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

Authors:Markenroth, 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 Date:1-Jan-2001
Citation:Nuclear Physics A 679(3-4): 462–480 (2001)
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 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.
Description:19 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
ISSN:0375-9474 (Print)
1873-1554 (Online)
Appears in Collections:(CFMAC-IEM) Artículos

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