIONS, TRANSVERSE-MOMENTUM, AZIMUTHAL ASYMMETRIES, DRELL-YAN, SCATTERING, DISTRIBUTIONS, QUARK, DEPENDENCE, CLAS, QCD, Nuclear Experiment, Spin-½, Physics, FINAL-STATE INTERACTIONS, 010308 nuclear & particles physics, QUARK, TRANSVERSE-MOMENTUM, Deep inelastic scattering, AZIMUTHAL ASYMMETRIES, QCD, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, Lepton
Abstract: We report the first measurement of the transverse momentum dependence of double-spin asymmetries in semi-inclusive production of pions in deep-inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Jefferson Lab (JLab). Modulations of single spin asymmetries over the azimuthal angle between lepton scattering and hadron production planes phi have been measured over a wide kinematic range in Bjorken x and virtual photon squared four-momentum Q(2). A significant nonzero sin2 phi single spin asymmetry was observed for the first time indicating strong spin-orbit correlations for transversely polarized quarks in the longitudinally polarized proton.
Published: 2010

12. Search for a light neutral boson associated with beta decay

Author: K.H. Hicks and D. Alburger
Subjects: Physics, Nuclear and High Energy Physics, Decay scheme, Astrophysics::High Energy Astrophysical Phenomena, Bremsstrahlung, Scalar boson, Beta decay, Nuclear physics, Particle decay, Double beta decay, Beta particle, High Energy Physics::Experiment, Atomic physics, Boson
Abstract: A gamma-gamma coincidence measurement was performed in order to search for a neutral scalar particle associated with beta decay with a mass near 17 keV. The measurement used a 35 S source and two LEPS-type Ge detectors. A coincidence signal above the background generated by random bremsstrahlung coincidences would be a signature of the two-photon decay of a light neutral scalar particle. No evidence was found for such a particle with a mass near 17 keV with a lifetime shorter than 1 nanosecond.
Published: 1992

13. Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction

Author: L. Guo, M. Ungaro, D. P. Watts, H. Egiyan, L. C. Smith, E. Munevar, B. S. Ishkhanov, R. Nasseripour, R. A. Schumacher, P. Nadel-Turonski, D. Keller, M. E. McCracken, K. L. Giovanetti, S. V. Kuleshov, Daniel S. Carman, A. Deur, Gerard Gilfoyle, M. Y. Gabrielyan, P. Eugenio, O. Pogorelko, J. Zhang, F. X. Girod, V. E. Kuznetsov, H. Seraydaryan, Philip L. Cole, J. Salamanca, M. Khandaker, R. Dupré, Y. Ilieva, D. Sokhan, M. R. Niroula, T. A. Forest, F. Sabatié, Nikolay Shvedunov, Latifa Elouadrhiri, H. S. Jo, C. A. Meyer, B. Morrison, S. Procureur, S. Niccolai, N. Hassall, M. Bellis, A. I. Ostrovidov, K. Park, S. L. Careccia, G. V. Fedotov, B. McKinnon, B. Zhao, Friedrich Klein, J. Ball, Avraham Klein, C. Hanretty, V. Batourine, S. E. Kuhn, E. Golovatch, Charles Hyde, E. L. Isupov, D. G. Ireland, M. Taiuti, S. Park, Victor Mokeev, D. Branford, K. Joo, S. Fegan, S. S. Jawalkar, Volker D. Burkert, A. S. Biselli, Chaden Djalali, M. Osipenko, Inna Aznauryan, M. S. Saini, H. Hakobyan, S. Anefalos Pereira, C. Bookwalter, M. Anghinolfi, D. Heddle, M. Battaglieri, J. T. Goetz, V. Crede, M. Mirazita, J. W. Price, B. A. Raue, R. Suleiman, D. P. Weygand, S. Dhamija, H. Avakian, E. De Sanctis, D. I. Sober, G. Ricco, K. Moriya, R. W. Gothe, S. S. Stepanyan, E. Pasyuk, M. Mayer, R. De Vita, T. Mineeva, W. J. Briscoe, S. Pisano, Igor Strakovsky, K.H. Hicks, I. Niculescu, J. R. Johnstone, Laird Kramer, Y. Prok, H. Moutarde, Barry Ritchie, H. Y. Lu, D. J. Tedeschi, I. Bedlinskiy, S. Strauch, Larry Weinstein, M. Holtrop, W. Kim, G. Niculescu, P. Khetarpal, W. Gohn, Michael L. Williams, C. S. Nepali, L. Zana, G. Rosner, M. Ripani, B. Moreno, D. Protopopescu, S. Pozdniakov, K. Livingston, M. Guidal, P. Rossi, A. Daniel, P. Stoler, S. Tkachenko, R. Dickson, B. Dey, D. Doughty, W. K. Brooks, A. El Alaoui, J. McAndrew, Michael Wood, K. Hafidi, V. P. Kubarovsky, Annalisa D'Angelo, P. Collins, Michael Vineyard, K. P. Adhikari, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CLAS, and 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)
Subjects: Nuclear and High Energy Physics, Roper resonance, Particle physics, Meson, Nuclear Theory, Hadron, FOS: Physical sciences, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, TRANSITION FORM-FACTORS, RELATIVISTIC QUARK-MODEL, LIGHT-FRONT DYNAMICS, GAMMA-ASTERISK, NEUTRAL PIONS, HIGH-ENERGIES, REGION, PHOTOPRODUCTION, Q2, MESONS, Delta baryon, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), Pion, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, TRANSITION FORM-FACTORS, RELATIVISTIC QUARK-MODEL, LIGHT-FRONT DYNAMICS, GAMMA-ASTERISK, NEUTRAL PIONS, HIGH-ENERGIES, REGION, PHOTOPRODUCTION, Q2, MESONS, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics - Phenomenology, High Energy Physics::Experiment, Nucleon
Abstract: We present results on the electroexcitation of the low mass resonances Delta(1232)P33, N(1440)P11, N(1520)D13, and N(1535)S11 in a wide range of Q2. The results were obtained in the comprehensive analysis of JLab-CLAS data on differential cross sections, longitudinally polarized beam asymmetries, and longitudinal target and beam-target asymmetries for pion electroproduction off the proton. The data were analysed using two conceptually different approaches, fixed-t dispersion relations and a unitary isobar model, allowing us to draw conclusions on the model sensitivity of the obtained electrocoupling amplitudes. The amplitudes for the Delta(1232)P33} show the importance of a meson-cloud contribution to quantitatively explain the magnetic dipole strength, as well as the electric and scalar quadrupole transitions. They do not show any tendency of approaching the pQCD regime for Q2 N(1520)D13 and N(1535)S11 longitudinal helicity amplitudes with good precision., 23 pages, 17 figures
Published: 2009
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14. Light Vector Mesons in the Nuclear Medium

