Two-neutrino double- β decay of Nd 150 to excited final states in Sm 150


Journal Article

© 2014 American Physical Society. Conclusions: Our half-life measurement agrees within uncertainties with another recent measurement in which no coincidence was employed. Our nuclear matrix element calculation may have an impact on a recent neutrinoless double-β decay nuclear matrix element calculation which implies that the decay to the first excited state in Sm150 is favored over that to the ground state.Background: Double-β decay is a rare nuclear process in which two neutrons in the nucleus are converted to two protons with the emission of two electrons and two electron antineutrinos.Purpose: We measured the half-life of the two-neutrino double-β decay of Nd150 to excited final states of Sm150 by detecting the deexcitation γ rays of the daughter nucleus.Method: This study yields the first detection of the coincidence γ rays from the 01+ excited state of Sm150. These γ rays have energies of 333.97 and 406.52 keV and are emitted in coincidence through a 01+→21+→0gs+ transition.Results: The enriched Nd2O3 sample consisted of 40.13 g Nd150 and was observed for 642.8 days at the Kimballton Underground Research Facility, producing 21.6 net events in the region of interest. This count rate gives a half-life of T1/2=[1.07-0.25+0.45(stat)±0.07(syst)]×1020 yr. The effective nuclear matrix element was found to be 0.0465-0.0054+0.0098. Finally, lower limits were obtained for decays to higher excited final states.

Full Text

Duke Authors

Cited Authors

  • Kidd, MF; Esterline, JH; Finch, SW; Tornow, W

Published Date

  • November 19, 2014

Published In

Volume / Issue

  • 90 / 5

Electronic International Standard Serial Number (EISSN)

  • 1089-490X

International Standard Serial Number (ISSN)

  • 0556-2813

Digital Object Identifier (DOI)

  • 10.1103/PhysRevC.90.055501

Citation Source

  • Scopus