He-8-He-6: a comparative study of nuclear fragmentation reactions
Artikel i vetenskaplig tidskrift, 2001

Dissociation of 227 MeV/u He-8 in a carbon target has been studied in kinematically complete experiments. The data include the relative energy spectrum, angular distributions in the neutron knock-out channel (He-6 + n) as well as diffractive dissociation and inelastic scattering into the (He-6 + 2n) channel. The data are compared with corresponding results from the well-known halo nucleus He-6. In both cases it is found that neutron knock-out is the: dominating reaction channel. The relative energy spectrum (He-6 + n) shows a structure, which is interpreted as being due to the I-pi = 3/2(-) resonance in the He-7 ground state with about equal contribution from its I-pi = 1/2(-) spin-orbit partner. The He-7 resonance shows a spin alignment similar to that observed in He-5, but with a smaller anisotropy indicating that the structure of the He-8 ground state is more complicated than that of He-6. The data in the (He-6 + 2n) channel were used to identify resonances in the excitation energy spectrum of He-8. If the spectrum is interpreted as two overlapping resonances, the spin-parity assignment for these is found to be 2(+) and 1(-), respectively.

orbital shell-model

interaction cross-sections

inelastic-scattering

states

momentum distributions

parameters

halo nuclei

light-nuclei

isospin

he-isotopes

Författare

Karin Markenroth

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

Mikael Meister

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

B. Eberlein

D. Aleksandrov

T. Aumann

Leif Axelsson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

T. Baumann

M. J. G. Borge

L. V. Chulkov

W. Dostal

T. W. Elze

H. Emling

H. Geissel

A. Grunschloss

M. Hellstrom

J. Holeczek

Björn Jonson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

J. V. Kratz

R. Kulessa

A. Leistenschneider

I. Mukha

G. Munzenberg

F. Nickel

Göran Hugo Nyman

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

M. Pfutzner

V. Pribora

A. Richter

K. Riisager

C. Scheidenberger

G. Schrieder

H. Simon

J. Stroth

O. Tengblad

Mikhail Zhukov

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

Nuclear Physics A

0375-9474 (ISSN)

Vol. 679 3-4 462-480

Ämneskategorier

Subatomär fysik