Decay of the high-K isomeric state to a rotational band in 257Rf

作者：Rissanen, J.^*; Clark, R. M.; Gregorich, K. E.; Gates, J. M.; Campbell, C. M.; Crawford, H. L.; Cromaz, M.; Esker, N. E.; Fallon, P.; For**erg, U.; Gothe, O.; Lee, I. -Y.; Liu, H. L.; Machiavelli, A. O.; Mudder, P.; Nitsche, H.; Pang, G.; Rice, A.; Rudolph, D.; Stoyer, M. A.; Wiens, A.; Xu, F. R.

来源：Physical Review C, 2013, 88(4): 044313.

DOI：10.1103/PhysRevC.88.044313

• MULTI-QUASI-PARTICLE
• NUCLEAR
• GAMMA
• ELEMENTS

The (257)Rf isotope has been populated via the Pb-208(Ti-50, n) fusion-evaporation reaction and delayed gamma-ray and electron decay spectroscopy has been performed. The existence of a high-K isomeric state in (257)Rf has been confirmed. The isomeric state decays into a rotational band based on the 11/2(-)[725] excitation, which was observed up to spin of (23/2(-)). Three multipolarity-E1 gamma transitions depopulating the isomeric state have been observed, which fixes the spin for that state to (21/2(+)). This assignment agrees with theoretical predictions calculated with the microscopic-macroscopic approach, which suggest the isomeric state to be formed by coupling an unpaired 11/2(-)[725] quasineutron to the (1/2(-)[521] circle times 9/2(+)[624])(5)- two-quasiproton state. The same two-quasiproton excitation is possible for the lowest isomer in (256)Rf.

• 出版日期2013-10-11
• 单位北京大学; 西安交通大学