Author: V. Crede, S. McAleer, L. Blaszczyk, J. R. Calarco, B. L. Berman, E. De Sanctis, S. Tkachenko, M. Taiuti, R. A. Schumacher, Michael Wood, A. I. Ostrovidov, G. Asryan, C. I O Gordon, K. Hafidi, K. Park, C. Paterson, J. W. Price, O. P. Dzyubak, R. A. Niyazov, V. S. Serov, L. C. Dennis, D. G. Ireland, B. G. Ritchie, B. E. Stokes, J. Kuhn, M. R. Niroula, Cynthia Marie Hadjidakis, M. J. Amaryan, H. Avakian, M. MacCormick, I. Hleiqawi, Volker D. Burkert, G. S. Adams, S. L. Careccia, A. S. Biselli, S. Stepanyan, D. Sharov, A. V. Vlassov, Philip L. Cole, Larry Weinstein, J. Pierce, Avraham Klein, Chaden Djalali, K.H. Hicks, D. J. Tedeschi, K. Joo, Sylvain Bouchigny, G. S. Mutchler, Michael Dugger, W. Kim, Gerard Gilfoyle, D. Sokhan, H. S. Jo, K. S. Egiyan, J. Hardie, Friedrich Klein, J. P. Cummings, Laird Kramer, K. Livingston, S. A. Dytman, W. K. Brooks, B. Carnahan, S. Niccolai, H. O. Funsten, P. Collins, Ulrich Mosel, Z. W. Zhao, I. Bedlinskiy, H. G. Juengst, G. Niculescu, R. Nasseripour, K. Mikhailov, R. A. Miskimen, B. McKinnon, H. Hakobyan, S. Anefalos Pereira, D. G. Jenkins, P. Coltharp, Hall Crannell, A.V. Stavinsky, P. Eugenio, R. W. Gothe, V. Sapunenko, M. Bektasoglu, C. Salgado, Dinko Pocanic, M. M. Ito, D. Branford, V. Gyurjyan, P. Khetarpal, A. Fradi, M. Holtrop, M. Kossov, J. M. Laget, D. P. Weygand, Y. Ilieva, V. P. Kubarovsky, R. De Vita, L. C. Smith, E. Munevar, G. E. Dodge, B. S. Ishkhanov, P. Nadel-Turonski, H. Bagdasaryan, P. V. Degtyarenko, N. Guler, S. E. Kuhn, Federico Ronchetti, J. J. Melone, K. Moriya, C. Hanretty, I. Niculescu, D. Lawrence, J. D. Kellie, Victor Mokeev, J. R. Johnstone, L. Guo, M. Ungaro, Latifa Elouadrhiri, G. Rosner, J. Lachniet, A. Tkabladze, M. Guidal, A. Yegneswaran, R. C. Minehart, S. Barrow, C. Tur, P. Rossi, J. Langheinrich, S. S. Stepanyan, E. Pasyuk, J. Zhang, C. A. Meyer, S. Mehrabyan, F. X. Girod, Baile Zhang, G. V. Fedotov, G. Gavalian, R. S. Hakobyan, R. Dickson, M. Ripani, L. El Fassi, D. Doughty, Z. Krahn, N. Benmouna, G. Riccardi, B. A. Raue, M. Osipenko, C. Butuceanu, Tsutomu Mibe, L. Cheng, Shifeng Chen, N. Baillie, Daniel S. Carman, F. Sabatié, Nikolay Shvedunov, K. L. Giovanetti, S. V. Kuleshov, D. Protopopescu, G. Ricco, S. Pozdniakov, M. Garçon, E. Wolin, C. E. Hyde-Wright, O. Pogorelko, J. Ball, N. Kalantarians, M. Khandaker, D. G. Crabb, M. Nozar, B. Zhao, H. Denizli, H. Y. Lu, J. T. Goetz, F. W. Hersman, M. Mirazita, Elton Smith, N. Dashyan, James Mueller, Alexei V. Klimenko, Y. Prok, I. I. Strakovsky, Y. G. Sharabian, P. Muehlich, A. Deur, Ji Li, M. D. Mestayer, R. J. Feuerbach, E. L. Isupov, Michael L. Williams, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, S. Boiarinov, B. M. Preedom, Lorenzo Zana, J. P. Santoro, M. Battaglieri, D. P. Watts, H. Egiyan, Gerald Feldman, N. A. Baltzell, N. Markov, R. Bradford, K. A. Griffioen, N. Hassall, M. Bellis, J. Salamanca, P. Mattione, J. W C McNabb, M. Anghinolfi, L. Casey, B. B. Niczyporuk, Michael Vineyard, N. Pivnyuk, W. J. Briscoe, L. Todor, S. A. Morrow, S. Strauch, P. Ambrozewicz, P. Stoler, D. I. Sober, Thomas Jefferson National Accelerator Facility (Jefferson Lab), 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), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Particle physics, Rho meson, Meson, Nuclear Theory, FOS: Physical sciences, light vector mesons, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, chiral symmetry, Spectral line, Nuclear physics, ENHANCEMENT, CLAS, 0103 physical sciences, 11.30.Rd, 14.40.Cs, 24.85.+p, QCD SUM-RULES, Invariant mass, RHO-MESON, Nuclear Experiment (nucl-ex), 010306 general physics, in-medium modifications, Nuclear Experiment, Physics, AU COLLISIONS, QCD sum rules, CEBAF, 010308 nuclear & particles physics, QCD SUM-RULES, RHO-MESON, SPECTRAL-FUNCTION, AU COLLISIONS, OMEGA-MESONS, MATTER, CLAS, ENHANCEMENT, SYSTEM, CEBAF, Nuclear matter, SPECTRAL-FUNCTION, Deuterium, Mass spectrum, High Energy Physics::Experiment, MATTER, SYSTEM, OMEGA-MESONS
Abstract: The light vector mesons ($\rho$, $\omega$, and $\phi$) were produced in deuterium, carbon, titanium, and iron targets in a search for possible in-medium modifications to the properties of the $\rho$ meson at normal nuclear densities and zero temperature. The vector mesons were detected with the CEBAF Large Acceptance Spectrometer (CLAS) via their decays to $e^{+}e^{-}$. The rare leptonic decay was chosen to reduce final-state interactions. A combinatorial background was subtracted from the invariant mass spectra using a well-established event-mixing technique. The $\rho$ meson mass spectrum was extracted after the $\omega$ and $\phi$ signals were removed in a nearly model-independent way. Comparisons were made between the $\rho$ mass spectra from the heavy targets ($A > 2$) with the mass spectrum extracted from the deuterium target. With respect to the $\rho$-meson mass, we obtain a small shift compatible with zero. Also, we measure widths consistent with standard nuclear many-body effects such as collisional broadening and Fermi motion., Comment: 15 pages, 18 figures, 3 tables
Published: 2008

15. Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries

Author: G. Niculescu, Gerard Gilfoyle, K. Livingston, L. Blaszczyk, S. Tkachenko, I. I. Strakovsky, A. Deur, D. Sokhan, J. Donnelly, G. Asryan, O. P. Dzyubak, A. V. Vlassov, M. Taiuti, K. S. Egiyan, K. Mikhailov, T. Lee, Atilla Gonenc, G. E. Dodge, R. W. Gothe, J. W. Price, M. Guidal, P. Rossi, R. Dickson, V. Crede, D. Doughty, P. V. Degtyarenko, Daniel S. Carman, Alexei V. Klimenko, J. R. Calarco, M. Mazouz, R. Miskimen, J. Salamanca, Lorenzo Zana, J. Kuhn, M. Ripani, Philip L. Cole, J. P. Santoro, Y. Prok, Z. Krahn, Hovanes Egiyan, B. A. Raue, D. P. Watts, Barry Ritchie, O. Pogorelko, M. Khandaker, V. Batourine, C. Butuceanu, G. Ricco, I. Niculescu, R. A. Niyazov, H. Y. Lu, Friedrich Klein, D. Lawrence, E. Wolin, Z. W. Zhao, N. Markov, Elton Smith, Gerald Feldman, B. McKinnon, J. Ball, S. A. Morrow, N. Baillie, R. De Masi, J. P. Ball, M. Nozar, P. Eugenio, B. Zhao, D. Protopopescu, C. E. Hyde, S. Pozdniakov, M. Garçon, D. Branford, P. Stoler, Michael Wood, R. A. Schumacher, E. De Sanctis, M. J. Amaryan, J. M. Laget, K. Hafidi, P. Ambrozewicz, M. MacCormick, Y. Ilieva, B. Michel, V. S. Serov, D. G. Crabb, J. Langheinrich, E. Voutier, S. S. Stepanyan, E. Pasyuk, R. De Vita, I. Hleiqawi, M. Osipenko, M. Kossov, S. L. Careccia, B. E. Stokes, N. Guler, Sylvain Bouchigny, S. Bültmann, Tsutomu Mibe, M. Anghinolfi, M. R. Niroula, N. Dashyan, F. W. Hersman, L. C. Smith, E. Munevar, S. Stepanyan, L. Casey, K.H. Hicks, K. Joo, Y. G. Sharabian, Larry Weinstein, J. Pierce, Avraham Klein, Latifa Elouadrhiri, D. J. Tedeschi, B. L. Berman, B. S. Ishkhanov, I. Bedlinskiy, N. A. Baltzell, C. A. Meyer, V. P. Kubarovsky, G. V. Fedotov, Laird Kramer, P. Collins, David Jenkins, J. D. Kellie, B. B. Niczyporuk, K. L. Giovanetti, S. V. Kuleshov, C. Hanretty, M. Holtrop, C. Paterson, V. Sapunenko, Michael Vineyard, H. Avakian, D. Sharov, N. Pivnyuk, Dinko Pocanic, D. P. Weygand, W. J. Briscoe, H. S. Jo, K. A. Griffioen, A. I. Ostrovidov, K. Park, D. G. Ireland, S. E. Kuhn, M. D. Mestayer, Volker D. Burkert, A. S. Biselli, S. Niccolai, E. L. Isupov, Michael L. Williams, W. K. Brooks, S. Boiarinov, C. Tur, G. Rosner, P. Coltharp, Victor Mokeev, J. R. Johnstone, Shifeng Chen, J. Lachniet, M. M. Ito, L. Guo, P. Mattione, A. Tkabladze, J. T. Goetz, V. Gyurjyan, M. Mirazita, M. Ungaro, J. Zhang, F. X. Girod, S. Strauch, L. El Fassi, R. Nasseripour, P. Nadel-Turonski, D. I. Sober, G. S. Mutchler, H. Bagdasaryan, M. Bellis, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, G. Gavalian, M. Battaglieri, N. Benmouna, R. Bradford, Chaden Djalali, Michael Dugger, H. O. Funsten, K. Moriya, Carlos A. Salgado, L. Cheng, F. Sabatié, Nikolay Shvedunov, A. Yegneswaran, N. Kalantarians, H. G. Juengst, H. Hakobyan, S. Anefalos Pereira, A.V. Stavinsky, W. Kim, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), 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), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), CLAS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)
Subjects: Quark, Particle physics, Photon, Proton, media_common.quotation_subject, HERA, General Physics and Astronomy, Parton, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], PARTON DISTRIBUTIONS, NUCLEON, HERA, NUCLEON, 010306 general physics, Nuclear Experiment, media_common, Physics, 010308 nuclear & particles physics, Compton scattering, 12.40.Vv,13.40.Gp,13.60.Fz,13.60.Hb,13.60.-r,14.20.Dh,24.85.+p, PARTON DISTRIBUTIONS, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, Nucleon
Abstract: 1 tex file (6 pages), 4 (eps) figures; The beam spin asymmetries in the hard exclusive electroproduction of photons on the proton (ep -> epg) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (x_B from 0.11 to 0.58, Q^2 from 1 to 4.8 GeV^2, -t from 0.09 to 1.8 GeV^2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A = a*sin(phi)/[1+c*cos(phi)]. This extensive set of data can thus be used to constrain significantly the generalized parton distributions of the nucleon in the valence quark sector.
Published: 2008

