Nuclear Moments and Nuclear Structure. Annual Progress Report, August 1, 1979-July 31, 1980. [Johns Hopkins Univ., Baltimore, 8/1/79-7/31/80].

Book excerpt: Activities of the period August 1, 1979 through July 31, 1980 are reviewed. The results from the relativistic heavy-ion central collisions from the Bevatron are updated, and now represent the most recent evaluation of an energy scan in a search for phase transitions in nuclear matter. The effective cross section for the pion production and additional information, incuding the multiplicity distributions and .pi.-.pi. correlations, are obtained. Preparation is underway for an approved experiment using heavier projectiles at the Bevalac, searching for the unusual production of high energy gamma-rays and lepton pairs as signatures for neutral mesons. The importance of such events as an evidence of the onset of phase transition is discussed. A brief summary is given for an alpha-alpha collision experiment at the CERN ISR in the search for unusual behavior in secondary hadron production. The measurement of the pionic x-rays using a bent crystal spectrometer is now analyzed to yield the new value for pionic mass, and upper limit for the muonic neutrino mass. Preparation is underway for the approved experiment at the TRIUMF for the study of the neutron and gamma ray correlation in .pi. capture. 18 figures, 5 tables. (RWR).