Spectroscopy and lifetime measurements in Te-134,Te-136,Te-138 isotopes and implications for the nuclear structure beyond N=82
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2021
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Amer Physical Soc
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Abstract
We report on spectroscopic information and lifetime measurements of even-even neutron-rich Te isotopes. 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.-ball spectrometer. We provide first results on lifetimes of the 6(1)(+) state in Te-136 and the (6(1)(+)), (4(1)(+)), and (2(1)(+)) states in Te-138 and discuss the results in the context of large-scale shell-model calculations. The level schemes of Te-136 and Te-138 are revised in terms of lifetimes of their 2(1)(+), 4(1)(+) states and updated information on the (4(2)(+)) state in Te-136 is presented. In addition, previously reported data on spectroscopy and lifetimes in Te-134 are reexamined. This work provides new insights into the evolution of collectivity for Te isotopes with N = 82, 84, 86.
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©2021 American Physical Society. Artículo firmado por 73 autores. The authors thank the operators of the ALTO facility for providing the reliable beams used during the experiment. Additionally, we thank the FASTER collaboration for the technical support given. GAMMA-POOL and LOANPOOL are acknowledged for loaning the Clover and Phase I HPGe detectors. The FATIMA collaboration is acknowledged for loaning the LaBr3(Ce) detectors. Some of the coauthors of this work were supported by the STFC UK Nuclear Data Network, the STFC (Grants No. ST/L005743/1 and No. ST/P005314), the Marion Redfearn Trust, BMBF (NUSTAR.DE Grants No. 05P15RDFN1 and No. 05P19PKFNA), and MINECO Grant No. FPA2015-65035-P. Part of the collaboration has received funding from the European Union's HORIZON 2020 Program under Grant No. 654002. Spanish MINECO was funding us via FPA2015-65035-P and RTI2018-098868-B-I00. G.H. and R.L. acknowledge support from the IDEX-API grant. P.H.R., S.M.C., M.B., and A.B. acknowledge support from the UK Government Department of BEIS via the National Measurement System, and the STFC consolidated grant. A.B., R.-B.G. and N.W. are supported by the DFG under Grant No. BL 1513/1-1. F.Z. received support from the Research Council of Norway under Contract No. 263030.