16. Elastic and inelastic scattering of 280 and 489 MeV protons from 58Ni

Author: D. K. McDaniels, Z. Xu, L.W. Swenson, F. Farzanpay, Z. Tang, J. Lisantti, K.H. Hicks, X.Y. Chen, D.M. Drake, and Michel Vetterli
Subjects: Physics, Elastic scattering, Nuclear and High Energy Physics, Proton, Scattering, Isoscalar, Nuclear Theory, Hadron, Inelastic scattering, Nuclear physics, Physics::Accelerator Physics, Neutron, Atomic physics, Nuclear Experiment, Multipole expansion
Abstract: Nonrelativistic and relativistic collective deformed potential models have been used to study the excitation of seven states in 58Ni by 280 and 489 MeV unpolarized protons. Optical model potentials were determined at each energy by fitting elastic scattering data using both of the models. Deformation lengths were also obtained using both models with no dependence on incident energy observed for either model. The average value of the hadronic deformation lengths along with the charge deformation lengths were used to calculate neutron to proton multipole matrix elements ( M n M p ). Five transitions, 2+1, 1.45 MeV; 2+3, 3.04 MeV; 2+4, 3.26 MeV; 4+1, 2.46 MeV; and the 4+5, 4.75 MeV state were determined to be isoscalar, i.e. M n M p = N Z . The 4+2, 3.63 MeV state was observed to be a proton-like transition with M n M p = 0.43 ± 0.18. At small scattering angles, the relativistic model gave consistently larger cross sections than the nonrelativistic model. This effect was much larger at 280 MeV than at 489 MeV.
Published: 1990

17. A complete measurement of spin-observables for intermediate-energy inclusive quasielastic polarized proton scattering from 12C

Author: O. Häusser, C. Chan, T.E. Drake, R. Schubank, D. Frekers, L. Lee, R. Abegg, K.H. Hicks, C. A. Miller, S. Yen, and D. A. Hutcheon
Subjects: Physics, Nuclear and High Energy Physics, Quasielastic scattering, Scattering, media_common.quotation_subject, Momentum transfer, Observable, Polarization (waves), Asymmetry, Nuclear physics, Quasielastic neutron scattering, Atomic physics, Fermi gas, media_common
Abstract: The complete set of Wolfenstein parameters, the polarization, the asymmetry of scattering and the unpolarized double-differential cross section are presented for inclusive quasielastic proton scattering from 12C at a central momentum transfer of q = 1.9 fm−1 and incident energies of 290 and 420 MeV. The spin observables D0, Dx, Dy and Dz as well as the longitudinal-to-transverse ratio of spin-flip probabilities are extracted from the data. Across the quasielastic continuum, the experimental data is compared to the variations expected from a single-scattering Fermi-gas approximation using the free NN amplitudes. Medium effects are evident in the pronounced quenching of the polarization parameter relative to the free value.
Published: 1990

18. Measurement of Two- and Three-Nucleon Short-Range Correlation Probabilities in Nuclei

Author: D. Doughty, J. Langheinrich, E. Pasyuk, P. Nadel-Turonski, L. M. Qin, Tsutomu Mibe, K. Mikhailov, Y. Prok, H. Denizli, M. Klusman, N. A. Baltzell, V. Batourine, B. Carnahan, K. A. Griffioen, K. S. Egiyan, P. Coltharp, G. Ricco, Victor Mokeev, R. A. Schumacher, C. Bultuceanu, Cynthia Marie Hadjidakis, Michael Dugger, K. Park, Daniel S. Carman, H. O. Funsten, Friedrich Klein, S. Tkachenko, L. Guo, M. Ungaro, M. Osipenko, F. Sabatié, S. Bültmann, T. A. Forest, Bernhard Mecking, V. P. Kubarovsky, K. V. Dharmawardane, C. E. Hyde-Wright, J. Donnelly, G. Asryan, O. P. Dzyubak, M. M. Ito, P. Eugenio, M. Taiuti, S. Stepanyan, J. D. Kellie, B. E. Stokes, C. Peterson, G. S. Adams, Alexei V. Klimenko, R. Miskimen, Sergey Kuleshov, M. Bektasoglu, J. Pierce, R. J. Feuerbach, A. Empl, O. Pogorelko, Avraham Klein, L. C. Dennis, P. Corvisiero, K. Joo, L. C. Smith, Elton Smith, B. E. Bonner, R. A. Niyazov, J. Yun, M. Battaglieri, D. J. Tedeschi, H. Avakian, M. Guidal, Barry Ritchie, J. R. Calarco, B. S. Ishkhanov, N. Guler, E. De Sanctis, Federico Ronchetti, David Jenkins, A. Yegneswaran, R. Bradford, G. Gavalian, R. DeVita, J. W C McNabb, Hall Crannell, F. W. Hersman, P. Stoler, M. Anghinolfi, M. Holtrop, W. Kim, James Mueller, N. Benmouna, M. Ripani, Latifa Elouadrhiri, S. Strauch, P. L. Cole, J. Lachniet, E. Golovatch, D. I. Sober, R. C. Minehart, C. A. Meyer, Michael Vineyard, P. D. Rubin, G. E. Dodge, A. Tkabladze, Y. G. Sharabian, G. V. Fedotov, G. Rosner, B. B. Niczyporuk, Misak Sargsian, M. Bellis, P. Dragovitsch, D. Rowntree, Mark Strikman, P. V. Degtyarenko, R. Fatemi, J. Zhang, R. Suleiman, S. Taylor, G. Niculescu, S. A. Dytman, N. Pivnyuk, V. Sapunenko, Dinko Pocanic, A. V. Vlassov, J. Hu, D. P. Weygand, J. Kuhn, T. Lee, G. S. Mutchler, I. Niculescu, S. Niccolai, L. C. Maximon, M. Khandaker, Roy Thompson, S. E. Kuhn, D. Lawrence, S. A. Morrow, C. Djalali, M. Guillo, C. Tur, J. Hardie, J. Shaw, Shifeng Chen, R. W. Gothe, P. Ambrozewicz, M. D. Mestayer, H. Egiyan, W. K. Brooks, K. Y. Kim, A.V. Stavinsky, J. T. Goetz, E. Polli, V. Gyurjyan, Marco A. Huertas, Michael Wood, V. S. Serov, Michael L. Williams, Sylvain Bouchigny, I. Bedlinskiy, S. Boiarinov, B. M. Preedom, Lorenzo Zana, J. P. Santoro, H. S. Jo, C. Salgado, A. I. Ostrovidov, D. G. Ireland, Gerard Gilfoyle, Volker D. Burkert, A. S. Biselli, B. McKinnon, H. G. Juengst, K.H. Hicks, D. Branford, M. Mirazita, J. M. Laget, N. Gevorgyan, Laird Kramer, N. Baillie, E. Wolin, J. P. Ball, D. G. Crabb, Kwangsoo Kim, Jim Napolitano, G. Riccardi, B. A. Raue, N. Dashyan, I. Hleiqawi, S. L. Careccia, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, S. McAleer, F. X. Girod, Y. Ilieva, Hovhannes Baghdasaryan, J. W. Price, J. P. Cummings, Rakhsha Nasseripour, L. Todor, D. Protopopescu, S. Pozdniakov, G. V. O'Rielly, K. Livingston, and P. Rossi
Subjects: Physics, Nuclear physics, Helium-4, Scattering, Helium-3, Carbon-12, General Physics and Astronomy, Nuclear force, Electron, Atomic physics, Nucleon, Electron scattering
Abstract: The ratios of inclusive electron scattering cross sections of {sup 4}He, {sup 12}C, and {sup 56}Fe to {sup 3}He have been measured at 1 1.4 GeV{sup 2}, the ratios exhibit two separate plateaus, at 1.5 2.25. This pattern is predicted by models that include 2- and 3-nucleon short-range correlations (SRC). Relative to A=3, the per-nucleon probabilities of 3-nucleon SRC are 2.3, 3.1, and 4.4 times larger for A=4, 12, and 56. This is the first measurement of 3-nucleon SRC probabilities in nuclei.
Published: 2006

