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CERN Document Server Pronađeno je 2,048 zapisa  1 - 10slijedećikraj  idi na zapis: Pretraživanje je potrajalo 1.67 sekundi 
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First measurement of the $^{94}$Nb($n$,$\gamma$) cross section at the CERN n_TOF facility / n_TOF Collaboration
One of the crucial ingredients for the improvement of stellar models is the accurate knowledge of neutron capture cross-sections for the different isotopes involved in the $s$-,$r$- and $i$- processes. These measurements can shed light on existing discrepancies between observed and predicted isotopic abundances and help to constrain the physical conditions where these reactions take place along different stages of stellar evolution.In the particular case of the radioactive $^{94}$Nb, the $^{94}$Nb($n$,$\gamma$) cross-section could play a role in the determination of the $s$-process production of $^{94}$Mo in AGB stars, which presently cannot be reproduced by state-of-the-art stellar models. [...]
arXiv:2301.11199.- 2023 - 8 p.
- Published in : EPJ Web Conf.: 279 (2023) , pp. 06004 Fulltext: 2301.11199 - PDF; document - PDF; Publication - PDF;
In : 10th Conference on Nuclear Physics in Astrophysics (NPA-X 2022), CERN, Geneva, Switzerland, 4 - 9 Sep 2022, pp.06004
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Towards a new generation of solid total-energy detectors for neutron-capture time-of-flight experiments with intense neutron beams / Balibrea-Correa, J. (Valencia U. ; Valencia U., IFIC) ; Babiano-Suarez, V. (Valencia U. ; Barcelona, Polytechnic U.) ; Lerendegui-Marco, J. (Valencia U. ; Valencia U., IFIC) ; Domingo-Pardo, C. (Valencia U. ; Valencia U., IFIC) ; Ladarescu, I. (Valencia U. ; Valencia U., IFIC) ; Tarifeño-Saldivia, A. (Valencia U. ; Valencia U., IFIC) ; de la Fuente-Rosales, G. (Valencia U. ; Valencia U., IFIC) ; Gameiro, B. (Valencia U. ; Valencia U., IFIC) ; Zaitseva, N. (LLNL, Livermore) ; Alcayne, V. (Madrid, CIEMAT) et al.
Challenging neutron-capture cross-section measurements of small cross sections and samples with a very limited number of atoms require high-flux time-of-flight facilities. In turn, such facilities need innovative detection setups that are fast, have low sensitivity to neutrons, can quickly recover from the so-called $\gamma$-flash, and offer the highest possible detection sensitivity. [...]
arXiv:2411.18969.- 2024-11-30 - 24 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1072 (2025) 170110 Fulltext: Publication - PDF; 2411.18969 - PDF;
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A Segmented Total Energy Detector (sTED) optimized for $(n,\gamma)$ cross-section measurements at n_TOF EAR2 / n_TOF Collaboration
The neutron time-of-flight facility n_TOF at CERN is a spallation source dedicated to measurements of neutron-induced reaction cross-sections of interest in nuclear technologies, astrophysics, and other applications. Since 2014, Experimental ARea 2 (EAR2) is operational and delivers a neutron fluence of $4\times 10^7$ neutrons per nominal proton pulse, which is 50 times higher than the one of Experimental ARea 1 (EAR1) of $8\times10^5$ neutrons per pulse. [...]
arXiv:2403.09759.- 2024-01-09 - 14 p. - Published in : Radiat. Phys. Chem. 217 (2024) 111525 Fulltext: 2403.09759 - PDF; Publication - PDF;
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Recent highlights and prospects on (n,$\gamma$) measurements at the CERN n_TOF facility / n_TOF Collaboration
Neutron capture cross-section measurements are fundamental in the study of the slow neutron capture (s-) process of nucleosynthesis and for the development of innovative nuclear technologies. [...]
arXiv:2310.15714. - 7 p.
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5.
