Proton Spectrum at the Jupiter Laser Facility of LLNL

TL;DR

This study analyzes gamma spectra from tungsten samples irradiated by various particles at LLNL to identify unstable nuclei and distinguish long-lived from short-lived isotopes over time.

Contribution

It provides detailed gamma spectral data and methods for identifying and differentiating isotopes produced by proton irradiation at a major laser facility.

Findings

Identification of specific unstable isotopes via gamma spectra

Distinction between long-lived and short-lived isotopes

Spectral data collected up to 80 days post-irradiation

Abstract

This paper looks at tungsten samples irradiated by beams of protons, gammas, electrons and positrons at the Jupiter Laser Facility of Lawrence Livermore National Laboratory (LLNL). The resulting unstable nuclei created are identified using their gamma spectra. These spectra were taken, usually within an hour of irradiation, for periods up to 48 hrs. In several cases there are two isotopes, one of Rhenium and the other of Tantalum, that emit the same gamma lines. These pairs often involve a long-lived and a short-lived candidate. Spectra were taken 80 days after initial exposure and the long-lived candidates are ruled out.