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Abstract : |
Cross sections for the reactions Mn-55(n,p), Fe-56(n,p), and Ni-58(n,p) have been measured at an incident energy of 198 MeV, with protons observed over a range of energies corresponding to excitations of up to about 35 MeV in the residual nuclei Cr-55, Mn-56, and Co-58, respectively. Measurements were carried out at center-of-mass angles between 1.6-degrees and 19.9-degrees. A multipole analysis of the results yielded the distribution of Gamow-Teller (GT) and spin-dipole strength for each target. The total GT strength below an excitation energy of 8.5 MeV was 1.7 units for Mn-55, 2.9 units for Fe-56, and 3.8 units for Ni-58. Shell model calculations of the GT strength distribution, carried out in a restricted vector space, show fair to good agreement with the data up to an excitation energy of 8.5 MeV, but overestimate the total strength by a factor of between 3 and 4., |
