%0 Journal Article
%T Beta and gamma decays of J(pi)=1(+), Al-24m state beta and gamma branching ratios
%A Nishimura, D.
%A Fujita, Y.
%A Fukuda, M.
%A Ganioglu, E.
%A Ichikawa, Y.
%A Kanazawa, M.
%A Kitagawa, A.
%A Mihara, M.
%A Momota, S.
%A Rubio, B.
%A Sato, S.
%A Susoy, G.
%A Torikoshi, M.
%A Matsuta, K.
%J European Physical Journal A
%D 2011
%V 47
%N 12
%I Springer
%@ 1434-6001
%G English
%F Nishimura_etal2011
%O WOS:000300285100010
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=905), last updated on Thu, 08 Mar 2012 10:11:39 +0000
%X A beta-gamma spectroscopy of the J(pi) = 1(+), 426 keV isomeric state of Al-24 ( Al-24m) has been carried out by using a Al-24 secondary beam with high purity and high isomeric ratio. From the absolute gamma-ray and beta-particle intensities observed in the decay of the isomeric state, the branching ratio R-B of the isomeric gamma-decay from Al-24m to the J(pi) = 4(+), ground state of Al-24 have been derived. The obtained R-B value of 69.6(7)% is much smaller than the previously accepted value of 82.5(30)%. The precise half-life for the isomer decay, T-1/2(m) = 130.9(13) ms, has been also determined in this experiment. Accordingly, the M3 gamma-decay strength B(M3) of the Al-24m decay becomes smaller and the total beta-decay branching ratio becomes larger. In particular, the beta-decay branching ratio to the ground state of Mg-24 becomes 24.3(9)%, which is 2.4 times larger than the previous value of 10.1(28)%. By combining the branching ratio and the half-life, the Gamow-Teller (GT) transition strength B(GT) of 0.0194(7) is deduced for the GT transition from Al-24m to the J(pi) = 0(+), ground state of Mg-24. This value is in good agreement with the values derived from charge-exchange reactions.
%R 10.1140/epja/i2011-11155-7
%U https://doi.org/10.1140/epja/i2011-11155-7
%P 155-7pp