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

AuthorsMarkenroth, K.; Meister, M.; Eberlein, B.; Aleksandrov, D.; Aumann, T.; Axelsson, L.; Baumann, T.; García Borge, María José ; Chulkov, L. V.; Dostal, W.; Elze, Th. W.; Emling, H.; Geissel, H.; Grünschloß, A.; Hellström, M.; Holeczek, J.; Jonson, B.; Kratz, J. V.; Kulessa, R.; Leistenschneider, A.; Mukha, I. ; Münzenberg, G.; Nickel, F.; Nilsson, T.; Nyman, G.; Pfützner, M.; Pribora, V.; Richter, Achim W.; Riisager, K.; Scheidenberger, C.; Schrieder, G.; Simon, H.; Stroth, J.; Tengblad, Olof ; Zhukov, M. V.
Keywords[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19
[PACS] Polarization phenomena in reactions
Issue Date1-Jan-2001
CitationNuclear Physics A 679(3-4): 462–480 (2001)
AbstractDissociation 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.
Description19 pages, 3 tables, 6 figures.-- PACS nrs.: 27.20.+n; 24.70.+s; 25.06.-t.-- Available online Dec 4, 2000.
Publisher version (URL)http://dx.doi.org/10.1016/S0375-9474(00)00372-9
Appears in Collections:(CFMAC-IEM) Artículos
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