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14 results on '"S. J. Gaff"'

1. Breakup temperature of target spectators in 197Au + 197Au collisions at E/A = 1000 MeV

Author

Hongfei Xi, T. Odeh, R. Bassini, M. Begemann-Blaich, A. S. Botvina, S. Fritz, S. J. Gaff, C. Groß, G. Immé, I. Iori, U. Kleinevoß, G. J. Kunde, W. D. Kunze, U. Lynen, V. Maddalena, M. Mahi, T. Möhlenkamp, A. Moroni, W. F. J. Müller, C. Nociforo, B. Ocker, F. Petruzzelli, J. Pochodzalla, G. Raciti, G. Riccobene, F. P. Romano, Th. Rubehn, A. Saija, M. Schnittker, A. Schüttauf, C. Schwarz, W. Seidel, V. Serfling, C. Sfienti, W. Trautmann, A. Trzcinski, G. Verde, A. Wörner, and B. Zwieglinski

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Nuclear Theory, Inverse, Breakup, Charged particle, Spectral line, Nuclear physics, Impact parameter, Atomic physics, Nuclear Experiment, Nucleon, Excitation
Abstract

Breakup temperatures were deduced from double ratios of isotope yields for target spectators produced in the reaction Au + Au at 1000 MeV per nucleon. Pairs of $^{3,4}$He and $^{6,7}$Li isotopes and pairs of $^{3,4}$He and H isotopes (p, d and d, t) yield consistent temperatures after feeding corrections, based on the quantum statistical model, are applied. The temperatures rise with decreasing impact parameter from 4 MeV for peripheral to about 10 MeV for the most central collisions. The good agreement with the breakup temperatures measured previously for projectile spectators at an incident energy of 600 MeV per nucleon confirms the observed universality of the spectator decay at relativistic bombarding energies. The measured temperatures also agree with the breakup temperatures predicted by the statistical multifragmentation model. For these calculations a relation between the initial excitation energy and mass was derived which gives good simultaneous agreement for the fragment charge correlations. The energy spectra of light charged particles, measured at $\theta_{lab}$ = 150$^{\circ}$, exhibit Maxwellian shapes with inverse slope parameters much higher than the breakup temperatures. The statistical multifragmentation model, because Coulomb repulsion and sequential decay processes are included, yields light-particle spectra with inverse slope parameters higher than the breakup temperatures but considerably below the measured values. The systematic behavior of the differences suggests that they are caused by light-charged-particle emission prior to the final breakup stage. PACS numbers: 25.70.Mn, 25.70.Pq, 25.75.-q

Published
1997

2. Isospin dependence of intermediate mass fragment production in heavy-ion collisions atE/A=55 MeV

Author

T. Glasmacher, W. Skulski, M. J. Huang, W. G. Lynch, W. A. Friedman, J. Dempsey, L. G. Sobotka, Jan Toke, L. Martin, Dileep Agnihotri, W. U. Schröder, R. Lemmon, L. Manduci, M. B. Tsang, G. J. Kunde, C. K. Gelbke, B. Djerroud, S. J. Gaff, and R. J. Charity

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Projectile, Nuclear Theory, Charged particle, Baryon, Nuclear physics, Isotopes of tin, Neutron, Atomic physics, Nuclear Experiment, Nucleon, Ternary fission
Abstract

The production of intermediate mass fragments (IMF's) from the four reactions 55A MeV $^{124,136}\mathrm{Xe}$ + $^{112,124}\mathrm{Sn}$ is studied with an experimental apparatus which is highly efficient for the detection of both charged particles and neutrons. The IMF's are more localized in the midvelocity region than are the light charged particles, and the detected multiplicity of IMF's depends linearly on the charge lost from the projectile and increases with the neutron excess of the system. Remnants of the projectile, with very little velocity reduction, are found for most of the reaction cross section. Isotopic and isobaric fragment yields in the projectile-velocity region indicate that charge-to-mass ratio neutralization is generally not achieved but is approached when little remains of the projectile. For all systems, the fragments found in the midvelocity region are substantially more neutron rich than those found in the velocity region dominated by the emission from the projectile. This observation can be accounted for if the midvelocity source (or sources) is either more neutron rich or smaller, with the same neutron-to-proton ratio, than the source with the velocity of the projectile. Taken together, the observations of this work suggest that the intermediate mass fragments are, to a large extent, formed by multiple neck rupture of the overlap material, a process which might enhance the neutron-to-proton ratio of the primary source material and/or limit the size of the sources. This scenario is reminiscent of low-energy ternary fission and one predicted by Boltzmann-Uehling-Uhlenbeck calculations. However, these calculations predict too much velocity damping of the projectile remnant. The calculations improve, in this regard, when the in-medium nucleon-nucleon cross sections and the cost of creating low density material are reduced. \textcopyright{} 1996 The American Physical Society.

