E1 transitions between spin-dipole and Gamow-Teller giant resonances

The branching ratios for E1 transitions between the spin-dipole (SD) and Gamow-Teller (GT) giant resonances in $^{90}$Nb and $^{208}$Pb are evaluated. Assuming the main GT-state has the wave function close to that for the "ideal" GT-state, we reduced the problem to calculate the SD and GT strength functions. These strength functions are evaluated within an extended continuum-RPA approach.Comment: 8 pages, submitted to Phys. Rev.

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

Neutron Matter Distributions from Quasi-Elastic (p,n) Reactions

Supported by the National Science Foundation and Indiana Universit

Do Hadronic Charge Exchange Reactions Measure Electroweak L = 1 Strength?

An eikonal model has been used to assess the relationship between calculated strengths for first forbidden beta decay and calculated cross sections for (p,n) charge exchange reactions. It is found that these are proportional for strong transitions, suggesting that hadronic charge exchange reactions may be useful in determining the spin-dipole matrix elements for astrophysically interesting leptonic transitions.Comment: 14 pages, 5 figures, Submitted to Physical Review

High Efficiency Detectors for Time-of-Flight with High Energy Neutrons

Experience in achieving sub-nanosecond time resolution with neutrons about 100 MeV on a scintillation detector 15 x 15 x 100 cm viewed by a single phototube is discussed. Time compensation is accomplished by tilting the scintillator axis with respect to the neutron flight path as discussed previously. The interplay between the time compensation from the geometry of light collection and the electronic technique for picking off the time signal is described

Measurement of Asymmetries in the 12,13,14-C(p,n) Reactions

This work was supported by the National Science Foundation Grant NSF PHY 78-22774 A02 & A03 and by Indiana Universit

13-C(p,n)13-N at Intermediate Energy

Supported by the National Science Foundation and Indiana Universit

The 12-C(p,n) 12-N Reaction at 120, 160, and 200 MeV

This work was supported by the National Science Foundation Grant NSF PHY 78-22774 A02 & A03 and by Indiana Universit