W. A. Sterrenburg

Energy Systematics of the Giant Gamow-Teller Resonance and a Charge-Exchange Dipole Spin-Flip Resonance

Energy systematics of the giant Gamow-Teller resonance and a charge-exchange resonance excited by a L = 1, S = 1 interaction are presented. Plots of the energy separation between each resonance and the IAS versus (N − Z)A can be represented approximately by linear functions.

Comparison of /sup 24,25,26/Mg(p,n)/sup 24,25,26/Al cross sections with giant M1 strength. [35 MeV]

Cross sections for the /sup 24,25,26/Mg (p,n) /sup 24,25,26/A1 reaction have been measured at 35 MeV. The strengths of the larger spin-isospin-flip transitions correspond surprisingly well with the matrix elements of the analogous giant M1 transitions.

The 26Mg(p, n)26Al reaction and the energy dependence of the spin-isospin effective interaction☆

Abstract Cross section for the 26 Mg(p, n) 26 Al reaction leading to the isobaric analog state and to low-lying 1 + , T = 0 states have been measured at bombarding energies of 24.6, 35.0 and 45.0 MeV. Several different approaches have been used to obtain values of the spin-flip ( V στ ) and no spin-flip ( V τ ) parts of the effective interactions. The ratio V στ / V τ increases with increasing energy between 25 and 45 MeV. Extracted values of V στ are somewhat larger than those obtained from lighter nuclei.

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.

Techniques for measuring neutron scattering cross sections with a beam swinger

Abstract Techniques have been developed for measuring neutron elastic and inelastic scattering cross sections using a beam swinger based time-of-flight system. The use of a beam swinger has significant advantages at high neutron energies because of the simplification of shielding arrangements and the convenient use of long flight paths to obtain high resolution. Applications have been made to neutron scattering at 30.3 and 40 MeV.