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CERN Document Server Pronađeno je 89 zapisa  1 - 10slijedećikraj  idi na zapis: Pretraživanje je potrajalo 0.60 sekundi 
1.
$^{7}$ Be(n,p)$^{7}$ Li Cross Section Measurement for the Cosmological Lithium Problem at the n $\_$ TOF Facility at CERN / n_TOF Collaboration
One of the most puzzling problems in Nuclear Astrophysics is the “Cosmological Lithium Problem”, i.e the discrepancy between the primordial abundance of$^{7}$ Li observed in metal poor halo stars (Asplund et al. in Astrophys J 644:229–259, 2006, [1]), and the one predicted by Big Bang Nucleosynthesis (BBN). [...]
2019 - 8 p. - Published in : Springer Proc. Phys. 219 (2019) 25-32
In : Nuclei in the Cosmos XV (NIC XV), Assergi, Italy, 24 - 29 Jun 2018, pp.25-32
2.
The $^{7}$Be($\boldsymbol{n,p}$)$^{7}$Li reaction and the Cosmological Lithium Problem: measurement of the cross section in a wide energy range at n_TOF (CERN) / n_TOF Collaboration
We report on the measurement of the $^{7}$Be($n, p$)$^{7}$Li cross section from thermal to approximately 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n\_TOF facility at CERN. This reaction plays a key role in the lithium yield of the Big Bang Nucleosynthesis (BBN) for standard cosmology. [...]
arXiv:1803.05701; arXiv:1806.03050.- 2018 - 7 p. - Published in : Phys. Rev. Lett. 121 (2018) 042701 Fulltext: PDF;
3.
Dissemination of data measured at the CERN n_TOF facility / Dupont, E (IRFU, Saclay) ; Otuka, N ; Cabellos, O ; Aberle, O (CERN) ; Aerts, G ; Altstadt, S ; Alvarez, H ; Alvarez-Velarde, F ; Andriamonje, S ; Andrzejewski, J et al. /n_TOF
The n_TOF neutron time-of-flight facility at CERN is used for high quality nuclear data measurements from thermal energy up to hundreds of MeV. In line with the CERN open data policy, the n_TOF Collaboration takes actions to preserve its unique data, facilitate access to them in standardised format, and allow their re-use by a wide community in the fields of nuclear physics, nuclear astrophysics and various nuclear technologies. [...]
2017 - 4 p. - Published in : EPJ Web Conf. 146 (2017) 07002 Fulltext: PDF; External link: Fulltext
In : ND 2016 International Conference on Nuclear Data for Science and Technology, Bruges, Belgium, 11 - 16 Sep 2016, pp.07002
4.
Neutron-induced fission cross section of Np237 in the keV to MeV range at the CERN n_TOF facility / Diakaki, M ; Karadimos, D ; Vlastou, R ; Kokkoris, M ; Demetriou, P ; Skordis, E ; Tsinganis, A ; Abbondanno, U ; Aerts, G ; Álvarez, H et al.
The neutron-induced fission cross section of Np237 was experimentally determined at the high-resolution and high-intensity facility n_TOF, at CERN, in the energy range 100 keV to 9 MeV, using the U235(n,f) and U238(n,f) cross section standards below and above 2 MeV, respectively. A fast ionization chamber was used in order to detect the fission fragments from the reactions and the targets were characterized as far as their mass and homogeneity are concerned by means of α spectroscopy and Rutherford backscattering spectroscopy respectively. [...]
2016 - 12 p. - Published in : Phys. Rev. C 93 (2016) 034614 Fulltext: PDF;
5.
$^7Be(n,\alpha)^4He$ reaction and the Cosmological Lithium Problem: measurement of the cross section in a wide energy range at n_TOF (CERN) / n_TOF Collaboration
The energy-dependent cross section of the 7Be(n,alpha)4He 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. The challenges posed by the short half-life of 7Be and by the low reaction cross section have been overcome at n_TOF thanks to an unprecedented combination of the extremely high luminosity and good resolution of the neutron beam in the new experimental area (EAR2) of the n_TOF facility at CERN, the availability of a sufficient amount of chemically pure 7Be, and a specifically designed experimental setup. [...]
arXiv:1606.09420.- 2016-10-03 - 7 p. - Published in : Phys. Rev. Lett. 117 (2016) 152701 Fulltext: arXiv:1606.09420 - PDF; 10.1103_PhysRevLett.117.152701 - PDF; External link: Preprint
6.
