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Título : Invariant-mass spectroscopy of Li-10 and Li-11
Autor : Zinser, M., Humbert, F., Nilsson, T., Schwab, W., Simon, H., Aumann, T., García Borge, María José, Chulkov, L. V., Cub, J., Elze, Th. W., Emling, H., Geissel, H., Guillemaud-Mueller, D., Holzmann, R., Irnich, H., Jonson, B., Kratz, J. V., Kulessa, R., Leifels, Y., Lenske, H., Magel, A., Mueller, A. C., Münzenberg, G., Nickel, F., Nyman, G., Richter, Achim W., Riisager, K., Scheidenberger, C., Schrieder, G., Stelzer, K., Stroth, J., Surowiec, A., Tengblad, Olof, Wajda, E., Zude, E.
Palabras clave : Nuclear Reactions C, Pb(Li-11,xn), E=280 MeV/nucleon
Measured neutron multiplicity
Breakup σ
Li-11, Li-10 deduced resonances
Decay features
γ-decay associated sum-rule strengths
[PACS] Projectile and target fragmentation
[PACS] Coulomb excitation
[PACS] Properties of specific nuclei listed by mass ranges:6 ≤ A ≤ 19
Fecha de publicación : 16-Jun-1997
Editor: Elsevier
Citación : Nuclear Physics A 619(1-2): 151-176 (1997)
Resumen: Break-up of secondary Li-11 ion beams (280 MeV/nucleon) on C and Pb targets into Li-9 and neutrons is studied experimentally. Cross sections and neutron multiplicity distributions are obtained, characterizing different reaction mechanisms. Invariant-mass spectroscopy for Li-11 and Li-10 is performed. The E1 strength distribution, deduced from electromagnetic excitation of Li-11 up to an excitation energy of 4 MeV comprises ~8% of the Thomas-Reiche-Kuhn energy-weighted sumrule strength. Two low-lying resonance-like structures are observed for Li-10 at decay energies of 0.21(5) and 0.62(10) MeV, the former one carrying 26(10)% of the strength and likely to be associated with an s-wave neutron decay. A strong di-neutron correlation in Li-11 can be discarded. Calculations in a quasi-particle RPA approach are compared with the experimental results for Li-10 and Li-11.
Descripción : 26 pages, 5 tables, 10 figures.-- PACS nrs.: 25.60.+v; 27.20.+n; 25.70.Mn; 25.70.De.
Versión del editor:
ISSN: 0375-9474
DOI: 10.1016/S0375-9474(97)00134-6
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