Margareta Hellström
Researcher
Three-body correlations in electromagnetic dissociation of Borromean nuclei: The He-6 case
Author
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.
Publishing year
2005
Language
English
Pages
23-42
Publication/Series
Nuclear Physics, Section A
Volume
759
Issue
1-2
Links
Document type
Journal article
Publisher
Elsevier
Keywords
- 6He
- Unstable nuclei
- Coulomb excitation
- Particle correlations
Status
Published
ISBN/ISSN/Other
- ISSN: 0375-9474