Core-breakup reactions of the halo nuclei Be-11 and Li-11: momentum distributions and shadow effects
Artikel i vetenskaplig tidskrift, 1999

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.

UP REACTIONS

widths

ONE-NEUTRON HALO

HE-6

REMOVAL

halo nuclei

radioactive beams

STRIPPING REACTIONS

core-breakup reactions

momentum

shadowing

Författare

S. Grevy

L. Axelsson

J. C. Angelique

R. Anne

D. Guillemaud-Mueller

P. G. Hansen

P. Hornshoj

Björn Jonson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

M. Lewitowicz

A. C. Mueller

Thomas Nilsson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

Göran Hugo Nyman

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

N. A. Orr

F. Pougheon

K. Riisager

M. G. Saint-Laurent

Martin Smedberg

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

O. Sorlin

Nuclear Physics A

0375-9474 (ISSN)

Vol. 650 47-61

Ämneskategorier

Subatomär fysik

DOI

10.1016/S0375-9474(99)00102-5