269 research outputs found
Neutrino capture by r-process waiting-point nuclei
We use the Quasiparticle Random Phase Approximation to include the effects of
low-lying Gamow-Teller and first forbidden strength in neutrino capture by very
neutron-rich nuclei with N = 50, 82, or 126. For electron neutrinos in what is
currently considered the most likely r-process site the capture cross sections
are two or more times previous estimates. We briefly discuss the reliability of
our calculations and their implications for nucleosynthesis.Comment: 9 pages, 4 figure
Splitting of the Dipole and Spin-Dipole Resonances
Cross sections for the 90,92,94Zr(p,n) reactions were measured at energies of
79.2 and 119.4 MeV. A phenomenological model was developed to describe the
variation with bombarding energy of the position of the L=1 peak observed in
these and other (p,n) reactions. The model yields the splitting between the
giant dipole and giant spin dipole resonances. Values of these splittings are
obtained for isotopes of Zr and Sn and for 208Pb.Comment: 14 pages, 4 figure
Measurement of the Transverse Spin Transfer Coefficient D_nn(0˚) for (p,n) Reactions at 160 MeV
This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440
General Features of the Gamow-Teller Resonances
This work was supported by the National Science Foundation Grant NSF PHY 78-22774 A02 & A03 and by Indiana Universit
Solar Neutrino Detector GT Strength Distributions Via (p,n) Reactions
This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana Universit
Energy Dependence of the Ratio of Isovector Effective Interaction Strengths |J_στ/J_τ| from 0° (p,n) Cross Sections
This work was supported by the National Science Foundation Grants NSF PHY 78-22774 A03, NSF PHY 81-14339, and by Indiana Universit
Gamow-Teller Strength in Simple Nuclei and Renormalization of the Axial-Vector Coupling Constant
This work was supported by the National Science Foundation Grants NSF PHY 78-22774 A03, NSF PHY 81-14339, and by Indiana Universit
Excitation of Giant Spin-Isospin Multipole Vibrations in 54,56-Fe and 58,60-Ni
This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana Universit
Gamow-Teller Matrix Elements and the (p,n) Reaction
This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440
Gamow-Teller Resonances Observed in 90,92,94-Zr(p,n) at 120 and 160 MeV
Supported by the National Science Foundation and Indiana Universit
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