Neutron capture measurements and resonance parameters of dysprosium
SCIE
SCOPUS
- Title
- Neutron capture measurements and resonance parameters of dysprosium
- Authors
- Shin, S. G.; Kye, Y. U.; Namkung, W.; Cho, M. H.; Kang, Y. -R.; Lee, M. W.; Kim, G. N.; Ro, T. -I.; Danon, Y.; Williams, D.; Leinweber, G.; Block, R. C.; Barry, D. P.; Rapp, M. J.
- Date Issued
- 2017-10
- Publisher
- SPRINGER
- Abstract
- Neutron capture yields of dysprosium isotopes (Dy-161, Dy-162, Dy-163, and Dy-164) were measured using the time-of-flight method with a 16 segment sodium iodide multiplicity detector. The measurements were made at the 25m flight station at the Gaerttner LINAC Center at Rensselaer Polytechnic Institute. Resonance parameters were obtained using the multilevel R-matrix Bayesian code SAMMY. The neutron capture data for four enriched dysprosium isotopes and one natural dysprosium sample were sequentially fitted. New resonances not listed in ENDF/B-VII. 1 were observed. There were 29 and 17 new resonances from Dy-161 and Dy-163 isotopes, respectively. Six resonances from Dy-161 isotope, two resonances from Dy-163, and four resonances from Dy-164 were not observed. The capture resonance integrals of each isotope were calculated with the resulting resonance parameters and those of ENDF/B-VII. 1 in the energy region from 0.5 eV to 20MeV and were compared to the capture resonance integrals with the resonance parameters from ENDF/B-VII. 1. A resonance integral value of the natural dysprosium calculated with present resonance parameters was 1405 +/- 3.5 barn. The value is similar to 0.3% higher than that obtained with the ENDF/B-VII. 1 parameters. The distributions of the present and ENDF/B-VII. 1 neutron widths were compared to a Porter-Thomas distribution. Neutron strength functions for Dy-161 and Dy-163 were calculated with the present resonance parameters and both values were in between the values of "Atlas of Neutron Resonances" and ENDF/B-VII. 1. The present radiation width distributions of Dy-161 and Dy-163 were fitted with the chi(2) distribution by varying the degrees of freedom.
- Keywords
- CROSS-SECTIONS; DY; ISOTOPES; FISSION; WIDTHS; DY-161
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/91999
- DOI
- 10.1140/epja/i2017-12402-7
- ISSN
- 1434-6001
- Article Type
- Article
- Citation
- EUROPEAN PHYSICAL JOURNAL A, vol. 53, no. 10, 2017-10
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