Europhys. Lett.
Volume 65, Number 6, March 2004
Page(s) 766 - 772
Section Nuclear physics
Published online 01 March 2004
Europhys. Lett., 65 (6) , pp. 766-772 (2004)
DOI: 10.1209/epl/i2003-10197-8

Excited states of $\chem{{}^{15}C}$

F. Cappuzzello1, S. E. A. Orrigo1, 2, A. Cunsolo1, 2, H. Lenske3, M. C. Allia1, 2, D. Beaumel4, S. Fortier4, A. Foti2, 5, A. Lazzaro1, 2, C. Nociforo1 and J. S. Winfield1

1  INFN, Laboratori Nazionali del Sud - Via S. Sofia 62, 95123 Catania, Italy
2  Dipartimento di Fisica e Astronomia, Università di Catania Via S. Sofia 64, 95123 Catania, Italy
3  Institut für Theoretische Physik, Universität Giessen Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
4  Institut de Physique Nucléaire, IN2P3-CNRS - 91406 Orsay Cedex, France
5  INFN, Sezione di Catania - Corso Italia 57, 95129 Catania, Italy

(Received 27 November 2003; accepted 5 January 2004)

The $\chem{{}^{15}N({}^7Li,{}^7Be){}^{15}C}$ reaction at 55 $\un{MeV}$ incident energy was studied at forward angles in order to explore the $\chem{{}^{15}C}$ excitation energy spectrum. The $\chem{{}^{15}C}$ ground state and the states at $E_{\ab{x}}=0.77$, 6.77, 7.30, 8.50 $\un{MeV}$ excitation energies were populated. The energy resolution ( $\sim 250$ $\un{keV}$) allowed the identification of these transitions each for $\chem{{}^7Be}$ ground and first-excited state at $E_{\ab{x}}=0.429$ $\un{MeV}$. QRPA calculations reproduce the $\chem{{}^{15}C}$ level structure below 1.5 $\un{MeV}$ excitation energy. The strength observed at higher excitation energies probably arises from core-excited components of $\chem{{}^{15}C}$.

21.10.-k - Properties of nuclei; nuclear energy levels.
25.70.Kk - Charge-exchange reactions.
27.20.+n - Properties of specific nuclei listed by mass ranges: $6\leq A\leq 19$.

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