Abstract
The level structure of theN=80,140Nd has been investigated through the beta decay of140mPm and140gPm, 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) for140mPm and140gPm 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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The authors wish to thank the Atomic Energy Control Board of Canada for financial support of the work, and one of us (G.G.K.) would like to thank the National Research Council of Canada for scholarships awarded during the course of this work.
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Kennedy, G.G., Gujrathi, S.C. & Mark, S.K. States inN=80140Nd populated in the decay of140Pm. Z Physik A 274, 233–239 (1975). https://doi.org/10.1007/BF01437735
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DOI: https://doi.org/10.1007/BF01437735