Phys.Rev. C 106, 044317 (2022)

S.Waniganeththi, D.E.M.Hoff, A.M.Rogers, C.J.Lister, P.C.Bender, K.Brandenburg, K.Childers, J.A.Clark, A.C.Dombos, E.R.Doucet, S.Jin, R.Lewis, S.N.Liddick, Z.Meisel, C.Morse, H.Schatz, K.Schmidt, D.Soltesz, S.K.Subedi

Establishing the ground-state spin of ⁷¹Kr

RADIOACTIVITY ⁷¹Kr(EC), (β⁺), (β⁺p) [from ⁹Be(⁹²Mo, X), E=140 MeV/nucleon, followed by separation of fragments using A1900 fragment separator and a Radio Frequency Fragment Separator (RFFS) at the NSCL-MSU facility]; measured particle identification plot of implanted ions, Eγ, Iγ, E(p), I(p), (implants)β-coin, (implants)(β-delayed protons)-coin, (implants)γγ-coin, (implants)βγ-coin, T_1/2 of decay of ⁷¹Kr; deduced absolute number of βγ-coin events, β events, absolute γ intensities, and intensities of β-delayed protons, logft for ground-state to ground-state superallowed β transition using SeGA array with 16 HPGe detectors for γ detection, and double-sided silicon-strip detector (DSSSDs) for particle detection. ⁷¹Kr; deduced Jπ and T_1/2 of the ground state, decay branching ratios. ⁷⁰Br; deduced T_1/2 of the 0+ g.s. and 9+ isomer. ⁷¹Br, ⁷⁰Se; deduced levels, J, π, β feedings, logft, I(p) feedings. Discussed structure of ⁷¹Kr and ⁷¹Br mirror nuclei. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.106.044317