β decay of 97Ag: Evidence for the Gamow-Teller resonance near 100Sn

Z. Hu, L. Batist, J. Agramunt, A. Algora, B. A. Brown, D. Cano-Ott, R. Collatz, A. Gadea, M. Gierlik, M. Górska, H. Grawe, M. Hellström, Z. Janas, M. Karny, R. Kirchner, F. Moroz, A. Płochocki, M. Rejmund, E. Roeckl, B. RubioM. Shibata, J. Szerypo, J. L. Tain, V. Wittmann

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Abstract

In two complementary measurements, a cubelike array of 6 Euroball-Cluster germanium detectors and a total-absorption γ-spectrometer were used to investigate the β decay of 97Ag, a three proton-hole nucleus with respect to the 100Sn core. The half-life and QEC value of the decay of the 9/2+ ground state of 97Ag were determined to be 25.9(4) s and 6.98(11) MeV, respectively. A total of 603 γ rays (578 new) was observed, and 151 levels (132 new) in 97Pd have been identified. An interesting β-delayed γ cascade was observed, which comprises 6 γ-transitions with a deexcitation pattern involving an initial increase of the level spin. The Gamow-Teller (GT) β-decay strength distributions from the two measurements reveal a large GT resonance around 4 MeV with a width of about 1.8 MeV. The hindrance factor for the total GT strength, summed from the ground state up to 6 MeV excitation energy in 97Pd, amounts to 4.3(6) with reference to a shell-model prediction. This factor is discussed in comparison with a core polarization and a Monte Carlo shell-model calculation.

Original languageEnglish
Article number024315
Pages (from-to)243151-2431517
Number of pages2188367
JournalPhysical Review C - Nuclear Physics
Volume60
Issue number2
Publication statusPublished - Aug 1999

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Hu, Z., Batist, L., Agramunt, J., Algora, A., Brown, B. A., Cano-Ott, D., Collatz, R., Gadea, A., Gierlik, M., Górska, M., Grawe, H., Hellström, M., Janas, Z., Karny, M., Kirchner, R., Moroz, F., Płochocki, A., Rejmund, M., Roeckl, E., ... Wittmann, V. (1999). β decay of 97Ag: Evidence for the Gamow-Teller resonance near 100Sn. Physical Review C - Nuclear Physics, 60(2), 243151-2431517. [024315].