High-spin states in the single-closed-shell nucleus 142Nd |
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Authors: | L-E De Geer A Kerek Z Haratym J Kownacki J Ludziejewski |
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Institution: | Research Institute for Physics, 104 05 Stockholm 50, Sweden;Institute of Nuclear Research, Dept. Phys. IA, 05-400 Swierk, Poland |
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Abstract: | The excited states of 14260Nd82 have been studied using the 140Ce(α, 2nγ)142Nd and 142Ce(α, 4γ)142Nd reactions. Singles γ-ray, γ-γ coincidence spectra and angular distributions of γ-rays with respect to the beam direction have been measured. Excited states up to 6.7 MeV with spin values up to 14 are populated. The energy spacings between the lower excited states with spin values up to 8 are similar to those found in the lighter N = 82, even-Z isotones. The majority of the observed states with spin values up to 10 can be explained as two-quasiparticle states. Several of the highest-spin states can be explained qualitatively as fourquasiparticle states. Strong population of the highest excited states (at about 5.7 MeV) is noted, like in other N = 82 isotones. The observed levels in 142Nd are compared with the shell model predictions using a simple δ-force interaction between two nucleons. |
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Keywords: | Nuclear reactions |
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