On the beta-decay of C-9
Artikel i vetenskaplig tidskrift, 2001

In beta -decay experiments on C-9 at CERN/ISOLDE the beta -strength was determined to the ground state, the 12.2 MeV excited state and the Isobaric Analog State (IAS) at 14.655 MeV in B-9. A large beta -strength asymmetry is deduced for the mirror transitions of C-9 and Li-9 to states around 12 MeV excitation energy. A satisfactory description of the three-body decay from a narrow energy region around the 12.2 MeV resonance is obtained within a sequential model involving the ground and first-excited states of Li-5 and Be-8. From the study of angular correlations the spin of the 12.2 MeV state is determined as 5/2(-). For the first time the population of the IAS is observed in beta -decay and new information on the decay of this state is obtained. The advantages of a closely packed. highly segmented detector setup are demonstrated. (C) 2001 Elsevier Science B.V. All rights reserved.

SHELL-MODEL

measured beta-delayed E-p

double-sided silicon strip detectors

EMISSION

X)]

STATES

DELAYED PROTON

p

NUCLEAR SYSTEM

Ca(p

mass-separated source

angular correlations

A=9 beta-decay asymmetry.

LIGHT-NUCLEI

CONTINUUM

LI-9

strengths

B-9 deduced beta-branching

decay mechanism features

alpha alpha-coin.

E alpha

ASYMMETRY

C-9(beta(+)) [from O

DRIP-LINE

Författare

U. C. Bergmann

M. J. G. Borge

R. Boutami

L. M. Fraile

H. O. U. Fynbo

P. Hornshoj

Björn Jonson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

Karin Markenroth

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

I. Martel

I. Mukha

Thomas Nilsson

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

Göran Hugo Nyman

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

A. Oberstedt

Y. P. Alonso

K. Riisager

H. Simon

O. Tengblad

Fredrik Wenander

Katarina Wilhelmsen Rolander

Chalmers, Institutionen för experimentell fysik, Subatomär fysik

Nuclear Physics A

0375-9474 (ISSN)

Vol. 692 3-4 427-450

Ämneskategorier

Subatomär fysik

DOI

10.1016/S0375-9474(01)00650-9