High-spin level scheme of doubly odd128I

Abstract

High-spin states in the odd-odd 128 I have been studied experimentally using the 124 Sn( 7 Li, 3nγ ) 128 I reaction at beam energies of 28 and 32 MeV. A level scheme built on the known T 1/2 = 175 ns, (6 − ) isomer has been established. The low-lying states in the level scheme have been proposed to be associated with the πd 5/2 ⊗ νh 11/2 and πg 7/2 ⊗ νh 11/2 two-quasiparticle excitations. The strongly populated negative-parity states, forming a bandlike structure, have been assigned to be based on the πg 7/2 ⊗ νh 11/2 configuration. The πh 11/2 ⊗ νh 11/2 multiplet 9 + , 10 + , and 11 + members have been identified according to the systematics of the corresponding level structures observed in the lighter odd-odd iodine isotopes. The two-quasiparticle configuration assignments are supported by the nucleon pair approximation and empirical shell-model calculations.

High-spin states above the isomers in neutron-rich iodine nuclei near N=82

“…The Iodine (Z = 53) isotopes with three protons outside Z = 50 and a few neutron holes/particles in vicinity of the N = 82 have attracted attention of several recent studies. The importance of several structures based on πg 7/2 , πd 5/2 and νh 11/2 orbitals has been reported systematically in odd-odd Iodine isotopes till N = 75 [11][12][13][14]. In odd-A Iodine isotopes 127,129 I, collective bands based on πg 7/2 , πd 5/2 and πh 11/2 configurations have been reported.…”

Towards the drip lines of the nuclide landscape

“…Various possible shapes in 188 Au were discussed [40]. Many other experiments for the γ spectroscopy of nuclei in different mass regions gave new experimental results which lead to new insights into the structures of nuclei investigated [42][43][44][45][46][47][48][49][50][51][52].…”