Double beta decay of^{48}Ca
Abstract
^{48}Ca, the lightest double beta decay candidate, has been until now the only one simple enough to be treated exactly in the nuclear shell model. Thus, the ββ(2 ν) halflife measurement, reported here, provides a unique test of the nuclear physics involved in the ββ 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 ν }}=(4.3{_{1.1}/^{+2.4}}[stat.] ± 1.4[syst.]) × 10^{19} years, compatible with the shell model calculations. The consequences of this result for the shell model calculation of the ββ(2 ν) rate are briefly discussed.
 Publication:

Czechoslovak Journal of Physics
 Pub Date:
 February 1998
 DOI:
 10.1023/A:1021203622422
 Bibcode:
 1998CzJPh..48..147B