19. MEASUREMENT OF DEEPLY VIRTUAL COMPTON SCATTERING WITH A POLARIZED PROTON TARGET

Author: B. E. Bonner, H. Avakian, Marco A. Huertas, D. Doughty, Sylvain Bouchigny, Daniel S. Carman, P. Rossi, S. Barrow, W. J. Briscoe, V. Batourine, C. E. Hyde-Wright, S. A. Dytman, P. Nadel-Turonski, Tsutomu Mibe, Y. Ilieva, B. Carnahan, Sergey Kuleshov, Ji Li, M. Bektasoglu, E. Wolin, M. Ripani, M. Nozar, R. J. Feuerbach, P. Coltharp, A. V. Vlassov, M. D. Mestayer, J. Langheinrich, S. S. Stepanyan, E. Pasyuk, S. A. Philips, M. Khandaker, E. L. Isupov, V. Sapunenko, J. Kuhn, B. McKinnon, J. P. Ball, Y. Prok, M. M. Ito, Michael L. Williams, J. Shaw, Michael Wood, S. Strauch, A. I. Ostrovidov, A. C S Lima, L. Todor, S. Boiarinov, K. Hafidi, D. Protopopescu, Friedrich Klein, D. J. Tedeschi, S. Pozdniakov, M. Garçon, B. L. Berman, H. Y. Lu, D. Branford, M. Guidal, R. W. Gothe, D. G. Ireland, D. G. Crabb, L. M. Qin, Hall Crannell, V. S. Serov, M. Mirazita, J. M. Laget, A. Yegneswaran, Volker D. Burkert, A. S. Biselli, K. Y. Kim, G. Rosner, K. Park, M. Bellis, R. Nasseripour, M. Holtrop, C. Paterson, R. Suleiman, G. S. Mutchler, K.H. Hicks, D. P. Watts, H. Egiyan, N. A. Baltzell, M. Klusman, Michael Vineyard, M. Osipenko, F. Sabatié, Laird Kramer, K. A. Griffioen, B. E. Stokes, P. Stoler, B. M. Preedom, N. Markov, V. Crede, G. S. Adams, K. Beard, L. C. Smith, M. Amarian, Lorenzo Zana, J. P. Santoro, B. S. Ishkhanov, P. Eugenio, Federico Ronchetti, V. P. Kubarovsky, J. R. Calarco, Kalvir S. Dhuga, Nikolay Shvedunov, H. Hakobyan, R. A. Schumacher, M. Taiuti, H. S. Jo, W. Kim, G. Niculescu, Gerard Gilfoyle, M. R. Niroula, M. MacCormick, I. Hleiqawi, S. L. Careccia, J. D. Kellie, U. Thoma, Gerald Feldman, C. Salgado, N. Guler, S. Niccolai, M. Battaglieri, P. Collins, N. Natasha, E. De Sanctis, K. L. Giovanetti, S. Bültmann, L. Morand, Larry Weinstein, T. A. Forest, D. I. Sober, R. Fatemi, S. Stepanyan, N. Baillie, J. Hardie, K. S. Egiyan, R. Bradford, K. Lukashin, J. Pierce, Avraham Klein, B. Zhao, G. E. Dodge, E. Golovatch, K. Mikhailov, P. V. Degtyarenko, P. Bosted, I. Niculescu, D. Lawrence, A. Cazes, Maryam Moteabbed, Bernhard Mecking, R. De Masi, F. W. Hersman, C. D. Keith, K. V. Dharmawardane, S. Tkachenko, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, Kwangsoo Kim, G. Riccardi, B. A. Raue, Cynthia Marie Hadjidakis, Chaden Djalali, C. Butuceanu, Michael Dugger, H. O. Funsten, P. Corvisiero, H. G. Juengst, G. Gavalian, H. Denizli, N. Benmouna, A.V. Stavinsky, I. Bedlinskiy, A. V. Skabelin, Marc Vanderhaeghen, Barry Ritchie, Victor Mokeev, L. Guo, M. Ungaro, Latifa Elouadrhiri, K. Joo, R. C. Minehart, C. A. Meyer, J. Yun, D. Cords, G. V. Fedotov, D. P. Weygand, J. Zhang, M. Guillo, H. Bagdasaryan, I. I. Strakovsky, A. Deur, W. K. Brooks, J. Lachniet, A. Tkabladze, D. Rowntree, G. V. O'Rielly, R. S. Hakobyan, L. El Fassi, Z. W. Zhao, D. G. Jenkins, B. B. Niczyporuk, P. L. Cole, S. McAleer, F. X. Girod, N. Pivnyuk, D. Heddle, J. Napolitano, Giovanni Ricco, Atilla Gonenc, J. W. Price, O. Pogorelko, R. Miskimen, R. DeVita, J. W C McNabb, S. A. Morrow, P. Ambrozewicz, Shifeng Chen, J. P. Cummings, M. Kossov, I. Popa, J. T. Goetz, E. Polli, V. Gyurjyan, Dinko Pocanic, S. E. Kuhn, C. Tur, Elton Smith, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, K. Livingston, L. C. Dennis, 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), CEA- Saclay (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Photon, Proton, Nuclear Theory, media_common.quotation_subject, General Physics and Astronomy, FOS: Physical sciences, Parton, Electron, 01 natural sciences, Asymmetry, High Energy Physics - Experiment, Nuclear physics, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), GENERALIZED PARTON DISTRIBUTIONS, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, NUCLEON, Spin-½, media_common, Physics, 010308 nuclear & particles physics, Compton scattering, High Energy Physics - Phenomenology, High Energy Physics::Experiment, GENERALIZED PARTON DISTRIBUTIONS, NUCLEON, CLAS, 13.60.Fz, 13.60.Hb, 14.20.Dh, Nucleon
Abstract: The longitudinal target-spin asymmetry A_UL for the exclusive electroproduction of high energy photons was measured for the first time in p(e,e'p\gamma). The data have been accumulated at Jefferson Lab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized NH_3 target. A significant azimuthal angular dependence was observed, resulting from the interference of the Deeply Virtual Compton Scattering and Bethe-Heitler processes. The amplitude of the sin(phi) moment is 0.252 +/- 0.042(stat) +/- 0.020(sys). Theoretical calculations are in good agreement with the magnitude and the kinematic dependence of the target-spin asymmetry, which is sensitive to the generalized parton distributions H and H-tilde., Comment: Modified text slightly, added references
Published: 2006

20. Evidence for an exotic S=+1 baryon resonance at a mass of 1540 MeV

Author: K.H. Hicks
Subjects: Physics, Particle physics, Nuclear Theory, Strangeness, Quantum number, Resonance (particle physics), Xi baryon, Baryon, Nuclear physics, Bound state, Mass spectrum, High Energy Physics::Experiment, Neutron, Nuclear Experiment
Abstract: A new baryon resonance with manifestly exotic strangeness quantum number S = +1 was first observed from the LEPS detector at the SPring‐8 facility in Japan. The photoproduction reaction γn → K−Θ+ was measured, where the neutron is bound in a 12C nucleus and the Θ+ is the new name of this resonance. The existence of the Θ+ was inferred by observing a peak in the missing mass spectrum of the K−, with the requirement of a coincident K+ in the detector from the decay of the Θ+. The mass of the resonance is 1.54 ± 0.01 GeV and a width of < 25 MeV.
Published: 2004

