A.J. Cox

New results for reaction cross sections of intermediate energy α-particles on targets from 9Be to 208Pb

Abstract Reaction cross sections for α -particles have been measured for 9 Be, 12 C, 16 O, 28 Si, 40 Ca, 58,60 Ni, 112,116,120,124 Sn, and 208 Pb at 117.2, 163.9 and 192.4 MeV and for the lighter nuclei also at 69.6 MeV. The results are compared with predictions from optical model calculations using phenomenological, global and double-folded optical potentials. Comparisons are also made with predictions using the Glauber model approach suggested by Bertsch, Brown and Sagawa.

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%.

Proton loss by nuclear inelastic interactions in CsI, NaI, NE102, NE213 and stilbene

Abstract The percentage of protons undergoing nuclear inelastic interactions has been measured in a direct counting experiment, for protons with energies between 20 and 50 MeV incident on CsI, NE102 (plastic scintillator) and Stilbene, and for incident energies between 20 and 150 MeV on NaI. These values have been determined to about 3%, with smaller errors than this at the higher energies and larger errors than this at the low energies. New calculations of this quantity between 20 and 50 MeV have also made, using available reaction cross section information with uncertainties of about 5%. These calculations are compared with the experimental results and show excellent agreement. Other existing reaction percentage information is compared with the present experimental and calculational results and shows good agreement.

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.

Scintillator signal reduction by proton nuclear interactions in BGO, BaF2, and CaF2

Abstract The percentages of proton undergoing nuclear interactions while stopping in the scintillators BGO, BaF2 and CaF2 have been measured in direct counting experiments for incident proton energies between 20 and 40 MeV. These values have been determined to an accuracy of ± 2% or better. Calculations of the proton reaction percentages over the energy range zero to 50 MeV have also been made with an uncertainty of 3 to 5% using previously reported reaction cross section values. The calculated reaction percentages show excellent agreement with the experimental results.

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.