Three-body correlations in electromagnetic dissociation of Borromean nuclei: The He-6 case
Artikel i vetenskaplig tidskrift, 2005

Dissociation of He-6 on a lead target has been studied at 240 MeV/u. The four-momenta of the two neutrons in coincidence with alpha-particles have been measured and used to reconstruct the three-body energy and angular correlations in the final state. For the first time, three-body correlations were included in the analysis of the He-6 dissociation data, and compared with calculations assuming a dipole mode for the electromagnetic dissociation. In addition, the experimental data have been analyzed using a series expansion of the final transition amplitude into hyperspherical functions, showing the importance of both nn and alpha n final-state interactions. It is shown that the dissociation process is governed by a transition of one neutron from the p-shell in the 6He ground state to the s-shell in the continuum further indicating that the role of the transition through an intermediate He-5(3/2(-)) state is more important than expected. (c) 2005 Elsevier B.V. All rights reserved.

EXCITATIONS

particle correlations

He-6

RESONANCE

GENERAL-ORDER COLLISIONS

Coulomb excitation

unstable nuclei

FRAGMENTATION

TERTIARY

HALO NUCLEI

Författare

L. V. Chulkov

H. Simon

I. J. Thompson

T. Aumann

M. J. G. Borge

T. W. Elze

H. Emling

H. Geissel

L. V. Grigorenko

M. Hellstrom

Björn Jonson

Chalmers, Teknisk fysik, Subatomär fysik

J. W. V. Kratz

R. Kulessa

K. Markenroth

G. Munzenberg

F. Nickel

Thomas Nilsson

Chalmers, Teknisk fysik, Subatomär fysik

Göran Hugo Nyman

Chalmers, Teknisk fysik, Subatomär fysik

V. Pribora

A. Richter

K. Riisager

C. Scheidenberger

G. Schrieder

O. Tengblad

Mikhail Zhukov

Chalmers, Teknisk fysik, Subatomär fysik

Nuclear Physics A

0375-9474 (ISSN)

Vol. 759 23-42

Ämneskategorier

Subatomär fysik

DOI

10.1016/j.nuclphysa.2005.05.001