No abstract available

[en] Hyperfine interactions of substitutional and interstitial impurities in crystals were studied by use of the asymmetric β decay and NMR detection, following recoil implantation. A new ISOL for the projectile fragments produced in relativistic heavy-ion reaction separated radioactive isotopes. Their high kinetic energies obtained in the reaction enabled us to create spin polarization artificially in the isotopes and to implant them deep in any material. (orig.)

[en] A new field, i.e., a huge part of new nuclear physics, can be efficiently opened up and be developed using those unstable nuclei that belong to high isospin families. Since those families will be produced most efficiently through nuclear reactions initiated with incident beams of the energy about 300 MeV/nucleon, the TARN II, or an accelerator equivalent to this, is urgently needed. Because of the high kinetic energy obtained in the reaction, it is easy to have them penetrate tilted foils to polarize in their nuclear spins, and to implant them in suitable stopping materials to keep them in a well defined place, which conditions are imperative for many experimental studies. Therefore, it is clear that, after the completion of the required tests and studies of the TARN II, this machine can be efficiently used for the above mentioned studies and the trainings of the young heavy-ion physicists. Such changes and enhancements of the original purposes of TARN II to those above mentioned are very important, and they are quite natural for our nuclear physics society, because, until the completion of the Exotic Nuclei Arenain the JAPAN HADRON PROJECT, physicists who have something to do with can play their physics to some extent to keep up their abilities and also to continue the education of the students in the nuclear physics society. (author)

[en] After the first study on the electric quadrupole interaction of light interstitial impurities in metallic crystals following nuclear reactions, by the pioneering studies for 20 years, recoil implantation technique has grown to one of the indispensable tools for the studies on solid state physics and nuclear physics. In this report, several examples in this field using β-NMR technique following nuclear reactions are described. The β-NMR technique in which the asymmetric β-ray distribution from spin-polarized β-emitters is detected has been efficiently used for the studies in the interdisciplinary area between nuclear and solid state physics. One of the main purposes of the present hyperfine interaction (HFI) studies on short-lived β-emitters is to investigate the electronic structures of the interstitial and substitutional impurities in metal crystals. In this report, the relaxation of lattices due to artificially implanted impurities is discussed. Some problems associated with the HFI of the inpurities in metallic crystals disclosed by ¹²B and ¹²N are discussed. Almost all unstable nuclei can be spin-polarized for future extensive HFI studies by using β-NMR. The locations of ¹²B and ¹²N in fcc and bcc metals, the lattice relaxation due to interstitial impurities, the unexpectedly small dipolar field in Fe crystals detected by ¹²B and the field gradients detected by the minority ¹²N in Mg are reported. (K.I.)

[en] In the nuclear map (plotting of the number of protons against the number of neutrons), exotic nuclei and high isospin nuclei stay far away from the stable region. These nuclei have been difficult to produce through conventional nuclear reactions using light ions. In the coming new age of nuclear science, unstable nuclei themselves will be accelerated to produce a beam (unstable isotope beam) and used to gain access to the exotic nuclei. The present article describes major features and advantages of the application of an unstable isotope beam to nuclear science, and then outlines the joint research project that has been performed by Osaka University in Japan and Laurence Berkeley Laboratory (LBL) in California. New facilities for use of low-energy unstable nuclei were established in LBL toward the end of 1986 to perform separation and collection of unstable nuclei and nuclear spin polarization spectroscopic studies by means of nuclear magnetic resonance of unstable nuclei. The joint research at LBL has been successful in producing unstable isotopes and transporting them in the form of a beam. (N.K.)

[en] This is a study report on the polarization phenomena of the projectile fragments produced by heavy ion reactions, and the beta decay of fragments. The experimental project by using heavy ions with the energy from 50 MeV/amu to 250 MeV/amu was designed. Construction of an angle-dispersion spectrograph for projectile fragments was proposed. This is a two-stage spectrograph. The first stage is a QQDQQ type separator, and the second stage is QDQD type. Estimation shows that Co-66 may be separated from the nuclei with mass of 65 and 67. The orientation of fragments can be measured by detecting beta-ray. The apparatus consists of a uniform field magnet, an energy absorber, a stopper, a RF coil and a beta-ray hodoscope. This system can be used for not only this purpose but also for the measurement of hyperfine structure. (Kato, T.)

[en] A method to create nuclear spin polarizations in unstable nuclides through high-energy heavy-ion collisions was introduced. Such polarizations are indispensable tool for the studies in which correlations between the polarization and out going radiations are detected. Of particular interests are to extract out clearly non nucleonic degrees of freedom from the studies of nuclear moments, and the coupling constants and time components of weak nuclear axial vector current. (author). 20 refs., 2 figs., 1 tab

[en] Possible experiments were discussed to study the renormalization of the coupling constants of the nucleon weak currents in the nuclear dynamics as well as the meson exchange effects in the time component of the main axial currents. Determination of the effective vector coupling constants g' sub(βv) is also proposed for mirror β-decays. (author)

[en] Applications of the unstable nuclear beam-technique to several investigations of materials were discussed in the material-science session. The production of unstable nuclides and the creation of their nuclear spin polarizations are the first step for such investigations in which correlations between the polarization and out going radiations are mainly detected. Several requirements to the RI beams produced from the JHF facilities are given. (author)

[en] Polarization phenomena in the nuclear reaction, the nuclear moments, the β decay and the hyperfine interaction which have been studied in the Van de Graaff Laboratory, Osaka University, were discussed. Short history of the laboratory was also reviewed. (author)