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.
|Number of pages||2188367|
|Journal||Physical Review C - Nuclear Physics|
|Publication status||Published - Aug 1999|
ASJC Scopus subject areas
- Nuclear and High Energy Physics