Graduate Student Seminars

Physics Graduate Student Seminar with Nicolas Dronchi on The Two for one deal!

Nicolas Dronchi of Washington University in St. Louis will be presenting the Graduate Student Seminar on "The Two for one deal! Null result on a predicted near-threshold resonance in 7Li and Invariant-mass spectroscopy of 37,38Sc, 35Ca, and 34K near the proton drip-line"

The first part of this talk will focus on the search for an S-wave resonance in 7Li. Recent No Core Shell Model with Continuum (NCSMC) predictions show an S-wave resonance just above the particle decay threshold to 6He+p, indicating a near-threshold resonance [1]. The 6He(d,n)7Li reaction was employed at the Texas A&M Cyclotron Institute to selectively populate this resonance and search for its proton decay via the invariant-mass method. No evidence of this resonance was found, leading to a discussion on the origin of the calculated state within the NCSMC.

The second part of this talk will focus on the in-progress analysis of 37,38Sc, 35Ca, and 34K, all isotopes near the proton drip-line that were populated using a 37Ca beam on a beryllium target at the National Superconducting Cyclotron Laboratory. Invariant-mass spectroscopy has revealed the ground state masses of 37,38Sc and 34K. Excited states of all four isotopes are presented, serving as important tests of the Z=20 shell and N=16 subshell closures which have been observed to exist in this region of nuclei.

[1] Matteo Vorabbi, Petr Navrátil, Sofia Quaglioni, and Guillaume Hupin. Be-7 and Li-7 nuclei within the no-core shell model with continuum. Physical Review C, 100(2):024304, Aug 2019.