Time-energy relation of the n_TOF neutron beam: energy standards revisited

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Atıf İçin Kopyala

Lorusso G., Colonna N., Marrone S., Tagliente G., Heil M., Cano-Ott D., ...Daha Fazla

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, cilt.532, sa.3, ss.622-630, 2004 (SCI-Expanded)

• Yayın Türü: Makale / Tam Makale
• Cilt numarası: 532 Sayı: 3
• Basım Tarihi: 2004
• Doi Numarası: 10.1016/j.nima.2004.04.247
• Dergi Adı: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
• Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Sayfa Sayıları: ss.622-630
• Anahtar Kelimeler: spallation neutron source, moderation distance, neutron capture cross sections, neutron energy standards
• Bursa Uludağ Üniversitesi Adresli: Hayır

Özet

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. (C) 2004 Elsevier B.V. All rights reserved.