Published
1996

3. Thermal and Chemical Freeze-out in Spectator Fragmentation

Author

W. Trautmann, 1 R. Bassini, 2 M. Begemann-Blaich, 1 A. Ferrero, 2 S. Fritz, 1 S. J. Gaff-Ejakov, 3 C. Groß, 1 G. Imm´e, 4 I. Iori, 2 U. Kleinevoß, 1 G. J. Kunde, 3, 8 W. D. Kunze, 1 A. Le F`evre, 1 V. Lindenstruth, 1, 9 J. ?ukasik, 10 U. Lynen, 1 V. Maddalena, 4 M. Mahi, 1 T. M¨ohlenkamp, 5 A. Moroni, 2 W. F. J. M¨uller, 1 C. Nociforo, 4 B. Ocker, 6 T. Odeh, 1 H. Orth, 1 F. Petruzzelli, 2 J. Pochodzalla, 11 G. Raciti, 4 G. Riccobene, 4 F. P. Romano, 4 Th. Rubehn, 1 A. Saija, 4 H. Sann, M. Schnittker, 1 A. Sch¨uttauf, 6 C. Schwarz, 1 W. Seidel, 5 V. Serfling, 6 C. Sfienti, 1 A. Trzcnski, 7 A. Tucholski, 7 G. Verde, 4 A. W¨orner, 1 Hongfei Xi, and B. Zwieglinski7

Subjects
Physics, Nuclear and High Energy Physics, Hydrogen, Nuclear Theory, chemistry.chemical_element, Resonance, FOS: Physical sciences, Nuclear physics, Helium-4, chemistry, Fragmentation (mass spectrometry), Excited state, Physics::Atomic Physics, Beryllium, Atomic physics, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment, Helium
Abstract

Isotope temperatures from double ratios of hydrogen, helium, lithium, beryllium, and carbon isotopic yields, and excited-state temperatures from yield ratios of particle-unstable resonances in 4He, 5Li, and 8Be, were determined for spectator fragmentation, following collisions of 197Au with targets ranging from C to Au at incident energies of 600 and 1000 MeV per nucleon. A deviation of the isotopic from the excited-state temperatures is observed which coincides with the transition from residue formation to multi-fragment production, suggesting a chemical freeze-out prior to thermal freeze-out in bulk disintegrations., Comment: 14 pages, 10 figures, submitted to Phys. Rev. C, small changes as suggested by the editors and referees

Published
2007
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4. 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

5. Measurement of the polarized structure functionσLT′forp(e⃗,e′π+)nin theΔ(1232)resonance region

Author

K. Joo, L. C. Smith, I. G. Aznauryan, V. D. Burkert, R. Minehart, G. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, V. Batourine, M. Battaglieri, K. Beard, M. Bektasoglu, N. Benmouna, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, S. Chen, L. Ciciani, P. L. Cole, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. De Sanctis, R. DeVita, P. V. Degtyarenko, L. Dennis, A. Deur, 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. Fersch, R. J. Feuerbach, T. A. Forest, H. Funsten, S. J. Gaff, M. Garçon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, J. Hu, C. E. Hyde-Wright, Y. Ilieva, D. Ireland, M. M. Ito, D. Jenkins, H. G. Juengst, J. D. Kellie, J. H. Kelley, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, V. Koubarovski, L. H. Kramer, S. E. Kuhn, J. Kuhn, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, T. Lee, K. Livingston, K. Lukashin, J. J. Manak, C. Marchand, S. McAleer, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, L. Morand, S. A. Morrow, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. O. Nelson, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O’Rielly, M. Osipenko, A. I. 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, F. Ronchetti, G. Rosner, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, K. Sabourov, 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, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, S. S. Stepanyan, B. E. 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, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, and L. Zana

