Separation of [Delta][ital S]=0 and [Delta][ital S]=1 in the response of [sup 12]C to 318 MeV protons

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.48.1106· OSTI ID:6276065

Baker, F T; Beatty, D; Bimbot, L; Cupps, V; Djalali, C; Fergerson, R W; Glashausser, C; Graw, G; Green, A; Jones, K; Morlet, M; Nanda, S K; Sethi, A; Storm, B H; Unkelbach, W; Willis, A ^[1]

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1. University of Georgia; Athens; Georgia 30602 (United States) Rutgers University; Piscataway; New Jersey 08854 (United States) Institut de Physique Nucleaire; F-91406 Orsay (France) University of South Carolina; Columbia; South Carolina 29208 (United States) Sektion Physik der Universitaet Muenchen; D-8046 Garching (Germany) Los Alamos National Laboratory; Los Alamos; New Mexico 87544 (United States) CEBAF; 12000 Jefferson Avenue; Newport News; Virginia 23606 (United States) University of Minnesota; Minneapolis; Minnesota 55455 (United States) KFA Juelich; D-5170 Juelich (Germany) Indiana University; Bloomington; Indiana 47405 (United States)

Angular distributions of the double-differential cross section [ital d][sup 2][sigma]/[ital d][Omega] [ital dE] ([sigma]) and the spin-flip probability [ital S][sub [ital n][ital n]] have been measured for inclusive inelastic proton scattering from [sup 12]C at [ital E][sub [ital p]]=318 MeV. Data have been obtained over an excitation energy range 9 MeV [le][ital E][sub [ital x]][le]42 MeV for laboratory scattering angles of 3[degree], 5[degree], 7[degree], 9[degree], 12[degree], 15[degree], and 18[degree]. Multipole decompositions of angular distributions of both the spin-flip cross section [sigma][sub SF]=[sigma][ital S][sub [ital n][ital n]] and the estimated cross section for [Delta][ital S]=0 transitions have been performed. The distribution of deduced [Delta][ital L]=1, [Delta][ital S]=0 (the giant-dipole resonance) strength peaks near [ital E][sub [ital x]]=22 MeV; although there is apparently much more strength relative to the energy-weighted sum rule (EWSR) than expected, this appears to be an artifact of instrumental background at small angles. Approximately 55% of the EWSR for [Delta][ital L]=2, [Delta][ital S]=0 was observed spread uniformly across the spectrum with no evidence for a giant-quadrupole resonance. Angular distributions for [sigma][sub SF] were analyzed using the predictions from random-phase approximation calculations for the nuclear structure and distorted-wave impulse approximation calculations for the scattering. These predictions are found to provide a good description of the [sigma][sub SF] data above [ital E][sub [ital x]]=25 MeV; values of [ital S][sub [ital n][ital n]] are predicted somewhat too low in this region.

• OSTI ID: 6276065
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 48:3; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
663520 -- Nuclear Mass Ranges-- A=6-19-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYON REACTIONS
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISTORTED WAVE THEORY
DISTRIBUTION
ENERGY RANGE
GIANT RESONANCE
HADRON REACTIONS
IMPULSE APPROXIMATION
INCLUSIVE INTERACTIONS
INELASTIC SCATTERING
INTERACTIONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEON REACTIONS
PARTICLE INTERACTIONS
PROTON REACTIONS
RANDOM PHASE APPROXIMATION
RESONANCE
SCATTERING
SPIN FLIP
TARGETS