Measurements of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of ^161162163Dy

Abstract

The neutron capture cross sections and capture γ-ray spectra of ^{161 162 163}Dy were measured in the neutron energy region of 10 to 90 keV and at 550 keV. A neutron time-of-flight method was adopted with a ns-pulsed neutron source by the ⁷Li(p, n)⁷Be reaction and with a large anti-Compton NaI(Tl) γ-ray spectrometer. A pulse-height weighting technique was applied to observed capture γ-ray pulse-height spectra to derive capture yields. The capture cross sections were obtained with the error of about 5% by using the standard capture cross sections of ¹⁹⁷Au. The present results were compared with previous measurements and the evaluated values of ENDF/B-VI. Capture γ-ray spectra were obtained by unfolding observed capture γ-ray pulse-height spectra. An anomalous bump was observed around 2.5 MeV in the γ-ray spectra of each isotope, and the energy position of the bump was consistent with the systematics obtained in our previous work.

KEYWORDS:

• keV range 10–100
• keV range 100–1000
• neutron capture
• cross sections
• gamma spectra
• dysprosium 161
• dysprosium 162
• dysprosium 163
• gold 197
• anti-Compton NaI(Tl) spectrometer
• time-of-flight method
• pulse-height weighting technique
• experimental data
• evaluations