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Elementary particle, 01 natural sciences, Delta baryon, Baryon, Pion, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The polarized longitudinal-transverse structure function {sigma}{sub LT{sup '}} has been measured using the p(e-vector,e{sup '}{pi}{sup +})n reaction in the {delta}(1232) resonance region at Q{sup 2}=0.40 and 0.65 GeV{sup 2}. No previous {sigma}{sub LT{sup '}} data exist for this reaction channel. The kinematically complete experiment was performed at the Jefferson Lab with the CEBAF large acceptance spectrometer using longitudinally polarized electrons at an energy of 1.515 GeV. A partial-wave analysis of the data shows generally better agreement with recent phenomenological models of pion electroproduction compared to the previously measured {pi}{sup 0}p channel. A fit to both {pi}{sup 0}p and {pi}{sup +}n channels using a unitary isobar model suggests the unitarized Born terms provide a consistent description of the nonresonant background. The t-channel pion pole term is important in the {pi}{sup 0}p channel through a rescattering correction, which could be model dependent.

Published
2004

6. Two-proton correlations forO16+Au197collisions atE/A=200 MeV

Author

Eugene Gualtieri, R. Lacey, M. J. Huang, C. P. Montoya, S. Hannuschke, F. Daffin, Kevin Haglin, M. B. Tsang, R. Pak, T. Glasmacher, C. K. Gelbke, L. Martin, W. G. Lynch, G. J. Kunde, G. D. Westfall, N. T. B. Stone, S. J. Gaff, Scott Pratt, J. Yee, D. O. Handzy, Wolfgang Bauer, and A. M. Vander Molen

Subjects
Baryon, Nuclear reaction, Momentum, Physics, Nuclear and High Energy Physics, Correlation function, Proton, Nuclear Theory, Hadron, Elementary particle, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Two-proton correlation functions are measured for inclusive collisions of $^{16}\mathrm{O}$ + $^{197}\mathrm{Au}$ at E/A=200 MeV. Calculations with the Boltzmann-Uehling-Uhlenbeck transport theory overpredict the dependence of the correlation function on the total momentum of the coincident proton pair, but correctly reproduce the energy-integrated correlation function.

Published
1995

7. Measurement of the Proton Spin Structure Functiong1(x,Q2)forQ2from 0.15 to1.6 GeV2with CLAS

Author

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

Subjects
Physics, Nuclear physics, Particle physics, Scattering, Proton spin crisis, General Physics and Astronomy, Electron, Nucleon, Parametrization, Resonance (particle physics), Scaling, Sign (mathematics)
Abstract

Double-polarization asymmetries for inclusive $ep$ scattering were measured at Jefferson Lab using 2.6 and 4.3 GeV longitudinally polarized electrons incident on a longitudinally polarized NH$_3$ target in the CLAS detector. The polarized structure function $g_1(x,Q^2)$ was extracted throughout the nucleon resonance region and into the deep inelastic regime, for $Q^2 = 0.15 -1.64 $GeV$^2$. The contributions to the first moment $\Gamma_1(Q^2) = \int g_1(x,Q^2)dx$ were determined up to $Q^2=1.2$ GeV$^2$. Using a parametrization for $g_1$ in the unmeasured low $x$ regions, the complete first moment was estimated over this $Q^2$ region. A rapid change in $\Gamma_1$ is observed for $Q^2 < 1 $GeV$^2$, with a sign change near $Q^2 = 0.3 $GeV$^2$, indicating dominant contributions from the resonance region. At $Q^2=1.2$ GeV$^2$ our data are below the pQCD evolved scaling value.

Published
2003

8. Kinematically complete measurement of the proton structure functionF2in the resonance region and evaluation of its moments

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Proton, Momentum transfer, Moment (physics), Bibliography, Twist, Nucleon, Resonance (particle physics)
Abstract

We measured the inclusive electron-proton cross section in the nucleon resonance region (W From these data we extracted the structure function F2 and, by including other world data, we studied the Q2 evolution of its moments, Mn(Q2), in order to estimate higher twist contributions. The small statistical and systematic uncertainties of the CLAS data allow a precise extraction of the higher twists and will require significant improvements in theoretical predictions if a meaningful comparison with these new experimental results is to be made.

