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Your search keyword '"E. A. Maugeri"' showing total 3 results
Start Over Author "E. A. Maugeri" Publisher american physical society (aps)
3 results on '"E. A. Maugeri"'

1. Evidence of a Near-Threshold Resonance in B11 Relevant to the β -Delayed Proton Emission of Be11

Author

Y. Ayyad, W. Mittig, T. Tang, B. Olaizola, G. Potel, N. Rijal, N. Watwood, H. Alvarez-Pol, D. Bazin, M. Caamaño, J. Chen, M. Cortesi, B. Fernández-Domínguez, S. Giraud, P. Gueye, S. Heinitz, R. Jain, B. P. Kay, E. A. Maugeri, B. Monteagudo, F. Ndayisabye, S. N. Paneru, J. Pereira, E. Rubino, C. Santamaria, D. Schumann, J. Surbrook, L. Wagner, J. C. Zamora, and V. Zelevinsky

Subjects
General Physics and Astronomy
Published
2022

2. Measurement of the Ge70(n,γ) cross section up to 300 keV at the CERN n_TOF facility

Author

E. A. Maugeri, G. Cortes, A. Musumarra, Claudia Lederer-Woods, A. R. García, S. Warren, V. Variale, V. Bécares, C. Weiss, R. Vlastou, A. Tattersall, P. C. Rout, M. Brugger, F. Gunsing, Tanja Heftrich, P. V. Sedyshev, Cristian Massimi, P. Ferreira, Damir Bosnar, Y. Kadi, I. Knapova, M. Krtička, N. Patronis, M. A. Cortés-Giraldo, A. Riego-Perez, C. Beinrucker, D. M. Castelluccio, Alfredo Ferrari, Petar Žugec, P. Vaz, K. Göbel, M. Mirea, G. Tagliente, T. Martinez, K. Rajeev, B. Fernández-Domínguez, F. Calviño, H. Leeb, M. Bacak, G. Vannini, E. Leal-Cidoncha, Javier Praena, S. Lo Meo, I. Duran, Alberto Ventura, A. Kimura, T. Wright, Francesca Matteucci, V. Khryachkov, D. Macina, J. Perkowski, A. Gawlik, U. Battino, F. Mingrone, J. Andrzejewski, Thomas Rauscher, F. Käppeler, A. Pavlik, J. Marganiec, C. Domingo-Pardo, J. I. Porras, J. L. Tain, F. Bečvář, A. Saxena, Roberto Losito, S. Valenta, Carlos Guerrero, M. Kokkoris, Tatsuya Katabuchi, O. Aberle, C. Wolf, Mario Weigand, Mario Barbagallo, A. Casanovas, P. F. Mastinu, Marco Calviani, Carlo Rubbia, A. G. Smith, R. Dressler, E. Mendoza, S. Barros, L. Cosentino, D. Schumann, Philip Woods, Rene Reifarth, P. Kavrigin, E. Berthoumieux, N. Kivel, A. Tsinganis, Stefan Schmidt, L. Audouin, Nicola Colonna, V. Vlachoudis, E. González-Romero, J. M. Quesada, E. Chiaveri, L. Tassan-Got, E. Dupont, D. Cano-Ott, E. Griesmayer, Y. H. Chen, L. A. Damone, M. Caamaño, S. Heinitz, V. Furman, E. Jericha, V. Ketlerov, Alberto Mengoni, T. Glodariu, Paolo Finocchiaro, F. Cerutti, J. A. Ryan, D. G. Jenkins, Ariel Tarifeño-Saldivia, S. J. Lonsdale, J. Lerendegui-Marco, R. Cardella, I. F. Gonçalves, S. Montesano, A. Stamatopoulos, A. Oprea, J. Heyse, M. Mastromarco, Anton Wallner, J. Billowes, J. Balibrea, P. Schillebeeckx, Hideo Harada, M. Sabaté-Gilarte, M. Diakaki, R. Nolte, P. M. Milazzo, M. Dietz, and A. Goverdovski

Subjects
Physics, Standard solar model, Solar mass, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 01 natural sciences, 7. Clean energy, Neutron temperature, Nuclear physics, Neutron capture, 13. Climate action, Nucleosynthesis, 0103 physical sciences, Neutron cross section, Astrophysics::Solar and Stellar Astrophysics, Neutron, Nuclear Experiment, 010306 general physics, s-process
Abstract

Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weak component of the slow neutron capture processes, which occurs in massive stars. The $(n,\gamma)$ cross section on $^{70}Ge$, which is mainly produced in the s process, was measured at the neutron time-of-flight facility n_TOF at CERN. Resonance capture kernels were determined up to 40 keV neutron energy and average cross sections up to 300 keV. Stellar cross sections were calculated from $kT=5 keV$ to $kT=100 keV$ and are in very good agreement with a previous measurement by Walter and Beer (1985) and recent evaluations. Average cross sections are in agreement with Walter and Beer (1985) over most of the neutron energy range covered, while they are systematically smaller for neutron energies above 150 keV. We have calculated isotopic abundances produced in s-process environments in a 25 solar mass star for two initial metallicities (below solar and close to solar). While the low metallicity model reproduces best the solar system germanium isotopic abundances, the close to solar model shows a good global match to solar system abundances in the range of mass numbers A=60–80.

