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Halo excitations in fragmentation of He-6 at 240 MeV/u on carbon and lead targets

D. Aleksandrov ; T. Aumann ; Leif Axelsson (Institutionen för experimentell fysik, Subatomär fysik) ; 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 ; A. Grunschloss ; M. Hellstrom ; J. Holeczek ; R. Holzmann ; Björn Jonson (Institutionen för experimentell fysik, Subatomär fysik) ; J. V. Kratz ; G. Kraus ; R. Kulessa ; Y. Leifels ; A. Leistenschneider ; T. Leth ; Karin Markenroth (Institutionen för experimentell fysik, Subatomär fysik) ; Mikael Meister (Institutionen för experimentell fysik, Subatomär fysik) ; I. Mukha ; G. Munzenberg ; F. Nickel ; Thomas Nilsson ; Göran Nyman (Institutionen för experimentell fysik, Subatomär fysik) ; B. Petersen ; M. Pfutzner ; V. Pribora ; A. Richter ; K. Riisager ; C. Scheidenberger ; G. Schrieder ; W. Schwab ; H. Simon ; Martin Smedberg (Institutionen för experimentell fysik, Subatomär fysik) ; J. Stroth ; A. Surowiec ; O. Tengblad ; Mikhail V. Zhukov (Institutionen för experimentell fysik, Subatomär fysik)
Nuclear Physics A (0375-9474). Vol. 669 (2000), 1-2, p. 51-64.
[Artikel, refereegranskad vetenskaplig]

Dissociation of a 240 MeV/u beam of He-6, incident on carbon and lead targets, has been studied in kinematically complete experiments to investigate low-lying excitation modes in the halo nucleus He-6. It is shown that alignment effects characterize the inelastic scattering and allow an unambiguous assignment of the spin of a narrow resonance observed in the excitation energy spectrum. The differential cross sections for the He-6 inelastic scattering on carbon and lead targets were deduced from the measured moments of the two neutrons and the a-particle. An analysis of these distributions shows that quadrupole and, possibly, monopole excitations characterize the hadronic interaction, while the dipole mode is dominating in Coulomb dissociation. Neither theoretically predicted new resonance states in He-6 nor nuclear excitation of a dipole mode were found. Direct evidence has been obtained for strong suppression of Coulornb post-acceleration in direct Coulomb breakup in a lead target.

Nyckelord: inelastic-scattering, nuclei, li-11, breakup, states, resonances, spectrum, model, be-11, c-12

Denna post skapades 2010-10-21. Senast ändrad 2014-09-02.
CPL Pubid: 127922


Institutioner (Chalmers)

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



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