beta decay of the 21/2+ isomer in Mo-93 and level structure of Nb-93

Hori, T.; Masue, T.; Odahara, A.; Kura, K.; Tajiri, K.; Shimoda, T.; Fukuchi, T.; Suzuki, T.; Wakabayashi, Y.; Gono, Y.

doi:10.1103/PhysRevC.80.034306

beta decay of the 21/2+ isomer in Mo-93 and level structure of Nb-93

T. Hori
(
- Japan Research Inst., Osaka
)
,
T. Masue
(
- Japan Research Inst., Osaka
)
,
A. Odahara
(
- Japan Research Inst., Osaka
)
,
K. Kura
(
- Japan Research Inst., Osaka
)
,
K. Tajiri
(
- Japan Research Inst., Osaka
)

Sep, 2009

5 pages

Published in:

Phys.Rev.C 80 (2009) 034306

DOI:

10.1103/PhysRevC.80.034306

View in:

Nuclear Science References

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Abstract: (APS)

The γ rays associated with β decay of the 21/2+ isomer in Mo93 (Ex=2.425 MeV, T1/2=6.85 h) were measured with a selective sensitivity to long-lived isomer decays. A new 1262-keV transition was found in the γ-γ coincidence measurement, and it was attributed to a transition in Nb93, which is the daughter nucleus of the β decay of the Mo93 isomer, from the 2.753- to the 1.491-MeV levels. Accurate γ-ray intensity balances have determined the β-decay intensity from the Mo93 isomer to the 2.753-MeV level in Nb93 and placed no appreciable intensity for the previously reported β-decay branching to the 2.180-MeV level, for which a recent in-beam γ-ray experiment assigned to be Iπ = 17/2−. Based on the γ-ray intensities from the 2.753-MeV level, spin-parity assignment of this level was revised from 21/2+ to 19/2+. The observed β-decay intensity and the spin-parity assignment were explained by the jj-coupling shell model calculations.