Alpha-decay-correlated mass measurement of 206,207Ra using an $\alpha$-TOF detector equipped MRTOF-MS system
Abstract
The atomic masses of the isotopes Ra have been measured via decay-correlated mass spectroscopy using a multi-reflection time-of-flight mass spectrograph equipped with an -TOF detector. The Ra isotopes were produced as fusion-evaporation products in the V+Tb reaction system and delivered by the gas-filled recoil ion separator GARIS-II at RIKEN. The -TOF detector provides for high-accuracy mass measurements by correlating time-of-flight signals with subsequent -decay events. The masses of Ra and Ra were directly measured using a multi-reflection time-of-flight mass spectrograph equipped with an -TOF detector. A mass excess of ME = 3538(15) keV/c and an excitation energy of E = 552(42) keV were determined. The -decay branching ratio of Ra, b = 0.26(20), was directly determined from decay-correlated time-of-flight signals, and the reduced alpha width of Ra was calculated to be = 50+62-41 keV from the branching ratio. The spin-parity of Ra was confirmed to be = 13/2 from decay correlated mass measurement results.
Keywords
Cite
@article{arxiv.2108.06245,
title = {Alpha-decay-correlated mass measurement of 206,207Ra using an $\alpha$-TOF detector equipped MRTOF-MS system},
author = {T. Niwase and M. Wada and P Schury and P. Brionnet and S. D. Chen and T. Hashimoto and H. Haba and Y. Hirayama and D. S. Hou and S. Iimura and H. Ishiyama and S. Ishizawa and Y. Ito and D. Kaji and S. Kimura and J. Liu and H. Miyatake and J. Y. Moon and K. Morimoto and K. Morita and D. Nagae and M. Rosenbusch and A. Takamine and T. Tanaka and Y. X. Watanabe and H. Wollnik and W. Xian and S. X. Ya},
journal= {arXiv preprint arXiv:2108.06245},
year = {2021}
}