2018 Impact factor 2.481
Hadrons and Nuclei


Eur. Phys. J. A 12, 413-419 (2001)

Microscopic three-cluster study of the low-energy $\chem{{^9}Be}$ photodisintegration

P. Descouvemont

Physique Nucléaire Théorique et Physique Mathématique, Université Libre de Bruxelles, CP229, B-1050 Brussels, Belgium

pdesc@ulb.ac.be

(Received: 7 September 2001 / Revised version: 25 October 2001 Communicated by P. Schuck)

Abstract
The 9Be and 9B nuclei are investigated in a microscopic three-cluster model involving $\alpha + \alpha + n$ (or $\alpha + \alpha + p$) configurations. The 8Be (0+,2+)+n and 5He $(3/2^-,1/2^-)+\alpha$ (or mirror) channels are included by taking account of the unstable nature of 8Be and 5He. Spectroscopic properties of 9Be and 9B are analyzed. We show that the 5 He + $\alpha$ configurations cannot be neglected to derive accurate results. The 9Be $(\gamma,\alpha\alpha)n$ photodisintegration cross-section is shown to be mainly determined by 8Be + n channels at low energies, but 5 He + $\alpha$ channels become important beyond $E_{\gamma} \approx 4$ MeV.

PACS
25.40.Lw - Radiative capture.
24.50.+g - Direct reactions.
25.60.Bx - Elastic scattering.

© Società Italiana di Fisica, Springer-Verlag 2001