Invariant-mass spectroscopy of Li-10 and Li-11
Artikel i vetenskaplig tidskrift, 1997

Break-up of secondary Li-11 ion beams (280 MeV/nucleon) on C and Pb targets into Li-9 and neutrons is studied experimentally. Cross sections and neutron multiplicity distributions are obtained, characterizing different reaction mechanisms. Invariant-mass spectroscopy for Li-11 and Li-10 is performed. The E1 strength distribution, deduced from electromagnetic excitation of Li-11 up to an excitation energy of 4 MeV comprises similar to 8% of the Thomas-Reiche-Kuhn energy-weighted sumrule strength. Two low-lying resonance-like structures are observed for Li-10 at decay energies of 0.21(5) and 0.62(10) MeV, the former one carrying 26(10)% of the strength and likely to be associated with an s-wave neutron decay. A strong di-neutron correlation in Li-11 can be discarded. Calculations in a quasi-particle RPA approach are compared with the experimental results for Li-10 and Li-11. (C) 1997 Elsevier Science B.V.

Li-10 deduced resonances

NEUTRONS

E=280 MeV/nucleon

INTERACTION CROSS-SECTIONS

Pb(Li-11

BEAMS

breakup sigma

MOMENTUM DISTRIBUTIONS

features

multiplicity

measured neutron

Li-11

NUCLEAR RADII

gamma-decay associated sum-rule strengths

decay

BREAK-UP

ELECTROMAGNETIC DISSOCIATION

NUCLEAR REACTIONS C

chi n)

EXCITATION

FRAGMENTATION

STATES

Författare

M. Zinser

F. Humbert

Thomas Nilsson

Institutionen för fysik

W. Schwab

H. Simon

T. Aumann

M. J. G. Borge

L. V. Chulkov

J. Cub

T. W. Elze

H. Emling

H. Geissel

D. GuillemaudMueller

P. G. Hansen

R. Holzmann

H. Irnich

Björn Jonson

Institutionen för fysik

J. V. Kratz

R. Kulessa

Y. Leifels

H. Lenske

A. Magel

A. C. Mueller

G. Munzenberg

F. Nickel

Göran Hugo Nyman

Institutionen för fysik

A. Richter

K. Riisager

C. Scheidenberger

G. Schrieder

K. Stelzer

J. Stroth

A. Surowiec

Olof Tengblad

E. Wajda

E. Zude

Nuclear Physics A

0375-9474 (ISSN)

Vol. 619 151-176

Ämneskategorier

Subatomär fysik

DOI

10.1016/S0375-9474(97)00134-6