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8He-6He: a comparative study of nuclear fragmentation reactions

Markenroth Bloch, Karin LU ; Meister, M.; Eberlein, Börn; Aleksandrov, D.; Aumann, T.; Axelsson, L.; Baumann, T.; Borge, M.J.G.; Chulkov, L.V. and Dostal, W., et al. (2001) In Nuclear Physics, Section A 679(3-4). p.462-480
Abstract
Dissociation of 227 MeV/u 8He in a carbon target has been studied in kinematically complete experiments. The data include the relative energy spectrum, angular distributions in the neutron knock-out channel (6He+n) as well as diffractive dissociation and inelastic scattering into the (6He+2n) channel. The data are compared with corresponding results from the well-known halo nucleus 6He. In both cases it is found that neutron knock-out is the dominating reaction channel. The relative energy spectrum (6He+n) shows a structure, which is interpreted as being due to the Iπ=3/2− resonance in the 7He ground state with about equal contribution from its Iπ=1/2− spin–orbit partner.



The 7He resonance shows a spin alignment similar... (More)
Dissociation of 227 MeV/u 8He in a carbon target has been studied in kinematically complete experiments. The data include the relative energy spectrum, angular distributions in the neutron knock-out channel (6He+n) as well as diffractive dissociation and inelastic scattering into the (6He+2n) channel. The data are compared with corresponding results from the well-known halo nucleus 6He. In both cases it is found that neutron knock-out is the dominating reaction channel. The relative energy spectrum (6He+n) shows a structure, which is interpreted as being due to the Iπ=3/2− resonance in the 7He ground state with about equal contribution from its Iπ=1/2− spin–orbit partner.



The 7He resonance shows a spin alignment similar to that observed in 5He, but with a smaller anisotropy indicating that the structure of the 8He ground state is more complicated than that of 6He.



The data in the (6He+2n) channel were used to identify resonances in the excitation energy spectrum of 8He. If the spectrum is interpreted as two overlapping resonances, the spin-parity assignment for these is found to be 2+ and 1−, respectively. (Less)
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publishing date
type
Contribution to journal
publication status
published
in
Nuclear Physics, Section A
volume
679
issue
3-4
pages
462 - 480
publisher
Elsevier
external identifiers
  • scopus:0035216443
ISSN
0375-9474
DOI
10.1016/S0375-9474(00)00372-9
language
English
LU publication?
no
id
eb82bf93-5dd8-4b62-8e98-75f473c1abd6 (old id 1122125)
date added to LUP
2008-07-04 14:55:01
date last changed
2018-07-15 04:04:20
@article{eb82bf93-5dd8-4b62-8e98-75f473c1abd6,
  abstract     = {Dissociation of 227 MeV/u 8He in a carbon target has been studied in kinematically complete experiments. The data include the relative energy spectrum, angular distributions in the neutron knock-out channel (6He+n) as well as diffractive dissociation and inelastic scattering into the (6He+2n) channel. The data are compared with corresponding results from the well-known halo nucleus 6He. In both cases it is found that neutron knock-out is the dominating reaction channel. The relative energy spectrum (6He+n) shows a structure, which is interpreted as being due to the Iπ=3/2− resonance in the 7He ground state with about equal contribution from its Iπ=1/2− spin–orbit partner.<br/><br>
<br/><br>
The 7He resonance shows a spin alignment similar to that observed in 5He, but with a smaller anisotropy indicating that the structure of the 8He ground state is more complicated than that of 6He.<br/><br>
<br/><br>
The data in the (6He+2n) channel were used to identify resonances in the excitation energy spectrum of 8He. If the spectrum is interpreted as two overlapping resonances, the spin-parity assignment for these is found to be 2+ and 1−, respectively.},
  author       = {Markenroth Bloch, Karin and Meister, M. and Eberlein, Börn and Aleksandrov, D. and Aumann, T. and Axelsson, L. and Baumann, T. and Borge, M.J.G. and Chulkov, L.V. and Dostal, W. and Elze, Th. W. and Emling, H. and Geissel, H. and Grünschloß, A. and Hellström, Margareta and Holeczek, J. and Jonson, B. and Kratz, J. V. and Kulessa, R. and Leistenschneider, A. and Mukha, I. and Münzenberg, G. and Nickel, F. and Nilsson, T. and Nyman, G. and Pfützner, M. and Pribora, V. and Richter, A. and Riisager, K. and Scheidenberger, C. and Schrieder, G. and Simon, H. and Stroth, J. and Tengblad, O. and Zhukov, M. V.},
  issn         = {0375-9474},
  language     = {eng},
  number       = {3-4},
  pages        = {462--480},
  publisher    = {Elsevier},
  series       = {Nuclear Physics, Section A},
  title        = {8He-6He: a comparative study of nuclear fragmentation reactions},
  url          = {http://dx.doi.org/10.1016/S0375-9474(00)00372-9},
  volume       = {679},
  year         = {2001},
}