CERN Accelerating science

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1.
Results of the $^{244}$Cm, $^{246}$Cm and $^{248}$Cm neutron-induced capture cross sections measurements at EAR1 and EAR2 of the n_TOF facility / nTOF Collaboration
Accurate neutron capture cross section data for minor actinides (MAs) are required to estimate the production and transmutation rates of MAs in light water reactors, critical fast reactors like Gen-IV systems, and other innovative reactor systems such as accelerator driven systems (ADS). In particular, 244Cm, 246Cm and 248Cm play a role in the transport, storage and transmutation of the nuclear waste of the current nuclear reactors, due to the contribution of these isotopes to the radiotoxicity, neutron emission, and decay heat in the spent nuclear fuel. [...]
2023 - 6 p. - Published in : EPJ Web Conf. 284 (2023) 01009 Fulltext: PDF;
In : 15th International Conference on Nuclear Data for Science and Technology, Online, 21 - 29 Jul 2022, pp.01009
2.
High resolution $^{80}$Se(n,γ) cross section measurement at CERN n_TOF / n_TOF Collaboration
Neutron capture cross section measurements of isotopes close to s-process branching-points are of fundamental importance for the understanding of this nucleosynthesis mechanism through which about 50% of the elements heavier than iron are produced. We present in this contribution the results corresponding to the high resolution measurement, for first time ever, of the $^{80}$Se(n, γ) cross section, in which 98 resonances never measured before have been reported. [...]
2023 - 6 p. - Published in : EPJ Web Conf. 284 (2023) 01001 Fulltext: PDF;
In : 15th International Conference on Nuclear Data for Science and Technology, Online, 21 - 29 Jul 2022, pp.01001
3.
Measurement of the $^{241}$Am(n,γ) cross section at the n_TOF facility at CERN / n_TOF Collaboration
The neutron capture cross section of $^{241}$Am is an important quantity for nuclear energy production and fuel cycle scenarios. Several measurements have been performed in recent years with the aim to reduce existing uncertainties in evaluated data. [...]
2023 - 4 p. - Published in : EPJ Web Conf. 284 (2023) 01036 Publication: PDF;
In : 15th International Conference on Nuclear Data for Science and Technology, Online, 21 - 29 Jul 2022, pp.01036
4.
Detector set up for the measurements of the neutron-induced fission cross section of $^{235}$U relative to n-p scattering up to 150 MeV at CERN-n_TOF / Pirovano, E (Braunschweig, Phys. Tech. Bund.) ; Manna, A (INFN, Bologna ; U. Bologna, DIFA) ; Colonna, N (INFN, Bari) ; Console Camprini, P (INFN, Bologna ; ENEA, Bologna) ; Cosentino, L (INFN, LNS) ; Dietz, M (Braunschweig, Phys. Tech. Bund.) ; Ducasse, Q (Braunschweig, Phys. Tech. Bund.) ; Finocchiaro, P (INFN, LNS) ; Massimi, C (INFN, Bologna ; U. Bologna, DIFA) ; Mengoni, A (INFN, Bologna ; ENEA, Bologna) et al.
A new measurement of the $^{235}$U(n,f) fission cross section was carried out at n_TOF. The experiment covered the neutron energy range from 10 MeV up to 500 MeV, and it used the 1H(n,n) cross section as normalization for the neutron fluence measurement. [...]
2023 - 5 p. - Published in : EPJ Web Conf. 284 (2023) 04019 Fulltext: PDF;
In : 15th International Conference on Nuclear Data for Science and Technology, Online, 21 - 29 Jul 2022, pp.04019
5.
Measurement of the $^{235}$U(n,f) cross section relative to the $^{10}$B(n,α) reaction with Micromegas detectors at the CERN n_TOF facility: First results / n_TOF Collaboration
Neutron cross section measurements are often made relative to a neutron cross section standard. Thus, the accuracy of the neutron standards determines the best possible accuracy of the neutron measurements. [...]
2023 - 4 p. - Published in : EPJ Web Conf. 284 (2023) 01030 Fulltext: PDF;
In : 15th International Conference on Nuclear Data for Science and Technology, Online, 21 - 29 Jul 2022, pp.01030
6.
