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Core-breakup reactions of the halo nuclei Be-11 and Li-11: momentum distributions and shadow effects

S. Grevy ; L. Axelsson ; J. C. Angelique ; R. Anne ; D. Guillemaud-Mueller ; P. G. Hansen ; P. Hornshoj ; Björn Jonson (Institutionen för experimentell fysik, Subatomär fysik) ; M. Lewitowicz ; A. C. Mueller ; Thomas Nilsson (Institutionen för experimentell fysik, Subatomär fysik) ; Göran Nyman (Institutionen för experimentell fysik, Subatomär fysik) ; N. A. Orr ; F. Pougheon ; K. Riisager ; M. G. Saint-Laurent ; Martin Smedberg (Institutionen för experimentell fysik, Subatomär fysik) ; O. Sorlin
Nuclear Physics A (0375-9474). Vol. 650 (1999), 1, p. 47-61.
[Artikel, refereegranskad vetenskaplig]

The halo nuclei Be-11 and Li-11 have been studied in core-breakup reactions where the halo neutrons are expected to be released without a major distortion due to the reaction. The widths of the halo-neutron momentum distributions have been extracted in coincidence with He fragments, Gamma = 32 +/- 4 MeV/c, and Li fragments, Gamma = 42 +/- 4 MeV/c for Be-11 and with He fragments, Gamma =42+/-6 MeV/c for Li-11. The Be-11 breakup gives a very low neutron multiplicity of 0.38+/-0.09 which is a manifestation of the shadowing of the neutron in the core-breakup reaction. This value can be understood from a simple theoretical calculation, which also accounts for the observed transverse momentum widths at small angles. (C) 1999 Elsevier Science B.V.

Nyckelord: radioactive beams, halo nuclei, core-breakup reactions, momentum, widths, shadowing, ONE-NEUTRON HALO, STRIPPING REACTIONS, UP REACTIONS, REMOVAL, HE-6

Denna post skapades 2006-08-28. Senast ändrad 2014-09-02.
CPL Pubid: 11018


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



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