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Opening of the Z=40 subshell gap and the double-beta decay of 100Mo

✍ Scribed by Jouni Suhonen

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
402 KB
Volume
700
Category
Article
ISSN
0375-9474

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✦ Synopsis

Experimental and theoretical study of the Ξ² -decay of 100 Nb to the two-quasiparticle states in 100 Mo suggests the opening of the Z = 40 subshell gap in the proton pf-0g 9/2 shell for isobars near 100 Mo. Assuming the opening of the Z = 40 subshell gap both for 100 Mo and 100 Ru enables the study of the effects of this subshell gap upon the two-neutrino and neutrinoless double-beta-decay rates of 100 Mo to the ground state and excited states in 100 Ru. It is found that the influence of the opening of the Z = 40 gap has very minor effects on the beta-decay and double-beta-decay feeding of the 0 + and 2 + states of 100 Ru.

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The NEMO-2 tracking detector located in the FrΓ©jus Underground Laboratory was designed as a prototype for the NEMO-3 detector and to study different modes of double beta decay. Measurements with 100 Mo, 116 Cd, 82 Se and 96 Zr were carried out. Presented here are the experimental half-life limits on