First Evidence of Shape Coexistence in the Ni-78 Region : Intruder 0(2)(+) State in Ge-80

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Gottardo , A , Verney , D , Delafosse , C , Ibrahim , F , Roussiere , B , Sotty , C , Roccia , S , Andreoiu , C , Costache , C , Delattre , M -C , Deloncle , I , Etile , A , Franchoo , S , Gaulard , C , Guillot , J , Lebois , M , MacCormick , M , Marginean , N , Marginean , R , Matea , I , Mihai , C , Mitu , I , Olivier , L , Portail , C , Qi , L , Stan , L , Testov , D , Wilson , J & Yordanov , D T 2016 , ' First Evidence of Shape Coexistence in the Ni-78 Region : Intruder 0(2)(+) State in Ge-80 ' , Physical Review Letters , vol. 116 , no. 18 , 182501 . https://doi.org/10.1103/PhysRevLett.116.182501

Title: First Evidence of Shape Coexistence in the Ni-78 Region : Intruder 0(2)(+) State in Ge-80
Author: Gottardo, A.; Verney, D.; Delafosse, C.; Ibrahim, F.; Roussiere, B.; Sotty, C.; Roccia, S.; Andreoiu, C.; Costache, C.; Delattre, M. -C.; Deloncle, I.; Etile, A.; Franchoo, S.; Gaulard, C.; Guillot, J.; Lebois, M.; MacCormick, M.; Marginean, N.; Marginean, R.; Matea, I.; Mihai, C.; Mitu, I.; Olivier, L.; Portail, C.; Qi, L.; Stan, L.; Testov, D.; Wilson, J.; Yordanov, D. T.
Contributor: University of Helsinki, Department of Chemistry
Date: 2016-05-05
Language: eng
Number of pages: 5
Belongs to series: Physical Review Letters
ISSN: 0031-9007
URI: http://hdl.handle.net/10138/195379
Abstract: The N = 48 Ge-80 nucleus is studied by means of beta-delayed electron-conversion spectroscopy at ALTO. The radioactive Ga-80 beam is produced through the isotope separation on line photofission technique and collected on a movable tape for the measurement of gamma and e(-) emission following beta decay. An electric monopole E0 transition, which points to a 639(1) keV intruder 0(2)(+) state, is observed for the first time. This new state is lower than the 2(1)(+) level in Ge-80, and provides evidence of shape coexistence close to one of the most neutron-rich doubly magic nuclei discovered so far, Ni-78. This result is compared with theoretical estimates, helping to explain the role of monopole and quadrupole forces in the weakening of the N = 50 gap at Z = 32. The evolution of intruder 0(2)(+) states towards Ni-78 is discussed.
Subject: SHELL-MODEL DESCRIPTION
FIRST EXCITED-STATE
NUCLEI
116 Chemical sciences
114 Physical sciences
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