Prompt-delayed γ-ray spectroscopy of neutron-rich 119.121In isotopes

Biswas, S.; Lemasson, A.; Rejmund, M.; Navin, A.; Kim, Y. H.; Michelagnoli, C.; Stefan, I.; Banik, R.; Bednarczyk, P.; Bhattacharya, Soumik; Bhattacharyya, S.; Clément, E.; Crawford, H. L.; de France, G.; Fallon, P.; Frémont, G.; Goupil, J.; Jacquot, B.; Li, H. J.; Ljungvall, J.; Maj, A.; Ménager, L.; Morel, V.; Palit, R.; Pérez-Vidal, R. M.; Ropert, J.

doi:10.1103/physrevc.102.014326

Title: Prompt-delayed γ-ray spectroscopy of neutron-rich ^119.121In isotopes

Journal Article · Wed Jul 29 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.102.014326· OSTI ID:1783105

Biswas, S. ^[1];

^[1]; Rejmund, M. ^[1]; Navin, A. ^[1]; Kim, Y. H. ^[2]; Michelagnoli, C. ^[2]; Stefan, I. ^[3]; Banik, R. ^[4]; Bednarczyk, P. ^[5]; Bhattacharya, Soumik ^[4]; Bhattacharyya, S. ^[4]; Clément, E. ^[1]; Crawford, H. L. ^[6]; de France, G. ^[1]; Fallon, P. ^[6]; Frémont, G. ^[1]; Goupil, J. ^[1]; Jacquot, B. ^[1]; Li, H. J. ^[1]; Ljungvall, J. ^[3] more »

Centre National de la Recherche Scientifique (CNRS), Caen (France). Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), Grand Accelerateur National d'Ions Lourds (GANIL)
Centre National de la Recherche Scientifique (CNRS), Caen (France). Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), Grand Accelerateur National d'Ions Lourds (GANIL); Inst. Laue-Langevin, Grenoble (France)
Univ. Paris-Saclay (France). IJCLab; Centre National de la Recherche Scientifique (CNRS), Paris (France). Inst. National de Physique Nucleaire et de Physique des Particules (IN2P3)
Variable Energy Cyclotron Centre, Kolkata (India); Homi Bhabha National Inst., Mumbai (India)
Inst. of Nuclear Physics (PAN), Krakow (Poland)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Tata Inst. of Fundamental Research, Mumbai (India)
Spanish National Research Council (CSIC) and Univ. of Valencia (Spain). Inst. de Fisica Corpuscular

The Z = 50 shell closure, near N = 82, is unique in the sense that it is the only shell closure with the spin-orbit partner orbitals, $π g_{9 / 2}$ and $π g_{7 / 2}$ , enclosing the magic gap. The interaction of the proton hole/particle in the above-mentioned orbitals with neutrons in the νh_11/2 orbital is an important prerequisite to the understanding of the nuclear structure near N = 82 and the νπ interaction. To explore the structural similarity between the high-spin isomeric states in In (Z = 49), Sn (Z = 50), and Sb (Z = 51) isotopes from a microscopic point of view. In addition, to understand the role of a proton hole or particle in the spin-orbit partner orbitals, $π g_{9 / 2}$ and $π g_{7 / 2}$ , respectively, with neutron holes in the $ν h_{11 / 2}$ orbital on these aforementioned isomers. The fusion and transfer induced fission reaction ${}_{9}{Be} ({}_{238}U, f)$ with 6.2 MeV/u beam energy, using a unique setup consisting of AGATA, VAMOS++, and EXOGAM detectors, was used to populate through the fission process and study the neutron-rich ${}_{119, 121}{In}$ isotopes. This setup enabled the prompt-delayed $γ$ -ray spectroscopy of isotopes in the time range of $100 ns - 200 μ s$ . In the odd- $A {}_{119, 121}{In}$ isotopes, indications of a short half-life 19/2^- isomeric state, in addition to the previously known 25/2⁺ isomeric state, were observed from the present data. Further, new prompt transitions above the 25/2⁺ isomer in ${}_{121}{In}$ were identified along with reevaluation of its half-life. The experimental data were compared with the theoretical results obtained in the framework of large-scale shell-model calculations in a restricted model space. Furthermore, the $(π g_{9 / 2} ν h_{11 / 2}; I | \hat{H} | π g_{9 / 2} ν h_{11 / 2}; I)$ two-body matrix elements of residual interaction were modified to explain the excitation energies and the B(E2) transition probabilities in the neutron-rich In isotopes. The (i) decreasing trend of E (29/2⁺) - E (25/2⁺) in odd-In (with dominant configuration $π g_{9 / 2}^{- 1} ν h_{11 / 2}^{- 2}$ and maximum aligned spin of 29/2⁺) and (ii) increasing trend of E (27/2⁺) - E (23/2⁺) in odd-Sb (with dominant configuration $π g_{7 / 2}^{+ 1} ν h_{11 / 2}^{- 2}$ and maximum aligned spin of 27/2⁺) with increasing neutron number could be understood as a consequence of hole-hole and particle-hole interactions, respectively.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Polish National Science Centre (NCN); Ministry of Science, Spain

Grant/Contract Number:: AC02-05CH11231; 2016/22/M/ST2/00269; BES-2012-061407; SEV-2014-0398; FPA2017-84756-C4

OSTI ID:: 1783105

Journal Information:: Physical Review C, Vol. 102, Issue 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Prompt-delayed γ-ray spectroscopy of neutron-rich 119.121In isotopes

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Title: Prompt-delayed γ-ray spectroscopy of neutron-rich ^119.121In isotopes