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Gamow-Teller and M-1 strength in the S-32 (p, n) Cl-32 reaction at 135 MeV

  • Anderson, B.D.
  • Chittrakarn, T.
  • Baldwin, A.R.
  • Lebo, C.
  • Madey, R.
  • Tandy, Peter Charles
  • Watson, J.W.
  • Foster, C.C.
  • Brown, B.Alex
  • Wildenthal, B.H.
Publication Date
Dec 01, 1987
DOI: 10.1103/PhysRevC.36.2195
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The S32(p,n)32Cl 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+ states with characteristic ΔL=0 angular distributions peaked at 0°. The 1+ 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+ 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+ (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 S32. 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.

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