Dipole and spin-dipole resonances in charge-exchange reactions on [sup 12]C

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

DOI:https://doi.org/10.1103/PhysRevC.48.1158· OSTI ID:6024826

Yang, X; Wang, L; Rapaport, J ^[1]; Goodman, C D; Foster, C; Wang, Y; Unkelbach, W ^[2]; Sugarbaker, E; Marchlenski, D; de Lucia, S; Luther, B ^[3]; Ullmann, J L; Ling, A G; Park, B K; Sorenson, D S; Rybarcyk, L; Taddeucci, T N ^[4]; Howell, C R; Tornow, W ^[5]

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1. Ohio University, Athens, Ohio 45701 (United States)
2. Indiana University, Indiana University Cyclotron Facility, Bloomington, Indiana 47405 (United States)
3. Ohio State University, Columbus, Ohio 43210 (United States)
4. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
5. Department of Physics, Duke University and Triangle Universities Nuclear Laboatory, Durham, North Carolina 27706 (United States)

The [sup 12]C([ital n],[ital p])[sup 12]B reaction was studied using the white neutron source at the Los Alamos Meson Physics Facility/Weapon Neutron Research Center with a continuous incident neutron energy from 60 to 260 MeV. Double differential cross sections were measured in the angular range 11[degree][le][theta][sub lab][le]37[degree]. Using the neutron time-of-flight facility at the Indiana University Cyclotron Facility, we also studied the [sup 12]C([ital p],[ital n])[sup 12]N reaction at [ital E][sub [ital p]]=186 MeV and the [sup 12]C([ital [rvec p]],[ital [rvec n]])[sup 12]N reaction at [ital E][sub [ital [rvec p]]]=160 and 186 MeV. Double differential cross sections were measured between [theta][sub lab]=0[degree] and [theta][sub lab]=50[degree] in 5[degree] steps. Spin observables [ital D][sub [ital N][ital N]], [ital A][sub [ital Y]], and [ital P] were measured at [theta][sub lab]=5[degree],9[degree],13[degree] with [ital E][sub [ital [rvec p]]]=160 MeV and [theta][sub lab]=15[degree],20[degree] with [ital E][sub [ital [rvec p]]]=186 MeV. Angular distributions of differential cross section and spin observables for low-lying transitions in the residual nuclei are compared with disorted-wave impulse approximation (DWIA) calculations. A multipole decomposition analysis was performed to study the giant dipole and giant spin-dipole resonances. The contributions of the quasifree reaction in the giant resonance region was subtracted. The empirical results of energy distributions for dipole ([Delta][ital L]=1) transition are compared with DWIA calculations using nuclear structure information obtained with a conventional shell model and also with a random phase approximation.

• OSTI ID: 6024826
• 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
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BORON 12
BORON ISOTOPES
CARBON 12 TARGET
CHARGE-EXCHANGE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTORTED WAVE THEORY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRON REACTIONS
HADRONS
IMPULSE APPROXIMATION
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MILLISEC LIVING RADIOISOTOPES
NEUTRON REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
ODD-ODD NUCLEI
PROTONS
RADIOISOTOPES
RANDOM PHASE APPROXIMATION
RESONANCE
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
TARGETS