First measurement of the reaction [sup 3]He([rvec [gamma]],[ital p])[ital X] with polarized photons

Journal Article · Mon Jan 31 04:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.617· OSTI ID:5237786

Ruth, C; Adams, G S; Baghaei, H; Caracappa, A; Clayton, W B; D'Angelo, A; Duval, M; Giordano, G; Hoblit, S; Kistner, O C; Laget, J M; Lindgren, R; Matone, G; Miceli, L; Mize, W K; Moinester, M A; Sandorfi, A M; Schaerf, C; Sealock, R M; Smith, L C ; Stoler, P; Tedeschi, D J; Teng, P K; Thorn, C E; Thornton, S T; Vaziri, K; Whisnant, C S; Winhold, E J ^[1]

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1. Department of Physics; Brookhaven National Laboratory; Upton; New York 11973 (United States) Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali di Frascati; Frascati (Italy) Department of Physics; Rensselaer Polytechnic Institute; Troy; New York 12180-3590 (United States) Istituto Nazionale di Fisica Nucleare and University of Rome Tor Vergata; via della Ricerca Scientifica; 00133 Rome (Italy) Institute of Physics; Academia Sinica; Taipei (Taiwan; Province of China) Department of Physics; University of South Carolina; Columbia; South Carolin a 29208 (United States) School of Physics and Astronomy; Tel A

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

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5237786
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:5; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

663410* -- Photonuclear Reactions & Photon Scattering-- (1992-)
663450 -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ASYMMETRY
BARYONS
BEAMS
CROSS SECTIONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HELIUM 3 TARGET
NUCLEAR REACTIONS
NUCLEONS
PHOTONUCLEAR REACTIONS
POLARIZED BEAMS
PROTONS
SORPTION
TARGETS