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

Summary, in English

Dissociation of 6He on a lead target has been studied at 240 MeV/u. The four-momenta of the two neutrons in coincidence with greek small letter 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 6He 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 greek small letter alphan 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 5He(3/2−) state is more important than expected.

• Author: L V Chulkov; H Simon; I J Thompson; T Aumann; M J G Borge; T W Elze; H Emling; H Geissel; L V Grigorenko; Margareta Hellström; B Jonson; J W V Kratz; R Kulessa; Karin Markenroth Bloch; M Meister; G Munzenberg; F Nickel; T Nilsson; G Nyman; V Pribora; A Richter; K Riisager; C Scheidenberger; G Schrieder; O Tengblad; M V Zhukov
• Publishing year: 2005
• Language: English
• Pages: 23-42
• Publication/Series: Nuclear Physics, Section A
• Volume: 759
• Issue: 1-2
• Links: http://dx.doi.org/10.1016/j.nuclphysa.2005.05.001
• Document type: Journal article
• Publisher: Elsevier
• Keywords: 6He; Unstable nuclei; Coulomb excitation; Particle correlations
• Status: Published
• ISBN/ISSN/Other: ISSN: 0375-9474