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13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics, Cologne : Allemagne (2008)
Measurement of the Gamow-Teller Branching Ratio in the $\beta$-Decay of ${21}$Na
N.L. Achouri1, J.C. Angélique1, G. Ban1, B. Bastin1, B. Blank2, S. Dean, P. G. Dendooven, J. Giovinazzo2, S. Grévy3, K. Jungmann, B. Laurent1, E. Liénard1, O. Naviliat-Cuncic1, N.A. Orr1, A. Rogachevskiy, M. Sohani, E. Traykov, H. Wilschut

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.
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
Interactions fondamentales
structure nucléaire
Physique/Physique Nucléaire Expérimentale
beta-decay – radioactive decay periods – nucleosynthesis