Martha Liliana Cortes
(RIKEN Nishina Center)
The Sn isotopes, containing the longest chain of isotopes between two doubly-magic nuclei, offer a fundamental testing ground for nuclear theories. Between the and shell closures, the energies of all Sn isotopes are well established and show an almost constant value, as expected in the generalized seniority scheme. Within the same framework, the values should resemble an inverted parabola peaking at mid-shell. However, measurements in the most proton-rich Sn isotopes have shown a clear deviation from the expected behavior, with an enhancement of the transition probabilities towards Sn. Although different calculations tend to agree on the neutron-rich side of the chain, significant differences are observed in the proton-rich side. This is particularly true for Sn, where the difference between the predictions amounts to almost a factor of 3, making this isotope a good candidate for the investigation of the effects driving the nuclear structure in the vicinity of Sn.
An experiment to measure for the first time the values in the isotones towards Sn, including Sn, was performed at the Radioactive Isotope Beam Factory in Japan. A 345 MeV/nucleon beam of Xe was fragmented on a 5-mm-thick Be target at the entrance of the BigRIPS separator. The isotones of interest were identified on an event-by-event basis using the technique. A 0.5-mm Au target placed at the F8 focal plane was used to induce Coulomb excitation. Outgoing fragments were identified using the ZeroDegree spectrometer. The Au target was surrounded by the high-efficiency DALI2 -detector array, composed of 226 NaI(Tl) detectors. Preliminary results on the Coulomb excitation cross sections and transition probabilities for Pd, Cd and Sn will be presented, and their comparison with shell model and ab-initio calculations will be discussed.
Martha Liliana Cortes
(RIKEN Nishina Center)
Alejandro Algora
(IFIC (CSIC-Univ. Valencia))
Frank Browne
(RIKEN Nishina Center)
Daniele Brugnara
(Instituto Nazionale di Fisica Nucleare (INFN)(INFN-Legnaro))
Joakim Cederkall
(Lund University)
Sidong Chen
(The University of Hong Kong)
Luigi Coraggio
(INFN)
Anna Corsi
(CEA Saclay)
Pieter Doornenbal
(RIKEN)
Angela Gargano
(INFN Milano)
Jürgen Gerl
(GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))
Magdalena Gorska-Ott
(GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))
Giovanni De Gregorio
(INFN Napoli)
G. Haefner
(Université Paris-Saclay,)
Nunzio Itaco
(INFN Napoli)
Takuma Koiwai
(The university of Tokyo)
K. Kokubun
( The University of Tokyo)
Pavlos Koseoglou
(IKP TU-Darmstadt / GSI)
S. Kubono
(RIKEN Nishina Center)
Jenny Lee
(The University of Hong Kong)
Pengjie Li
(Institute of Modern Physics, Chinese Academy of Sciences)
P. Liang
(The University of Hong Kong)
J. Liu
(The University of Hong Kong)
zhong liu
(Institute of Modern Physics, Chinese Academy of Sciences)
Taras Lokotko
(The University of Hong Kong)
Takayuki Miyagi
(TU Darmstadt)
Joochun Park
(Lund University)
Prof.
Hiroshi Sakurai
(RIKEN, Univ. of Tokyo)
Luis Gerardo Sarmiento Pico
(Lund University(LuU))
Achim Schwenk
(Technische Universität Darmstadt)
Ryo Taniuchi
(University of York)
Kathrin Wimmer
(GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))
W. Xian
(The University of Hong Kong)
Irene Zanon
(INFN-LNL)
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