Neutron capture cross section measurement of 238U at the CERN n_TOF facility in the energy region from 1 eV to 700 keV

Znanstveni rad - Izvorni znanstveni rad

• Autor: F. Mingrone
• Autor: ...
• Autor: Petar Žugec; MBZ: 326085
• Autor: ...
• Autor: Damir Bosnar; MBZ: 134936
• Autor: ...
• Autor: T. Wright
• Kolaboracija: n_TOF Collaboration
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

The aim of this work is to provide a precise and accurate measurement of the 238U(n, γ) reaction cross section in the energy region from 1 eV to 700 keV. This reaction is of fundamental importance for the design calculations of nuclear reactors, governing the behavior of the reactor core. In particular, fast reactors, which are experiencing a growing interest for their ability to burn radioactive waste, operate in the high energy region of the neutron spectrum. In this energy region most recent evaluations disagree due to inconsistencies in the existing measurements of up to 15%. In addition, the assessment of nuclear data uncertainty performed for innovative reactor systems shows that the uncertainty in the radiative capture cross section of 238U should be further reduced to 1–3% in the energy region from 20 eV to 25 keV. To this purpose, addressed by the Nuclear Energy Agency as a priority nuclear data need, complementary experiments, one at the GELINA and two at the n_TOF facility, were proposed and carried out within the 7th Framework Project ANDES of the European Commission. The results of one of these 238U(n, γ) measurements performed at the n_TOF CERN facility are presented in this work. The γ-ray cascade following the radiative neutron capture has been detected exploiting a setup of two C6D6 liquid scintillators. Resonance parameters obtained from this work are on average in excellent agreement with the ones reported in evaluated libraries. In the unresolved resonance region, this work yields a cross section in agreement with evaluated libraries up to 80 keV, while for higher energies our results are significantly higher.

• Ključne riječi (engleski): neutron capture; 238U; n_TOF
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review C
• Brojčani podaci: vol. 95, br. 3, 034604
• p-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.95.034604
• URN:NBN: urn:nbn:hr:217:534623
• Datum objave publikacije: 2017
• URL dokumenta: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.95.034604
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Received 30 November 2016. Published 10 March 2017.
• Datum i vrijeme pohrane: 2020-02-28 19:12:52