/sup 58/Ni(p, p') reaction at 60 MeV: Study of the analyzing power for inelastic excitation of the giant resonance region of the nuclear continuum and of low-lying bound states

Journal Article · Fri Oct 01 04:00:00 EDT 1976 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.14.1392· OSTI ID:7336908

Kocher, D C; Bertrand, F E; Gross, E E; Newman, E

The analyzing power of the giant resonance region of the nuclear continuum and of low-lying bound states for incident 60-MeV polarized protons has been investigated in the /sup 58/Ni(p, p') reaction. The measurements are compared with collective-model distorted-wave Born-approximation calculations employing a spin--orbit transition potential of the full-Thomas form and optical-model parameters which give a good description of the analyzing power for proton elastic scattering from /sup 58/Ni at 60 MeV. The predicted analyzing powers for the giant quadrupole (E2) resonance at E/sub x/ = 16.5 MeV and for low-lying bound states with J/sup ..pi../ = 2/sup +/, 3/sup -/, and 4/sup +/ are in qualitative agreement with the measurements for theta/sub lab/ = 15--60/sup 0/. However, a systematic discrepancy is observed for the quadrupole resonance, where the measurements for theta/sub lab/ = 15--30/sup 0/ are considerably more negative than the calculations. A similar but less pronounced effect is observed for the strongly excited 2/sup +/ and 3/sup -/ bound states. Improved fits to the analyzing power for the quadrupole resonance are obtained by reducing the spin--orbit diffuseness parameter or by including an attractive imaginary spin--orbit potential. Analysis of the cross section for a weaker resonance at E/sub x/ = 13.5 MeV indicates an E2 assignment. The analyzing power for the unstructured nuclear continuum above the giant resonance region is A/sub y/ approx. = - 0.05 +- 0.01 at most angles between 15 and 40/sup 0/. (AIP)

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• OSTI ID: 7336908
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 14:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651525* -- Nuclear Properties & Reactions
A=39-58
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
BARYON REACTIONS
BEAMS
BORN APPROXIMATION
BOUND STATE
CHARGED-PARTICLE REACTIONS
COLLECTIVE MODEL
CROSS SECTIONS
DWBA
ENERGY RANGE
GIANT RESONANCE
HADRON REACTIONS
INELASTIC SCATTERING
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MULTIPOLES
NICKEL 58 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
OPTICAL MODELS
POLARIZED BEAMS
PROTON REACTIONS
QUADRUPOLES
RESONANCE
SCATTERING
TARGETS