Gamow-Teller and M1 strength in the /sup 32/S(p,n)/sup 32/Cl reaction at 135 MeV

Journal Article · Tue Dec 01 00:00:00 EST 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.36.2195· OSTI ID:5773517

Anderson, B D; Chittrakarn, T; Baldwin, A R; Lebo, C; Madey, R; Tandy, P C; Watson, J W; Foster, C C; Brown, B A; Wildenthal, B H

The /sup 32/S(p,n)/sup 32/Cl reaction was studied at 135 MeV by the time-of-flight technique. The overall energy resolution obtained was about 270 keV. The forward-angle spectra are dominated by the excitation of 1/sup +/ states with characteristic ..delta..L = 0 angular distributions peaked at 0/sup 0/. The 1/sup +/ spectrum is described well by distorted-wave Born approximation calculations with full S-D shell-model wave functions and a normalization factor of 0.60. The strengths of the 1/sup +/ excitations are interpreted as being equivalent to Gamow-Teller strengths excited in beta decay. The (p,n) cross sections are converted to reduced transition probabilities, B(GT), by means of a ''universal'' relationship obtained from other nuclei where analog beta decay measurements are available. The general distribution and total strength so obtained are represented well by full S-D shell-model calculations with Gamow-Teller matrix elements adjusted to reproduce the strengths of Gamow-Teller beta decays of S-D shell nuclei. The 1/sup +/ (p,n) cross sections are interpreted also in terms of magnetic-dipole (M1) strength and compared with inelastic-electron scattering measurements of such strength in /sup 32/S. The strength observed in individual states is seen to vary considerably between the two reactions; these differences are ascribed to orbital-current contributions in the electron-scattering reaction not present in the (p,n) reaction. The (p,n)= measurements extend to higher excitation energies than the electron-scattering measurements.

• Research Organization: Department of Physics, Kent State University, Kent, Ohio 44242
• OSTI ID: 5773517
• Journal Information: Phys. Rev. C; (United States), Vol. 36:6
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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SULFUR 32 TARGET
ANGULAR DISTRIBUTION
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DWBA
GAMOW-TELLER RULES
L-S COUPLING
MEV RANGE 100-1000
NEUTRONS
SHELL MODELS
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BORN APPROXIMATION
CHARGED-PARTICLE REACTIONS
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HADRON REACTIONS
HADRONS
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ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
ODD-ODD NUCLEI
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651420* - Nuclear Properties & Reactions
A=20-38
Experimental