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Title Three-body correlations in electromagnetic dissociation of Borromean nuclei: The 6 He case
Author(s) Chulkov, L V (Darmstadt, GSI ; Kurchatov Inst., Moscow) ; Simon, H (Darmstadt, GSI) ; Thompson, I J (Surrey U.) ; Aumann, T (Darmstadt, GSI ; Mainz U., Inst. Kernphys.) ; Borge, M J G (Madrid, Inst. Estructura Materia) ; Elze, Th W (Frankfurt U., Inst. Kernphys.) ; Emling, H (Darmstadt, GSI) ; Geissel, H (Darmstadt, GSI) ; Grigorenko, L V (Darmstadt, GSI ; Kurchatov Inst., Moscow) ; Hellström, M (Darmstadt, GSI) Показать всех 26 авторов
Publication 2005
Number of pages 20
In: Nucl. Phys. A 759 (2005) 23-42
DOI 10.1016/j.nuclphysa.2005.05.001
Subject category Nuclear Physics - Experiment
Abstract Dissociation of 6 He on a lead target has been studied at 240 MeV/u. The four-momenta of the two neutrons in coincidence with α -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 6 He 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 αn final-state interactions. It is shown that the dissociation process is governed by a transition of one neutron from the p -shell in the 6 He ground state to the s -shell in the continuum further indicating that the role of the transition through an intermediate 5 He( 3 / 2 − ) state is more important than expected.
Copyright/License Elsevier B.V.

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