Jaime Benito García
(Grupo de Fisíca Nuclear, Facultad de Ciencias Físicas, Universidad Complutense de Madrid- CEI Moncloa, E-28040 Madrid, Spain)
Abstract
Exotic Sn isotopes with a few neutrons more than doubly magic $^{132}$Sn mass are excellent cases to study nuclear properties around shell closures. In this work, excited states in $^{133,134}$Sn isotopes were investigated by populating them during the beta decay of $^{133-135}$In isotopes. This investigation was performed in the framework of the IS610 at the ISOLDE-CERN facility where In was produced by spallation neutrons in a thick UC$_x$ target, selectively ionized by the ISOLDE Resonance Ionization Laser Ion Source, mass separated and transported to the ISOLDE Decay Station. The latter was equipped with four high-efficiency clover-type Ge detectors, and a compact set-up for fast timing studies consisting of a plastic beta-particle detector and ultrafast LaBr$_3$(Ce) scintillation detectors.
In this work we focus in the study of the lifetimes. The excited structure of $^{134}$Sn had been earlier investigated in $^{248}$Cm spontaneous fission experiments [1]. The observation of the cascade of three $\gamma$-rays of 174, 348, and 726 keV led to the identification of three excited levels at 1247, 107 and 726 keV as the three states arising from the two-neutron seniority scheme ($\nu$f$_{7/2}$)$^2$ with 6$^+$,4$^+$,2$^+$ spin-parity. In this work, those levels were studied from the $\beta$-decay of $^{134}$In as well as from the $\beta$-n decay of $^{135}$In. The high yields achieved during IS610 experiments allowed us to perform a complete fast-timing investigation carried out over those three levels. We report on the new half-lives measured in this work three levels, from whose the B(E2) transition rates were derived.
In addition we have also studied lifetimes in $^{133}$Sn. Its excited structure was already investigated from the beta-decay of $^{133}$In [2]. In this work, we report on the lifetime measurement of the 854-keV single particle state with p$_{3/2}$ dominant configuration compared with the previous value obtained at RIKEN [3].
[1] A. Korgul et al., Eur. Phys. J. A 7, 167 (2000).
[2] M. Piersa et al., Phys. Rev. C 99, 024304 (2018).
[3] V. Vaquero et al., Phys. Rev. Lett. 118, 202502 (2017).
Jaime Benito García
(Grupo de Fisíca Nuclear, Facultad de Ciencias Físicas, Universidad Complutense de Madrid- CEI Moncloa, E-28040 Madrid, Spain)
Prof.
Luis Fraile
(Universidad Complutense de Madrid)
Prof.
Agnieszka Korgul
(Faculty of Physics, University of Warsaw)
Srta.
Monika Piersa
(Faculty of Physics, University of Warsaw)
IS610 collaboration
(ISOLDE-CERN)
Raquel Álvarez-Rodriguez
(Universidad Politécnica de Madrid)
Giovanna Benzoni
(INFN, Sezione di Milano,Italy)
Tom Berry
(Deparment of Physics, University of Surrey, United Kingdom)
Maria Jose Garcia Borge
(Instituto de Estructura de la Materia)
Mariano Carmona
(Grupo de Física Nuclear and IPARCOS, Universidad Complutense, Spaiin)
K. Chrysalidis
(ISOLDE-CERN, Switzerland)
G. Correia
(ISOLDE-CERN)
C. Costache
(“Horia Hulubei” National Institute of Physics and Nuclear Engineering, Romania)
J. Cubiss
(University of York, United Kingdom)
H. De Witte
(Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Belgium)
T. Day Goodacre
(ISOLDE-CERN, Switzerland)
D. Fedorov
(ISOLDE-CERN, Switzerland)
G. Fernández-Martínez
(Institut für Kernphysik, Technische Universität Darmstadt, Germany.)
D. Galaviz
(Centro de Fisica Nuclear da UL, University of Lisbon, Portugal)
Pablo Galve Lahoz
(Grupo de Física Nuclear, Facultad de Físicas, Universidad Complutense - CEI Moncloa, E-28040 Madrid, Spain)
M. García
(Grupo de Física Nuclear and IPARCOS)
R. Grzywacz
(Department of Physics and Astronomy, University of Tennessee, USA.)
C. Henrich
(Institut für Kernphysik, Technische Universität Darmstadt, Germany.)
M. Huyse
(Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Belgium. )
Andres Illana Sison
(INFN-LNL)
Z. Janas
(Faculty of Physics, University of Warsaw, Poland)
K. Johnston
(ISOLDE-CERN, Switzerland)
V. Karayonchev
(Institut fur Kernphysik, Universität zu Koln, Germany)
M. Kicinska-Habior
(Faculty of Physics, University of Warsaw, Poland)
R. Lica
(“Horia Hulubei” National Institute of Physics and Nuclear Engineering, Romania)
M. Madurga
(Department of Physics and Astronomy, University of Tennessee, USA)
Alejandro López Montes
(Grupo de Física Nuclear , Facultad de Ciencias Físicas , C.E.I. Moncloa , E.28040 , Madrid , Spain)
Sra.
Irene Marroquín
(IEM-CSIC)
B. Marsh
(ISOLDE-CERN, Switzerland)
C. Martínez
(Grupo de Física Nuclear and IPARCOS, Universidad Complutense, Spain)
C. Mazzocchi
(Faculty of Physics, University of Warsaw, Poland)
K. Miernik
(Faculty of Physics, University of Warsaw, Poland)
R. Mihai
(“Horia Hulubei” National Institute of Physics and Nuclear Engineering, Romania)
B.Olaizola
(TRIUMF, Canada)
Paula Ibáñez García
(Universidad Complutense de Madrid)
S. Paulaskalas
(Department of Physics and Astronomy, University of Tennessee, USA.)
C. Raison
(University of York, United Kingdom.)
J.-M. Régis
(Institut fur Kernphysik, Universität zu Koln, Germany)
K. Rezynkina
(Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Belgium.)
S. Rothe
(ISOLDE-CERN, Switzerland)
Daniel Sanchez Parcerisa
(Universidad Complutense de Madrid)
Víctor Sánchez-Tembleque Verbo
(Grupo de FIsica Nuclear)
K. Schomacker
(Institut fur Kernphysik, Universität zu Koln, Germany)
G. Simpson
(LPSC, IN2P3 (CNRS), Université Grenoble Alpes, France)
Ch. Sotty
(“Horia Hulubei” National Institute of Physics and Nuclear Engineering, Romania)
L. Stan
(“Horia Hulubei” National Institute of Physics and Nuclear Engineering, Romania)
M. Stanoiu
(“Horia Hulubei” National Institute of Physics and Nuclear Engineering, Romania)
M. Stryjcyk
(Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Belgium)
A. Turturica
(ISOLDE-CERN, Switzerland)
Jose Udias
(Universidad Complutense de Madrid)
P. Van Duppen
(Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Belgium.)
Victoria Vedia
(Universidad Complutense Madrid (UCM))
AMAIA VILLA ABAUNZA
(Grupo de física nuclear, Facultad de Físicas. Universidad Complutense - CEI Moncloa, E-28040 Madrid, Spain)
W.B. Walters
(Departament of Chemistry, University of Maryland, USA)
N. Warr
(Institut fur Kernphysik, Universität zu Koln, Germany)
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