2020 Impact factor 3.043
Hadrons and Nuclei


Eur. Phys. J. A 11, 279-284 (2001)

Analysis of decay data from neutron-rich nuclei

U.C. Bergmann1, M.J.G. Borge2, J. Cederkäll3, C. Forssén1, E. Fumero4, H.O.U. Fynbo3, H. Gausemel5, H. Jeppesen6, B. Jonson1, K. Markenroth1, T. Nilsson3, G. Nyman1, K. Riisager6, H. Simon7, O. Tengblad2, L. Weissman3, F. Wenander1, K. Wilhelmsen Rolander4 and the ISOLDE Collaboration3

1  Experimentell Fysik, Chalmers Tekniska Högskola, S-412 96 Göteborg, Sweden
2  Instituto Estructura de la Materia, CSIC, E-28006 Madrid, Spain
3  EP Division, CERN, CH-1211 Genève 23, Switzerland
4  Fysiska Institutionen, Stockholms Universitet, Box 6730, S-113 85 Stockholm, Sweden
5  Kjemisk Institutt, Universitetet i Oslo, Postboks 1033, Blindern, N-0315 Oslo, Norway
6  Institut for Fysik og Astronomi, Aarhus Universitet, DK-8000 Aarhus C, Denmark
7  Institut für Kernphysik, Technische Universität, D-64289 Darmstadt, Germany

kvr@ifa.au.dk

(Received: 3 May 2001 / Revised version: 26 June 2001 Communicated by J. Äystö )

Abstract
The $\beta$-decays of the neutron-rich nuclei 12Be and 29Ne have been studied. The statistical correlations between the almost identical half-lives of 12Be and its daughter 12B are analysed for a large sample of 12Be decay data. Stringent mutual bounds are obtained on the parameter set, leading to a precise determination of the 12Be half-life of $21.50\pm 0.04$ ms. From a simultaneous detection of $\beta$-particles and neutrons from the decay of 29Ne the neutron emission probability, Pn, is determined to $17\pm 5$% . No indication of two-neutron emission is seen from this nucleus. An upper limit of 2.2% (90% confidence level) is established for P2n.

PACS
23.40.-s - Beta decay; double beta decay; electron and muon capture.
27.20.+n - $6\leq A \leq 19$ .
27.30.+t - $20 \leq A \leq 38$ .
07.05.Kf - Data analysis: algorithms and implementation; data management.

© Società Italiana di Fisica, Springer-Verlag 2001