[en] Continous energy spectra of Helium-3 from ³He + ³He scattering have been studied at the incident energy of 120 MeV. A broad bump is seen at the high energy side in each spectrum. Correlation spectra from ³He(tau,tau p)d. d show the peak for quasi-free scattering. In the energy spectrum at theta₂ = 20⁰ and theta sub(p) = 40⁰, a peak has been observed in the region outside the quasi-free process. This peak suggests the presence of the excited state of helium-3. Further experiments are underway. (author)

[en] The (³He,α) reactions at 110 - 120 MeV on even tin isotopes revealed the presence of the new (1g)^-1 state at Ex = 6 -- 7 MeV with a spectroscopic factor comparable to the known (1g sub(9/2))^-1 deeply bound hole state. (author)

[en] Angular distributions of elastically scattered ³He particles from ⁵⁴Fe, sup(58,60)Ni and deuterons from the reactions ⁵⁴Fe(³He, d)⁵⁵Co and sup(58,60)Ni(³He, d)sup(59,61)Cu have been measured at a ³He energy of 90 MeV. Optical model calculations give two sets of potential parameters which reproduce well the elastic scattering data in the angular region 14⁰ -- 93⁰. DWBA analyses were carried out for the (³He, d) reaction data using these two sets of ³He optical model parameters. The results show that the deep potential set is preferable for the DWBA analysis of the (³He, d) reaction data. (author)

[en] The elastic scattering of 109.2 MeV ³He particles by ⁴⁰Ca, ⁵⁸Ni, ⁹⁰Zr and ¹¹⁶Sn has been investigated over a wide angular range. The elastic scattering cross sections have been analyzed in terms of the optical model. The data for each nucleus studied were sufficient to eliminate the discrete ambiguity in the strength of the optical potential; the unique potential which fits the data has real well depth of about 100 MeV and a corresponding volume integral per nucleon pair of about 310 MeV fm³. The elastic scattering of ³He particles by ⁵⁸Ni has been further measured at bombarding energies of 89.3 and 118.5 MeV, and the incident-energy dependence of the optical potential of ³He particles for ⁵⁸Ni was obtained. (author)

[en] Spin polarization of ¹²B was measured for the heavy-ion induced reaction ¹⁰⁰Mo(¹⁴N,¹²B) at E(¹⁴N) = 125 MeV. Large and negative polarization was found at larger Q value (Q sub(gg) = -7.5 MeV>Q>-25 MeV), as previously measured at E(¹⁴N) = 90 MeV. This was followed by small polarization with both signs as Q value decreased down to Q asymptotically equals -70 MeV. (author)

[en] The polarization in proton-proton scattering at E sub(p) = 52.34 and 68.19 MeV have been measured with an accuracy of 0.1 -- 0.2% at angles from 30⁰ to 100⁰ in the center of mass system, in order to resolve the ambiguity of ³P₀ phase shift in this energy region. The results of the phase shift analysis of the present data with the other existing data of proton-proton scattering in this energy region are consistent with the results of Livermore group and Virginia group, except the ³P₀ phase shift. The value of ³P₀ phase shift we obtained is 12.99⁰ +- 0.16⁰ at 52.34 MeV in comparison with 10.58⁰ of MAW-X. (author)

[en] The decay of ¹⁵⁶Er has been investigated with the ¹⁶⁰Dy(α, 8n) reaction at a alpha particle energy of 120 MeV. The gross excitation function of alpha particle reaction to ¹⁶⁰Dy was examined at the 90, 100 and 110 MeV energy decreasing from 120 MeV with aluminum absorbers on the irradiation facility of I course. As a result of the excitation function, the threshold energy of ¹⁶⁰Dy(α, 8n) reaction was estimated to about 100 MeV of alpha particles on laboratory system. Then, the irradiation energy of 110 MeV was chosen for the production of ¹⁵⁶Er. The gamma rays and X rays spectra from ¹⁵⁶Er were studied with 40 cc Ge(Li) detector and 0.5 cc pure Ge detector, and the half life was measured. (author)

[en] Proton-deuteron energy correlation in the ⁹⁰Zr(³He, pd)⁹⁰Zr reaction has been measured at a ³He energy of 70 MeV. The summed energy of the main loci in the p-d coincident spectra lies near the ³He break-up threshold energy. This energy correlation shows the p-d pairs mainly originate from the direct break-up process of the incident ³He leaving the ⁹⁰Zr nucleus in (or near) its ground state. (author)

[en] Preequilibrium and equilibrium deexcitation processes were studied for (particle, xn, yp, γ) reactions on medium and heavy nuclei. Highly excited nuclei produced by interaction of medium energy projectiles with medium heavy nuclei deexcite firstly by emitting a number of nucleons at the preequilibrium phase, and later on by emitting nucleons (mostly neutrons) at the equilibrium phase. The preequilibrium process gets important for projectiles with velocity near the Fermi motion in nuclei. The deexcitation processes were studied by investigating the particles and gamma rays emitted through the deexcitation processes. In particular observation of decay particles in coincidence with descrete gamma rays characteristic of the reaction channels (residual nuclei) was found to be quite useful. Detailed investigations were made on the following subject. (author)

[en] Experiments for the production of new neutron-rich nuclei have been done by using high flux fast neutron beam generated by an AVF cyclotron at RCNP, Osaka University. Obtained fast neutron flux was more than 10¹⁰ n/cm².sec.μA, and then this neutron beam was used for the production of a new nuclide ¹⁶⁸Dy by the reaction ¹⁷⁰Er(n,2pn)¹⁶⁸Dy. (author)