Author/Authors :
F. Cappuzzello، نويسنده , , A. Cunsolo، نويسنده , , Gary S. Fortier ، نويسنده , , A. Foti، نويسنده , , M. Khaled، نويسنده , , H. Laurent، نويسنده , , H. Lenske، نويسنده , , J.M Maison، نويسنده , , A.L. Melita، نويسنده , , C. Nociforo، نويسنده , , L. Rosier، نويسنده , , C. Stephan، نويسنده , , L. Tassan-Got، نويسنده , , J.S. Winfield، نويسنده , , H.H. Wolter، نويسنده ,
Abstract :
The 11B(7Li,7Be)11Be reaction at 57 MeV incident energy was studied at forward angles in order to explore the 11Be excitation energy spectrum. The 11Be ground state and the states at E∗=0.32,1.77,2.67,3.41,3.89,3.96,6.05 MeV excitation energies were populated. The state at 6.05 MeV (FWHM 320±40 keV) has not been previously observed. The good energy resolution (∼50 keV) allowed the identification of these transitions each for 7Be in its ground and first excited state at E∗=0.429 MeV. QRPA calculations reproduce the 11Be level structure below 2 MeV of excitation energy. The strength observed at higher excitation energies is very likely produced mainly by core-excited components of 11Be.
