### TEST OF ISOTOPIC SPIN CONSERVATION FROM AN EXPERIMENT LIMIT ON ](d + d $Yields$ He$sup 4$ + $pi$sup 0$)TEST OF ISOTOPIC SPIN CONSERVATION FROM AN EXPERIMENT LIMIT ON ](d + d$Yields$He$sup 4$+$pi$sup 0$)

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 Author Poirier, J. A. ♦ Pripstein, M. Source United States Department of Energy Office of Scientific and Technical Information Content type Text Language English
 Subject Keyword PHYSICS Abstract The reaction d + d yields He/sup 4/ + pi /sup o/, which is forbidden by isotopic spin conservation is sought. A beam of deuterons at 460 Mev is scattered from an extended target filled with deuterium gas at 25 atm pressure and at liquidnitrogen temperature. The differential cross section in the center- of-mass system at 90 deg is measured and a value of (18 plus or minus 2.3) x 10/sup -//sup 3//sup 4/ cm/sup 2//sr is obtained. This value is considered to be an upper limit for the reaction; the data are consistent with no pi /sup o/ production. From a comparison of this upper limit with the theoretical prediction of the cross section for this reaction if isotopic spin need not be conserved, it is concluded that isotopic spin is at least 93.5% conserved. (auth) ISSN 0031899X Educational Use Research Learning Resource Type Article Publisher Date 1961-06-15 Publisher Department Univ. of California, Berkeley Publisher Place United States Journal Physical Review Volume Number 122 Technical Publication No. UCRL-9544 Organization Univ. of California, Berkeley