Phys. Rev. Lett. 77, 5186–5189 (1996)Double Beta Decay of 48CaReceived 2 August 1996; published in the issue dated 23 December 1996 48Ca, the lightest experimentally accessible double beta decay candidate, is the only one simple enough to be treated exactly in the nuclear shell model. Thus the ββ2ν half-life measurement, reported here, provides a unique test of the nuclear physics involved in the ββ matrix element calculation. Enriched 48Ca sources of two different thicknesses have been exposed in a time projection chamber. We observe a half-life of T1/22ν = (4.3-1.1+2.4[stat]±1.4[syst])×1019 yr, consistent with shell model calculations. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.5186
DOI:
10.1103/PhysRevLett.77.5186
PACS:
23.40.Hc, 21.10.Tg, 21.60.Cs, 27.40.+z
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