Isomeric state at 945.3 keV in237Np |
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Authors: | M Steinmayer K E G Löbner L Corradi U Lenz P R Pascholati U Quade K Rudolph W K Schomburg S J Skorka |
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Institution: | 1. Sektion Physik, Universit?t München, Am Coulombwall 1, W-8046, Garching, Germany
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Abstract: | A new isomeric state in237Np has been discovered at an excitation energy of (945.3±0.2) keV withT 1/2 =(711±40) ns. Six gamma-ray lines have been measured depopulating the isomeric state to known levels in237Np. The comparison of the measured absolute gamma-ray transition probabilities with empirical values yields as most probable spinI andK assignmentI=K=13/2 for this isomeric state. It is most likely a 1-proton-2-neutron quasiparticle state 13/2?π5/2+ 642] +ν7/2? 743] + ν 1/2+ 631]. However, a one-quasiparticle 11/2? 505] configuration for the isomer cannot be excluded. |
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