Limits for Lepton-Conserving and Lepton-Nonconserving Double Beta Decay inCa48

Abstract

quadrupole angular distributions although we are not in disagreement with the 1=4 contributions, predicted by the shell model. 24 In addition, the sum of their differential cross sections equals that of the first 2+ in Cr 52 . As seen in Table III their B(E2)[ values are not equal to the Cr 52 state.It is interesting to note that the sum rule predicted by the weak-coupling model 25 holds even though the 24 H. O. Fimston, N. R. Robertson, and E. Rost, Phys. Rev. 134, B117 (1964). 25 A. de-Shalit, Phys. Rev. 122, 1530 (1961.

Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay ofCa48with the NEMO-3 detector

“…Searches for the 0νββ decay of 48 Ca began 60 years ago [25]. The main experimental technique that has been employed is the use of scintillating CaF 2 crystals [26][27][28]. Such detectors have good energy resolution and detection efficiency in order to search for a line at Q ββ , while backgrounds generally prevent a straightforward measurement of the 2νββ rate.…”

Development of Crystal Scintillators From Enriched Isotopes for Double $\beta$ Decay Experiments

“…It is worth to mention a pioneering work of der Mateosian and Goldhaber to search for neutrinoless decay of by using enriched and depleted in ( and ) crystal scintillators [25]. Several high sensitivity studies of processes were realized using crystal scintillators, which contain candidate nuclei (see Table I).…”

High sensitivity GEM experiment on 2β decay of76Ge

“…1c Hence, we conclude that "active" source approach provides 4π geometry for the source, absence of self-absorption, and better energy resolution, which does not depend on the angular and energy distribution of the electrons emitted in 2β decay. These advantages of "active" detectors were understood a long ago and the first experiment of this type was performed in 1966 by using 48 CaF 2 scintillator to study 2β decay of 48 Ca [23]. In the next year semiconductor Ge(Li) crystal was applied in the quest for 2β decay of 76 Ge [24].…”