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Chiaveri, E.*; Aberle, O.*; Alcayne, V.*; 木村 敦; 他124名*
EPJ Web of Conferences, 239, p.17001_1 - 17001_8, 2020/09
被引用回数：5 パーセンタイル：95.30(Nuclear Science & Technology)Since the start of its operation in 2001, the neutron time of-flight facility of CERN, n_TOF, has become one of the most forefront neutron facilities in the world for wide-energy spectrum neutron cross section measurements. Thanks to the combination of excellent neutron energy resolution and high instantaneous neutron flux available in the two experimental areas, the second of which has been constructed in 2014, n_TOF is providing a wealth of new data on neutron-induced reactions of interest for nuclear astrophysics, advanced nuclear technologies and medical applications. In this document the main characteristics of the n_TOF facility and their relevance for neutron studies in the different areas of research will be outlined. In addition, the future perspectives of the facility will be described including the upgrade of the spallation target, the setup of an imaging installation and the construction of a new irradiation area.
Be(
He reaction and the cosmological lithium problem; Measurement of the cross section in a wide energy range at n_TOF at CERNBarbagallo, M.*; Musumarra, A.*; Cosentino, L.*; Maugeri, E.*; Heinitz, S.*; Mengoni, A.*; Dressler, R.*; Schumann, D.*; K
ppeler, F.*; 原田 秀郎; et al.
Physical Review Letters, 117(15), p.152701_1 - 152701_7, 2016/10
被引用回数：90 パーセンタイル：94.66(Physics, Multidisciplinary)The energy-dependent cross section of the Be(He reaction, of interest for the so-called cosmological lithium problem in big bang nucleosynthesis, has been measured for the first time from 10 meV to 10 keV neutron energy. Coincidences between the two alpha particles have been recorded in two Si-Be-Si arrays placed directly in the neutron beam. The present results are consistent, at thermal neutron energy, with the only previous measurement performed in the 1960s at a nuclear reactor. The energy dependence reported here clearly indicates the inadequacy of the cross section estimates currently used in BBN calculations. Although new measurements at higher neutron energy may still be needed, the n_TOF results hint at a minor role of this reaction in BBN, leaving the long-standing cosmological lithium problem unsolved.
