Exclusive and Restricted-Inclusive Reactions Involving the Be-11 One-Neutron Halo

• Reactions of a 41 MeV/u beam of the radioactive halo nucleus Be-11 have been studied with a counter telescope coupled to an array of neutron detectors covering angles up to 97-degrees. The technique allows to determine single-neutron inclusive and exclusive angular distributions. The targets (Be, Ti and Au) were chosen to illustrate the relative roles played by nuclear and Coulomb mechanisms. The channels leading to Be-10, the dissociation channels, correspond to impact parameters larger than the sum of the radii of the target and the Be-10 core. It is shown that for the dissociation process it is possible to account almost quantitatively for the integral, single- and double-differential cross sections from models without free parameters including the Coulomb, Serber and Glauber (diffraction-dissociation) mechanisms. The neutron distributions from the nondissociative reaction channels show little individuality and it is convenient to group them together as the channel ''neutron plus anything different from Be-10''. We refer to these as ''restricted-inclusive'' reactions. These seem to be a promising tool for obtaining accurate information on the halo wave function in momentum coordinates.

Subject headings

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Keyword

X)

RICH NUCLEI

BE-9

ANALYSIS IN TERMS OF COULOMB

BREAK-UP

INTEGRAL SIGMA(BE-10) FOLLOWING

EXCITATION

DISSOCIATION CROSS-SECTION

TI

DOUBLE-DIFFERENTIAL

HEAVY-IONS

PROJECTILE FRAGMENTATION

LI-11 PROJECTILES

DIFFRACTIVE MECHANISMS

E(N)) NEAR 0-DEGREES

E=41 MEV/NUCLEON

EXCLUSIVE SIGMA(UPSILON(N)) UP TO 97-DEGREES

SIGMA(UPSILON

SERBER AND

AU-197 (BE-11

COULOMB DISSOCIATION

ASTROPHYSICAL INTEREST

PROJECTILE BREAKUP

MEASURED INCLUSIVE

LIGHT-NUCLEI

Publication and Content Type

art (subject category)

ref (subject category)