Invariant mass spectrum and alpha-n correlation function studied in the fragmentation of He-6 on a carbon target
Artikel i vetenskaplig tidskrift, 1998

Momentum distributions and invariant mass spectra from the breakup of He-6 ions with an energy of 240 MeV/u interacting with a carbon target have been studied. The data were used to extract information about the reaction mechanism which is influenced by the structure of He-6. It is found that the dominant reaction mechanism is a two-step process: knock out of one neutron followed by the decay of the He-5 resonance. The shape of the (alpha+n) two-body invariant mass spectrum is interpreted as mainly reflecting the 5He ground state which is a J(pi) = 3/2(-) resonance. However, no evidence for correlations between cu particles and neutrons is observed in the momentum widths of the distributions. It is demonstrated that a combined analysis of the two-body invariant mass spectrum and an appropriate correlation function may be used to determine the properties of the intermediate resonance. (C) 1998 Elsevier Science B.V.

Halo nuclei

mechanism

secondary radioactive beams

breakup reactions

momentum distributions

exotic nuclei

MOMENTUM DISTRIBUTIONS

invariant mass spectra

fragmentation

ENERGY

He-5

He-6

Författare

D. Aleksandrov

T. Aumann

L. Axelsson

T. Baumann

M. J. G. Borge

L. V. Chulkov

J. Cub

W. Dostal

B. Eberlein

T. W. Elze

H. Emling

H. Geissel

V. Z. Goldberg

M. Golovkov

A. Grunschloss

M. Hellstrom

J. Holeczek

R. Holzmann

Björn Jonson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

A. A. Korshenninikov

J. V. Kratz

G. Kraus

R. Kulessa

Y. Leifels

A. Leistenschneider

T. Leth

I. Mukha

G. Munzenberg

F. Nickel

Thomas Nilsson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

Göran Hugo Nyman

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

B. Petersen

M. Pfutzner

A. Richter

K. Riisager

C. Scheidenberger

G. Schrieder

W. Schwab

H. Simon

Martin Smedberg

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

M. Steiner

J. Stroth

A. Surowiec

T. Suzuki

O. O. Tengblad

Mikhail Zhukov

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

Nuclear Physics A

0375-9474 (ISSN)

Vol. 633 2 234-246

Ämneskategorier

Subatomär fysik

DOI

10.1016/S0375-9474(98)00120-1