Charles A. Goulding

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.

Search for isobaric analogues of M1 states and giant spinflip resonances in the 208Pb(p, n) reaction

Abstract The 208 Pb(p, n) 208 Bi reaction has been studied at E p =120 and 160 MeV . The GT resonance is found to be concentrated in disagreement with a recent theoretical suggestion that it is highly fragmented in heavy nuclei, but in good agreement with an earlier calculation. A giant Δl = 1, ΔS = 1 resonance is also observed.

A Facility for Studying Neutron Energy Spectra at Intermediate Energies

Apparatus for measuring neutron energy spectra in the 50-200 MeV range is described. The apparatus, installed at the Indiana University Cyclotron Facility, consists of a beam swinger to change the angle of incidence of the beam on target, 100 m flight paths, large, subnanosecond neutron detectors, and a system for deriving phase stabilized timing signals.

Comparison of the 12C(p, n)12N and 12C(p, p′) reactions at Ep = 62 and 120 MeV☆

Abstract Measured 12 C(p, p′) and 12 C(p, n) 12 N reaction cross-section angular distributions leading to isobaric analog states are compared at 62 and 120 MeV bombarding energies. It is shown that the (p, p′) differential cross section is one-half the (p, n) differential cross section to the analog state. This relation and these reactions are demonstrated to be very useful for the determination of the detection efficiency of large volume neutron detectors at intermediate energies.

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

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

Experimental Determinations of Neutron Detector Efficiencies

The most difficult part of obtaining neutron differential cross sections is the determination of the efficiency of the neutron detection system. One method is the use of sophisticated computer codes to calculate the absolute efficiency, as previously described by B. Anderson,1 and the other is to measure the efficiency experimentally, which will be discussed here.