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CERN Document Server Намерени са 8 записа  Търсенето отне 0.71 секунди. 
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
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2.
Measurement of the $^{7}\mathrm{Be}(n,p)$ cross section at thermal energy / Tomandl, I (Rez, Nucl. Phys. Inst.) ; Vacík, J (Rez, Nucl. Phys. Inst.) ; Köster, U (Laue-Langevin Inst.) ; Viererbl, L (Rez, Nucl. Phys. Inst.) ; Maugeri, E A (PSI, Villigen) ; Heinitz, S (PSI, Villigen) ; Schumann, D (PSI, Villigen) ; Ayranov, M (PSI, Villigen) ; Ballof, J (CERN) ; Catherall, R (CERN) et al.
The Be7(n,p) cross section was measured with an ion-implanted Be7 target at a thermal neutron beam of the research reactor LVR-15 in Řež. The cross section to the ground state of Li7 is σ(n,p0)=43800±1400b and the cross section to the first excited state of Li7 is σ(n,p1)=520±260b..
2019 - 6 p. - Published in : Phys. Rev. C 99 (2019) 014612 Fulltext: PDF;
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3.
Preparation and characterization of three  $^{7}$Be targets for the measurement of the  $^{7}$Be(n, p) $^{7}$Li and  $^{7}$Be(n, $\alpha$) $^{7}$Li reaction cross sections / Maugeri, E A (PSI, Villigen) ; Heinitz, S (PSI, Villigen) ; Dressler, R (PSI, Villigen) ; Barbagallo, M (INFN, Bari) ; Ulrich, J (PSI, Villigen) ; Schumann, D (PSI, Villigen) ; Colonna, N (INFN, Bari) ; Köster, U (Laue-Langevin Inst.) ; Ayranov, M (European Commission, Luxembourg) ; Vontobel, P (PSI, Villigen) et al. /n_TOF
This manuscript describes the production of three targets obtained by implantation of different activities of $^7$Be into thin aluminium disks. Two of the produced targets were used to measure the $^7$Be(n, p)$^7$Li cross section in the energy range of interest for the Big-Bang Nucleosynthesis. [...]
2018 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 889 (2018) 138-144 Fulltext: PDF;
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4.
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;
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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
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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
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7.
Ti-44, Al-26 and Mn-53 samples for nuclear astrophysics: The needs, the possibilities and the sources / Dressler, R (PSI, Villigen) ; Ayranov, M (PSI, Villigen) ; Bemmerer, D (Forschungszentrum Dresden Rossendorf) ; Bunka, M (PSI, Villigen) ; Dai, Y (PSI, Villigen) ; Lederer, C (Vienna U.) ; Fallis, J (TRIUMF) ; Murphy, A StJ (Edinburgh U.) ; Pignatari, M (Basel U.) ; Schumann, D (PSI, Villigen) et al.
Exploration of the physics involved in the production of cosmogenic radionuclides requires experiments using the same rare, radioactive nuclei in sufficient quantities. For this work, such exotic radionuclides have been extracted from previously proton-irradiated stainless steel samples using wet chemistry separation techniques. [...]
2012 - 21 p. - Published in : J. Phys. G 39 (2012) 105201
Подробен запис
8.
Measurement of the $^{44}$Ti($\alpha$, p)$^{47}$V reaction cross section, of relevance to $\gamma$-ray observation of core collapse supernovae, using reclaimed $^{44}$Ti / Murphy, AStJ ; Aliotta, M ; Ayranov, M ; Bastin, B ; Bemmerer, D ; Bingham, R ; Bunka, M ; Butler, P ; Catherall, R ; Cocolios, TE et al.
CERN-INTC-2012-028 ; INTC-P-335. - 2012.
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