PT Journal
AU Zago, Lea
   Gadea, A
   Algora, A
TI High-spin states in Po-212 above the alpha-decaying (18(+)) isomer
SO Physics Letters B
JI Phys. Lett. B
PY 2022
BP 137457
EP 5pp
VL 834
DI 10.1016/j.physletb.2022.137457
LA English
DE gamma spectroscopy; Isomer spectroscopy; High-spin spectroscopy
AB The nucleus Po-212 has been produced through the fragmentation of a U-238 primary beam at 1GeV/nucleon at GSI, separated with the FRagment Separator, FRS, and studied via isomer gamma-decay spectroscopy with the RISING setup. Two delayed previously unknown gamma rays have been observed. One has been attributed to the E3 decay of a 21(-) isomeric state feeding the alpha-emitting 45-s (18(+)) high-spin isomer. The other gamma-ray line has been assigned to the decay of a higher-lying 23(+) metastable state. These are the first observations of high-spin states above the Po-212 (18(+)) isomer, by virtue of the selectivity obtained via ion-by-ion identification of U-238 fragmentation products. Comparison with shell-model calculations points to shortfalls in the nuclear interactions involving high- jproton and neutron orbitals, to which the region around Z similar to 100 is sensitive.
ER