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

Chulkov, L V; Simon, H; Thompson, I J; Aumann, T; Borge, M J G; Elze, T W; Emling, H; Geissel, H; Grigorenko, L V and Hellström, Margareta LU , et al. (2005) In Nuclear Physics, Section A 759(1-2). p.23-42
Abstract
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... (More)
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. (Less)
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publishing date
type
Contribution to journal
publication status
published
keywords
6He, Unstable nuclei, Coulomb excitation, Particle correlations
in
Nuclear Physics, Section A
volume
759
issue
1-2
pages
23 - 42
publisher
Elsevier
external identifiers
  • scopus:22544434330
ISSN
0375-9474
DOI
10.1016/j.nuclphysa.2005.05.001
language
English
LU publication?
no
id
a5502f96-c943-477f-bf1d-bb9ea0c844f1 (old id 1133231)
date added to LUP
2008-06-25 09:25:10
date last changed
2017-10-08 04:17:25
@article{a5502f96-c943-477f-bf1d-bb9ea0c844f1,
  abstract     = {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       = {Chulkov, L V and Simon, H and Thompson, I J and Aumann, T and Borge, M J G and Elze, T W and Emling, H and Geissel, H and Grigorenko, L V and Hellström, Margareta and Jonson, B and Kratz, J W V and Kulessa, R and Markenroth Bloch, Karin and Meister, M and Munzenberg, G and Nickel, F and Nilsson, T and Nyman, G and Pribora, V and Richter, A and Riisager, K and Scheidenberger, C and Schrieder, G and Tengblad, O and Zhukov, M V},
  issn         = {0375-9474},
  keyword      = {6He,Unstable nuclei,Coulomb excitation,Particle correlations},
  language     = {eng},
  number       = {1-2},
  pages        = {23--42},
  publisher    = {Elsevier},
  series       = {Nuclear Physics, Section A},
  title        = {Three-body correlations in electromagnetic dissociation of Borromean nuclei: The He-6 case},
  url          = {http://dx.doi.org/10.1016/j.nuclphysa.2005.05.001},
  volume       = {759},
  year         = {2005},
}