Double {beta} decay of {sup 100}Mo to excited final states
- The Department of Physics, Duke University and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308 (United States)
A systematic study of the inclusive (0{nu}+2{nu}) double beta ({beta}{beta}) decay of {sup 100}Mo to various excited final states of {sup 100}Ru was performed. Utilizing two large HPGe detectors operated in coincidence, a search for the subsequent deexcitation {gamma}{gamma} cascades was conducted. A 1.05-kg sample of isotopically enriched (98.4%){sup 100}Mo was investigated for 455 days, yielding an unambiguous observation of the {beta}{beta} decay of {sup 100}Mo to the 0{sub 1}{sup +} state (1130.3 keV) of {sup 100}Ru. This excited final state decays via the 0{sub 1}{sup +}{yields}2{sub 1}{sup +}{yields}0{sub gs}{sup +} sequence (with E{sub {gamma}}{sub 1}=590.8 keV and E{sub {gamma}}{sub 2}=539.5 keV), and 22 such coincidence events were detected, with a continuous background estimated to be 2.5 events. This counting rate corresponds to a decay half-life for the {beta}{beta}(0{sup +}{yields}0{sub 1}{sup +}) transition of T{sub 1/2}{sup (0{nu}{sup +2{nu}})}=6.0{sub -1.1}{sup +1.9}(stat){+-}0.6(syst)x10{sup 20} years. Lower limits on decay half-lives were achieved for higher excited final states.
- OSTI ID:
- 20863857
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 74, Issue 4; Other Information: DOI: 10.1103/PhysRevC.74.044314; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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