Published
2019

3. Be7(n,α)He4Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN

Author

D. Macina, Carlos Guerrero, M. Sabaté-Gilarte, Rugard Dressler, P. C. Rout, C. Rubbia, W.I. Furman, P. V. Sedyshev, Y. H. Chen, A. Kimura, L. Cosentino, Srinivasan Ganesan, M. Mastromarco, A. Tsinganis, G. Vannini, A. García-Rios, F. Mingrone, C. Lederer, Anton Wallner, Nicola Colonna, J. Andrzejewski, M. Caamaño, A. Casanovas, Mario Barbagallo, Vasilis Vlachoudis, G. Cortes, M. Krtička, P. Kavrigin, N. Patronis, A. K. Saxena, Ralf Nolte, H. Leeb, Arnaud Ferrari, Ignacio Porras, Damir Bosnar, A. Oprea, T. Martinez, Mario Weigand, A. Stamatopoulos, E. Griesmayer, J. Billowes, L. A. Damone, Hideo Harada, M. Mirea, P. Ferreira, M. A. Cortés-Giraldo, S. Montesano, D. Cano-Ott, F. Calviño, R. Cardella, J. Perkowski, J. Vollaire, E. A. Maugeri, F. Gunsing, J. Balibrea-Correa, G. Tagliente, Javier Praena, S. Lo Meo, Cristian Massimi, M. Kokkoris, O. Aberle, E. Jericha, F. Bečvář, Pierfrancesco Mastinu, T. Glodariu, Paolo Finocchiaro, M. Piscopo, M. Bacak, Dorothea Schumann, Ariel Tarifeño-Saldivia, S. J. Lonsdale, J. A. Ryan, E. Mendoza, D. G. Jenkins, E. Leal-Cidoncha, I. Duran, M. Diakaki, P. Vaz, C. Weiß, Roberto Losito, Peter Schillebeeckx, A. Gawlik, Thomas Rauscher, K. Rajeev, P. M. Milazzo, J. Marganiec, F. Cerutti, E. Chiaveri, C. Beinrucker, A. Pavlik, S. Valenta, C. Domingo-Pardo, V. Bécares, E. González-Romero, Marco Calviani, Alfio Pappalardo, A. Mengoni, A. G. Smith, Philip Woods, B. Fernández-Domínguez, F. Käppeler, M. Ayranov, J. L. Tain, M. Brugger, I. F. Gonçalves, Niko Kivel, S. Heinitz, S. Altstadt, S. Warren, V. Variale, S. Barros, Tatsuya Katabuchi, A. Ventura, Rene Reifarth, Stefan Schmidt, J. M. Quesada, L. Tassan-Got, Sergio Cristallo, A. Musumarra, Tanja Heftrich, Annamaria Mazzone, Petar Žugec, A. Riego-Perez, Kathrin Göbel, Jan Heyse, R. Vlastou, E. Berthoumieux, L. Audouin, T. J. Wright, C. Wolf, E. Dupont, J. Lerendegui, A. J. M. Plompen, and D. M. Castelluccio

Subjects
Nuclear reaction, Physics, 010308 nuclear & particles physics, General Physics and Astronomy, chemistry.chemical_element, Alpha particle, Neutron radiation, 7. Clean energy, 01 natural sciences, Neutron temperature, Nuclear physics, Big Bang nucleosynthesis, chemistry, 13. Climate action, Nucleosynthesis, 0103 physical sciences, Neutron, Lithium, Nuclear Experiment, 010306 general physics
Abstract

The energy-dependent cross section of the (7)Bed(n,alpha)He-4 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 Be-7 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 Be-7, and a specifically designed experimental setup. Coincidences between the two alpha particles have been recorded in two Si-Be-7-Si arrays placed directly in the neutron beam. The present results are consistent, at thermal neutron energy, with the only previous measurement performed in the 1960s at a nuclear reactor. The energy dependence reported here clearly indicates the inadequacy of the cross section estimates currently used in BBN calculations. Although new measurements at higher neutron energy may still be needed, the n_TOF results hint at a minor role of this reaction in BBN, leaving the long-standing cosmological lithium problem unsolved.

Published
2016

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