Jun Kokame

Elastic Scattering of Protons from B¹¹, Al, P, Co and Cu from 6 to 7.4 MeV

The energy dependence of the angular distributions of protons elastically scattered by the odd nuclei, B 11 , Al, P, Co and Cu, was measured in the energy range from 6 to 7.4 MeV by using the 105 cm Kyoto University Cyclotron. No remarkable energy dependence of the pattern of the angular distributions was found in all the energy and angular ranges studied. It may be concluded that a less energy dependence of the angular distributions of protons elastically scattered by the odd nuclei is due to a less contribution of the compound elastic scattering and moreover a less energy dependence of the compound elastic scattering.

Excitation of unnatural-parity states in (α, α′) scatterings on O16, Ne20, Mg24 and Si28 at 28.5 MeV

The excitation of unnatural-parity states (2/sup -/, 3/sup +/, etc.) was investigated at E/sub alpha / = 28.5 Mev on /sup 16/O, /sup 20/Ne, /sup 24/Mg, and /sup 28/Si at forward angles smaller than 90 deg (lab). Angular distributions of the inelastically scattered alpha particles are shown. Possible reaction mechanisms are discussed. (R.E.U.)

The (p. t) Reaction on Even-Even Deformed Nuclei

The (p, t) reactions on 158 Gd, 164 Dy, 172 Yb, 176 Hf and 184 W have been studied with 51.7 MeV protons. Triton spectra have been measured with a broad-range magnetic spectrometer with a 200 proportional-counter array. The cross sections for the states of the ground state rotational band which have been found to depend on mass number, have been analyzed by the distorted-wave Born-approximation. Especially Y 4 -diformation parameter β 4 for each nucleus has been obtained from the cross section for the 4 + state of the ground state rotational band. The cross sections for the first excited 0 + states have been found to have a mass number dependence and this dependence was compared with the prediction based on the pairing vibrational mode.

The (3He, 3He), (3He, 3He') and (3He, α) Reactions on 12C at 82.1 MeV

The nucleus 12 C was bombarded by 82.1–MeV 3 He particles to study elastic and inelastic scattering and the ( 3 He, α) reaction. Angular distributions were measured for the elastic scattering, for the inelastic scattering to levels at 4.4, 7.6 and 9.6 MeV in 12 C, and for the ( 3 He, α) reaction to levels at 0.0, 2.0, 4.3(4.7) and 6.4 MeV in 11 C. The optical potential parameters were searched for to fit the 3 He elastic scattering angular distribution. The deformation parameters β 2 and β 3 for 12 C were determined from DWBA analysis. The angular distributions of a particles were compared with DWBA calculations and calculations including the two-step process via inelastic channel.

Inelastic Scattering of Protons from Several Light Odd-Even Nuclei in the Energy Range from 6.0 MeV to 7.5 MeV

Protons accelerated the 105 cm cyclotron of Kyoto University were used to investigate the energy dependence of the angular distributions and the reaction mechanism of the inelastically scattered protons from the odd-even nuclei, B 11 , F 19 , Al 27 and P 31 at 6.0∼7.5 MeV using conventional electronic techniques. It was found that (a) the energy dependence of the angular distribution has close relation to the excitation energy of the compound system, namely above the excitation energy of about 13 MeV in the compound system, many patterns of the angular distributions including that of the light even-even nuclei were relatively energy-independent: (b) Total cross sections were considerably smaller than that of the neighbouring even-even nuclei and less energy-dependent: (c) In the case of F 19 the shapes of the angular distributions suggested the existence of a direct interaction: (d) The relative yields from the various levels of Al 27 might have some relation to its nuclear structure in the Nilsson model.

Electron Beam Extraction from INS AG Synchrotron. Part II. Experiment

The electron beam has been extracted from the INS 750 MeV AG synchrotron. A Piccioni scheme was applied and the extraction efficiency obtained was 10% at the electron energy of 540 MeV and 5% at 700 MeV. The behaviour of the beam inside and outside of the synchrotron was studied in comparison with the theoretical analysis. The pulse duration of the extracted beam could be extended to the order of 700 µs without any difficulty for the 21.5 cps operation of the synchrotron.

OBSERVATION OF THE DEFLECTED ION BEAM TRAJECTORY FROM A CYCLOTRON

A simple and convenient method has been employed to determine the trajectory of the deflected ion beam from a cyclotron. Using several mesh screens across the beam path, the location and angular divergence of the beam in various places can be obtained simultaneously by the holes made by the ion bombardment on these meshes.