Submission Date
5-14-2026
Document Type
Paper
Department
Physics & Astronomy
Adviser
Lew Riley
Committee Member
Lew Riley
Committee Member
Thomas Carroll
Department Chair
Thomas Carroll
External Reviewer
Mark-Christoph Spieker
Distinguished Honors
This paper has met the requirements for Distinguished Honors.
Project Description
We studied single-neuron states of the exotic nucleus 71Se with the one-neutron knockout reaction from a fast 72Se beam at the National Superconducting Cyclotron Laboratory. We measured the spectrum of γ-rays de-exciting states in 71Se using the Gretina γ-ray tracking array and the momentum of the 71Se reaction product with the S800 Magnetic Spectrograph. We utilized a supercomputer to run multiple Geant4 simulations and fit them to our γ-ray spectrum. The simulated spectrum was used to find the target position, energies of new γ-rays, and the lifetimes of some states that are not previously determined. We deduced cross sections for populating single-neutron excitations of 71Se from measured γ-ray yields. Our results provide an experimental test for nuclear shell model theory.
Recommended Citation
Himmelreich, Alyssa, "Gamma-ray Spectroscopy of One-Neutron Knockout From 72Se" (2026). Physics and Astronomy Honors Papers. 21.
https://digitalcommons.ursinus.edu/physics_astro_hon/21