Experimental setup and procedure for the measurement of the $^{7}Be(n,{\alpha}){\alpha}$ reaction at n_TOF / n_TOF collaboration
The newly built second experimental area EAR2 of the n_TOF spallation neutron source at CERN allows to perform (n, charged particles) experiments on short-lived highly radioactive targets. This paper describes a detection apparatus and the experimental procedure for the determination of the cross-section of the 7Be(n,{\alpha}) reaction, which represents one of the focal points toward the solution of the cosmological Lithium abundance problem, and whose only measurement, at thermal energy, dates back to 1963. [...]
arXiv:1604.00181.- 2016-09-11 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 830 (2016) 197-205 Fulltext: 10.1016_j.nima.2016.05.089 - PDF; arXiv:1604.00181 - PDF; External link: Preprint
7.
Nuclear Astrophysics at the n_TOF facility, CERN / Tagliente, G (INFN, Bari) ; Abbondanno, U (INFN, Trieste) ; Aerts, G (IRFU, Saclay) ; Alvarez, H (U. Santiago de Compostela (main)) ; Alvarez-Velarde, F (Madrid, CIEMAT) ; Andriamonje, S (IRFU, Saclay) ; Andrzejewski, J (U. Lodz (main)) ; Audouin, L (Karlsruhe, Forschungszentrum) ; Badurek, G (TU Vienna) ; Baumann, P (Strasbourg, IReS) et al.
Geneva : CERN, 2015 Published version from CERN: PDF;
In : 14th International Conference on Nuclear Reaction Mechanisms, Villa Monastero, Varenna, Italy, 15 - 19 Jun 2015, pp.267
8.
Measurement of the $^{240}$Pu(n,f) cross-section at the CERN n_TOF facility: first results from EAR-2 / Tsinganis, A (CERN ; Natl. Tech. U., Athens) ; Stamatopoulos, A (Natl. Tech. U., Athens) ; Colonna, N (INFN, Bari) ; Vlastou, R (Natl. Tech. U., Athens) ; Schillebeeckx, P (Geel, JRC) ; Plompen, A (Geel, JRC) ; Heyse, J (Geel, JRC) ; Kokkoris, M (Natl. Tech. U., Athens) ; Barbagallo, M (INFN, Bari) ; Berthoumieux, E (IRFU, Saclay) et al.
Geneva : CERN, 2015 Published version from CERN: PDF;
In : 14th International Conference on Nuclear Reaction Mechanisms, Villa Monastero, Varenna, Italy, 15 - 19 Jun 2015, pp.21
9.
Study of 234U(n,f) Resonances Measured at the CERN n_TOF Facility / Leal-Cidoncha, E (U. Santiago de Compostela (main)) ; Durán, I (U. Santiago de Compostela (main)) ; Paradela, C (U. Santiago de Compostela (main)) ; Tarrío, D (U. Santiago de Compostela (main)) ; Leong, L S (Orsay, IPN) ; Audouin, L (Orsay, IPN) ; Tassan-Got, L (Orsay, IPN) ; Praena, J (Seville U.) ; Berthier, B (Orsay, IPN) ; Ferrant, L (Orsay, IPN) et al.
We present the analysis of the resolved resonance region for the U-234(n,f) cross section data measured at the CERN n\_TOF facility. The resonance parameters in the energy range from 1 eV to 1500 eV have been obtained with the SAMMY code by using as initial parameters for the fit the resonance parameters of the JENDL-3.3 evaluation. [...]
2014 - 3. - Published in : Nucl. Data Sheets 119 (2014) 42-44
10.
Neutron-induced fission cross section of U234 measured at the CERN n_TOF facility / Karadimos, D ; Vlastou, R ; Ioannidis, K ; Demetriou, P ; Diakaki, M ; Vlachoudis, V (CERN) ; Pavlopoulos, P ; Konovalov, V ; Abbondanno, U ; Aerts, G et al.
The neutron-induced fission cross section of U234 has been measured at the CERN n_TOF facility relative to the standard fission cross section of U235 from 20 keV to 1.4 MeV and of U238 from 1.4 to 200 MeV. A fast ionization chamber (FIC) was used as a fission fragment detector with a detection efficiency of no less than 97%. [...]
2014 - 11 p. - Published in : Phys. Rev. C 89 (2014) 044606

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