M. Danysz, K. Garbowska, J. Pniewski, T. Pniewski, and J. Zakrzewski
Institute of Experimental Physics, University of Warsaw, Warsaw, Poland
Institute for Nuclear Research, Warsaw, Poland
E. R. Fletcher
H. H. Wills Physics Laboratory, University of Bristol, Bristol, England
J. Lemonne, P. Renard*, and J. Sacton
Université Libre de Bruxelles, Bruxelles, Belgium
W. T. Toner†
CERN, Geneva, Switzerland
D. O'Sullivan, T. P. Shah, and A. Thompson
Institute for Advanced Studies, Dublin, Ireland
P. Allen, Sr.‡, M. Heeran, and A. Montwill
University College, Dublin, Ireland
J. E. Allen, M. J. Beniston§, D. H. Davis, and D. A. Garbutt
University College, London, England
V. A. Bull, R. C. Kumar, and P. V. March
Westfield College, London, England
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.11.29
DOI:
10.1103/PhysRevLett.11.29
*Chercheur Agréé à l'Institut Interuniversitaire des Sciences Nucléaires, Belgique.
†Supported by the British Emulsion Committee.
‡Now at University College, London, England.
§Now at the Enrico Fermi Institute for Nuclear Studies, The University of Chicago, Chicago, Illinois.