21. Hyperon Photoproduction in the Nucleon Resonance Region

Author: G. E. Dodge, Jing Zhao, W. Kim, M. Bellis, K. Park, S. McAleer, P. V. Degtyarenko, K. Kim, R. Miskimen, J. Yun, R. Fatemi, R. J. Feuerbach, Bernhard Mecking, K. V. Dharmawardane, Hovanes Egiyan, A. V. Vlassov, J. Lachniet, I. Niculescu, D. Rowntree, G. Riccardi, D. Lawrence, R. DeVita, J. W C McNabb, J. W. Price, A. Empl, O. Pogorelko, K. Lukashin, A. Coleman, H. R. Weller, G. Ricco, R. S. Hakobyan, F. W. Hersman, M. Bektasoglu, A. V. Skabelin, G. S. Mutchler, J. J. Manak, Hall Crannell, K. A. Griffioen, G. Gavalian, V. Sapunenko, Valeria Muccifora, S. A. Philips, P. Heimberg, Philip L. Cole, B. E. Bonner, B. M. Preedom, S. A. Morrow, Shalev Gilad, P. Stoler, H. Avakian, K. S. Egiyan, L. C. Smith, G. V. O'Rielly, Gerard Gilfoyle, S. J. Gaff, Baile Zhang, J. J. Melone, K. Mikhailov, David Jenkins, P. Eugenio, Friedrich Klein, R. A. Schumacher, R. S. Hicks, M. Battaglieri, I. I. Strakovsky, C. Marchand, M. Taiuti, K. Sabourov, W. J. Briscoe, B. P. Quinn, S. A. Dytman, C. I O Gordon, D. I. Sober, W. K. Brooks, S. Taylor, M. Osipenko, J. P. Cummings, E. De Sanctis, C. S. Whisnant, J. P. Santoro, L. Morand, K. Y. Kim, T. A. Forest, D. Branford, R. A. Niyazov, M. Ripani, K. Beard, John T. O'Brien, R. Bradford, S. Stepanyan, M. Mirazita, J. M. Laget, L.C. Dennis, Cynthia Marie Hadjidakis, H. Bagdasaryan, P. Corvisiero, Chaden Djalali, M. Kossov, M. M. Ito, H. Denizli, Kalvir S. Dhuga, A. Weisberg, Sylvain Bouchigny, K. Wang, Avraham Klein, Volker D. Burkert, Federico Ronchetti, C. Butuceanu, Michael Dugger, Y. Kuang, A. S. Biselli, H. O. Funsten, K.H. Hicks, G. S. Adams, M. Guillo, C. Salgado, Patrick Girard, J. Shaw, Rakhsha Nasseripour, K. Joo, S. Strauch, B. B. Niczyporuk, E. Polli, V. Gyurjyan, A. D. Cords, S. O. Nelson, Dinko Pocanic, Michael Wood, U. Thoma, N. Pivnyuk, J. R. Calarco, V. S. Serov, S. E. Kuhn, J. Napolitano, S. Mehrabyan, Ji Li, J. H. Kelley, C. Tur, M. D. Mestayer, Laird Kramer, Alexei V. Klimenko, Elton Smith, B. A. Raue, J. R. Ficenec, Roy Thompson, Barry Ritchie, M. Anghinolfi, E. Wolin, S. Boiarinov, James Mueller, P. D. Rubin, Y. G. Sharabian, J. P. Ball, Y. Prok, M. Eckhause, Latifa Elouadrhiri, R. C. Minehart, C. A. Meyer, C. Cetina, Michael Vineyard, D. G. Crabb, D. P. Weygand, A. Yegneswaran, P. Dragovitsch, S. Niccolai, J. Hardie, A.V. Stavinsky, J. S. McCarthy, J. Hu, B. Carnahan, F. Sabatié, Thierry Auger, B. L. Berman, L. M. Qin, M. Klusman, D. Doughty, D. Heddle, L. Ciciani, Y. Ilieva, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, M. Spraker, Larry Weinstein, Nicola Bianchi, E. Anciant, L. Todor, D. Protopopescu, S. Pozdniakov, Z. L. Zhou, A. Shafi, M. Khandaker, G. A. Peterson, S. Barrow, P. Rossi, E. Pasyuk, D. J. Tedeschi, M. Guidal, G. Niculescu, M. Holtrop, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Nozar, L. Guo, and M. Ungaro
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Hyperon, FOS: Physical sciences, Lambda, Lambda baryon, High Energy Physics - Experiment, Sigma baryon, Baryon, Nuclear physics, High Energy Physics - Experiment (hep-ex), Recoil, PHOTON ENERGIES, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nucleon
Abstract: Cross-sections and recoil polarizations for the reactions gamma + p --> K^+ + Lambda and gamma + p --> K^+ + Sigma^0 have been measured with high statistics and with good angular coverage for center-of-mass energies between 1.6 and 2.3 GeV. In the K^+Lambda channel we confirm a structure near W=1.9 GeV at backward kaon angles, but our data shows a more complex s- and u- channel resonance structure than previously seen. This structure is present at forward and backward angles but not central angles, and its position and width change with angle, indicating that more than one resonance is playing a role. Rising back-angle cross sections at higher energies and large positive polarization at backward angles are consistent with sizable s- or u-channel contributions. None of the model calculations we present can consistently explain these aspects of the data., 5 pages, 3 figures, submitted to Physical Review Letters
Published: 2003
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22. The CEBAF large acceptance spectrometer (CLAS)

Author: B. L. Berman, L. M. Qin, D. Doughty, D. Heddle, M. Klusman, R. C. Minehart, R. J. Feuerbach, P.F. Yergin, D. Tilles, R. A. Schumacher, S. Stepanyan, Avraham Klein, W.S. Duncan, R. Magahiz, J. W. Price, D. J. Tedeschi, C. Riggs, M. Guidal, G. Asryan, Federico Ronchetti, H. Avakian, F. Barbosa, A. Yegneswaran, G. E. Dodge, A. Lake, Thierry Auger, A. K. Opper, P. V. Degtyarenko, I. Niculescu, John T. O'Brien, D. Lawrence, G. Ricco, M. Holtrop, Thomas E. Smith, D. Joyce, W.M. Taylor, Hall Crannell, M. Kossov, E. Golovatch, S. A. Dytman, P. Corvisiero, K. Beard, Philip L. Cole, W. Kim, V. Muccifora, L. Elouadrhiri, N. Bianchi, Barry Ritchie, Robert E. Welsh, J.E. O'Meara, W. Tuzel, Friedrich Klein, R. S. Hicks, A. Coleman, A. Longhi, E. Polli, V. Gyurjyan, M. Witkowski, Bernhard Mecking, Elton Smith, D. I. Sober, W. K. Brooks, J. Gram, E. DeSanctis, V. S. Serov, J. Lachniet, M. Taiuti, M. Anghinolfi, R. Miskimen, V. Frolov, J. Ficenec, James Mueller, M. Battaglieri, D. Kashy, F. Roudot, Y. G. Sharabian, R. DeVita, J. W C McNabb, K. L. Giovanetti, B. Asavapibhop, J. Distelbrink, Larry Weinstein, E. Anciant, L.C. Dennis, S. Taylor, M. M. Ito, J. Connelly, P. Bonneau, C. Martin, G.R. Wilkin, G. S. Adams, Daniel S. Carman, L. C. Smith, J. Yun, D. Cords, G. Audit, David Jenkins, C. E. Hyde-Wright, P. Hemler, S. E. Kuhn, K. Joo, Jim Napolitano, Roy Thompson, G. Riccardi, M. Ripani, A. V. Vlassov, C. Marchand, B. A. Raue, M. Nozar, B. B. Niczyporuk, H. Egiyan, E. Pasyuk, W. J. Briscoe, D. Insley, U. Thoma, Michael Dugger, D. P. Weygand, H. O. Funsten, K. Lukashin, W. R. Dodge, E. Wolin, J. J. Manak, T. Carstens, S. Ahmad, A.V. Stavinsky, G. Jacobs, C. Salgado, J. P. Ball, W. Major, D. G. Crabb, G. Doolittle, L. Y. Murphy, K. S. Egiyan, V. Koubarovski, T.Y. Tung, M. Khandaker, M. Mirazita, S. Barrow, P. Rossi, L. Todor, S. Pozdniakov, M. D. Mestayer, F. W. Hersman, S. Boiarinov, V. Sapunenko, Gerard Gilfoyle, R.C. Cuevas, S. K. Matthews, C. Cetina, Michael Vineyard, S.B. Christo, J. Robb, K.H. Hicks, Laird Kramer, Volker D. Burkert, G. S. Mutchler, M. McMullen, S. A. Philips, and P. Stoler
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Spectrometer, Meson, Particle accelerator, Particle identification, law.invention, Nuclear physics, law, Carbon–fluorine bond, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Instrumentation, Cherenkov radiation
Abstract: The CEBAF large acceptance spectrometer (CLAS) is used to study photo- and electro-induced nuclear and hadronic reactions by providing efficient detection of neutral and charged particles over a good fraction of the full solid angle. A collaboration of about 30 institutions has designed, assembled, and commissioned CLAS in Hall B at the Thomas Jefferson National Accelerator Facility. The CLAS detector is based on a novel six-coil toroidal magnet which provides a largely azimuthal field distribution. Trajectory reconstruction using drift chambers results in a momentum resolution of 0.5% at forward angles. Cherenkov counters, time-of-flight scintillators, and electromagnetic calorimeters provide good particle identification. Fast triggering and high data-acquisition rates allow operation at a luminosity of 10 34 nucleon cm −2 s −1 . These capabilities are being used in a broad experimental program to study the structure and interactions of mesons, nucleons, and nuclei using polarized and unpolarized electron and photon beams and targets. This paper is a comprehensive and general description of the design, construction and performance of CLAS.
Published: 2003

23. Letter of intent to build an off-axis detector to study nu(mu) ---> nu(e) oscillations with the NuMI neutrino beam

Author: P. Lucas, Panagiotis Spentzouris, Patrick Huber, J. Schneps, A. De Santo, D. G. Michael, David Petyt, P. Slattery, S. Avvakumov, H. Minakata, H. J. Kang, R. Hatcher, Hiroshi Nunokawa, C. W. Walter, D. S. Ayres, K. S. McFarland, Adam Para, T. Joffe-Minor, T. Kafka, V. J. Guarino, R. Shrock, P. deBarbaro, S. Manly, B. Kayser, Gary Drake, W. Metcalf, R. A. Richards, N.V. Mokhov, V. Makeev, R. L. Talaga, Sacha E Kopp, S. Menary, N. Morgan, P. Shanahan, R. Ray, H. R. Gallagher, N. Tagg, P. Kasper, C. Cueva, G.D. Barr, I. Trostin, D. A. Harris, S.M. Grimes, A. Marchionni, J. Cooper, A. C. Weber, Walter Winter, D. Naples, B. C. Choudhary, W. Sakumoto, Stephen J. Parke, Kirk T. McDonald, H. S. Budd, Stanley G. Wojcicki, P. J. Litchfield, G. Tzanakos, Juergen Thomas, Manfred Lindner, K-B. Luk, D. E. Reyna, K. Ruddick, A. Mann, S. M. Seun, Raymond Lee, V. Scarpino, J. Hylen, E. Blucher, S. Childress, E. Kearns, Marvin L Marshak, K.H. Hicks, David B. Cline, D. Carey, A.K. Opper, Carl H. Albright, F. DeJongh, R. Svoboda, M. C. Goodman, Ken Heller, J. K. Nelson, D.S. Carman, V. Ryabov, Karol Lang, E. A. Peterson, G. F. Pearce, J.H. Cobb, M. Zielinski, K. Lee, S. Geer, J. L. Thron, G. M. Irwin, Philip Harris, C. Bromberg, Kate Scholberg, G. J. Feldman, T. Patzak, C.R. Brune, N. Giokaris, S. Pordes, P. M. Border, A. Bodek, K. M. Heeger, S. M. S. Kasahara, Alexandre Lebedev, Caren Hagner, D. M. DeMuth, Kai Zuber, Thomas R. Chase, N. Pearson, R. Imlay, J. Urheim, Alec Habig, V. Paolone, L. Mualem, and G. Ginther
Subjects: Nuclear physics, Physics, Particle physics, Physics::Instrumentation and Detectors, MINOS, Measurements of neutrino speed, High Energy Physics::Experiment, Solar neutrino problem, Neutrino, Neutrino oscillation, NuMI, Particle detector, Lepton
Abstract: The NuMI neutrino beam line and the MINOS experiment represent a major investment of US High Energy Physics in the area of neutrino physics. The forthcoming results could decisively establish neutrino oscillations as the underlying physics mechanism for the atmospheric $\numu$ deficit and provide a precise measurement of the corresponding oscillation parameters, $\dmsq23$ and $\sinsq2t23$.neutrino sector may well be within our reach. The full potential of the NuMI neutrino beam can be exploited by complementing the MINOS detector, under construction, with a new detector(s) placed at some off-axis position and collecting data in parallel with MINOS. The first phase of the proposed program includes a new detector, optimized for $\nue$ detection, with a fiducial mass of the order of 20 kton and exposed to neutrino and antineutrino beams. In a five year run its sensitivity to the $\numutonue$ oscillations will be at least a factor of ten beyond the current limit. The future direction of the program will depend on the results of this first phase, but it is very likely that it will be a combination of a significant increase of the neutrino beam intensity via an upgraded proton source and an increase of the detector mass by a factor of five or so. Depending on the circumstances, the goals of Phase II may be a further increase of the sensitivity of a search for $\numutonue$ oscillations, or, perhaps, a measurement of the CP violating phase $\delta$ in the lepton sector.
Published: 2002

