B. S. Ghumman

Experimental study of angular dependence in double photon Compton scattering

Abstract The collision differential cross-section and energy of one of the final photons for double photon Compton scattering have been measured as a function of scattering angle θ1. The incident photon energy is 0.662 MeV and thin aluminium foils are used as a scatterer. The two simultaneously emitted photons in this higher order process are detected in coincidence using two NaI(Tl) scintillation spectrometers and 30 ns timing electronics. The measured values for energy and collision differential cross-section agree with theory within experimental estimated error. The present data provide information of angular dependence in this higher order process.

Compton scattering of 0.279 MeV gamma rays fromK-shell electrons of lead

Differential cross-sections for Compton scatterig of 0.279 MeV gamma rays fromK-shell electrons of lead are measured at scattering angles ranging from 30 to 150° to study the effect of binding on the scattering process. Measurements are made employing two Nal(Tl) scintillation spectrometers and a slow-fast coincidence set-up of 30 nsec resolving time. The experimental results are compared with the available theoretical data. The totalK-shell Compton scattering cross-section is 34% of the free electron Compton cross-section.

Investigations of Angular Distribution in Two-Photon Compton Scattering

The cross-section for two-photon Compton scattering for incident photons of energy 0.662 MeV and two emitted photons having energies greater than 50 keV has been measured at different scattering angles θ 1 =30° to 150° and θ 2 =π/2; φ 2 =π. Our measured results, although of same magnitude, are consistently higher as compared to theory of Mandl and Skyrme. Some calculations of energy and direction of the recoil electron are also carried out to understand the important features of this weak process.

Energy and intensity distributions in double photon Compton scattering

The energy and intensity distributions of the gamma rays scattered in the double photon Compton scattering process are measured experimentally for 0.662 MeV incident photons. The two scattered photons are detected in coincidence using two NaI(Tl) scintillation spectrometers and 30 ns timing electronics. The results are in agreement with the theory of Mandl and Skyrme (1952).

Compton scattering of 145 keV photons from bound electrons of tin and molybdenum

Differential cross sections for Compton scattering of 145 keV gamma rays from K-shell electrons of tin and molybdenum at scattering angles in the range 30 to 150 degrees . Measurements are made employing NaI(Tl) detectors and a coincidence set up with resolving time approximately=30 ns. The experimental results are compared with the available theoretical data. The total cross section is estimated to be about 0.43 sigma F for tin and 0.41 sigma F for molybdenum.

Measurement ofL-shell photoelectric cross sections in highZ elements at 37 and 74 keV

L-shell photoelectric cross section measurements have been made at 36·818 and 74·409 keV for four elements in the range 81 ≤Z ≤ 92. The measurements at 74·409 keV are found to agree with theory, within experimental uncertainties, but the experimental values at 36·818 keV are found to be higher than the theoretical predictions. The possible reasons for the observed discrepancy are discussed.

Experimental Study of Energy Distribution in Double Photon Compton Scattering

Abstract The energy distribution of gamma photons scattered in double photon Compton scattering is measured experimentally for 0.662-MeV incident gamma photons. The two simultaneously emitted gamma quanta are investigated using a slow-fast coincidence technique. The experimental data on energy distribution do not suffer from inherent energy resolution of the gamma detector and confirm the continuous nature of energy spectra for the emitted photons. The present results are in agreement with the current theory of this higher-order process.

Measurement of double-photon Compton scattering cross-sections of 662 keV gamma rays

The cross-section for double-photon Compton scattering for incident photons of energy 662 keV and two emitted photons having energies ⩾ 100 keV has been measured at different scattering angles θ1 = 30° to 150° and θ2 = φ2 = π2. The experimental results are compared with the theory of Mandl and Skyrme. Some calculations are also carried out to understand the important features of the phenomenon.

Intensity distribution of 0.279 MeV gamma rays Compton scattered from K-shell electrons of tungsten

Differential incoherent scattering cross sections of 0.279 MeV gamma rays from K-shell electrons of tungsten are measured at scattering angles ranging from 30° to 150°. Measurement are made employing two NaI(Tl) scintillation spectrometers and a coincidence set up of 40 nsec resolving time. The experimental results are compared with the available data. The total K-shell Compton cross section is found to be about 36% of the free electron Compton cross section.

Measurement of K shell photoelectric cross section of Ba K x-rays in Y, Zr, Mo, Ag, Cd and Sn

Abstract The K-shell photoelectric cross sections of Ba K X-rays in Y, Zr, Mo, Ag, Cd and Sn have been measured. The measured values of the cross sections agree fairly well with the calculated values of Scofield.