Published
2003

9. 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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10. Fragment Kinetic Energies and Modes of Fragment Formation

Author

B. Ocker, A. Schüttauf, W. Trautmann, M. Schnittker, V. Maddalena, Giuseppe Verde, A. Trzcinski, Gerd Joachim Kunde, A. Wörner, Giorgio Riccobene, Francesco Romano, D. Gourio, B. Zwieglinski, Giuseppina Raciti, I. Iori, C. Sfienti, S. Fritz, S. J. Gaff-Ejakov, Hongfei Xi, F. Petruzzelli, Cornelius Schwarz, T. Odeh, J. Pochodzalla, W. D. Kunze, U. Kleinevoß, T. Möhlenkamp, A. Saija, U. Lynen, W. F. J. Müller, A. Moroni, C. Nociforo, M. Mahi, W. Seidel, M.L. Begemann-Blaich, G. Imme, V. Serfling, C. Groß, and R. Bassini

Subjects
Physics, HEAVY-ION COLLISIONS, HE-3+ AG-NAT, STATISTICAL MULTIFRAGMENTATION, SPECTATOR FRAGMENTATION, AU-197 REACTIONS, PROTON-NUCLEUS, GOLD, TEMPERATURES, CLUSTERS, MATTER, Nuclear Theory, Degrees of freedom (physics and chemistry), Evaporation, General Physics and Astronomy, FOS: Physical sciences, Breakup, Kinetic energy, Spectral line, Particle, Atomic physics, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment, Fermi Gamma-ray Space Telescope
Abstract

Kinetic energies of light fragments A, 11 pages, with 4 included figures; Accepted by Phys. Rev. Lett.; Also available from http://www-kp3.gsi.de/www/kp3/aladin_publications.html

Published
2000
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11. Temperature measurement of fragment emitting systems in Au+Au 35 MeV/nucleon collisions

Author

C. P. Montoya, G. Vannini, Giacomo Vito Margagliotti, I. Iori, J. D. Dinius, F. Tonetto, A. S. Botvina, M. D'Agostino, M. J. Huang, Hongfei Xi, P. F. Mastinu, M. L. Fiandri, D. Fontana, A. Moroni, W. G. Lynch, M. Azzano, L. Martin, T. Glasmacher, M. Bruno, S. J. Gaff, C. K. Gelbke, P. M. Milazzo, Rinaldo Rui, Nicola Colonna, F. Gramegna, Gerd Joachim Kunde, P., Milazzo, G., Vannini, D., Fontana, Margagliotti, Giacomo, P. F., Mastinu, Rui, Rinaldo, F., Tonetto, and N., Colonna

Subjects
Physics, Nuclear and High Energy Physics, temperature, heavy ions, Nuclear matter, Temperature measurement, heavy ion, Nuclear physics, Fragmentation (mass spectrometry), Excited state, Atomic physics, Impact parameter, Nuclear Experiment, Nucleon, Data selection, Excitation
Abstract

We report on the results of experiments performed to investigate the Au1Au 35 MeV/nucleon reaction. The reaction products generated in the disassembly of the unique source formed in central collisions and those coming from the decay of the quasiprojectile in peripheral and midperipheral ones ~five different impact parameters! were identified through a careful data selection based on the study of energy and angular distributions. The excitation energies of the fragment sources have been extracted through a calorimetric method and by means of a comparison with model calculations. The nuclear temperatures of these decaying systems have been measured from the relative isotopic abundances and, also for central collisions, from the relative populations of excited states. The temperatures of the quasiprojectile disassembling systems are slowly increasing going towards smaller impact parameter. The relationship between temperature and excitation energy seems to be almost independent of the characteristics of the emitting source. The extracted caloric curve shows a slow monotonic increase with increasing excitation energy. A comparison with data derived from Au fragmentation at much higher incident energies is discussed. @S0556-2813~98!04408-2#

