Eur. Phys. J. A (2021) 57: 4
https://doi.org/10.1140/epja/s10050-020-00320-8

Letter

Discovery of a new low energy neutron resonance of ${}^{89}$Y

¹ Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1, Ookayama, 152-8550, Meguro-ku, Tokyo, Japan
² Japan Atomic Energy Agency, 2-4 Shirakata Shirane, 319-1195, Tokai, Ibaraki, Japan
³ Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2-1010 Asashironishi, Kumatori, 590-0494, Sennan-gun, Osaka, Japan

^a buchi@lane.iir.titech.ac.jp

Received: 26 August 2020
Accepted: 28 November 2020
Published online: 2 January 2021

Abstract

A new neutron resonance of ${}^{89}$Y was discovered by time-of-flight (TOF) neutron capture experiments using a pulsed neutron beam from a spallation neutron source of the Japan Proton Accelerator Research Complex. The observed resonance energy was 19.7 eV that is much lower than the lowest energy (2.60 keV) of the previous reported resonances. In addition to the TOF measurement, nuclide identification of the resonance was made by prompt $\gamma$-ray analysis. Neutron capture $\gamma$-rays from ${}^{89}$Y were clearly observed only on the resonance. Resonance analysis was applied to the experimental results and the resonance parameters of the new resonance are given.