Eur. Phys. J. A (2018) 54: 226
https://doi.org/10.1140/epja/i2018-12653-8

Regular Article - Experimental Physics

Neutron capture yields and resonance parameters of dysprosium isotopes measured at Japan Proton Accelerator Research Complex

¹ Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, 37673, Pohang, Republic of Korea
² Research Center, Dongnam Institute of Radiological and Medical Sciences, 46033, Busan, Republic of Korea
³ Department of Physics, Kyungpook National University, 41566, Daegu, Republic of Korea
⁴ Dong-A University, Department of Physics, 49315, Busan, Republic of Korea
⁵ Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, 152-8550, Tokyo, Japan

^* e-mail: gnkim@knu.ac.kr

Received: 3 August 2018
Accepted: 14 November 2018
Published online: 21 December 2018

Abstract

Neutron capture yields of dysprosium isotopes (¹⁶¹Dy, ¹⁶²Dy, ¹⁶³Dy, and ¹⁶⁴Dy) were measured using the time-of-flight method with a NaI(Tl) spectrometer locate at 27.9m from the spallation neutron target in the ANNRI beamline at the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. The resonance parameters were determined using the multilevel R-matrix Bayesian code SAMMY in the neutron energy range of 1 to 300eV. Five resonances of the ¹⁶¹Dy isotope, reported by Shin et al. but not presented in ENDF/B-VII.1, were confirmed in this study. One resonance of the ¹⁶⁴Dy isotope presented in ENDF/B-VII.1 was not observed in this study. The measured average level spacings were eV for ¹⁶¹Dy and eV for ¹⁶³Dy. The statistical distributions of the resonance parameters reasonably agreed with the Porter-Tomas distributions and multiple exit channel theory.