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

Karin Markenroth (Institutionen för experimentell fysik, Subatomär fysik) ; Mikael Meister (Institutionen för experimentell fysik, Subatomär fysik) ; B. Eberlein ; D. Aleksandrov ; T. Aumann ; Leif Axelsson (Institutionen för experimentell fysik, Subatomär fysik) ; T. Baumann ; M. J. G. Borge ; L. V. Chulkov ; W. Dostal ; T. W. Elze ; H. Emling ; H. Geissel ; A. Grunschloss ; M. Hellstrom ; J. Holeczek ; Björn Jonson (Institutionen för experimentell fysik, Subatomär fysik) ; J. V. Kratz ; R. Kulessa ; A. Leistenschneider ; I. Mukha ; G. Munzenberg ; F. Nickel ; Thomas Nilsson ; Göran Nyman (Institutionen för experimentell fysik, Subatomär fysik) ; M. Pfutzner ; V. Pribora ; A. Richter ; K. Riisager ; C. Scheidenberger ; G. Schrieder ; H. Simon ; J. Stroth ; O. Tengblad ; Mikhail V. Zhukov (Institutionen för experimentell fysik, Subatomär fysik)
Nuclear Physics A (0375-9474). Vol. 679 (2001), 3-4, p. 462-480.
[Artikel, refereegranskad vetenskaplig]

Dissociation of 227 MeV/u He-8 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 (He-6 + n) as well as diffractive dissociation and inelastic scattering into the (He-6 + 2n) channel. The data are compared with corresponding results from the well-known halo nucleus He-6. In both cases it is found that neutron knock-out is the: dominating reaction channel. The relative energy spectrum (He-6 + n) shows a structure, which is interpreted as being due to the I-pi = 3/2(-) resonance in the He-7 ground state with about equal contribution from its I-pi = 1/2(-) spin-orbit partner. The He-7 resonance shows a spin alignment similar to that observed in He-5, but with a smaller anisotropy indicating that the structure of the He-8 ground state is more complicated than that of He-6. The data in the (He-6 + 2n) channel were used to identify resonances in the excitation energy spectrum of He-8. If the spectrum is interpreted as two overlapping resonances, the spin-parity assignment for these is found to be 2(+) and 1(-), respectively.

Nyckelord: interaction cross-sections, orbital shell-model, he-isotopes, momentum distributions, inelastic-scattering, light-nuclei, halo nuclei, states, parameters, isospin

Denna post skapades 2010-10-21. Senast ändrad 2014-09-02.
CPL Pubid: 127916


Institutioner (Chalmers)

Institutionen för experimentell fysik, Subatomär fysik (1900-2005)



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