β-decay of Promethium-157 into Sammarium-157

Midshipman Researcher(s): 1/C Alex Leland

Adviser(s): Dr. Daryl Hartley

Poster #93

A level scheme for the β-decay of 157Pm already exists; however, it was never formally published. With the use of the CARIBU source, SATURN moving tape station, and X-ARRAY array of detectors, this level scheme could be improved. This research is intended to improve the unpublished level scheme by finding new energy levels and adding Nilsson states to them. 24 new γ-rays were detected and 11 new energy levels were added and assigned a Nilsson state. Ultimately, our motivation was to potentially find evidence of a recently proposed N=98 gap in energy to support the shell model of nuclei.

Full Size Physics #93