1. Spectroscopic studies of neutron-deficient light nuclei: decay properties of 21Mg, 25Si and 26P.
- Author
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Thomas, J.-C., Achouri, L., Äystö, J., Béraud, R., Blank, B., Canchel, G., Czajkowski, S., Dendooven, P., Ensallem, A., Giovinazzo, J., Guillet, N., Honkanen, J., Jokinen, A., Laird, A., Lewitowicz, M., Longour, C., de Oliveira Santos, F., and Stanoiu, M.
- Subjects
SPECTRUM analysis ,NUCLEAR physics ,NEUTRONS ,PROTONS ,HALF-life (Nuclear physics) - Abstract
Neutron-deficient nuclei with Tz equals to -3/2 and -2 have been produced at the GANIL/LISE3 facility in fragmentation reactions of a 95 MeV/u 36Ar primary beam in a 12C target. For the first time, β-delayed proton and β-γ emission has been simultaneously observed in the decay of 21Mg, 25Si and 26P. The decay scheme of the latter is proposed and the Gamow-Teller strength distribution in its β decay is compared to shell-model calculations based on the USD interaction. The B(GT) values derived from the absolute measurement of the β-branching ratios are in agreement with the quenching factor of about 60% obtained for allowed Gamow-Teller transitions in this mass region. A precise half-life of 43.7 (6) ms was determined for 26P, the β-2p emission of which was studied. The expected contribution of spectroscopic studies of neutron-rich nuclei is discussed with respect to the mirror asymmetry phenomenon occuring in analogous β decays. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2003
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