Characterization of a detector setup for the measurement of the $^{235}$U(n,f) cross section relative to n-p scattering up to 500 MeV at the n_TOF facility at CERN / Manna, A (U. Bologna, DIFA ; INFN, Bologna) ; Pirovano, E (Braunschweig, Phys. Tech. Bund.) ; Colonna, N (INFN, Bari) ; Castelluccio, D (ENEA, Bologna ; INFN, Bologna) ; Camprini, P Console (ENEA, Bologna ; INFN, Bologna) ; Cosentino, L (INFN, LNS) ; Dietz, M (Braunschweig, Phys. Tech. Bund.) ; Ducasse, Q (Braunschweig, Phys. Tech. Bund.) ; Finocchiaro, P (INFN, LNS) ; Naour, C Le (Orsay, IPN) et al.
The measurement of the $^{235}$U(n,f) reaction cross section in the neutron energy region 10 MeV to 500 MeV was carried out at the CERN n_TOF facility. The experimental campaign, completed in 2018, provided precise and accurate data on the fission reaction relative to neutron-proton elastic scattering. [...]
2023 - 5 p. - Published in : EPJ Web Conf. 284 (2023) 04016 Fulltext: PDF;
In : 15th International Conference on Nuclear Data for Science and Technology, Online, 21 - 29 Jul 2022, pp.04016
7.
The Stellar $^{72}$Ge(n, γ) Cross Section for weak s-process: A First Measurement at n_TOF / Dietz, M (Edinburgh U. ; Braunschweig, Phys. Tech. Bund.) ; Lederer-Woods, C (Edinburgh U.) ; Tattersall, A (Edinburgh U.) ; Battino, U (Edinburgh U.) ; Gunsing, F (IRFU, Saclay ; CERN) ; Heinitz, S (PSI, Villigen) ; Lerendegui-Marco, J (Seville U.) ; Krtička, M (Charles U. ; Seville U.) ; Reifarth, R (Frankfurt U.) ; Valenta, S (Charles U.) et al.
The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics input for s-process studies. [...]
2023 - 4 p. - Published in : EPJ Web Conf. 284 (2023) 01017 Fulltext: PDF;
In : 15th International Conference on Nuclear Data for Science and Technology, Online, 21 - 29 Jul 2022, pp.01017
8.
Shedding Light on the Origin of Pb204, the Heaviest s-Process–Only Isotope in the Solar System / n_TOF Collaboration
Asymptotic giant branch stars are responsible for the production of most of the heavy isotopes beyond Sr observed in the solar system. Among them, isotopes shielded from the r-process contribution by their stable isobars are defined as s-only nuclei. [...]
2024 - 8 p. - Published in : Phys. Rev. Lett. 133 (2024) 052702 Fulltext: PDF;
9.
Measurement and analysis of the $^{246}$Cm and $^{248}$Cm neutron capture cross-sections at the EAR2 of the n_TOF facility at CERN / n_TOF Collaboration
The $^{246}$Cm(n,$\gamma$) and $^{248}$Cm(n,$\gamma$) cross-sections have been measured at the Experimental Area 2 (EAR2) of the n_TOF facility at CERN with three C$_6$D$_6$ detectors. This measurement is part of a collective effort to improve the capture cross-section data for Minor Actinides (MAs), which are required to estimate the production and transmutation rates of these isotopes in light water reactors and innovative reactor systems. [...]
arXiv:2407.06377.- 2024-12-10 - 20 p. - Published in : Eur. Phys. J. A 60 (2024) 246 Fulltext: 2407.06377 - PDF; document - PDF;
10.
Measurement of the prompt fission $\gamma $-rays from slow neutron-induced fission of $^{235}$U with STEFF / n_TOF Collaboration
The average energy and multiplicity of prompt $\gamma $-rays from slow neutron-induced fission of $^{235}$U have been measured using the STEFF spectrometer at the neutron time-of-flight facility n_TOF. The individual responses from 11 NaI scintillators were corrected for multiple $\gamma $-ray interactions, prompt fission neutrons and background counts before being deconvolved to estimate the emitted spectrum of prompt fission $\gamma $-rays. [...]
2024 - 11 p. - Published in : Eur. Phys. J. A 60 (2024) 70 Fulltext: PDF;

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