β decay and β -delayed neutron decay of the N=82 nucleus In8249131
/ Authors
R. Dunlop, C. Svensson, C. Andreoiu, G. Ball, N. Bernier, H. Bidaman, V. Bildstein, M. Bowry, D. Cross, I. Dillmann
and 19 more authors
M. Dunlop, F. Garcia, A. Garnsworthy, P. Garrett, G. Hackman, J. Henderson, J. Measures, D. Mucher, B. Olaizola, K. Ortner, J. Park, C. Petrache, J. Pore, J. Smith, D. Southall, M. Ticu, J. Turko, K. Whitmore, T. Zidar
/ Abstract
The half-lives of three β-decaying states of 13149In82 have been measured with the GRIFFIN γ-ray spectrometer at the TRIUMF-ISAC facility to be T1/2(1/2−)=328(15)ms, T1/2(9/2+)=265(8)ms, and T1/2(21/2+)=323(55)ms, respectively. The first observation of γ rays following the βn decay of 131In into 130Sn is reported. The β-delayed neutron emission probability is determined to be P1n=12(7)% for the 21/2+ state and 2.3(3)% from the combined 1/2− and 9/2+ states of 13149In82 observed in this experiment. A significant expansion of the decay scheme of 131In, including 17 new excited states and 35 new γ-ray transitions in 13150Sn81 is also reported. This leads to large changes in the deduced β-branching ratios to some of the low-lying states of 131Sn compared to previous work with implications for the strength of the first-forbidden β transitions in the vicinity of doubly magic 13250Sn82. (Less)
Journal: Physical Review C