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Time-energy relation of the n_TOF neutron beam: energy standards revisited
KTH, Superseded Departments, Physics.
Number of Authors: 119
2004 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 532, no 3, 622-630 p.Article in journal (Refereed) Published
Abstract [en]

The accurate determination of neutron cross-sections as a function of the neutron energy at a time-of-flight facility requires a precise knowledge of the time-energy relation for the neutron beam. For the n-TOF neutron beam at CERN, produced by spallation of high-energy protons on a Pb target, the time-energy relation is connected to the production mechanism and to the subsequent moderation process. A calibration of the neutron energy scale is proposed based on detailed Monte Carlo simulations of the facility. This time-energy relation has been experimentally validated by means of dedicated measurements of standard energy resonances, from 1 eV to approximately 1 MeV. On the basis of the present measurements, it is proposed to correct the energy of the 1.3 eV resonance of 193 Ir, which is commonly considered as an energy standard.

Place, publisher, year, edition, pages
2004. Vol. 532, no 3, 622-630 p.
Keyword [en]
spallation neutron source, moderation distance, neutron capture cross sections, neutron energy standards
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-40397DOI: 10.1016/j.nima.2004.04.247ISI: 000224657700009Scopus ID: 2-s2.0-4944249652OAI: oai:DiVA.org:kth-40397DiVA: diva2:441030
Note
QC 20110914. Author count: 119.Available from: 2011-09-14 Created: 2011-09-14 Last updated: 2017-12-08Bibliographically approved

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