Spin assignments from the 142Nd(7Li, 6He)143Pm and 144Sm(7Li, 6He)145Eu reactions at 52 MeV |
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Authors: | PD Clark TR Ophel J Nurzynski CH Atwood DF Hebbard |
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Institution: | Department of Nuclear Physics, Australian National University, Canberra, 2600, Australia |
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Abstract: | 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. |
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Keywords: | Nuclear reactions |
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