24. NEUTRAL PION PRODUCTION FROM DEUTERIUM AT THE LEGS FACILITY

Author: C. S. Whisnant, M. Blecher, H. Ströher, B. M. Preedom, M. Lowry, J. Tonnison, A. Lehmann, A. Caracappa, A. M. Sandorfi, R. A. Lindgren, A. K. Opper, A. Cichocki, A. D'Angelo, R. Deininger, S. Hoblit, K. Wang, M. Lucas, O. C. Kistner, J. P. Didilez, C. Schaerf, D. Willits, X. Wei, L. Miceli, M. Khandaker, B. E. Norum, K. Ardashev, C. E. Thorn, F. Lincoln, K.H. Hicks, Anthony Kuczewski, H. Meyer, and C. Commeaux
Subjects: Physics, Particle physics, Nuclear Theory, PHOTONS, Coincidence, Settore FIS/04 - Fisica Nucleare e Subnucleare, DELTA REGION, PHOTOPRODUCTION, SPECTROMETER, Nuclear physics, Pion, Amplitude, Deuterium, High Energy Physics::Experiment, Neutron, Nuclear Experiment, National laboratory, Nucleon, Spin-½
Abstract: Neutral pion photoproduction from a liquid deuterium target was measured in the energy region near 300 MeV at the LEGS facility of Brookhaven National Laboratory. The inclusive cross sections from deuterium are in agreement with measurments from Mainz, yet the exclusive cross sections and spin asymmetries for neutral pion production in coincidence with a detected nucleon are much smaller than expected from a quasi-free approximation. This may indicate that substantial final state interactions play a significant role, which will complicate the extraction of the desired amplitudes that would be measured if a free neutron target could be used.
Published: 2002

25. Strangeness Production at CLAS

Author: K.H. Hicks
Subjects: Physics, Particle physics, Meson, Hadron, Hyperon, Strangeness production, Particle accelerator, Strangeness, Lambda baryon, law.invention, Baryon, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The CLAS detector is a large acceptance spectrometer located at the electron accelerator at Thomas Jefferson National Accelerator Facility. Production of K+ and K* mesons along with associated hyperons were measured using the CLAS detector at electron beam energies of 2.4–4.4 GeV. In addition, polarization transfer from the electron helicity to the Λ hyperon was measured. These data are compared with theoretical models, where available, based on fits to older, less precise K+ data. The new data for CLAS indicate that improvements in the models are necessary in order to interpret the results.
Published: 2002

26. THE POLARIZED <font>HD</font> ICE TARGET AT LEGS

Author: A. M. Sandorfi, R. A. Lindgren, K.H. Hicks, A. Honig, D. Moricciani, X. Wei, R. Deininger, O. C. Kistner, B. E. Norum, M. Khandaker, B. M. Preedom, Anthony Kuczewski, F. Lincoln, H. Meyer, L. Miceli, O. Bartalini, M. Lucas, C. Schaerf, J. P. Didelez, T. Saitoh, M. Blecher, M. Lowry, K. Ardashev, C. E. Thorn, C. Steven Whisnant, H. Ströher, S. Hoblit, A. Lehmann, K. Wang, A. Caracappa, and A. D'Angelo
Subjects: Physics, Nuclear physics
Published: 2001

27. Observation of Exclusive Deeply Virtual Compton Scattering in Polarized Electron Beam Asymmetry Measurements

Author: K.H. Hicks, M. M. Ito, K. Mikhailov, Laird Kramer, D. J. Tedeschi, M. Guidal, C. Marchand, G. Niculescu, Daijin Kim, V. Sapunenko, M. Holtrop, D. Dore, Patrick Girard, A. Shafi, M. Klusman, L. Yanik, Sylvain Bouchigny, Daniel S. Carman, J. P. Cummings, L. Murphy, R. De Vita, V. S. Serov, A. Yegneswaran, A. Coleman, Gerard Gilfoyle, G. Audit, G. Gavalian, W. Kim, V. Muccifora, K. Park, M. Ripani, S. Whisnant, B. M. Preedom, Robert E. Welsh, I. Popa, K. A. Griffioen, R. A. Schumacher, E. Anciant, P.Y. Bertin, M. Bektasoglu, R. C. Minehart, E. De Sanctis, Elton Smith, G. Feldman, Volker D. Burkert, C. A. Meyer, A. S. Biselli, P. Dragovitsch, G. V. O'Rielly, L. Elouadrhiri, J. R. Calarco, J. Yun, D. Cords, H. Egiyan, E. Polli, Cynthia Marie Hadjidakis, A. K. Opper, S. A. Philips, A. Empl, O. Pogorelko, S. O. Nelson, S. Niccolai, D. Rowntree, M. Battaglieri, D. I. Sober, W. K. Brooks, K. Sabourov, A. Longhi, Jing Zhao, L. C. Dennis, B. E. Bonner, J. Hardie, E. Pasyuk, Igor Strakovsky, H. Avakian, L. M. Qin, M. Anghinolfi, James Mueller, L. C. Maximon, M. Khandaker, P. Heimberg, N. Pivnyuk, Pavel Degtiarenko, S. McAleer, R. Fatemi, B.L. Berman, Roy Thompson, A.V. Stavinsky, T. A. Forest, G. A. Peterson, P. D. Rubin, A. V. Vlassov, J. Ficenec, F. Ronchetti, L. Ciciani, R. J. Feuerbach, Mestayer, S. A. Dytman, E. Wolin, S. Simionatto, Avraham Klein, Shalev Gilad, K. Wang, C. Salgado, Dinko Pocanic, K. Beard, Bernhard Mecking, K. V. Dharmawardane, H. Funsten, K. L. Giovanetti, B. Asavapibhop, J. W. Price, R. Miskimen, J. P. Ball, K. S. Dhuga, P. Stoler, M. Eckhause, Larry Weinstein, D. Doughty, S. E. Kuhn, Charles Hyde, S. Barrow, P. Rossi, K. Lukashin, Hall Crannell, G. Riccardi, D. Heddle, J. S. McCarthy, J. H. Kelley, J. J. Manak, M. Guillo, J. W C McNabb, Yu.G. Sharabian, David A. Jenkins, D. G. Crabb, K. Y. Kim, S. Stepanyan, M. Taiuti, John T. O'Brien, M. Kossov, D. Protopopescu, C. Djalali, Baile Zhang, J. Hu, Barry Ritchie, Kevin Fissum, S. Pozdniakov, M. Garçon, D. Branford, C. Cetina, G. E. Dodge, A.R. Reolon, Z. L. Zhou, M. Mirazita, J. M. Laget, K. Kim, H. R. Weller, J. Shaw, P. Corvisiero, I. Niculescu, D. Lawrence, Jim Napolitano, B. A. Raue, L. Morand, F. W. Hersman, H. Denizli, K. S. Egiyan, Michael Vineyard, V. Gyurjyan, Nicola Bianchi, R. Suleiman, A. V. Skabelin, G. S. Mutchler, S. Boiarinov, R. A. Niyazov, S. Taylor, G. S. Adams, B. Carnahan, F. Sabatié, K. Joo, Thierry Auger, W.J. Briscoe, L. Todor, L. C. Smith, S. J. Gaff, D. P. Weygand, G. Ricco, Philip L. Cole, Moshe Gai, Friedrich Klein, R. S. Hicks, and A. P. Freyberger
Subjects: Quantum chromodynamics, Physics, Elastic scattering, Scattering, media_common.quotation_subject, Compton scattering, General Physics and Astronomy, Asymmetry, Nuclear physics, Amplitude, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure), Spin-½, media_common
Abstract: We report the first results of the beam spin asymmetry measured in the reaction e + p -> e + p + gamma at a beam energy of 4.25 GeV. A large asymmetry with a sin(phi) modulation is observed, as predicted for the interference term of Deeply Virtual Compton Scattering and the Bethe-Heitler process. The amplitude of this modulation is alpha = 0.202 +/- 0.028. In leading-order and leading-twist pQCD, the alpha is directly proportional to the imaginary part of the DVCS amplitude.
Published: 2001

