Eur. Phys. J. A 15, 135-138 (2002)
DOI: 10.1140/epja/i2001-10241-9

Correlated emission of three -particles in the -decay of

H.O.U. Fynbo¹, Y. Prezado², J. Äystö³, U.C. Bergmann⁴, M.J.G. Borge², P. Dendooven³, W. Huang³, J. Huikari³, H. Jeppesen⁴, P. Jones³, B. Jonson⁵, M. Meister⁵, G. Nyman⁵, M. Oinonen¹, K. Riisager⁴, O. Tengblad², I.S. Vogelius⁴, Y. Wang³, L. Weissman¹ and K.W. Rolander<sup>6

1</sup>  EP Division, CERN, CH-1211 Genève 23, Switzerland
²  Instituto Estructura de la Materia, CSIC, Serrano 113bis, E-28006 Madrid, Spain
³  Department of Physics, University of Jyväskylä, FIN-40351 Jyväskylä, Finland
⁴  Institut for Fysik og Astronomi, Aarhus Universitet, DK-8000 Aarhus C, Denmark
⁵  Experimentell Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden
⁶  Fysiska Institutionen, Stockholms Universitet, Box 6730, S-113 85 Stockholm, Sweden

hans.fynbo@cern.ch

(Received: 21 March 2002 / Published online: 31 October 2002)

Abstract
The -decay of ¹²N is used to populate -emitting excited states in ¹²C. The -particles from the break-up of both the 10.3 MeV and 12.71 MeV states were measured in coincidence with an efficient detector setup consisting of two double-sided Si strip detectors. The break-up of the 12.71 MeV 1 ⁺ state is an interesting testing ground for the different descriptions of multi-particle break-up, whereas the properties of the 10.3 MeV state, which under some astrophysical conditions is relevant for the production of ¹²C in stars, are poorly known. First results from the analysis of the data is presented and compared with Monte Carlo simulations.

PACS
21.45.+v - Few-body systems.
21.10.Hw - Spin, parity, and isobaric spin.
27.20.+n - .

© Società Italiana di Fisica, Springer-Verlag 2002