[en] By detecting protons from the deuteron fusion reaction ²H(d,p)³H and partial pressure of mass number 4, we made for the first time a real-time observation of an intermittent eruption of deuterium gas from surfaces of the single-crystal Si, Ge, and GaAs irradiated with 90-keV deuterium ions. As the result, ring-like craters are formed on the implanted surfaces. (author)

[en] When the particles having energy are irradiated on heavy hydride substances, D(d,p)T nuclear fusion reaction occurs in the substances, and protons are emitted. As the size of the irradiated particles becomes larger, or the number of composing atoms becomes more, it has been proposed that there is the nonlinearity in the increase of the number of proton emission. It was reported that cluster impact fusion was observed in the irradiation experiment on TiD with heavy water cluster. Its main course is shown by dividing into the experiments and theories. The authors carried out the experimental research on heavy ion impact nuclear fusion which becomes the object of comparison when the nonlinearity of the D(d,p)T reaction in cluster impact nuclear fusion experiment is discussed. The Van de Graaff accelerators in Tokyo Institute of Technology and Strasbourg Laboratory in France were used for the experiment, and the proton emission from D(d,p)T reaction was measured. The results are shown. In order to analyze the energy spectra of the protons from D(d,p)T, the calculation was carried out by using a simple two-step cascade model. The results of the analysis are shown, and were examined. It was found that this calculation reproduced the experimental results well. (K.I.)

[en] Energetic charged particles have been measured in the bombardment of 150-keV deuterons on deuterated Ti. Protons and α-particles were observed with energies up to ∼17 and ∼6.5 MeV, respectively, which can never be attained in the D+D reaction. A bump structure at around 14 MeV seen in the proton spectrum can be well explained as emitted in the sequential reaction involving three deuterons. However, protons and α-particles distributed continuously up to the maximum energies can never be understood as products of the conceivable nuclear reactions. (author)

[en] The high-spin isomer in ¹⁴⁵Sm was found using inverse kinematic reaction of ²⁰Ne(¹³⁶Xe,α7n)¹⁴⁵Sm and the recoil catcher method. The level scheme has been extended up to the spin (65/2) state at the 14.6 MeV excitation energy using reactions, ¹³⁹La(¹⁰B,4n)¹⁴⁵Sm and ¹³⁸Ba(¹³C,6n)¹⁴⁵Sm, with the prompt and delayed γγ- coincidence measurements. Spin assignment were deduced by the γ-ray angular distribution measurement. This high-spin isomer in ¹⁴⁵Sm as well as a 510nsec isomer in ¹⁴⁷Gd are interpretted to be caused by the sudden shape change based on the deformed independent particle model (DIPM) calculation. (author)

[en] Recently the requirements for the experimental data on the response characteristics of neutron detector and the cross section for neutron generation by charged particles have been increasing for shield designing. Here, a system for quasi-monochromatic neutron generation was developed in the facility of ring-cyclotron in Institute of Physical and Chemical Sciences. In this study, H₂⁺ accelerated to an energy range of 80-135 MeV/n and P⁺ to 150-210 MeV was irradiated to E4 beam course and NE102A plastic scintillator was used for monitoring the neutron flux. The amount of neutrons generated was estimated from the radioactivity of ⁷Be produced in ⁷Li-target. The neutron spectres thus estimated as an energy range of 80-210 MeV were presented and the lower limit of these spectres was about 20 MeV. The peaks in the range of 150 and 210 MeV were comparatively wide because of the inferiority of energy resolving power at a higher energy level. (M.N.)

[en] We described nucleon as the solutions of Faddeev equation of three-body system for the Nanbu-Jona-Lasinio (NJL) model. The object of this work is formulation of matrix element of single-body operator and calculation on the basis of it in order to investigate the physical properties of the solutions. A static approximation was made. Parameters were determined so as to reproduce the mass of π-meson and nucleon and the decay constant. There was small difference between the distribution of mean square radius of μ and d quark.In fact, these values in the nucleon were <γ_d²>_n=0.783{fm²} and <γ_u²>_n=0.666{fm²} at Mg=400{MeV}. The results of the magnetic momentum μn was smaller than that of the experimental values. It may be given as a conclusion that description of baryon by means of the relativistic Faddeev equation makes reproduce the mass spectra and gives appropriate physical static properties. Faddeev method is the best one to describe the relativistic three-body bound system, nucleon, at the present stage and it was supported by this work. (S.Y.)

[en] We study the feasibility of using the (K^-, η) reaction as a new tool for producing Λ-hypernuclei. We compare the characteristics of the (K^-, η) reaction with those of the (K^-, π) and (π⁺, K⁺) reactions and calculate the production cross sections for the ¹²C(K^-, η)_Λ¹²B reaction. Preliminary results of a test run at BNL to measure the (π^-, η) and the (K^-, η) reactions are presented. (author)

[en] At the intermediate energy scale, we have a so called constituent quark picture of hadrons, where a hadron is a bound state of constituent quarks. This simple picture can reproduce the mass spectrum and the electro-magnetic properties of hadrons. Beside this, weak decays of hyperons or strange mesons are the processes at intermediate energy, and are understood in a such model. Hypernuclear decays are also the process at intermediate energy scale. Therefore, we would be able to reproduce this process in the constituent quark picture, if the picture is really reliable. There are two decay modes, one is a π-mesonic decay and another is a non-mesonic decay. The microscopic process of π mesonic decay is Λ → Nπ, which is the dominant decay mode of free Λ. On the other hand, microscopic process of the non-mesonic decay is believed to be the two body ΛN → NN process. This is a induced decay and a new type of weak interaction of hadron, two baryon weak interaction. Two baryon weak interaction is very interesting because it is not sutudied well, and might reveal the strong interaction effect to weak process. In this paper we study this new type of weak interaction, ΛN → NN, in a constituent quark picture by studing the non-mesonic decay of light hypernuclei. Because, for light hypernuclei, there are some experimental data of non-mesonic decay and new data is accumulating. (J.P.N.)

[en] Pionic-decay spectra are discussed in A=4 and 5 Λ-hypernuclei by using wave-functions obtained by the resonating group method. For _Λ⁵He, the π^--spectrum shows a sharp peak at 171 MeV with 1.5 MeV FWHM in the total pion energy. For _Λ⁴H and _Λ⁴He, the spectra have broad peaks around 170 MeV with 6-7 MeV FWHM. This difference is caused by resonance structures of the final-state nuclei under the spin-non-flip dominance in the pionic decay. Partial decay widths are calculated to check the normalization of the spectra, and are in systematically good agreement with all available experimental data. The pionic weak-decay of _ΛΛ⁵H is also investigated to show the feasibility of the nuclear identification by using monoenergetic decay pions. (author)

No abstract available