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1. Electroproduction of kaons on light nuclei

Author

R. Sawafta, J. H. Liu, John C. Mitchell, T. Eden, C. Yan, D. G. Meekins, E. Christy, F. Dohrmann, P. Ambrozewicz, L. Cole, M. Sarsour, A. Ahmidouch, Y. Sato, P. E. Reimer, S. Tajima, J. A. Dunne, J. Roche, S. Danagoulian, Kevin Bailey, B. Mueller, J. W. Price, W. Hinton, N. S. Chant, H. Mkrtchyan, J. Crowder, H. Juengst, Haiyan Gao, John Arrington, G. Savage, C. Cothran, J. P. Schiffer, B. Zihlmann, M. Zeier, H. C. Fenker, J.-O. Hansen, Paul Gueye, Rolf Ent, R. D. Carlini, Brian Raue, R. Asaturyan, L. Gan, W. J. Cummings, A. Semenov, D. F. Geesaman, J. Cha, D. S. Brown, M. Elaasar, A. Cochran, H. Breuer, Dipangkar Dutta, Pete Markowitz, L. Yuan, J. Reinhold, H. Bitao, A. Uzzle, K. Gustafsson, B. Terburg, F. Duncan, S. Stepanyan, P. G. Roos, Ketevi Assamagan, Avraham Klein, G. Collins, Thomas O'Neill, D. Potterveld, V. Tadevosian, K. Garrow, H. E. Jackson, D. Koltenuk, C. S. Armstrong, Y. Liang, O. K. Baker, I. Niculescu, B. Zeidman, A. F. Lung, G. Niculescu, Toshinobu Miyoshi, H. Yamaguchi, R. Madey, D. Abbott, L. Ewell, H. T. Fortune, Y. Fujii, K. Hafidi, R. E. Segel, S. Beedoe, S. Mtingwa, C. J. Martoff, R. Mohring, C. E. Keppel, S. A. Wood, D. J. Mack, Stephen Avery, and L. G. Tang

Subjects
Physics, Nuclear and High Energy Physics, Meson, Proton, Helium-3, Hadron, Production (computer science), Elementary particle, Atomic physics, Nuclear Experiment, Lambda, Isotopes of helium
Abstract

The A(e,e{prime}K{sup +})YX reaction on H, D, {sup 3}He, and {sup 4}He was investigated in Hall C at CEBAF. Data were obtained for Q{sup 2} {approx} 0.35 and 0.5 GeV{sup 2} at 3.245 GeV. The missing mass spectra for both H and D are fitted with Monte-Carlo simulations incorporating peaks corresponding to {Lambda} production on the proton and {Sigma} production on both the proton and neutron. For D, the cross section ratio {Sigma}{sup 0}/{Sigma}{sup {minus}} {approx} 2, and excess yield close to the thresholds for {Lambda} and {Sigma} production can be attributed to final-state interactions that are compared to the data. The analysis of the data for the He targets is in a more preliminary state with broader quasi-free peaks resulting from the higher Fermi momenta. Evidence for bound {Lambda}-hypernuclear states is seen and other structure may be present.

Published
2001
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2. Electroproduction of kaons and light hypernuclei

Author

John C. Mitchell, Y. Liang, T. Eden, Thomas O'Neill, D. F. Geesaman, R. E. Segel, L. Ewell, J. Cha, H. Bitao, E. Christy, Ketevi Assamagan, M. Sarsour, J. Crowder, L. Cole, J. W. Price, S. Danagoulian, Dipangkar Dutta, H. Juengst, H. Yamaguchi, H.T. Fortune, D. Koltenuk, N. Chant, J. H. Liu, D. Abbott, R. Asaturyan, D. G. Meekins, W. Hinton, T. Miyoshi, J. Roche, Brian Raue, Paul Gueye, W. U. Boeglin, J. Reinhold, Pete Markowitz, J.-O. Hansen, L. G. Tang, R. Mohring, R. Sawafta, K. Garrow, J. P. Schiffer, C. E. Keppel, C. J. Martoff, C. Cothran, John Arrington, Kevin Bailey, C. Yan, B. Zihlmann, H. C. Fenker, B. Terburg, C. S. Armstrong, P. Roos, Y. Sato, Rolf Ent, S. Tajima, B. Mueller, P. Ambrozewicz, G. Savage, S. Stepanyan, D. S. Brown, A. Uzzle, O. K. Baker, Avraham Klein, A. Cochran, H. Mkrtchyan, A. Semenov, L. Gan, W. J. Cummings, G. Collins, F. Duncan, K. Gustafsson, F. Dohrmann, Y. Fujii, R. Madey, M. Zeier, J. A. Dunne, A. Ahmidouch, R. D. Carlini, S. A. Wood, A. F. Lung, D. J. Mack, L. Yuan, S. Beedoe, M. Elaasar, Stephen Avery, G. Niculescu, I. Niculescu, D. Potterveld, V. Tadevosian, S. Mtingwa, H. Breuer, K. Hafidi, Haiyan Gao, H. E. Jackson, P. E. Reimer, B. Zeidman, and (Astro)-Particles Physics

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Deuterium, Production (computer science), Electron, Nucleon, Fundamental interaction
Abstract

A detailed investigation of the basic hyperon-nucleon interactions in nuclei is one of the aims of Experiment 91-016, approved with high priority at CEBAF, to study the electroproduction of kaons on targets of deuterium, {sup 3}He, and {sup 4}He. Inasmuch as both the electron and K{sup +} are particles that interact relatively weakly with nucleons, electroproduction of light hypernuclei provides a low-distortion method for investigating the fundamental interactions between nucleons, {Alpha}`s, and {Epsilon}`s in few-body systems. In particular, the (e,e`K{sup +}) reactions on cryogenic targets of D, {sup 3}He, and {sup 4}He will be studied at incident electron energies near 3 GeV with coincident detection of the emergent e and K{sup +} in the HMS and SOS magnetic spectrometers in Hall C. Construction of the He target, operating at {approximately}10 atm, {approximately}50 K and capable of dissipating {approximately}30 W, is expected to be complete prior to commencement of production runs in Hall C. The first data runs for E91-016, expected to begin late in FY 1995, will also be the basis for a doctoral thesis at Hampton University. In addition to providing new information on the phases of hyperon-nucleon interactions, measurements of cross sections for hypernuclear formation, and interference phenomena,more » the data may provide evidence for the presence of bound {Epsilon}`s and strange di-baryonic states that are the subject of considerable theoretical discussion.« less

Published
2001
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