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High-precision half-life measurement for the isospin T=1/2 mirror β+ decay of Na21

J. Grinyer, G. F. Grinyer, M. Babo, H. Bouzomita, P. Chauveau, P. Delahaye, M. Dubois, R. Frigot, P. Jardin, C. Leboucher, L. Maunoury, C. Seiffert, J. C. Thomas, and E. Traykov
Phys. Rev. C 91, 032501(R) – Published 24 March 2015

Abstract

The half-life of the isospin T=1/2 mirror β+ decay of Na21 was measured at the GANIL-SPIRAL radioactive ion beam facility to be T1/2=22.422 (10) s, a result that is more than a factor of 5 times more precise than the previous world average, with a resulting ft value that is now two times more precise. The precision of this new result implies that the half-life is no longer the dominant source of uncertainty in the Ft value used in the calculation of Vud from mirror decays to test the conserved vector current hypothesis of the standard model. The value of Vud deduced from mirror decays using the new half-life result is now in better agreement with the Vud derived from T=1 superallowed 0+ to 0+ transitions.

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  • Received 30 October 2014
  • Revised 4 February 2015

DOI:https://doi.org/10.1103/PhysRevC.91.032501

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Authors & Affiliations

J. Grinyer1,*, G. F. Grinyer1, M. Babo1, H. Bouzomita1, P. Chauveau1, P. Delahaye1, M. Dubois1, R. Frigot1, P. Jardin1, C. Leboucher1, L. Maunoury1, C. Seiffert2, J. C. Thomas1, and E. Traykov1

  • 1Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Bvd Henri Becquerel, 14076 Caen, France
  • 2ISOLDE, CERN, 1211 Geneva 23, Switzerland

  • *joanna.grinyer@ganil.fr

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Vol. 91, Iss. 3 — March 2015

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