Photonuclear reaction in {67}^Zn

Mono-energetic $\gamma$-beams (\Delata \approx 10 eV) based on thermal neutron capture, in a nuclear reactor, using the Mn(n, $\gamma$) reaction were utilized for generating a fast neutron source from Zinc, via the ${67}^Zn(\gamma, n)$ reaction. One of the incident $\gamma$-lines of the Mn source at $E_\gamma$ = 7244 keV, photoexcites by chance a resonance level in {67}^Zn, with subsequent emission of neutrons at an energy of 191 keV. The cross-section for this process was measured and found to be $\sigma(\gamma, n)$ = 252 $\pm$ 41 mb with an intensity of the order of 104 n/s. The angular distribution of the 191 keV neutron group was also measured.Comment: arXiv admin note: substantial text overlap with arXiv:2111.1192

Elastic and Raman scattering of 9.0 and 11.4 MeV photons from Au, Dy and In

Monoenergetic photons between 8.8 and 11.4 MeV were scattered elastically and in elastically (Raman) from natural targets of Au, Dy and In.15 new cross sections were measured. Evidence is presented for a slight deformation in the 197Au nucleus, generally believed to be spherical. It is predicted, on the basis of these measurements, that the Giant Dipole Resonance of Dy is very similar to that of 160Gd. A narrow isolated resonance at 9.0 MeV is observed in In.Comment: 31 pages, 11 figure

Comment on “Possible Precise Measurement of Delbrück Scattering Using Polarized Photon Beams” (https://doi.org/10.1103/PhysRevLett.118.204801)

It is pointed out that the proposal of Koga and Hayakawa, to measure Delbruck scattering with polarized photons of 1 MeV, is based on a wrong assumption of the Giant Dipole Resonance behavior

Comment on “Compton Scattering Spectrum for Si and Ge Systems” (Chen-Kai Qiao et al. DOI 10.1088/1361-6471/ab5e35)

It is pointed out that some theoretical results concerning Compton scattering were already experimentally verified some 50 years ago

Backscattering of MeV Electrons. An Analysis of Tabata's Experiment with Geant4

A series of simulations were conducted with Geant4 in order to verify the electron backscattering experiments performed by Tabata in the low Z elements of Be, C, and Al. In general, quite good agreement was obtained by carefully choosing the physics lists employed. These results invalidate the claim made before about the presence of experimental errors in the above work

Optimizing the Teflon thickness for fast neutron detection using a Ge detector

The optimum Teflon (C2F4)n thickness for fast neutron detection through the 19F(n,α)16N reaction was calculated and found to be ≈ 5.0 cm. Here, the 6.13 MeV γ ray emitted by 16N is assumed to be detected by a Ge diode. The geometry of the system is discussed and the γ line intensity was found to vary weakly with Teflon thickness