β decay and β-delayed neutron decay of the N = 82 nucleus ¹³¹₄₉In₈₂

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 T_1/2 (1/2^-) = 328 (15) ms, T_1/2(9/2⁺) = 265 (8) ms, and T_1/2 (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 P_1n = 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.