Open AccessFirst Evidence of Shape Coexistence in theNi 78 0 2 + Ge 80
Author(s) -
A. Gottardo,
D. Verney,
C. Delafosse,
F. Ibrahim,
B. Roussière,
C. Sotty,
S. Roccia,
C. Andreoiu,
C. Costache,
M-C Delattre,
I. Deloncle,
A. Étilé,
S. Franchoo,
C. Gaulard,
J. Guillot,
M. Lebois,
M. MacCormick,
N. Mărginean,
R. Mărginean,
I. Matéa,
C. Mihai,
I. Mitu,
Laurie Olivier,
C. Portail,
Liqiang Qi,
L. Stan,
D. Testov,
J. N. Wilson,
D. T. Yordanov
Publication year - 2016
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.116.182501
Subject(s) - quadrupole , physics , spectroscopy , magic (telescope) , atomic physics , nuclear physics , quantum mechanics
International audienceThe 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
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