Using as a base the beta energy spectra provided by T. R. England, the number spectra of \lSr""and |°Y were corrected for the Coulomb effects on the first forbidden shape factor using the tables of M. E. Rose, anc for higher order effects using the experimentally determined corrections of H. Daniel et al. We, therefore, present a fully corrected beta number spectrum of l£Sr and its daughter f°Y.The half-lives and end-point energies are also listed.
An evaluation of the smooth neutron total cross section for tungsten between 0.02 and 22 MeV is presented. It is argued that present evidence does not warrant separate treatment for the isotopes except for fluctuations and below 0.7 MeV.
The optimization of light absorption in a weakly absorbing medium is studied by repeatedly reflecting a light beam from either plane or cylindrical canted and parallel mirrors. Vertical control is exerted either by horizontal mirror reflection, by cylindrical end mirrors, or by wellcollimated or focused beams. Useful absorption for a number of numerical parameters is calculated. The gross properties of lasers are characterized for geometrical optical purposes. Beam insertion optics are evaluated. Chamber and mirror energetics are considered. In the Appendix one of us (JJD) gives the shape and speed of a light beam eating its way into a very highly absorbing medium.
The total Be (d,n)B ,B cross section is constructed by theoretically completing an experimental partial absolute cross section and using it to normalize a relative measurement which in turn was extrapolated to below 0-5 MeV by the relative energy dependence of the coulomb penetration factor.
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