Parts | Days | Selection | Search | Downloads | Help
HK: Fachverband Hadronen und Kerne
HK 38: Nuclear Astrophysics
HK 38.7: Talk
Tuesday, March 17, 2009, 18:30–18:45, H-ZO 60
A new and improved measurement of 8Li(4He,n)11B reaction at the EXCYT RIB facility: the cross section value at the Big-Bang temperature — •Marco La Cognata1, Rosa Alba1, Silvio Cherubini1,2, Nicola Colonna5, Luigi Cosentino1, Vincenzo Crucillà1,2, Antonio Del Zoppo1, Alessia Di Pietro1, Pierpaolo Figuera1, Marisa Gulino1,2, Livio Lamia1, Agatino Musumarra1,2, Maria Grazia Pellegriti1,4, Rosario G. Pizzone1, Sebastiana M. R. Puglia1,2, Giuseppe G. Rapisarda1,2, Claus Rolfs3, Stefano Romano1,2, Maria Letizia Sergi1,2, Claudio Spitaleri1,2, Salvatore Tudisco1, and Aurora Tumino1,2 — 1INFN-Laboratori Nazionali del Sud, Catania, Italy — 2Dipartimento di Metodologie Fisiche e Chimiche per l'Ingegneria, Università di Catania, Italy — 3Institut fur Physik mit Ionenstrahlen, Ruhr-Universitaet Bochum, Germany — 4Dipartimento di Fisica e Astronomia, Università di Catania, Italy — 5INFN-Sezione di Bari, Italy
A new neutron-inclusive measurement of the 8Li(4He,n)11B at the energies relevant for astrophysics is presented. The radioactive 8Li beam was delivered by the EXCYT facility at LNS-Catania. The cross section was determined by a low-background measurement of the time correlation between the 8Li projectile arrival to the target and the neutron capture in a threshold-less 4pi thermalization counter. This new data confirm complementary inclusive 11B measurement and are consistent with a significant population of 11B levels at high excitation energy. A large experimental discrepancy between all the inclusive and the exclusive cross section shows up.