Radu-Emanuel Mihai
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
The assignment of the first 2$^+$ state in $^{62}$Ga has been a subject of debate in the last decades due to its implications in triplet energy difference systematics in this mass region[1]. To clarify this, an experiment was performed at the IFIN-HH 9-MV Tandem accelerator using the ROSPHERE[2] array in a mixed configuration of LaBr$_3$(Ce), HPGe and liquid scintillator neutron detectors. Excited states in $^{62}$Ga were populated through the $^{58}$Ni($^{6}$Li, $2n $) fusion-evaporation reaction. The precise angular anisotropy ratio determined in this experiment for a 978.1-keV transition to the ground state in $^{62}$Ga reveals that we have indeed populated the lowest-lying 2$^+$ state. This state's newly assigned spin and parity positions the $A=62$ isovector triplet within the typical range of values in the $T=1$, $J^\pi = 2^+$ fractional triplet energy difference systematics. The interplay between the isospin-symmetry breaking and shape-coexistence effects in the $A=62$ isovector triplet was theoretically treated within the beyond-mean-field complex excited Vampir variational model. Theoretical results indicate agreement with the experimental data on the discussed observables.
[1] T.W. Henry $\it et$ $al.$, Phys. Rev. C 92, 024315 (2015).
[2] D. Bucurescu $\it et$ $al.$, NIM A 837 (2016).
Radu-Emanuel Mihai
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Adina Olacel
(Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH))
Mr
Adrian Mare
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Adriana Ioana Gheorghe
(Horia Hulubei National Institute of Physics and Nuclear Enginee)
Alexandrina Petrovici
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Alexandru Liviu Negret
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Dr
Alina Ionescu
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Dr
Andreea Mitu
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Andreea Oprea
(European Commission Joint Research Centre)
Dr
Andreea Serban
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Dr
Andrei Turturica
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Christophe Sotty
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Constantin Mihai
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Cristian Costache
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Cristina Clisu
(IFIN-HH (RO))
Cristina-Roxana Nita
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Dan Filipescu
(IFIN-HH Bucharest (RO))
Dr
Dorel Bucurescu
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Dr
Gheorghe Cata-Danil
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Dr
Irina Dinescu
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Dr
Lucian Stan
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Marian Alexandru Boromiza
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Nicolae Marginean
(Horia Hulubei National Institute of Physics and Nuclear Enginee)
Dr
Nicoleta Florea
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Dr
Oana Andrei
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Raluca-Maria Marginean
(H)
Rares Suvaila
(H)
Razvan Lica
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Sebastian Toma
(Horia Hulubei National Institute of Physics and Nuclear Enginee)
Sorin Gabriel Pascu
(Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))
Sorin Ujeniuc
(IFIN-HH (RO))
