beta decay of Ag-97: Evidence for the Gamow-Teller resonance near Sn-100 -art. no. 024315

Hu, Z Batist, L Agramunt, J Algora, A Brown, BA Cano-Ott, D Collatz, R Gadea, A Gierlik, M Gorska, M Grawe, H Hellstrom, M Janas, Z Karny, M Kirchner, R Moroz, F Plochocki, A Rejmund, M Roeckl, E Rubio, B Shibata, M Szerypo, J Tain, JL Wittmann, V

Z. Hu et al., beta decay of Ag-97: Evidence for the Gamow-Teller resonance near Sn-100 -art. no. 024315, PHYS REV C, 6002(2), 1999, pp. 4315

46

INGLESE

Article

Physics

PHYSICAL REVIEW C-NUCLEAR PHYSICS

0556-2813 → ACNP

6002

2

1999

ISI

0556-2813(199908)6002:2<4315:BDOAEF>2.0.ZU;2-0

In two complementary measurements, a cubelike array of 6 Euroball-Cluster g ermanium detectors and a total-absorption gamma-spectrometer were used to i nvestigate the beta decay of Ag-97, a three proton-hole nucleus with respec t to the Sn-100 core. The half-life and O-EC value of the decay of the 9/2( +) ground state of Ag-97 were determined to be 25.9(4) s and 6.98(11) MeV, respectively. A total of 603 gamma rays (578 new) was observed, and 151 lev els (132 new) in Pd-97 have been identified. An interesting beta-delayed ga mma cascade was observed, which comprises 6 gamma-transitions with a deexci tation pattern involving an initial increase of the level spin. The Gamow-T eller (GT) beta-decay strength distributions from the two measurements reve al a large GT resonance around 4 MeV with a width of about 1.8 MeV. The hin drance factor for the total GT strength, summed from the ground state up to 6 MeV excitation energy in Pd-97, amounts to 4.3(6) with reference to a sh ell-model prediction. This factor is discussed in comparison with a core po larization and a Monte Carlo shell-model calculation. [S0556-2813(99)05208- 5].