The (3He, t) reaction at 197 MeV on 12C, 24Mg, 28Si and 40Ca

doi:10.1016/0375-9474(84)90429-9

Nuclear Physics A

Volume 422, Issue 1, 18 June 1984, Pages 12-44

https://doi.org/10.1016/0375-9474(84)90429-9 Get rights and content

Abstract

Spectra have been measured for the (³He,t) reaction on ¹²C, ²⁴Mg, ²⁸Si and ⁴⁰Ca at E_lab = 197 MeV and θ_lab = 15°. The analog of the giant dipole resonance (GDR) is strongly populated in the charge-exchange reaction for each of the targets used in this study. Differences between the spectral shape of the GDR known in ¹²C, ²⁸Si, ²⁴Mg and ⁴⁰Ca from photonuclear work and their analogs in ¹²N, ²⁸P, ²⁴Al and ⁴⁰Sc are discussed. No evidence is seen for the population of a compact isovector giant quadrupole resonance (GQR) in any of these targets. Angular distributions have been measured at this energy for the ⁴⁰Ca(³He, ³He), ⁴⁰Ca(³He, ³He′)⁴⁰Ca and ⁴⁰Ca(³He, t)⁴⁰Sc reactions. The elastic ³He scattering from ⁴⁰Ca is reasonably described by a volume Woods-Saxon optical potential that is very similar to one known from lower-energy studies. Collective DWA calculations using this potential reproduce the inelastic scattering to the 3⁻ and isoscalar GQR states of ⁴⁰Ca and an additional calculation using the Goldhaber-Teller model roughly reproduces the measured charge-exchange angular distributions of the GDR in ⁴⁰Sc. Data for the inelastic-scattering and charge-exchange reactions to a few low-lying discrete states and the region including the GDR in mass 40 have also been examined in DWA calculations using a microscopic double-folding model with a realistic effective interaction and particle-hole wave functions. Where possible these results are compared with results for other probes and rough consistency is found. The decomposition of the strength observed in the GDR region via (³He, t) is considered in some detail and it is estimated that 30% of this strength is ΔS = 1.

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^†: Work supported in part by the National Science Foundation.

^∗: Permanent address: Kernfysisch Versneller Institute, 9747AA Groningen, The Netherlands.

^††: Work supported by the Division of Basic Energy Sciences, US Department of Energy. BNL is operated by the Associated Universities, Inc. under contract no. DE-AC02-76CH99916 and ORNL by the Union Carbide Corporation under contract no. W-7405-eng-26.

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