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Invariant mass spectrum and alpha-n correlation function studied in the fragmentation of He-6 on a carbon target

D. Aleksandrov ; T. Aumann ; L. Axelsson ; T. Baumann ; M. J. G. Borge ; L. V. Chulkov ; J. Cub ; W. Dostal ; B. Eberlein ; T. W. Elze ; H. Emling ; H. Geissel ; V. Z. Goldberg ; M. Golovkov ; A. Grunschloss ; M. Hellstrom ; J. Holeczek ; R. Holzmann ; Björn Jonson (Institutionen för experimentell fysik, Subatomär fysik) ; A. A. Korshenninikov ; J. V. Kratz ; G. Kraus ; R. Kulessa ; Y. Leifels ; A. Leistenschneider ; T. Leth ; I. Mukha ; G. Munzenberg ; F. Nickel ; Thomas Nilsson (Institutionen för experimentell fysik, Subatomär fysik) ; Göran Nyman (Institutionen för experimentell fysik, Subatomär fysik) ; B. Petersen ; M. Pfutzner ; A. Richter ; K. Riisager ; C. Scheidenberger ; G. Schrieder ; W. Schwab ; H. Simon ; Martin Smedberg (Institutionen för experimentell fysik, Subatomär fysik) ; M. Steiner ; J. Stroth ; A. Surowiec ; T. Suzuki ; O. O. Tengblad ; Mikhail V. Zhukov (Institutionen för experimentell fysik, Subatomär fysik)
Nuclear Physics A (0375-9474). Vol. 633 (1998), 2, p. 234-246.
[Artikel, refereegranskad vetenskaplig]

Momentum distributions and invariant mass spectra from the breakup of He-6 ions with an energy of 240 MeV/u interacting with a carbon target have been studied. The data were used to extract information about the reaction mechanism which is influenced by the structure of He-6. It is found that the dominant reaction mechanism is a two-step process: knock out of one neutron followed by the decay of the He-5 resonance. The shape of the (alpha+n) two-body invariant mass spectrum is interpreted as mainly reflecting the 5He ground state which is a J(pi) = 3/2(-) resonance. However, no evidence for correlations between cu particles and neutrons is observed in the momentum widths of the distributions. It is demonstrated that a combined analysis of the two-body invariant mass spectrum and an appropriate correlation function may be used to determine the properties of the intermediate resonance. (C) 1998 Elsevier Science B.V.

Nyckelord: secondary radioactive beams, exotic nuclei, Halo nuclei, He-6, He-5, momentum distributions, invariant mass spectra, fragmentation, mechanism, breakup reactions, MOMENTUM DISTRIBUTIONS, ENERGY

Denna post skapades 2006-08-28. Senast ändrad 2014-09-02.
CPL Pubid: 11511


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



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