Double beta decay of $^{48}$Ca

Details Double beta decay of $^{48}$Ca Double beta decay of $^{48}$Ca

1996-08-04

arxiv.org/abs/nucl-ex/9608001v1

Phys.Rev.Lett.77:5186-5189,1996

Physics

Nuclear Physics

Nuclear Experiment

4 pages, LaTex, 3 figures imbedded, PRL format

Scientific paper

10.1103/PhysRevLett.77.5186

$^{48}$Ca, the lightest double beta decay candidate, is the only one simple enough to be treated exactly in the nuclear shell model. Thus, the $\beta\beta(2\nu)$ half-life measurement, reported here, provides a unique test of the nuclear physics involved in the $\beta\beta$ matrix element calculation. Enriched $^{48}$Ca sources of two different thicknesses have been exposed in a time projection chamber, and yield T$_{1/2}^{2\nu} = (4.3^{+2.4}_{-1.1} [{\rm stat.}] \pm 1.4 [{\rm syst.}]) \times 10^{19}$ years, compatible with the shell model calculations.

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