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J. Nurzynski T.R. Ophel P.D. Clark J.S. Eck D.F. Hebbard D.C. Weisser B.A. Robson R. Smith 《Nuclear Physics A》1981,363(1):253-268
Excitation functions for the reaction 24Mg(16O, 12C)28Si(g.s., 2+1) were measured at 5°(lab) in the energy range 32 < Ec.m. < 49 MeV. Although the resonant structure, previously observed at lower energies, becomes progressively weaker, three new correlated maxima have been observed near Ec.m. = 37.5, 40.2 and 43.5 MeV. Angular distribution measurements at these energies yield spin assignments, from P2j(cos θ) comparisons, of 27, 29 and 31, respectively. Attempts to find a consistent optical-model fit to the elastic scattering in the entrance channel and an exact finite-range DWBA fit to the four-nucleon transfer reaction in this energy range were unsuccessful. Such a failure is to be expected if strong couplings between the elastic channel and inelastic channels of either the initial or final system are important. The features of the resonance phenomena in the transfer reaction are discussed within a band crossing model framework. 相似文献
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A.F. Zeller G.T. Hickey D.C. Weisser D.F. Hebbard B.A. Robson 《Nuclear Physics A》1978,301(1):130-140
Reactions induced by 14N on 26Mg at bombarding energies of 60–95 MeV have been studied. Angular distributions for states populated in 29Si by the (14N, 11B) reaction and in 30Si by the (14N, 10B) reaction have been compared with Hauser-Feshbach and DWBA calculations to determine the reaction mechanism and to deduce spectroscopic information. The cross sections for the states populated in 29Si and 30Si are in poor agreement with statistical model calculations, indicating a non-compound nucleus mechanism. 相似文献
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K.W. Kemper A.F. Zeller T.R. Ophel D.F. Hebbard A. Johnston D.C. Weisser 《Nuclear Physics A》1979,320(2):413-421
Detailed angular distributions for the elastic and inelastic scattering of 7Li at E = 36, 42, and 48 MeV and of 6Li at E = 38, 44, and 50 MeV by 54Fe have been measured. It is not possible to describe both sets of data with the same set of optical-model parameters. The ratio of is 0.8 for 7Li and 1.4 for 6Li at the strong absorption radius, implying stronger absorption for 7Li than for 6Li. No energy dependence in the optical-model parameters was necessary for either 6Li or 7Li. The inelastic scattering from the 54Fe 2+, 1.41 MeV state was well described by the DWBA and the extracted deformation length (βR = 0.62) was the same for both 6Li and 7Li scattering. It was not possible to describe the 7Li projectile excitation data with collective-model DWBA calculations showing that more detailed calculations for the projectile excitation are necessary. 相似文献
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Angular distributions have been measured for transitions to low-lying states in 143Pm and 145Eu populated by the 142Nd(7Li, 6He)143 and the 144Sm(7Li, 6He)145Eu reactions at MeV. Elastic scattering of 7Li at 52 MeV on 142Nd and 144Sm, and 6Li at 46 MeV on 142Nd and at 45 MeV on 144Sm, were measured. Optical-model parameters extracted from fits to the scattering data were used in a finite-range DWBA analysis of the angular distributions for levels below 1.40 MeV excitation energy in 143Pm and 1.84 MeV in 145Eu. The reaction cross sections forward of 6° c.m. allow unambiguous distinction to be made between 2d and 2d final states. Final-state spins have been assigned to d-states in 143Pm at 1.40 MeV(+)and in 145Eu at 1.042 MeV (+). Existing assignments to other levels in both residual nuclei have been confirmed. 相似文献
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