D.K. Hasell

Measurements of proton total reaction cross sections for 6Li, 7Li, 14N, 20Ne and 40Ar between 23 and 49 MeV

Abstract Measurements of proton total reaction cross sections for 6 Li, 7 Li, 14 N, 20 Ne and 40 Ar have been made in the energy range 23 to 49 MeV, using a variation of a standard attenuation technique. The measured cross sections are compared with optical-model and nuclear-transparency calculations.

PROTON LOSS BY NUCLEAR INELASTIC INTERACTIONS IN GERMANIUM

Abstract The probability of protons undergoing nuclear inelastic interactions while stopping in germanium has been measured in a direct counting experiment using protons with energies between 25 and 49 MeV incident on a germanium detector. These values have been determined to an accuracy of approximately ±2%. Calculations of the proton reaction probability over the incident energy range 20–150 MeV have also been made, using previously reported proton total reaction cross sections. The experimental and calculated results agree to within ±1.8%.

Measurement of the proton total reaction cross section for 159Tb, 181Ta and 197Au between 20 and 48 MeV

Abstract Proton total reaction cross sections have been measured for the nuclei 159 Tb, 181 Ta and 197 Au at seven proton energies between 20 and 48 MeV using an attenuation technique. The experimentally determined energy dependence of the total reaction cross sections is compared with results obtained for black nucleus and optical model calculations.

A liquid 3He target system for use at intermediate energies

Abstract A liquid 3 He target system, with remote instrumentation and handling capabilities, has been developed for experiments using the 180–525 MeV TRIUMF cyclotron. 3 He gas is liquified, by means of a 4 He cryostat, into a cylindrical target cell (4.4 cm diameter, 1.6 cm thick) and maintained during operation at ∼1.6 K. This provides an areal target density of ∼2.7×10 22 3 He nuclei/cm 2 (128 mg/cm 2 ), suitable for intermediate energy proton scattering.

The efficiency of counter telescopes for intermediate energy protons

Abstract The efficiency of counter telescopes containing a 15.2 cm thick NaI(Tl) crystal for detecting protons with energies in the range 50–350 MeV has been measured. An investigation was made of the dependence of the efficiency on the position of the proton in the counter. The results of the measurements are in close agreement with the calculations of efficiencies using available reaction cross section data.

Comparison of the 3He(p,2p)d and 3He(p,pd)p reactions☆

Abstract The 3He(p,2p)d reaction has been measured at 300 MeV at the angle pair 70°-33° and at 450 MeV at the angle pairs 70°-30° and 46°-46° for recoil momenta larger than 350 MeV/c. For the 3He(p,pd)p reaction energy sharing loci have been measured at 450 MeV for the angle pairs 25°–68°, and 50°–68°, yielding a recoil momentum range from 0 to 480 MeV/c. The proton-deutern relative motion momentum distributions were deduced in the framework of the PWIA and are compared to existing 3He(e,e′o)d results and to the momentum distribution calculated from the ovelap integral between a Hulthen deuteron wave function and an Irving-Gunn 3He wave function. Comparisons are also made with spectral function ccalculated using the Faddeev equations and variational techniques.

Measurements of the proton total reaction cross section for 24Mg, 64,66,68Zn and 140Ce between 17.5 and 48 MeV☆

Abstract Measurements of proton total reaction cross sections have been made for the deformed nuclei 24 Mg, 64,66,68 Zn and 140 Ce in the energy range 17.5 to 48 MeV using an attenuation technique. The cross sections are compared with various theoretical predictions and with existing data.

Differential cross sections for p + /sup 3/He scattering from 19. 5 to 47. 5 MeV

Differential cross sections for /sup 3/He(p,p)/sup 3/He elastic scattering have been measured at 11 energies from 19.5 to 47.5 MeV. The most forward center-of-mass angle for the angular distributions varies from 10.1 to 13.4/sup 0/, and the most backward angle varies from 163.2 to 173.4/sup 0/. The relative errors are usually less than 2%, and the scale error is 1.5%. The present data and the existing vector-analyzing power and total-reaction cross-section data are being analyzed in this energy range using the Los Alamos Scientific Laboratory R-matrix code EDA.