[Triumf-seminars] TRIUMF Special Seminar today at 12:00

[TRIUMF Seminars]

Date/Time: Wed 2022-08-24 at 12:00

Location:  Remote              

Speaker:   Dayah Chrisman, (FRIB and Michigan State University)

Title:     Neutron-unbound states in the nucleus 31Ne

Abstract: Studies of nuclei far from stability reveal trends among groups of neighboring nuclei where new and
unexpected properties appear. One such region is the Island of Inversion near the N = 20 shell gap,
home to nuclei with reordered single-particle energy levels. Studies of the 31Ne nucleus have revealed
that its ground state has a halo component, described by a valence neutron orbiting a deformed
core. This lightly-bound nucleus with a separation energy of Sn = 0.15 +0.16 -0.10 MeV is expected to have excited states that are neutron unbound.
This work presents a first study of the neutron-unbound excited states of 31Ne, utilizing the MoNA-
LISA-Sweeper experimental setup at the National Superconducting Cyclotron Laboratory. The
neutron-unbound states in 31Ne were populated in a two-proton knockout reaction from an 89 MeV/u
33Mg beam. The 30Ne fragment and coincident neutron were detected and invariant mass spectroscopy
was used to reconstruct the two-body decay energy (30Ne + n).
The two-body decay energy spectrum exhibits two features: a low-lying peak at 0.30+-0.17 MeV
and a broad enhancement at 1.50+-0.33 MeV, each fit with an energy-dependent asymmetric Breit-
Wigner line shape representing a resonance in the continuum. Accompanying shell model calculations
combined with cross-section calculations using the eikonal reaction theory indicate that these features in the decay energy spectrum originate from multiple resonant states in 31Ne.
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https://us02web.zoom.us/j/81231065972?pwd=WnAzUE5LSXZ2L2ppR1RTb2luRlcwQT09 *************************
Meeting ID: 812 3106 5972**********Passcode: 473440 


Speaker is a candidate for a postdoctoral research associate position with the neutral atom trap for beta decay group

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