17-21 July 2017
Santiago de Compostela, Facultade de Química
Europe/Madrid timezone

Gamma and fast-timing spectroscopy around 132Sn from the beta-decay of In isotopes

17 Jul 2017, 15:55
Aula Química Física (Facultade de Química (USC))

Aula Química Física

Facultade de Química (USC)

Nuclear Physics Nuclear Physics I


Mr. Jaime Benito García (Grupo de Fisíca Nuclear, Facultad de Ciencias Físicas, Universidad Complutense de Madrid- CEI Moncloa, E-28040 Madrid, Spain)


During the last two decades there has been a substantial effort directed to gather information about the region around the neutron-rich 132Sn [1], the most exotic doubly-magic nucleus presently at reach. Nuclei with a large N/Z ratio in this area of the table of isotopes are of great interest to test nuclear models and provide information about single particle states. Stringent tests of the models can be provided by the reduced electromagnetic transition probabilities connecting nuclear states. In this work we have used fast-timing and gamma spectroscopy to investigate five Sn nuclei, including the doubly magic 132Sn, the two neutron hole 130Sn and two-neutron particle 134Sn, and the one-neutron hole 131Sn and one-neutron particle 133Sn. The Sn isotopes were studied at the ISOLDE facility, where their excited states were populated in the beta-decay of In isomers, produced in a UCx target unit equipped with a neutron converter. The In isomers were ionized using the ISOLDE Resonance Ionization Laser Ion Source (RILIS), which for the first time allowed isomer-selective ionization of indium. The measurements took place at the new ISOLDE Decay Station (IDS), equipped with four highly efficient clover-type Ge detectors, along with a compact fast-timing setup consisting on two LaBr3(Ce) detectors and a fast beta detector. The setup incorporated a tape transport system to remove longer-lived activities. Indium isotopes with masses ranging from 130 to 134 were produced. The RILIS isomer selectivity made it possible to produce odd-mass In isotopes with a clean separation between the 9/2+ and 1⁄2– beta-decaying isomers. For the even isotopes, such as 130In, it was also possible to separate the 5+, 10– and 1– isomers. We report on the lifetime of the 331-keV 1/2+ level in 131Sn, which provides information on the M1 transition to the ground state and on its degree of forbiddeness, similar to what has been recently been measured for 129Sn [2]. We also report on the expanded level scheme of the 131Sn and the preliminary lifetimes of excited states populated in the decay of the 131In (21/2+) isomer. The 132Sn was studied by means of the beta-decay of 132In, and also from the beta-n decay of the 133In 1/2– isomer and the 133In 9/2+ g.s. separately. We present the new level scheme, which have been enlarged with more than 8 new levels and 40 gamma transitions. A crosscheck of previously measured known lifetimes is also provided [3]. References [1] A. Korgul et al, Phys Rev Lett 113,132502(2014) [2] R. Lica et al., Phys Rev C93 044303 (2016) [3] B. Fogelberg et al Phys. Rev. Lett. 73, 2413(1996)

Primary author

Mr. Jaime Benito García (Grupo de Fisíca Nuclear, Facultad de Ciencias Físicas, Universidad Complutense de Madrid- CEI Moncloa, E-28040 Madrid, Spain)


Mrs. AMAIA VILLA ABAUNZA (Grupo de física nuclear, Facultad de Físicas. Universidad Complutense - CEI Moncloa, E-28040 Madrid, Spain) Agnieska Korgul (University of Warsaw) Andrei Turturica (IFIN-HH Bucharest) Andrés Illana (Instituut voor Kern- an Stralingsfysica, K.U. Leuven, Leuven, Belgium.) Bruce Marsh (ISOLDE CERN) Mr. Bruno Olaizola (Grupo de Física Nuclear - Universidad Complutense de Madrid, España) Chiara Mazzocchi (University of Warsaw) Christophe Sotty (IFIN-HH Bucharest) Corinna Henrich (Institut fuer Kernphysik, Technidche Universität Darmstadt, Germany) Cristina Martinez (Universidad Complutense de Madrid) Dr. Daniel Galaviz Redondo (Centro de Física Nuclear da ULisboa) Gary Simpson (LPSC Grenoble) Giovana Benzoni (INFN, Sezione di Milano) Guilherme Correia (Isolde-CERN, Geneva, Switzerland) Guillermo Fernandez-Martinez (Institut fuer Kernphysik, Technidche Universität Darmstadt, Germany.) Hilde De Witte (Isolde-CERN, Geneva, Switzerland) Ms. Irene Marroquín (IEM-CSIC) Jean-Marc Régis (IKP Köln) Jose Udias (Universidad Complutense de Madrid) Karl Johnston (ISOLDE CERN) Katerina Chrysalidis (Isolde-CERN, Geneva) Lucian Stan (IFIN-HH Bucharest) Dr. Luis Fraile (Universidad Complutense de Madrid) Marek Stryjcyk (KU Leuven) Prof. Maria Jose Garcia Borge (ISOLDE-CERN) Mariano Carmona (Universidad Complutense de Madrid) Mark Huyse (9Institut fuer Kernphysik, Technidche Universität Darmstadt, Germany) Marta Kicinska-Habior (University of Warsaw) Miernik Krzysztof (U Warsaw) Miguel Madurga (ISOLDE-CERN) Mihai Stanoiu (IFIN-HH Bucharest) Monika Piersa (University of Warsaw) Nigel Warr (IKP Köln) Piet Van Duppen (KU Leuven) Radu Mihai (IFIN-HH Bucharest) Raquel Álvarez Rodriguez (Universidad Politecnica de Madrid) Razvan Lica (ISOLDE CERN) Robert Grzywacz (Department of Physics and Astronomy, University of Tennessee, Knoxville) Sebastian Rothe (ISOLDE CERN) Stan Paulaskalas (U Tennessee) Thomas Day Goodacre (CERN) Tom Berry (Deparment of Physics, University of Surrey, United Kingdom.) Vasil Karayonchev (IKP Köln) Victor Sanchez Tembleque (Universidad Complutense de Madrid) Mrs. Victoria Vedia (Universidad Complutense Madrid (UCM)) William Walters (U Maryland) Zenon Janana (aculty of Physics, University of Warsaw, Warsaw, Poland.)

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