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Pb, the heaviest 
-process; Only isotope in the solar systemCasanovas-Hoste, A.*; 原田 秀郎; 木村 敦; 他130名*
Physical Review Letters, 133(5), p.052702_1 - 052702_8, 2024/07
被引用回数：3 パーセンタイル：48.32(Physics, Multidisciplinary)Tl(n, 
) cross section was measured at the CERN neutron time-of-flight facility n_TOF, employing a sample of only 9 mg of Tl produced at the Institute Laue Langevin high flux reactor. At the -process temperatures of kT 
8 keV and kT 30 keV, Maxwellian-averaged cross sections (MACS) of 580(168) mb and 260(90) mb, respectively. These figures are about 3% lower and 20% higher than the corresponding values widely used in astrophysical calculations, which were based only on theoretical calculations. By using the new Tl MACS, the uncertainty arising from the Tl(n, ) cross section on the -process abundance of Pb has been reduced from 
30% down to +8%/-6%, and the -process calculations are in agreement with the latest solar system abundance of Pb reported by K. Lodders in 2021.
Ce(n, ) cross section at n_TOF and its astrophysical implications for the chemical evolution of the universeAmaducci, S.*; 原田 秀郎; 木村 敦; 他130名*
Physical Review Letters, 132(12), p.122701_1 - 122701_8, 2024/03
被引用回数：4 パーセンタイル：68.78(Physics, Multidisciplinary)Ce(n,) is a key reaction for slow neutron-capture (-process) nucleosynthesis due to being a bottleneck in the reaction flow. For this reason, it was measured with high accuracy (uncertainty 5%) at the n_TOF facility, with an unprecedented combination of a high purity sample and low neutron-sensitivity detectors. The measured Maxwellian averaged cross section is up to 40% higher than previously accepted values. Stellar model calculations indicate a reduction around 20% of the s-process contribution to the Galactic cerium abundance and smaller sizeable differences for most of the heavier elements. No variations are found in the nucleosynthesis from massive stars.
Patronis, N.*; 木村 敦; 他130名*
EPJ Techniques and Instrumentation (Internet), 10, p.13_1 - 13_10, 2023/05
During the second long shutdown period of the CERN accelerator complex (LS2, 2019-2021), several upgrade activities took place at the n_TOF facility. The most important have been the replacement of the spallation target with a next generation nitrogen-cooled lead target. Additionally, a new experimental area, at a very short distance from the target assembly (the NEAR Station) was established. In this paper, the core commissioning actions of the new installations are described. The improvement in the n_TOF infrastructure was accompanied by several detector development projects. All these upgrade actions are discussed, focusing mostly on the future perspectives of the n_TOF facility. Furthermore, some indicative current and future measurements are briefly reported.
Moreno-Soto, J.*; 木村 敦; 他130名*
Physical Review C, 105(2), p.024618_1 - 024618_14, 2022/02
被引用回数：2 パーセンタイル：32.42(Physics, Nuclear)The -ray spectra from neutron-capture reactions on the 
U, 
U, and 
U nuclei have been measured with the total absorption calorimeter of the n_TOF facility at CERN. The background-corrected sum-energy and multi-step-cascade spectra were extracted for several isolated s-wave resonances up to about 140 eV. The experimental spectra were compared to statistical model predictions coming from a large selection of models of photon strength functions (PSFs) and nuclear level density (NLD). No combination of PSF and NLD models from literature is able to globally describe our spectra. After extensive search we were able to find model combinations with modified generalized Lorentzian (MGLO) E1 PSF, which match the experimental spectra as well as the total radiative widths.
Ge(n,) cross section at the n_TOF facility at CERNGawlik, A.*; 原田 秀郎; 木村 敦; 他130名*
Physical Review C, 104(4), p.044610_1 - 044610_7, 2021/10
被引用回数：5 パーセンタイル：51.80(Physics, Nuclear)The Ge(n,) reaction has been measured at the n_TOF facility at CERN via the time-of-flight technique. Neutron capture cross sections on Ge are of interest to a variety of low-background experiments, such as neutrinoless double 
decay searches, and to nuclear astrophysics. We have determined resonance capture kernels up to 52 keV neutron energy and used the new data to calculate Maxwellian-averaged neutron capture cross sections for k
T values of 5 to 100 keV.
Chen, Y. H.*; Tassan-Got, L.*; 原田 秀郎; 木村 敦; n_TOF Collaboration*; 他130名*
EPJ Web of Conferences, 146, p.03020_1 - 03020_4, 2017/09
被引用回数：1 パーセンタイル：58.26(Nuclear Science & Technology)CERNの中性子飛行時間測定施設において、長い中性子飛行距離を有する第1実験室に加え、短い中性子飛行距離位置に第2実験室を設計・建設した。パラレル・プレート・アバランチェ・カウンター(PPAC)を用いて、第2実験室における中性子ビームの空間的広がり及びエネルギー分布を測定した。また、第1実験室で観測され時間校正に使用されてきた線フラッシュは観測されないという知見が得られ、本観測結果に基づき、線フラッシュの物理的起源に関する考察結果を示した。
