Neutron and proton transition densities from S-32, S-34 (p, p') at Ep=318 MeV. 1. Isoscalar densities for S-32

Journal Article · Fri Nov 01 04:00:00 EST 1991 · Phys. Rev. C

DOI:https://doi.org/10.1103/PhysRevC.44.1963· OSTI ID:918877

Kelly, J J; Khandaker, M A; Boberg, P; Feldman, A E; Flanders, B S; Hyman, S; Seifert, H; Karen, P; Norum, B E; Welch, P; Nanda, S; Saha, A

Differential cross sections and analyzing powers for low-lying states of 32S were measured using 318 MeV protons. The data were analyzed using an empirical effective interaction previously fitted to inelastic scattering data for 16O and 40Ca at the same energy. Transition densities for many states were fitted to the data using general expansions which permit evaluation of uncertainties due to statistical and normalization errors, penetrability and distortion, and incompleteness in momentum space. The accuracy of the procedure was tested by comparing isoscalar densities fitted to (p,p') data for 32S with proton densities fitted to (e,e') data. The good agreement between these analyses supports the quantitative accuracy of densities fitted to (p,p') data. Isoscalar densities were also fitted to data for several states of 32S for which no (e,e') data exist. We find that the experimental densities agree well with the shell model for the first 2+ state, but that the neutron density for the second 2+ state is distinctly different in shape. Good qualitative agreement between the data and the shell model is obtained for the first two 4+ states of 32S. Transition densities were also fitted to the data for the lowest 1-, 3-, and 5- states in 32S. The shape of the 1- transition density is complicated, but the very small matrix element agrees with the approximate selection rule that suppresses isoscalar E1 moments.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 918877
• Report Number(s): CEBAF-PR-91-60; DOE/ER/40150-4381
• Journal Information: Phys. Rev. C, Journal Name: Phys. Rev. C Vol. 44; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
DIFFERENTIAL CROSS SECTIONS
EVALUATION
INELASTIC SCATTERING
MATRIX ELEMENTS
NEUTRON DENSITY
NEUTRONS
PROTONS
SELECTION RULES
SHAPE
SHELL MODELS