TY  - JOUR
AU  - Hafner, G. et al
AU  - Algora, A.
PY  - 2021
DA  - 2021//
TI  - First lifetime investigations of N > 82 iodine isotopes: The quest for collectivity
T2  - Phys. Rev. C
JO  - Physical Review C
SP  - 014316
EP  - 18pp
VL  - 104
IS  - 1
PB  - Amer Physical Soc
AB  - We report on spectroscopic information and lifetime measurements in the neutron-rich I-135,I-137,I-139 isotopes. This is the first lifetime data on iodine isotopes beyond N = 82. Excited states were populated in fast neutron-induced fission of U-238 at the ALTO facility of IJCLab with the LICORNE neutron source and detected using the hybrid nu-ball spectrometer. The level schemes of the I-135,I-137,I-139 isotopes are revised in terms of excited states with up to maximum spin-parity of (33/2(+)), populated for the first time in fast neutron-induced fission. We provide first results on the lifetimes of the (9/2(1)(+)) and (13/2(1)(+)) states in I-137 and I-139, and the (17/2(1)(+)) state in 137I. In addition, we give upper lifetime limits for the (11/2(1)(+)) states in I135-139, the (15/2(1)(+)) state in I-137, the (17/2(1)(+)) state in I-139, and reexamine the (29/2(1)(+)) state in I-137. The isomeric data in I-13(5) are reinvestigated, such as the previously known (15/2(1)(+)) and (23/21) isomers with T-1/2 of 1.64(14) and 4.6(7) ns, respectively, as obtained in this work. The new spectroscopic information is compared to that from spontaneous or thermal-neutron induced fission and discussed in the context of large scale shell-model (LSSM) calculations for the region beyond Sn-132, indicating the behavior of collectivity for the three valence-proton iodine chain with N = 82, 84, 86.
SN  - 2469-9985
UR  - https://doi.org/10.1103/PhysRevC.104.014316
DO  - 10.1103/PhysRevC.104.014316
LA  - English
N1  - WOS:000674546900001
ID  - Hafner+Algora2021
ER  -