Published
1998

12. Understanding proton emission in central heavy-ion collisions

Author

Eugene Gualtieri, A. M. Vander Molen, T. Li, Sherry Yennello, C. P. Montoya, S. J. Gaff, Graham F. Peaslee, T. Glasmacher, C. K. Gelbke, Gary Westfall, M. B. Tsang, G. J. Kunde, R. Pak, R. Lacey, W. J. Llope, L. Martin, M. A. Lisa, C. Schwarz, S. Hannuschke, W. G. Lynch, M. J. Huang, F. Daffin, N. T. B. Stone, Scott Pratt, J. Yee, Wolfgang Bauer, and D. O. Handzy

Subjects
Physics, Nuclear reaction, Baryon, Nuclear physics, Hadron, General Physics and Astronomy, Elementary particle, Fermion, Atomic physics, Proton emission, Nucleon, Charged particle, Nuclear Physics
Abstract

Two-proton correlation functions for central collisions of {sup 36}Ar+{sup 45}Sc at {ital E}/{ital A}=80, 120, and 160 MeV are compared to calculations with the Boltzmann-Uehling-Uhlenbeck (BUU) transport model. Agreement is found at {ital E}/{ital A}=80MeV, but the model predicts too large correlations at {ital E}/{ital A}=120 and 160 MeV. The discrepancy may be due to delayed emission of protons from particle-unstable states not modeled in BUU. {copyright} {ital 1995} {ital The} {ital American} {ital Physical} {ital Society}.

Published
1995

13. Probing toroidal density distributions with two-proton correlation functions?

Author

F. Daffin, D. O. Handzy, C. K. Gelbke, Wolfgang Bauer, S. J. Gaff, and G. J. Kunde

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Proton, Nuclear Theory, Hadron, Elementary particle, Fermion, Breakup, Baryon, Atomic physics, Nuclear Experiment, Nucleon, Nuclear Physics
Abstract

Transport calculations based on the Boltzmann-Uehling-Uhlenbeck (BUU) equation predict the formation of toroidal density distributions for central [sup 36]Ar+[sup 45]Sc collisions at [ital E]/[ital A]=80 MeV. Calculations with the Koonin-Pratt formalism are performed to explore whether the occurrence of such nonspherical breakup configurations could be tested via two-proton correlation measurements. The predicted signal appears detectable, but weak, because most protons emerge early in the reaction when the source is more compact. Contributions from nonzero impact parameters give rise to additional complications.

Published
1994

14. Photoproduction of the ω meson on the proton at large momentum transfer

Author

M. Battaglieri, M. Brunoldi, R. De Vita, J. M. Laget, M. Osipenko, M. Ripani, M. Taiuti, G. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, D. S. Armstrong, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, S. Barrow, K. Beard, M. Bektasoglu, B. L. Berman, A. Bersani, N. Bianchi, A. S. Biselli, S. Boiarinov, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, J. R. Calarco, G. P. Capitani, D. S. Carman, B. Carnahan, A. Cazes, C. Cetina, P. L. Cole, A. Coleman, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. DeSanctis, P. V. Degtyarenko, R. Demirchyan, H. Denizli, L. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, L. Farhi, R. J. Feuerbach, J. Ficenec, T. A. Forest, A. P. Freyberger, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, M. Garcon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, E. Golovach, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, C. E. Hyde-Wright, M. M. Ito, K. Joo, J. H. Kelley, M. Khandaker, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, S. E. Kuhn, J. Lachniet, D. Lawrence, M. Lucas, K. Lukashin, R. W. Major, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, S. Morrow, M. U. Mozer, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, S. O. Nelson, S. Niccolai, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, J. T. O’Brien, A. K. Opper, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, D. Protopopescu, L. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, B. G. Ritchie, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, K. Sabourov, C. Salgado, V. Sapunenko, R. A. Schumacher, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, A. V. Skabelin, E. S. Smith, T. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, P. Stoler, S. Taylor, D. J. Tedeschi, L. Todor, U. Thoma, R. Thompson, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. Wood, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, and Z. Zhou

Subjects
Physics, Particle physics, Proton, Meson, Hadron, Momentum transfer, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, Gluon, High Energy Physics - Experiment, Nuclear physics, Baryon, Pion, High Energy Physics::Experiment, Nucleon, Nuclear Experiment
Abstract

The differential cross section, $d\sigma/dt$ for $\omega$ meson exclusive photoproduction on the proton above the resonance region ($2.6, Comment: 5 pages, 5 figures

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