PT Journal
AU Phong, VHea
   Agramunt, J
   Algora, A
   Domingo-Pardo, C
   Morales, AI
   Tain, JL
   Tarifeño-Saldivia, A
   Tolosa-Delgado, A
TI Observation of a μs isomer in In-134(49)85: Proton-neutron coupling "southeast" of Sn-132(50)82
SO Physical Review C
JI Phys. Rev. C
PY 2019
BP 011302
EP 6pp
VL 100
IS 1
DI 10.1103/PhysRevC.100.011302
LA English
AB We report on the observation of a microsecond isomeric state in the single-proton-hole, three-neutron-particle nucleus In-134. The nuclei of interest were produced by in-flight fission of a U-238 beam at the Radioactive Isotope Beam Factory at RIKEN. The isomer depopulates through a gamma ray of energy 56.7(1) keV and with a half-life of T-1/2 = 3.5(4) μs. Based on the comparison with shell-model calculations, we interpret the isomer as the I-pi = 5(-) member of the pi 0g(9/2)(-1) circle times nu 1f(7/2)(3) multiplet, decaying to the I-pi = 7(-) ground state with a reduced-transition probability of B(E2; 5(-) -> 7(-)) = 0.53(6) W.u. Observation of this isomer, and lack of evidence in the current work for a I-pi = 5(-) isomer decay in In-132, provides a benchmark of the proton-neutron interaction in the region of the nuclear chart "southeast" of Sn-132, where experimental information on excited states is sparse.
ER