Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session KG: Nuclear Structure V
10:30 AM–12:18 PM,
Saturday, October 29, 2022
Hyatt Regency Hotel
Room: Celestin G
Chair: Heather Crawford, Lawrence Berkeley National Laboratory
Abstract: KG.00002 : High spin band structure in 61Ni*
10:42 AM–10:54 AM
Presenter:
Soumik Bhattacharya
(Florida State University)
Authors:
Soumik Bhattacharya
(Florida State University)
Joachim Doring
(Bundesamt fur Strahlenschutz, Berlin, Germany)
Vandana Tripathi
(FSU)
Samuel O Ajayi
(Florida State University)
Caleb B Benetti
(Florida State University)
Lagy T Baby
(Florida State University)
Rebeka Sultana Lubna
(FRIB, MSU, USA)
Elizabeth Rubino
(NSCL Cyclotron Lab)
Samuel L Tabor
(Florida State University)
Yutaka Utsuno
(Japan Atomic Energy Agency, Tokai, Ibaraki, Japan)
Noritaka Shimizu
(Centre for Nuclear Study, University of Tokyo, Japan)
James M Allmond
(Oak Ridge National Lab)
With Z=28, Ni nuclei are expected to have spherical shapes near ground state & the low lying states for 56Ni (N=28) to 68Ni (N=40) are formed involving νp3/2, νf5/2, νp1/2 and νg9/2 orbitals. The occupancy of νg9/2 orbital induce deformation in mid-shell Ni isotopes & rotational bands have been reported in 56−59Ni. With moderate excitation energy, magnetic rotational (MR) bands and super-deformed bands were also observed in 60Ni and 63Ni, respectively. The MR bands in 60Ni has been explained involving a proton hole in f7/2 and neutron particle in g9/2. With an extra valance neutron, 61Ni expected to exhibit the similar collective excitation. Recently, a theoretical study also predicts non axial shapes & possibility of wobbling motion for 59-61Ni.
The present work populated 61Ni at high excitation energy & spin using the 50Ti(14C,3n)61Ni reaction (thin 50Ti enriched foil) at 40 MeV beam energy from the 9 MV Tandem accelerator at FSU. The de-excited γ-rays were detected using the FSU array of 6 BGO shielded clover & 3 single crystal HPGe detectors placed at 3 different angles; 90o, 45o and 135o. With γ−γ coincidence analysis, DCO ratio and polarization measurements the level scheme for 61Ni has been considerably extended up to 13 MeV and 35/2ℏ spin with the observation of 78 new transitions and 31 new levels with definite spin-parity. We have observed 2 dipole (M1) bands and 2 quadrupole (E2) bands for the first time in 61Ni. The lower states of the 61Ni are well reproduced by shell model calculation involving the g9/2 as well as d5/2 orbital. These dipole bands can be interpreted as magnetic rotational band which is expected in this region. The regular E2 structures are interpreted as rotational bands with small deformation.
*The work is supported by the U.S. NSF under grant number Phy-2012522
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