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Título

Three-body correlations in electromagnetic dissociation of Borromean nuclei: The He-6 case

Autor Chulkov, L. V.; Simon, H.; Thompson, I. J.; Aumann, T.; García Borge, María José ; Elze, Th. W.; Emling, H.; Geissel, H.; Grigorenko, L. V.; Hellström, M.; Jonson, B.; Kratz, J. W. V.; Kulessa, R.; Markenroth, K.; Meister, M.; Münzenberg, G.; Nickel, F.; Nilsson, T.; Nyman, G.; Pribora, V.; Richter, Achim W.; Riisager, K.; Scheidenberger, C.; Schrieder, G.; Tengblad, Olof ; Zhukov, M. V.
Palabras clave He-6
Unstable nuclei
Coulomb excitation
Particle correlations
[PACS] Reactions induced by unstable nuclei
[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19
[PACS] Particle correlations and fluctuations
Fecha de publicación 13-jun-2005
EditorElsevier
Citación Nuclear Physics A 759(1-2): 23–42 (2005)
ResumenDissociation of He-6 on a lead target has been studied at 240 MeV/u. The four-momenta of the two neutrons in coincidence with alpha-particles have been measured and used to reconstruct the three-body energy and angular correlations in the final state. For the first time, three-body correlations were included in the analysis of the He-6 dissociation data, and compared with calculations assuming a dipole mode for the electromagnetic dissociation. In addition, the experimental data have been analyzed using a series expansion of the final transition amplitude into hyperspherical functions, showing the importance of both nn and alpha n final-state interactions. It is shown that the dissociation process is governed by a transition of one neutron from the p-shell in the 6He ground state to the s-shell in the continuum further indicating that the role of the transition through an intermediate He-5(3/2(-)) state is more important than expected.
Descripción 20 pages, 2 tables, 9 figures, 1 appendix.-- PACS nrs.: 25.60.-t; 27.20.+n; 25.70.De; 25.75.Gz.-- Printed version published Sep 5, 2005.
Versión del editorhttp://dx.doi.org/10.1016/j.nuclphysa.2005.05.001
URI http://hdl.handle.net/10261/4361
DOI10.1016/j.nuclphysa.2005.05.001
ISSN0375-9474
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