Experimental setup and procedure for the measurement of the Be-7(n,alpha)alpha reaction at n_TOF

L. Cosentino, A. Musumarra, M. Barbagallo, A. Pappalardo, N. Colonna, L. Damone, M. Piscopo, P. Finocchiaro, E. Maugeri, S. Heinitz, D. Schumann, R. Dressler, N. Kivel, O. Aberle, J. Andrzejewski, L. Audouin, M. Ayranov, M. Bacak, S. Barros, J. Balibrea-Correa, V. Becares, F. Becvar, C. Beinrucker, E. Berthoumieux, J. Billowes, D. Bosnar, M. Brugger, M. Caamano, M. Calviani, F. Calvino, D. Cano-Ott, R. Cardella, A. Casanovas, D. M. Castelluccio, F. Cerutti, Y. H. Chen, E. Chiaveri, G. Cortes, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, E. Dupont, I. Duran, B. Fernandez-Dominguez, A. Ferrari, P. Ferreira, W. Furman, S. Ganesan, A. Garcia-Rios, A. Gawlik, I. Gheorghe, T. Glodariu, K. Goebel, I. F. Goncalves, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, H. Harada, T. Heftrich, J. Heyse, D. G. Jenkins, E. Jericho, F. Kaeppeler, T. Katabuchi, P. Kavrigin, A. Kimura, M. Kokkoris, M. Krticka, E. Leal-Cidoncha, J. Lerendegui, C. Lederer, H. Leeb, S. Lo Meo, S. Lonsdale, R. Losito, D. Macina, J. Marganiec, T. Martinez, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, S. Montesano, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, J. Praena, J. Quesada, K. Rajeev, T. Rauscher, R. Reifarth, A. Riego-Perez, P. Rout, C. Rubbia, J. Ryan, M. Sabate-Gilarte, A. Saxena, P. Schillebeeckx, S. Schmidt, P. Sedyshev, A. G. Smith, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeno-Saldivia, L. Tassan-Got, A. Tsinganis, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, J. Vollaire, A. Wallner, S. Warren, M. Weigand, C. Weiss, C. Wolf, P. J. Woods, T. Wright, P. Zugec

The newly built second experimental area EAR2 of then 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 Be-7(n,alpha)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.The apparently unsurmountable experimental difficulties stemming from the huge Be-7 gamma-activity, along with the lack of a suitable neutron beam facility, had so far prevented further measurements. The detection system is subject to considerable radiation damage, but is capable of disentangling the rare reaction signals from the very high background. This newly developed setup could likely be useful also to study other challenging reactions requiring the detectors to be installed directly in the neutron beam.

Externe Organisation(en)
Università degli Studi di Catania, York University, Istituto Nazionale di Fisica Nucleare, Roma, Paul Scherrer Institute, European Organization for Nuclear Research (CERN), University of Lodz, DG Energy, European Commiss, Technische Universität Wien, Universidade de Lisboa, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Charles University Prague, Johann Wolfgang Goethe-Universität Frankfurt am Main, French Atomic Energy Commission (CEA), University of Manchester, University of Zagreb, Universidade de Santiago de Compostela (USC), Universitat Politècnica de Catalunya, Università degli Studi di Salerno, Universidad de Sevilla, Instituto de Física Corpuscular (IFIC), Joint Institute for Nuclear Research, Bhabha Atom Res Ctr BARC, Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN HH), Japan Atomic Energy Agency, European Commission, Joint Research Centre, Karlsruher Institut für Technologie, Tokyo Institute of Technology (TIT), National Technical University of Athens (NTUA), University of Edinburgh, Università degli Studi di Bologna, CNR, Consiglio Nazionale delle Ricerche (CNR), Inst Crystallog, Physikalisch-Technische Bundesanstalt (PTB), University of Ioannina, Universidad de Granada, University of Hertfordshire, Universität Basel, Australian National University, University of York, Université Paris-Saclay
Nuclear Instruments & Methods in Physics Research. Section A. Accelerators, Spectrometers, Detectors, and Associated Equipment
Anzahl der Seiten
ÖFOS 2012
103014 Kernphysik
Link zum Portal