28. Measurements of large-angle neutron spectra at E665

Author: K.H. Hicks
Subjects: Physics, Quark, Particle physics, Muon, Nuclear Theory, Jet (particle physics), Nuclear matter, Hadronization, Nuclear physics, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, Nucleon, Lepton
Abstract: The response of the nucleus to high energy probes promises to yield new information about the properties of nuclear matter. Specifically, one may learn about how a nucleon imbedded in the nucleus differs from a nucleon in free space. The nuclear response at high energies has drawn much attention in recent years, partly due to the EMC measurements. The high‐energy muon beam at Fermilab has been used by the E665 collaboration to extend studies of the nuclear response to higher energies using a 500 GeV muon beam. The present measurement emphasizes one aspect of the nuclear response to high‐energy leptons by detecting few‐MeV nucleons emitted from the nucleus. From this information, the average excitation of the residual nucleus can be inferred using standard low‐energy techniques. These data may help in developing an understanding of the hadronization process of the struck quark. The long‐standing question of the process by which the struck quark emerges dressed as a hadron jet is still open, partly because ...
Published: 1992

29. Ratio of the isovector effective interaction strengths ‖Jστ/Jτ‖2 between 200 and 450 MeV from the 14C(p, n) 14N reaction

Author: R.L. Helmer, S. Yen, W.P. Alford, O. Häusser, R.E. Azuma, A. Celler, Helmut W. Baer, K.H. Hicks, C. A. Miller, C.D. Zafiratos, D. Frekers, R.S. Henderson, R. Abegg, and K. P. Jackson
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Isovector, Nuclear Theory, Physics::Accelerator Physics, Impulse (physics), Atomic physics, Nuclear Experiment, Nucleon, Fermi Gamma-ray Space Telescope
Abstract: The cross section at 0° for the reaction 14 C(p, n) 14 N has been measured at energies of 200, 300, 400 and 450 MeV using a nucleon charge-exchange facility recently commissioned at TRIUMF. Energy resolution of 1 MeV or better was obtained at each energy, permitting a reliable measurement of the cross section ratio for the Gamow-Teller transition to the 1 + state at 3.95 MeV and the Fermi transition to the 0 + state at 2.31 MeV. The deried values of ‖ J στ / J τ ‖ 2 are in clear disagreement with impulse approximation calculations using a free NN t -matrix.
Published: 1986

30. Relativistic medium effects for 208Pb at intermediate energies

Author: F. Farzanpay, Michel Vetterli, J. Lisantti, K.H. Hicks, Z. Tang, M.J. Iqbal, F. E. Bertrand, I. Bergqvist, D.M. Drake, A. Brockstedt, Z. Xu, X.Y. Chen, D.J. Horen, D. K. McDaniels, and L.W. Swenson
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Angular range, Response model, Drop (liquid), Free surface, Nuclear Theory, Atomic physics, Nuclear Experiment, Spectral data, Nucleon, Excitation
Abstract: Analyzing power and spectral data for the inclusive quasifree ( p ,p ′) reaction on 208Pb at 290 MeV are presented. Cross sections were measured over an angular range of 4°–26° and for excitation energies up to 160 MeV. The free surface response model provides a good description of the shape of the continuum. At the quasifree peak the large angle Ay(θ) data drop below the free nucleon values. This difference is a possible indication of relativistic medium effects.
Published: 1988

31. P-Ay for excitation of natural and unnatural-parity states of 12C by 400 MeV protons

Author: R.L. Helmer, O. Häusser, S. Yen, K. P. Jackson, R.S. Henderson, R. Sawafta, J.R. Shepard, K.H. Hicks, A. Celler, C. A. Miller, R. Abegg, W.P. Alford, and J. Lisantti
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Isovector, Isoscalar, Excited state, Nuclear Theory, Parity (physics), Impulse (physics), Atomic physics, Polarization (waves), Excitation
Abstract: Differences of the polarization ( P ) and analyzing power ( A y ) have been measured between 5° and 14° for the lowest isoscalar 1 + and isovector 1 + and 2 + states in 12 C excited by 400 MeV protons. This is the first measurement of P - A y in an energy regime where the impulse approximation is most valid. Values of P - A y for all states are compared to both nonrelativistic and relativistic model calculations, which only qualitatively describe the data.
Published: 1988

32. The half-life of 197gPb

Author: T.E. Ward and K.H. Hicks
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Half-life, Atomic physics
Abstract: The half-life of 197g Pb was determined to be 6.2 ± 1.2 min by measuring the γ-decay ingrowth of 197g Pb from sources of 197m Pb (42 min). The sources were produced through the ( 6, 7 Li, x n) reaction on 197 Au using 69–95 MeV beams. Several ambiguities in the decây schemes were resolved based on these γ-decay data.
Published: 1980

33. Spin observables for 208Pb(→p, →p) elastic scattering at 290 MeV

Author: K.H. Hicks, C. A. Miller, O. Häusser, D.K. McDaniels, C.J. Horowitz, K. P. Jackson, L.W. Swenson, J. Lisantti, R. Sawafta, Robert Henderson, A. Celler, R. L. Helmer, D. J. Horen, R. Abegg, C. Gunther, and C.W. Glober
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, Spectrometer, Nuclear Theory, Momentum transfer, Polarimeter, Observable, Polarization (waves), Nuclear physics, symbols.namesake, Pauli exclusion principle, Amplitude, symbols, Atomic physics, Nuclear Experiment
Abstract: A newly constructed focal-plane polarimeter for the medium resolution spectrometer at TRIUMF has been used to measure polarizations and polarization transfer coefficients for protons elastically scattered from 208Pb at 290 MeV. These results combined with existing cross section data at 300 MeV completely determine the elastic scattering amplitudes for momentum transfers q
Published: 1987

34. Proton-induced inclusive pion production from light nuclei in the region of theΔ1232resonance

Author: S. Yen, K.H. Hicks, E. G. Auld, G. M. Huber, G.J. Lolos, R.D. Bent, P.L. Walden, and W. R. Falk
Subjects: Physics, Baryon, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, Pion, Proton, Meson, Hadron, Atomic physics, Kinetic energy, Delta baryon
Abstract: Proton-induced pion production to the continuum was investigated via the reactions /sup 13/C(p,..pi../sup -/)X, /sup 13/C(p,..pi../sup +/)X, and /sup 16/O(p-arrow-right,..pi../sup +/)X at bombarding proton energies of 250, 354, and 489 MeV, in the kinematic region where the pion has nearly its maximum allowable kinetic energy. Results from the /sup 16/O(p-arrow-right,..pi../sup +/)X reaction indicate that at small missing momenta the analyzing powers can be adequately described by a quasi-free p-arrow-rightp..-->..d..pi../sup +/ process, but as the missing momentum is increased this description becomes less accurate. The energy dependence of the cross section for the inclusive (p,..pi../sup +/) reactions is very similar to that of previously published exclusive (p,..pi../sup +/) data from the same target nuclei. The double differential cross sections for the ..pi../sup -/ data, however, exhibit an energy dependence different from that of the exclusive (p,..pi../sup -/) reaction.
Published: 1988

35. Inclusive analyzing power and scattering mechanisms in proton-nucleus scattering at backward angles

Author: K.H. Hicks, C. A. Miller, R.S. Henderson, C. Davis, S. Yen, D. Frekers, R. L. Helmer, J.S. Wesick, A. Moalem, K. P. Jackson, R. Abegg, and S.A. Gurvitz
Subjects: Physics, Nuclear and High Energy Physics, Quasielastic scattering, Proton, Scale (ratio), Scattering, Nuclear Theory, Scattering length, Electron, Inelastic scattering, Nuclear physics, Pion, Atomic physics, Nuclear Experiment
Abstract: Energy distributions of A y at backward angles are found to be identical for inclusive proton scattering from Be and C at 303 MeV. While the cross sections scale in the y -variable of West in the same way as electron and pion scattering, the A y values are on the average small and energy dependent, at variance with those expected for a single scattering mechanism.
Published: 1987

36. A highly efficient polarimeter for the medium resolution spectrometer at TRIUMF

Author: G. Waters, D. A. Hutcheon, O. Häusser, R. Sawafta, R. Henderson, C. Günther, D. Clark, and K.H. Hicks
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Scattering, Nuclear Theory, Polarimeter, Azimuth, Nuclear physics, Momentum, Cardinal point, Optics, Deuterium, Detectors and Experimental Techniques, Polar coordinate system, Nuclear Experiment, business, Instrumentation
Abstract: A polarimeter which uses inclusive scattering from carbon has been mounted after the focal plane of the TRIUMF medium resolution spectrometer. Four drift chambers measure scatterings at all azimuthal angles out to 20° in polar angle over a spectrometer momentum acceptance of ± 5%. A microprocessor rejects events with small scattering angles. The efficiency for 400 MeV protons is 4%, and for 295 MeV deuterons is 1.5%. Analyzing powers for protons are similar to those previously reported for polarimeters of this type.
Published: 1987

