Eur. Phys. J. A (2004) 21: 419-435
https://doi.org/10.1140/epja/i2003-10218-8

Beta-decay properties of ²⁵ Si and ²⁶ P

¹ Centre d’Etudes Nucléaires de Bordeaux-Gradignan, Allée du Haut-Vigneau, B.P. 120, 33170, Gradignan Cedex, France
² Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, 3001, Leuven, Belgium
³ LPC Caen, 6 Boulevard du Maréchal Juin, 14050, Caen Cedex, France
⁴ Department of Physics, University of Jyväskylä, PB 35 (YFL), 40014, Finland
⁵ Institut de Physique Nucléaire de Lyon, 69622, Villerbanne Cedex, France
⁶ Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA, Groningen, The Netherlands
⁷ Department of Physics and Astronomy, University of Edinburgh, EH9 3JZ, Edinburgh, UK
⁸ Grand Accélérateur National d’Ions Lourds, B.P. 5027, 14076, Caen Cedex 5, France
⁹ Institut de Recherche Subatomique, 23 rue du Loess, B.P. 28, 67037, Strasbourg Cedex, France
¹⁰ Lawrence Berkeley National Laboratory, 1 Cyclotron Road, CA 94720, Berkeley, USA
¹¹ Institut de Physique Nucléaire d’Orsay, 15 rue G. Clémenceau, 91406, Orsay Cedex, France

^* e-mail: blank@cenbg.in2p3.fr

Abstract

The -decay properties of the neutron-deficient nuclei ²⁵Si and ²⁶P have been investigated at the GANIL/LISE3 facility by means of charged-particle and -ray spectroscopy. The decay schemes obtained and the Gamow-Teller strength distributions are compared to shell-model calculations based on the USD interaction. B(GT) values derived from the absolute measurement of the -decay branching ratios give rise to a quenching factor of the Gamow-Teller strength of 0.6. A precise half-life of ms was determined for ²⁶P, the -(2)p decay mode of which is described.