Nucleon pair approximation description of the low-lying structure of108,109Te and109I

Alpha decay as a probe for the structure of neutron-deficient nuclei

“…One example is the proton-unbound nucleus 109 I [129] for which the lowest collective band starting from 7/2 + 1 and the inner-band E2 transition properties are very similar to those of ground state band in 108 Te [93] and the 7/2 + 1 band in 109 Te [130], indicating that the odd proton in 109 I, which occupies the g 7/2 orbital, is weakly coupled to the 108 Te daughter nucleus like a spectator. This scheme is supported by shell-model and pair truncated shell model calculations [131]. The ground state of 109 Te is 98 keV lower than the 7/2 + 1 state, for which the spin-parity has been tentatively assigned as 5/2 + .…”

(h11/2)2alignments in neutron-richBa132with neg

“…It's noteworthy that the collective-pair truncation of the Shell Model has be proved to be an efficient approach for the (h 11/2 ) 2 -alignment description [15][16][17]. In such truncation, collective pairs with spin 0 and 2 are normally employed to represent the low-lying collectivity [18][19][20][21][22][23][24], which naturally provide ∆I = 2 band structures, as 5 − , 6 − , 7 − and 8 − bands of 132 Ba behave. Recently, negative-parity pairs were introduced into the pair truncation [25][26][27], which enables a shell-model description of negative-parity states in a heavy even-nucleon system, e.g., negative-parity states of 132 Ba discussed here.…”

“…1 Following previous pair-truncation calculations [18][19][20][21][22][23][24], collective pairs with I π = 0 + and 2 + are introduced.…”

Large-scale configuration interaction description of the structure of nuclei around100Sn and208Pb

“…We have also done pair-truncated shell-model calculations with collective pairs as building blocks in Refs. [13,16,23] for both the standard shell model and continuum shell model in the complex energy plane. One example is the proton-unbound nucleus 109 I [24] for which the level structure and E2 transition properties are very similar to those of 108 Te [17] and 109 Te [25], indicating that the odd proton in 109 I is weakly coupled to the 108 Te daughter nucleus like a spectator.…”