Measurement of the Gamow-Teller Branching Ratio in the $\beta$-Decay of ${21}$Na

N.L. Achouri (1) , J.C. Angélique (1) , G. Ban (1) , B. Bastin (1) , Bertram Blank (2) , S. Dean , P. G. Dendooven , J. Giovinazzo (2) , S. Grévy (3) , K. Jungmann , B. Laurent (1) , E. Liénard (1) , O. Naviliat-Cuncic (1) , N.A. Orr (1) , A. Rogachevskiy , M. Sohani , E. Traykov , H. Wilschut

1 LPCC - Laboratoire de physique corpusculaire de Caen
2 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
3 GANIL - Grand Accélérateur National d'Ions Lourds

The beta-decay branching ratio of the GT transition in 21Na to the first excited state in 21Ne has been measured. The value obtained of 4.93(20)% is in agreement with the most recent measurement and with the value adopted so far. This confirms that the branching ratio is not the source of discrepancy in a previous measurement of beta−v correlation coefficient which exhibited a 3sigma difference with respect to the Standard Model prediction.

Mots clés: beta-decay; radioactive decay periods; nucleosynthesis

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

N.L. Achouri, J.C. Angélique, G. Ban, B. Bastin, Bertram Blank, et al.. Measurement of the Gamow-Teller Branching Ratio in the $\beta$-Decay of ${21}$Na. 13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics, Aug 2008, Cologne, Germany. pp.362-366, ⟨10.1063/1.3087046⟩. ⟨in2p3-00368796⟩