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

L. V. Chulkov ; H. Simon ; I. J. Thompson ; T. Aumann ; M. J. G. Borge ; T. W. Elze ; H. Emling ; H. Geissel ; L. V. Grigorenko ; M. Hellstrom ; Björn Jonson (Institutionen för fundamental fysik, Subatomär fysik) ; J. W. V. Kratz ; R. Kulessa ; K. Markenroth ; Mikael Meister ; G. Munzenberg ; F. Nickel ; Thomas Nilsson (Institutionen för fundamental fysik, Subatomär fysik) ; Göran Nyman (Institutionen för fundamental fysik, Subatomär fysik) ; V. Pribora ; A. Richter ; K. Riisager ; C. Scheidenberger ; G. Schrieder ; O. Tengblad ; Mikhail V. Zhukov (Institutionen för fundamental fysik, Subatomär fysik)
Nuclear Physics A (0375-9474). Vol. 759 (2005), 1-2, p. 23-42.
[Artikel, refereegranskad vetenskaplig]

Dissociation 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. (c) 2005 Elsevier B.V. All rights reserved.

Nyckelord: He-6, unstable nuclei, Coulomb excitation, particle correlations, GENERAL-ORDER COLLISIONS, HALO NUCLEI, FRAGMENTATION, EXCITATIONS, RESONANCE, TERTIARY

Denna post skapades 2006-09-12. Senast ändrad 2014-09-02.
CPL Pubid: 11479


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Institutionen för fundamental fysik, Subatomär fysik (2005-2013)



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