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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 12, 383-386 (2001)

New measurement of exotic decay of $\chem{^{225}Ac}$ by $\chem{^{14}C}$ emission

A. Guglielmetti1, R. Bonetti1, G. Ardisson2, V. Barci2, T. Giles3, M. Hussonnois4, J.F. Le Du4, C. Le Naour4, V.L. Mikheev5, A.L. Pasinetti6, H.L. Ravn3, S.P. Tretyakova5 and D. Trubert4

1  Istituto di Fisica Generale Applicata dell'Università di Milano and INFN, Sezione di Milano, Via Celoria 16, I-20133, Milano, Italy
2  Laboratoire de Radiochimie, Université de Nice Sophia-Antipolis 06108 Nice Cédex, France
3  CERN, EP Division, Geneva, Switzerland
4  Institut de Physique Nucléaire, BP N° 1 91406 Orsay Cédex, France
5  Joint Institute for Nuclear Research, Dubna, 141980, Moscow Region, Russia
6  Dipartimento di Fisica dell'Università di Milano and INFN, Sezione di Milano, Via Celoria 16, I-20133, Milano, Italy

alessandra.guglielmetti@mi.infn.it

(Received: 20 July 2001 / Revised version: 17 October 2001 Communicated by J. Äystö)

Abstract
The branching ratio of $\chem{^{225}Ac}$ decay by emission of $\chem{^{14}C}$ was remeasured under improved experimental conditions by using a radioactive source produced at the ISOLDE mass-separator at CERN and a nuclear track detector technique. The result, $B=\lambda _{\chem{^{14}C}} / \lambda_{{\alpha}} = (4.5 \pm 1.4) 10^{-12}$, is consistent with the anomalously high value obtained in the 1993 experiment, thus confirming the importance of nuclear-structure effects in this exotic decay.

PACS
23.70.+j - Heavy-particle decay.

© Società Italiana di Fisica, Springer-Verlag 2001

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