Title: Nuclear moments and nuclear structure. Annual progress report, January 1, 1973--May 31, 1973

A new program studying the behavior of nuclear matter under very high excitation was begun at the Bevatron with experiments designed to study the gamma radiation emitted from central collisions of heavy ions. A system was partially completed that made use of a multiplicity detector as a signature of a central collision. The system was surrounded by gamma detectors for both the nuclear and high-energy range; such an arrangement yielded a very large acceptance. A preliminary experiment showed the feasibility of the system and gave the first results of correlations of gamma rays with such collisions. Some details of bothmore » the system and the preliminary results are described. Experiments on the measurement of nuclear moments from beta emission are reviewed, and the final results for the latest measurements on /sup 9/Li are given. Results of recent measurements on gamma polarization from high-spin states of /sup 105 -109/Cd are also presented. Studies of electrons resulting from heavy ion collisions using a special high-acceptance beta spectrometer are described. The preliminary results indicate the beginnings of effects that are complements of the so-called combined atom x-ray phenomena. A new program for the study of gamma rays and neutrons produced in the capture of pi meson of nuclei are described with some new results on the excitation of high-spin states. Finally, a reprint of a recent evaluation of some old data concerned with the conserved vector current theory is added.« less

This report reviews activities for the period from August 1, 1978 through July 31, 1979. Four experiment reports and a list of publications are included. Separate abstracts were prepared for unpublished data. (RWR)

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 suchmore » 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)« less