Mass measurement of Re-190

Abstract

In this paper, a measurement of the atomic mass and mass excess of Re 75 190 are presented. This isotope and Ir 77 192 were produced at the Maier-Leibnitz Laboratory (MLL) in Munich in the 192Os(d, α)190Re and 194Pt(d, α)192Ir reactions. The Q3D magnetic spectrograph was used to measure the momenta of the α-particle ejectiles in order to reconstruct states in both 190Re and 192Ir. A mass calibration was performed using known energy levels in 192Ir. These measurements were used to obtain a new value of the mass excess of 190Re, −35583 ± 5 keV. The previously known literature value is −35640 ± 70 keV.

Spectroscopic Analysis of the Energy-Level Structure in Rhenium-190

“…Previous to this work, the atomic mass of 190 Re had an uncertainty of ±70 keV [2]. Published mass-measurement results arising from this study have already reduced this uncertainty to ±5 keV [3]. The remainder of the study focuses on the investigations into the energy-level structure of 190 Re.…”