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

New measurement of exotic decay of by 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. Trubert<sup>4

1</sup>  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 decay by emission of 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, , 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