Be-7 (n,p)Li-7 Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN

Damone, L. and Barbagallo, M. and Mastromarco, M. and Mengoni, A. and Cosentino, L. and Maugeri, E. and Heinitz, S. and Schumann, D. and Dressler, R. and Kaeppeler, F. and Colonna, N. and Finocchiaro, P. and Andrzejewski, J. and Perkowski, J. and Gawlik, A. and Aberle, O. and Altstadt, S. and Ayranov, M. and Audouin, L. and Bacak, M. and Balibrea-Correa, J. and Ballof, J. and Becares, V. and Becvar, F. and Beinrucker, C. and Bellia, G. and Bernardes, A. P. and Berthoumieux, E. and Billowes, J. and Borge, M. J. G. and Bosnar, D. and Brown, A. and Brugger, M. and Busso, M. and Caamano, M. and Calvino, F. and Calviani, M. and Cano-Ott, D. and Cardella, R. and Casanovas, A. and Castelluccio, D. M. and Catherall, R. and Cerutti, F. and Chen, Y. H. and Chiaveri, E. and Correia, J. G. M. and Cortes, G. and Cortes-Giraldo, M. A. and Cristallo, S. and Diakaki, M. and Dietz, M. and Domingo-Pardo, C. and Dorsival, A. and Dupont, E. and Duran, I. and Fernandez-Dominguez, B. and Ferrari, A. and Ferreira, P. and Furman, W. and Ganesan, S. and Garcia-Rios, A. and Gilardoni, S. and Glodariu, T. and Goebel, K. and Goncalves, I. F. and Gonzalez-Romero, E. and Goodacre, T. D. and Griesmayer, E. and Guerrero, C. and Gunsing, F. and Harada, H. and Heftrich, T. and Heyse, J. and Jenkins, D. G. and Jericha, E. and Johnston, K. and Kadi, Y. and Kalamara, A. and Katabuchi, T. and Kavrigin, P. and Kimura, A. and Kivel, N. and Koster, U. and Kokkoris, M. and Krticka, M. and Kurtulgil, D. and Leal-Cidoncha, E. and Lederer-Woods, C. and Leeb, H. and Lerendegui-Marco, J. and Lo Meo, S. and Lonsdale, S. J. and Losito, R. and Macina, D. and Marganiec, J. and Marsh, B. and Martinez, T. and Masi, A. and Massimi, C. and Mastinu, P. and Matteucci, F. and Mazzone, A. and Mendoza, E. and Milazzo, P. M. and Mingrone, F. and Mirea, M. and Musumarra, A. and Negret, A. and Nolte, R. and Oprea, A. and Patronis, N. and Pavlik, A. and Piersanti, L. and Piscopo, M. and Plompen, A. and Porras, I. and Praena, J. and Quesada, J. M. and Radeck, D. and Rajeev, K. and Rauscher, T. and Reifarth, R. and Riego-Perez, A. and Rothe, S. and Rout, P. and Rubbia, C. and Ryan, J. and Sabate-Gilarte, M. and Saxena, A. and Schell, J. and Schillebeeckx, P. and Schmidt, S. and Sedyshev, P. and Seiffert, C. and Smith, A. G. and Sosnin, N. V. and Stamatopoulos, A. and Stora, T. and Tagliente, G. and Tain, J. L. and Tarifeno-Saldivia, A. and Tassan-Got, L. and Tsinganis, A. and Valenta, S. and Vannini, G. and Variale, V. and Vaz, P. and Ventura, A. and Vlachoudis, V. and Vlastou, R. and Wallner, A. and Warren, S. and Weigand, M. and Weiss, C. and Wolf, C. and Woods, P. J. and Wright, T. and Zugec, P.. (2018) Be-7 (n,p)Li-7 Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN. Physical Review Letters, 121 (4). 042701.

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We report on the measurement of the Be-7(n,p)Li-7 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. The only two previous time-of-flight measurements performed on this reaction did not cover the energy window of interest for BBN, and they showed a large discrepancy between each other. The measurement was performed with a Si telescope and a high-purity sample produced by implantation of a Be-7 ion beam at the ISOLDE facility at CERN. While a significantly higher cross section is found at low energy, relative to current evaluations, in the region of BBN interest, the present results are consistent with the values inferred from the time-reversal Li-7(p,n)Be-7 reaction, thus yielding only a relatively minor improvement on the so-called cosmological lithium problem. The relevance of these results on the near-threshold neutron production in the p + Li-7 reaction is also discussed.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:13 Aug 2018 11:14
Deposited On:13 Aug 2018 11:14

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