Absolute cross sections have been measured for (p, y) reactions on 63CU, 64Ni and 63CU over proton energy ranges of 1,05-3 '25, 1·00-3 ·45 and 1·05-4· 70 MeV respectively, for (p, n) reactions over proton energy ranges from threshold to 3· 25,3' 80 and 4·86 MeV respectively, and for 63CU(p, p') 63 CU over a proton energy range of 1·05-4'00 MeV. All the data are compared with global statistical model calculations. The agreement, to within a factor of 2, between theory and experiment is regarded as satisfactory for a global code, but the 64Ni data are suggestive of a closed shell effect at Z = 28.
In the analysis of the 64Ni(p, y) 65 CU cross-section data (Fig. 2, p. 467), insufficient weight was placed on the influence of resonance to ground state transitions. When these transitions are properly taken into account, the measured cross section is increased by amounts varying from 5 % to 30 % for individual points. A plot of the revised data, together with the predictions of the statistical model code HAUSER*4 is now presented. The agreement between theory and experiment is considerably improved, and the sentence commencing on p. 470, paragraph 2, line 6, should be amended to read 'Over most of the energy range below the neutron threshold it is ~20% high, .. .'. 64Ni(p. r ~,.
Cross sections for inelastic scattering of protons by 45SC have been measured over the energy range Ep = 1?2-2? 5 MeV for protons leading to the second, third, fourth, sixth and eighth excited states of 45SC. Statistical model calculations are' in good agreement with the data. Further statistical model cross section calculations are used in an investigation of the part played by inelastic and superelastic scattering of protons in bringing about a thermal distribution of states in 45SCin a stellar interior under the conditions of explosive silicon burning. This mechanism is found to be effective for temperatures above 4? ?x 109 K
Measurements of the 39K(p, ytOCa reaction in the region near 12 MeV show that none of the four resonances observed between 12·03 and 12·09 MeV excitation energy in 40Ca has In = 0+. If one of these states corresponds to the fj.f = 0 transition seen in the high energy (p, p') reaction at an excitation energy of 12·06±0·02 MeV, this suggests that the spin and parity of this state are 1 +.
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