States inN=80140Nd populated in the decay of140Pm |
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Authors: | G. G. Kennedy S. C. Gujrathi S. K. Mark |
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Affiliation: | 1. Foster Radiation Laboratory, McGill University, Montreal, Quebec, Canada
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Abstract: | The level structure of theN=80,140Nd has been investigated through the beta decay of140m Pm and140g Pm, whose decay half-lives were measured to be 5.95±0.05 min and 9.1±0.5 sec, respectively. Decay schemes for the two isomers have been constructed fromγ-ray measurements. With the help of the beta decayft values and internal conversion electron measurements, spins and parities were deduced for levels in140Nd. Among the levels a 7? state at 2222.0 keV and a 5? state at 2273.3 keV are identified as two-neutron quasiparticle states. The (ie233-01) for140m Pm and140g Pm have been deduced as 7? and 1+, respectively. From beta end-point measurements, the decay energies of the two isomers have been determined asQ EC=6.48±0.07 MeV140m (Pm) andQ EC=6.08±0.10 MeV (140gPm). The results are discussed in the light of nuclear systematics of theN=79 and 80 isotones. |
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