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Pushing the high count rate limits of scintillation detectors for challenging neutron-capture experiments / Balibrea-Correa, J. (Valencia U. ; Valencia U., IFIC) ; Lerendegui-Marco, J. (Valencia U. ; Valencia U., IFIC) ; Babiano-Suarez, V. (Valencia U. ; Valencia U., IFIC) ; Domingo-Pardo, C. (Valencia U. ; Valencia U., IFIC) ; Ladarescu, I. (Valencia U. ; Valencia U., IFIC) ; Tarifeño-Saldivia, A. (Valencia U. ; Valencia U., IFIC) ; Fuente-Rosales, G. De La ; Alcayne, V. (Madrid, CIEMAT) ; Cano-Ott, D. (Madrid, CIEMAT) ; González-Romero, E. (Madrid, CIEMAT) et al.
One of the critical aspects for the accurate determination of neutron capture cross sections when combining time-of-flight and total energy detector techniques is the characterization and control of systematic uncertainties associated to the measuring devices. In this work we explore the most conspicuous effects associated to harsh count rate conditions: dead-time and pile-up effects. [...]
arXiv:2311.01365.- 2024-04-25 - 13 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1064 (2024) 169385 Fulltext: 2311.01365 - PDF; Publication - PDF;
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Measurement of the $^{154}$Gd(n,$\gamma$) cross section and its astrophysical implications / n_TOF Collaboration
The neutron capture cross section of $^{154}$Gd was measured from 1 eV to 300 keV in the experimental area located 185 m from the CERN n\_TOF neutron spallation source, using a metallic sample of gadolinium, enriched to 67$\%$ in $^{154}$Gd. The capture measurement, performed with four C$_{6}$D$_{6}$ scintillation detectors, has been complemented by a transmission measurement performed at the GELINA time-of-flight facility (JRC-Geel), thus minimising the uncertainty related to sample composition. [...]
arXiv:2002.02322.- 2020-05-10 - 14 p. - Published in : Phys. Lett. B 804 (2020) 135405 Article from SCOAP3: PDF; Fulltext: PDF;
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New detection systems for an enhanced sensitivity in key stellar (n,γ) measurements / n_TOF Collaboration
Neutron capture cross-section measurements are fundamental in the study of astrophysical phenomena, such as the slow neutron capture (s-) process of nucleosynthesis operating in red-giant and massive stars. However, neutron capture measurements via the time-of-flight (TOF) technique on key $s$-process nuclei are often challenging. [...]
arXiv:2303.08701.- 2023 - 7 p. - Published in : EPJ Web Conf. 279 (2023) 13001 Fulltext: 2303.08701 - PDF; document - PDF;
In : 10th Conference on Nuclear Physics in Astrophysics (NPA-X 2022), CERN, Geneva, Switzerland, 4 - 9 Sep 2022, pp.13001
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New insights on fission of $^{235}$U induced by high energy neutrons / n_TOF Collaboration
The $^{235}$U(n,f) reaction cross section was measured relative to neutron-proton elastic scattering for the first time in the energy region from 10 MeV to 440 MeV at the CERN n_TOF facility, extending the upper limit of the only previous measurement in the literature by more than 200 MeV. [...]
arXiv:2403.11711. - 19 p.
Fulltext
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Measurement of the $^{14}$N(n,p)$^{14}$C cross section at the CERN n_TOF facility from sub-thermal energy to 800 keV / n_TOF Collaboration
Background: The $^{14}$N(n,p)$^{14}$C reaction is of interest in neutron capture therapy, where nitrogen-related dose is the main component due to low-energy neutrons, and in astrophysics, where 14N acts as a neutron poison in the s-process. Several discrepancies remain between the existing data obtained in partial energy ranges: thermal energy, keV region and resonance region. [...]
arXiv:2212.05128.- 2023-06-29 - 15 p. - Published in : Phys. Rev. C 107 (2023) 064617 Fulltext: 2212.05128 - PDF; Publication - PDF;
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Advances and new ideas for neutron-capture astrophysics experiments at CERN n_TOF / n_TOF Collaboration
This article presents a few selected developments and future ideas related to the measurement of $(n,\gamma)$ data of astrophysical interest at CERN n_TOF. The MC-aided analysis methodology for the use of low-efficiency radiation detectors in time-of-flight neutron-capture measurements is discussed, with particular emphasis on the systematic accuracy. [...]
arXiv:2208.02163.- 2023-01-26 - 11 p. - Published in : Eur. Phys. J. A 59 (2023) 8 Fulltext: document - PDF; Publication - PDF; 2208.02163 - PDF;
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