Yukio Nagahara

ELASTIC AND INELASTIC SCATTERING OF PROTONS FROM N, Ne, Mg, Si, S AND A IN THE ENERGY RANGE FROM 7.6 Mev TO 14.2 Mev

The angular distributions of protons scattered elastically and inelastically by N, Ne, Mg, Si, S and A nuclei have been studied at several values of proton energy from 7.6 to 14.2 MeV. The distribution shapes for elastic scattering show generally diffraction patterns at E p >10 MeV. While the yields of inelastic scattering corresponding to the second excited state of N 14 are appreciable at higher energies, the yields for the first excited state with T =1 are markedly low. The inelastic scatterings for the first excited states of Ne 20 , Mg 24 and Si 28 are found to change their distribution shapes appreciably with proton energy. The excitation functions of the reaction for Si 28 were also studied. The results show prominent resonance features. These results seem to support that the formation of compound nucleus plays an appreciable role in the inelastic scattering from these light nuclei, especially at the lower energy. The distribution shapes of the inelastic scattering from S 32 are fairly insensitive ...

Elastic and Inelastic Scatterings of Protons from Ti, Cr, Ni, Zn, and O at 8 to 14 MeV

The elastic and inelastic (leading to the first excited states of target nuclei) scatterings of protons by medium weight nuclei (Ti, Cr, Ni, and Zn) were studied by observing the dependence of their angular distributions on bombarding energies from 8 MeV to 14 MeV. The angular distributions of protons elastically scattered from oxygen were also measured in the same energy range. There are appreciable regularities in the elastic scatterings by medium weight nuclei as regards the dependence of their angular distributions on the bombarding energy and on the atomic number except in the case of the bombarding energy of 8 MeV. The elastic scatterings from oxygen show an anomalous behaviour at energies about 9 MeV. The angular distributions of protons inelastically scattered from medium weight nuclei can be fitted by the predictions of the direct interaction theory with Born approximation at about 14 MeV, but at the lower bombarding energies they seem not to do so, although they have the prominent forward peaks....

ELASTIC AND INELASTIC SCATTERING OF PROTONS FROM NICKEL ISOTOPES Ni

Angular and energy dependence of the elastic and the inelastic scattering of protons from nickel isotopes, Ni 58 and Ni 60 , were investigated in the energy range from 7.0 MeV to 15.3 MeV. Angular distributions in the high energy region ( E p ≥10 MeV) showed small difference between both isotopes. Energy dependence of the differential cross sections in the low energy region (7 MeV< E p <9 MeV) showed some fluctuations both for the elastic and the inelastic scattering. The inelastic yield for Ni 58 was larger than that for Ni 60 in the low energy region ( E p ≤9 MeV). These yields decreased gradually as the incident energy increased. The results of present work are compared with our previous one and with the investigations of Thirion et al., Greenlees et al., and Seward.

sup 58

Studies on excitation functions and angular distributions of alpha-particles emitted by the reaction 15 N( p , α) 12 C have been performed in the energy range of protons from 6.70 to 15.16 MeV. Excitation functions at 60°, 90°, 120° and 150° were measured in steps of 100 keV. Angular distributions of alpha-particles associated with the ground and the first excited states of 12 C were also measured in steps of 400 keV (200 keV when necessary). Many sharp or broad peaks were found in the excitation curves. The shapes of the angular distributions depend sensitively on the incident proton energy. Analysis of these results according to the cross section fluctuation theory by Fricson shows that the proportion of direct reaction is large for this reaction.

AND Ni

Energy dependence of the elastic scattering of protons from Cu 63 and Cu 65 were investigated between 7.5 MeV and 14.6 MeV. At four angles of 30°, 60°, 95° and 165°, differential cross sections were measured at about every 200 keV and angular distributions were also observed at every 800 keV for both isotopes. The observed angular distributions showed the typical diffraction patterns. An optical model analysis was made for every angular distribution and the parameters of the optical potentials were obtained as functions of incident energies.