37. Spin-transfer measurements for the reaction at 250 MeV

Author: R. Sawafta, K.H. Hicks, R.S. Henderson, O. Häusser, C. A. Miller, R. Abegg, K. P. Jackson, S. Yen, J. Lisantti, Michel Vetterli, and W.P. Alford
Subjects: Nuclear physics, Momentum, Physics, Nuclear and High Energy Physics, Nuclear Theory, SHELL model, Spin transfer, Atomic physics, Nuclear Experiment, Excitation
Abstract: For the 24 Mg ( →p . →p ′) reaction at Ep=250 MeV and small momentum transfers we have measured cross sections, analysing powers and spin-transfer probabilities up to 40 MeV of excitation in 24Mg. Because of the strong suppression of the S=0 excitations in the spin-flip cross sections, the analogs of Gamow-Teller transitions could be cleanly observed. Up to Eexc=15 MeV about 80% of the L=0 strength predicted by large-scale shell model calculations has been found.
Published: 1988

38. Decays ofPb194,195,196

Author: K.H. Hicks, Chris Fields, F. W. N. de Boer, T.E. Ward, and J. Wiggins
Subjects: Nuclear physics, Nuclear reaction, Rotational model, Physics, Nuclear and High Energy Physics, Particle properties, Isotope, Analytical chemistry, Half-life, Gamma spectroscopy, Spectroscopy, Beta decay
Abstract: Decay properties of /sup 194,195,196/Pb were studied using singles and coincident ..gamma..-ray spectroscopy. Sources were produced by the 95 MeV /sup 197/Au(/sup 6/Li,xn) reactions. No direct evidence for the decay of a low-spin isomer of /sup 195/Pb was observed. Several new levels were observed in /sup 195,196/Tl, and are interpreted in terms of a rotational model.
Published: 1982

39. Excitation of giant resonances inSi28with 250 MeV protons

Author: D.J. Horen, B. L. Burks, D. K. McDaniels, O. Häusser, J. Lisantti, X.Y. Chen, L.W. Swenson, F. E. Bertrand, K.H. Hicks, and CW Glover
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Isovector, Proton, Isoscalar, Nuclear Theory, Resonance, Inelastic scattering, Nuclear physics, Giant resonance, Atomic physics, Born approximation, Nuclear Experiment
Abstract: Differential cross section measurements have been made for 250 MeV proton inelastic scattering from /sup 28/Si. Hadronic deformation lengths for the states at 1.78 (2/sup +/), 4.62 (4/sup +/), 6.8 (3/sup -/ and 4/sup +/), 9.70 (5/sup -/), and 10.2 MeV (3/sup -/) have been extracted using a first-order vibration model distorted-wave Born approximation description. Deformation lengths for the 2/sup +/ and 4/sup +/ states are found to be independent of proton energy from 40 to 500 MeV. Cross sections for the excitation of the giant resonance region are found to be highly fragmented between 16 to 25 MeV. This region of excitation is found to contain an energy weighted sum rule depletion of 70% for the isovector giant dipole resonance, 26% for the isoscalar giant quadrupole resonance, and 5% for the isoscalar hexadecapole resonance. No structure was observed in the inelastic continuum region of 25 to 45 MeV of excitation energy.
Published: 1988

40. Analyzing powers and cross sections of inclusive polarized proton scattering on 208Pb

Author: Z. Tang, L.W. Swenson, J. Lisantti, D. K. McDaniels, K.H. Hicks, X.Y. Chen, A. Brockstedt, F. Farzanpay, M.J. Iqbal, Z. Xu, D.J. Horen, Michel Vetterli, D.M. Drake, F. E. Bertrand, and I. Bergqvist
Subjects: Nuclear reaction, Physics, Nuclear physics, Nuclear and High Energy Physics, Angular range, Scattering, Proton scattering, Nuclear Theory, Atomic physics, Born approximation, Impulse (physics), Excitation
Abstract: Inclusive polarized proton-nucleus scattering on 208 Pb has been studied at 290 and 500 MeV. The measurements cover a broad range (0–250 MeV) of excitation energy over the 4°–27° angular range. The measured analyzing powers and cross sections for the continuum were compared with recent relativistic and nonrelativistic distorted-wave impulse approximation calculations. The cross section in the continuum region is found to be dominated by single-step quasi-free scattering. Differences of up to 40% between the analyzing powers measured at the quasi-free peak as opposed to free NN values strongly support the relativistic impulse approximation predictions for the quasi-free region, and indicate the presence of relativistic medium effects. Analyzing powers and cross sections of several low-lying states were compared with both nonrelativistic and relativistic distorted-wave Born approximation predictions.
Published: 1989

41. Fission of heavy nuclei induced by energetic pions

Author: P.D. Kunz, J.N. Bradbury, R. J. Peterson, R.G. Jeppesen, J. L. Ullmann, K.H. Hicks, R.A. Ristinen, Fredrick D. Becchetti, M. Paciotti, J. J. Kraushaar, and R.S. Raymond
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Cold fission, Cluster decay, Fission, Nuclear Theory, Nuclear physics, Pion, Physics::Atomic and Molecular Clusters, Mass spectrum, Atomic physics, Nuclear Experiment, Nucleon, Excitation
Abstract: Fission of /sup 238/U, /sup 209/Bi and /sup 197/Au induced by both positive and negative pion beams at incident energies of 60 to 100 MeV is examined. Energy and mass spectra and angular correlations of coincident fission fragments are compared to theoretical calculations and to other data. Excitation energies of the fissioning systems in excess of 100 MeV are deduced, implying that the fission examined in this study is caused primarily by true absorption of the pion. The masses of the coincident fission fragments are found to have a wider distribution than those from fissioning systems of similar excitation energy induced by nucleon beams. The fission cross sections are close to the reaction cross sections for /sup 238/U and scale with the fissility for the other nuclei studied.
Published: 1985

42. Thin-film cryogenic accelerator targets

Author: Fredrick D. Becchetti, K.H. Hicks, and Chris Fields
Subjects: Nuclear physics, Materials science, Condensation, General Engineering, Analytical chemistry, Thin film
Abstract: Thin-film accelerator targets (0.1 mg/cm 2 δx 2 ) produced by condensation of various gases (Ar, Kr, Xe, N 2 , etc.) onto thin, cryogenically cooled substrates ( T = 20 K to 80 K) have been developed and tested in-beam with 35 MeV 4 He.
Published: 1982

43. Spin‐isospin nuclear response

Author: K.H. Hicks
Subjects: Elastic scattering, Nuclear physics, Physics, Nuclear reaction, Particle physics, Isovector, Scattering, Isospin, Isoscalar, Nuclear Theory, Nuclear force, Nuclear Experiment, Nucleon
Abstract: The scattering of protons off individual nucleons in the nucleus, known as ‘quasi‐free’ scattering, gives information on the modification of the nuclear force inside the nuclear medium. In order to extract this information, we need to know the nucleon‐nucleon (N‐N) interaction in free space, and the propagation of the proton through the nucleus (from elastic scattering). Direct comparison of the analyzing powers and polarizations for quasi‐free scattering as opposed to N‐N scattering show large (40%) differences. Conventional (non‐relativistic) calculations are unable to reproduce this effect. Relativistic calculations, which use large, opposing vector and scalar potentials reproduce this effect for both isoscalar and isovector inclusive reactions and for exclusive (p, 2p) reactions.
Published: 1988

44. Multipole matrix elements for 208Pb

Author: F.E. Bertrand, X.Y. Chen, K.H. Hicks, O. Häusser, E.E. Gross, CW Glover, D. K. McDaniels, L. W. Swenson, J. Lisantti, R. Sayer, B. L. Burks, and D. J. Horen
Subjects: Nuclear reaction, Physics, Proton, Scattering, Nuclear Theory, Inelastic scattering, Nuclear physics, Excited state, Physics::Accelerator Physics, Neutron, Atomic physics, Born approximation, Nuclear Experiment, Multipole expansion
Abstract: New measurements of inelastic proton scattering to low-lying states of /sup 208/Pb at 200 and 400 MeV are reported. Deformation lengths extracted from angular distributions for the 3/sup -/ (2.614 MeV), 5/sub 1//sup -/ (3.198 MeV), 5/sub 2//sup -/ (3.209 MeV), 2/sup +/ (4.086 MeV) and 4/sup +/ (4.324 MeV) states are in good accord with values extracted at other incident proton energies. The fact that the deformation lengths are independent of incident proton energy within experimental uncertainty provides support for the validity of the collective DWBA for medium energy proton scattering to strongly excited states. Advantage is taken of this to extract statistically more precise values of the ratio of neutron to proton multipole matrix elements (M/sub n//M/sub p/). Different methods of determining the appropriate average value of M/sub n//M/sub p/ are discussed. 3 refs., 1 tab.
Published: 1986

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