Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session C04: Nuclear Reaction I
7:00 PM–9:45 PM,
Tuesday, November 28, 2023
Hilton Waikoloa Village
Room: Kings 2
Chair: Nobu Imai
Abstract: C04.00007 : Spectroscopy of neutron-rich nuclei using re-accelerated beams and direct reactions at TRIUMF*
8:30 PM–8:45 PM
Presenter:
Rituparna Kanungo
(Saint Mary's University (Canada))
Authors:
Rituparna Kanungo
(Saint Mary's University (Canada))
David G Walter
(Saint Mary's University & TRIUMF)
Mukhwinder Singh
(Saint Mary's University)
Gurmukh Singh
(Saint Mary's University)
Collaboration:
IRIS collaboration
Nuclei with large neutron-proton asymmetry unfold unconventional structures like neutron skin and halo and changes in the evolution of nuclear orbitals leading to disappearance of known shell closures and emergence of new ones. In regions where shells closures disappear coexisting diverse nuclear shapes can appear in closely spaced 0+ states in even-even nuclei. These unexpected features challenge nuclear models allowing to constrain our understanding of the nuclear force.
The thick neutron surface in neutron-rich nuclei also can give rise to new forms of collectivity at very low-excitation energy, called the soft dipole resonance. While dipole peaks below the giant dipole resonance have been seen in heavier neutron-rich Ni and Sn isotopes, they are at energies relatively high energies ~ 10 MeV. The dipole resonance at low-energy ~ 1 MeV has been observed in 11Li which opens the question if other drip-line nuclei exhibit this phenomenon.
We will present recent results from reaction spectroscopy studies with re-accelerated beams and the IRIS facility with solid D2 target at TRIUMF. The (d,p) transfer reaction results will be presented that brings new insight on the levels and shape evolution in neutron-rich 94Kr. Spectroscopic studies of 11Li and 8He with inelastic scattering will also be presented to explore the quadrupole collectivity and search for soft dipole resonance in 8He.
*The work is supported by NSERC, CFI, Research Nova Scotia, RCNP and the grant-in-aid program of the Japanese government. TRIUMF receives funding via a contribution through the National Research Council Canada. Physics.
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