Scattering of polarized protons from sup 7 Li at 200 MeV

Journal Article · Mon Apr 01 00:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.1664· OSTI ID:5771590

Glover, C W ^[1]; Foster, C C; Schwandt, P ^[2]; Comfort, J R ^[3]; Rapaport, J; Taddeucci, T N; Wang, D ^[4]; Wagner, G J ^[5]; Seubert, J ^[6]; Carpenter, A W; Carr, J A; Petrovich, F; Philpott, R J; Threapleton, M J ^[7]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (US) Indiana University Cyclotron Facility, Bloomington, Indiana 47405 (US)
2. Indiana University Cyclotron Facility, Bloomington, Indiana 47405 (US)
3. Physics Department, Arizona State University, Tempe, Arizona 85287 (US)
4. Physics Department, Ohio University, Athens, Ohio 45701 (US)
5. Physikalisches Institut der Universitaet Tuebingen, 7400 Tuebingen, Germany (DE)
6. Physics Department, Indiana University Purdue University at Indianapolis, Indianpolis, Indiana 46223 (DE)
7. Physics Department and Supercomputer Computations Research Institute, The Florida State University, Tallahassee, Florida 32306 (US)

New cross-section and analyzing-power data are presented for elastic and inelastic scattering of 200-MeV protons from {sup 7}Li, which has a 3/2{sup {minus}}, {ital T}=1/2 ground state. A microscopic folding-model optical potential, obtained by convoluting a Pauli-corrected effective nucleon-nucleon ({ital NN}) interaction with {sup 7}Li ground-state densities constrained by weak and electromagnetic data, produces a satisfactory description of the elastic data. The effects of the nonspherical terms in the optical potential, estimated via the distorted-wave approximation (DWA), are appreciable. The inelastic transitions leading to the 1/2{sup {minus}},{ital T}=1/2 and 7/2{sup {minus}},{ital T}=1/2 states at 0.48 and 4.63 MeV, respectively, are also examined within the framework of the microscopic folding model and the DWA. Transition potentials are generated by convoluting the effective {ital NN} interaction considered with target transition densities constrained by weak, electromagnetic, and low-energy proton and neutron scattering data. These potentials are employed in DWA calculations along with the folded optical potential that is consistent with the transition potentials. These self-consistent calculations also provide a good description of the inelastic data. The results provide a clear indication that there are important shape differences between the {sup 6}Li and {sup 7}Li radial densities and that the two inelastic transitions in {sup 7}Li, which are primarily quadrupole in character, have {rho}{sub 2{ital n}}{sup {ital m}}/{rho}{sub 2{ital p}}{sup {ital m}}{approx}0.9 and 0.9--1.2, respectively.

• OSTI ID: 5771590
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Vol. 43:4; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
LITHIUM 7 TARGET
PROTON REACTIONS
ELASTIC SCATTERING
INELASTIC SCATTERING
ANALYZING POWER
DIFFERENTIAL CROSS SECTIONS
DISTORTED WAVE THEORY
MEV RANGE 100-1000
NUCLEON-NUCLEON POTENTIAL
OPTICAL MODELS
POLARIZED BEAMS
BARYON REACTIONS
BEAMS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ENERGY RANGE
HADRON REACTIONS
MEV RANGE
NUCLEAR REACTIONS
NUCLEON REACTIONS
POTENTIALS
SCATTERING
TARGETS
651320* - Nuclear Properties & Reactions
A=6-19
Experimental