Year: 2021
Type: article
Abstract: The $\ensuremath{\beta}$ decay of the neutron-rich $^{134}\mathrm{In}$ and $^{135}\mathrm{In}$ was investigated experimentally in order to provide new insights into the nuclear structure of the tin isotopes with magic proton number $Z=50$ above the $N=82$ shell. The $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$-ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where indium isotopes were selectively laser-ionized and on-line mass separated. Three $\ensuremath{\beta}$-decay branches of $^{134}\mathrm{In}$ were established, two of which were observed for the first time. Population of neutron-unbound states decaying via $\ensuremath{\gamma}$ rays was identified in the two daughter nuclei of $^{134}\mathrm{In}, ^{134}\mathrm{Sn}$ and $^{133}\mathrm{Sn}$, at excitation energies exceeding the neutron separation energy by 1 MeV. The $\ensuremath{\beta}$-delayed one- and two-neutron emission branching ratios of $^{134}\mathrm{In}$ were determined and compared with theoretical calculations. The $\ensuremath{\beta}$-delayed one-neutron decay was observed to be dominant $\ensuremath{\beta}$-decay branch of $^{134}\mathrm{In}$ even though the Gamow-Teller resonance is located substantially above the two-neutron separation energy of $^{134}\mathrm{Sn}$. Transitions following the $\ensuremath{\beta}$ decay of $^{135}\mathrm{In}$ are reported for the first time, including $\ensuremath{\gamma}$ rays tentatively attributed to $^{135}\mathrm{Sn}$. In total, six new levels were identified in $^{134}\mathrm{Sn}$ on the basis of the $\ensuremath{\beta}\ensuremath{\gamma}\ensuremath{\gamma}$ coincidences observed in the $^{134}\mathrm{In}$ and $^{135}\mathrm{In}\phantom{\rule{4pt}{0ex}}\ensuremath{\beta}$ decays. A transition that might be a candidate for deexciting the missing neutron single-particle $13/{2}^{+}$ state in $^{133}\mathrm{Sn}$ was observed in both $\ensuremath{\beta}$ decays and its assignment is discussed. Experimental level schemes of $^{134}\mathrm{Sn}$ and $^{135}\mathrm{Sn}$ are compared with shell-model predictions. Using the fast timing technique, half-lives of the ${2}^{+}, {4}^{+}$, and ${6}^{+}$ levels in $^{134}\mathrm{Sn}$ were determined. From the lifetime of the ${4}^{+}$ state measured for the first time, an unexpectedly large $B(E2;{4}^{+}\ensuremath{\rightarrow}{2}^{+})$ transition strength was deduced, which is not reproduced by the shell-model calculations.
Source: Physical Review C
Authors: M. Piersa-Siłkowska, A. Korgul, J. Benito, L. M. Fraile, E. Adamska, A. N. Andreyev, R. Álvarez-Rodríguez, A. E. Barzakh, G. Benzoni, T. Berry, M. J. G. Borge, M. Carmona, K. Chrysalidis, J. G. Correia, C. Costache, J. G. Cubiss, T. Day Goodacre, H. De Witte, D. V. Fedorov, V. N. Fedosseev, G. Fernández-Martínez, A. Fijałkowska, H. Fynbo, D. Galaviz, P. Galve, M. García-Díez, P. T. Greenlees, R. Grzywacz, L. J. Harkness-Brennan, C. Henrich, M. Huyse, P. Ibáñez, A. Illana, Z. Janas, K. Johnston, J. Jolie, D. S. Judson, V. Karanyonchev, M. Kicińska-Habior, J. Konki, Ł. Koszuk, J. Kurcewicz, I. Lazarus, R. Lică, A. López-Montes, H. Mach, M. Madurga, I. Marroquín, B. Marsh, M. C. Martínez, C. Mazzocchi, K. Miernik, C. Mihai, N. Mărginean, R. Mărginean, A. Negret, E. Nácher, J. Ojala, B. Olaizola, R. D. Page, J. Pakarinen, S. Pascu, S. V. Paulauskas, A. Perea, V. Pucknell, P. Rahkila, C. Raison, E. Rapisarda, K. Rezynkina, F. Rotaru, S. Rothe, K. P. Rykaczewski, J.-M. Régis, K. Schomacker, M. Siłkowski, G. Simpson, C. Sotty, L. Stan, M. Stănoiu, M. Stryjczyk, D. Sánchez-Parcerisa, V. Sánchez-Tembleque, O. Tengblad, A. Turturică, J. M. Udías, P. Van Duppen, V. Vedia, A. Villa, S. Viñals, R. Wadsworth, W. B. Walters, N. Warr, S. G. Wilkins
Institutions: University of Warsaw, Universidad Complutense de Madrid, European Organization for Nuclear Research, University of York, Universidad Politécnica de Madrid, Kurchatov Institute, Petersburg Nuclear Physics Institute, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, University of Surrey, Consejo Superior de Investigaciones Científicas, Instituto de Estructura de la Materia, University of Lisbon, Instituto Superior Técnico, Centro de Ciências e Tecnologias Nucleares, Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering, University of Manchester, KU Leuven, Technische Universität Darmstadt, Aarhus University, Universidade Politécnica de Lisboa, LIP - Laboratory of Instrumentation and Experimental Particle Physics, University of Helsinki, Helsinki Institute of Physics, University of Jyväskylä, Oak Ridge National Laboratory, University of Tennessee at Knoxville, University of Liverpool, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, University of Cologne, National Centre for Nuclear Research, Universitat de València, Instituto de Física Corpuscular, TRIUMF, University of Guelph, Centre National de la Recherche Scientifique, Institut National de Physique Nucléaire et de Physique des Particules, Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble Alpes
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G1077405606, G1874176281, G220734465, G246510648, Nuclear Physics Consolidated Grant 21-24 - University of York, G3007769980, G3220619234, G3429310728, G3790215798, Nuclear Physics Consolidated Grant, G434337789, G4455969002, Nuclear Physics Consolidated Grant 2020, G4702842366, European Nuclear Science and Application Research 2, G5030663475, G5454278309, G5864096073, Nuclear Physics Consolidated Grant, Verbundprojekt 05P2018 - ISOLDE: Experimente an ISOLDE (CERN) und Detektorentwicklung für das Miniball-Spektrometer, G6507375455, Investigação em Materiais com Isótopos e Técnicas Nucleares Radioativas no ISOLDE-CERN, G6657585232, G7082598299, PORTUGAL no ISOLDE : Investigação em Física de Materiais e Nuclear com Isótopos e Técnicas Radioativas, Nuclear Physics Consolidated Grant, Nuclear Physics Consolidated Grant, G8371644053, G8988936500
OpenAlex ID: W3210132044