Search

A search of neutrino magnetic moments was carried out at the Kuo-Sheng Nuclear Power Station at a distance of 28 m from the 2.9 GW reactor core. With a high purity germanium detector of mass 1.06 kg surrounded by scintillating NaI(Tl) and CsI(Tl) crystals as anti-Compton detectors, a detection threshold of 5 keV and a background level of 1 $\cpd$ near threshold were achieved. Details of the reactor neutrino source, experimental hardware, background understanding and analysis methods are presented. Based on 570.7 and 127.8 days of Reactor ON and OFF data, respectively, at an average Reactor ON electron anti-neutrino flux of $\rm{6.4 \times 10^{12} cm^{-2} s^{-1}}$, the limit on the neutrino magnetic moments of $\rm{\munuebar < 7.4 \times 10^{-11} \mub}$ at 90% confidence level was derived. Indirect bounds on the $\nuebar$ radiative decay lifetimes were inferred., 16 pages, 15 figures, 9 tables

High intensity proton beams from the Dynamitron at Brooklyn College are used to generate monochromatic gamma rays from known (p, r) resonances in various nuclei. The gamma rays, whose energy varies continuously as a function of the angle with the proton beam, are used in turn to measure photofission cross sections in 238U and 232Th. The number of suitable (p, r) resonances is sufficient to cover the 5 - 13 MeV range of excitation energy with an average step of ~ 100 keV. For a resonance of average strength the yield is 103 photons per ?A of protons on target. The energy spread is typically 20 - 40 keV and a gamma ray energy resolution of 200 eV can easily be reached. This resolution is adequate for investigating structure in the photofission cross sections resulting from class II states in the second well of the fission barrier.