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New limit in the search for spontaneous pion emission from252Cf source
Authors:J Julien  V Bellini  Y Cassagnou  C Cerruti  J M Hisleur  R Legrain  B Lucas
Institution:1. Département de Physique Nucléaire, CEN Saclay, F 91191, Gif-sur-Yvette Cedex, France
3. Laboratoire National Saturne, CEN Saclay, F 91191, Gif-sur-Yvette Cedex, France
Abstract:A new experiment was carried out at Modane (Laboratoire Souterrain de Modane, France) to determine the ratio \({{\Gamma _{\pi ^0 } } \mathord{\left/ {\vphantom {{\Gamma _{\pi ^0 } } {\Gamma _{SF} }}} \right. \kern-0em} {\Gamma _{SF} }}\) with a252Cf source. The very small cosmic ray rate measured on these premises allowed to assign an upper limit of 10?12 at 95% confidence level to \({{\Gamma _{\pi ^0 } } \mathord{\left/ {\vphantom {{\Gamma _{\pi ^0 } } {\Gamma _{SF} }}} \right. \kern-0em} {\Gamma _{SF} }}\) .
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