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Closed Access item Invariant-mass spectroscopy of Li-10 and Li-11

Authors: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.
Keywords: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
Issue Date:16-Jun-1997
Citation:Nuclear Physics A 619(1-2): 151-176 (1997)
Abstract: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.
Description:26 pages, 5 tables, 10 figures.-- PACS nrs.: 25.60.+v; 27.20.+n; 25.70.Mn; 25.70.De.
Publisher version (URL):http://dx.doi.org/10.1016/S0375-9474(97)00134-6
Appears in Collections:(CFMAC-IEM) Artículos

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