[en] The scope of the conference was intended to cover the recent development of theoretical and experimental works on the properties of weak interactions in nuclei and the nuclear structure problems. Topics included were; weak coupling constants from nuclear beta decay and muon capture, symmetry problems of weak interactions, double beta decay and neutrino mass, soliton stars, nuclear structure studied by weak interactions, properties of nuclei far from stability line, weak decay of hypernuclei, fundamental weak interaction and their related problems. The program of the conference consisted of 15 plenary sessions with 67 papers. The proceedings include the invited papers and contributed papers orally presented. Abstracts of contributed and invited papers were collected in a booklet distributed at the conference

[en] This paper reports on modern shell-model wave functions that predict relative Gamow-Teller (GT) strengths which agree well with experimental observations. It is essential that both spin-orbit partners of each orbital be included in the model vector space to obtain quantitative theoretical agreement with observations, since the spin-flip aspect of GT operator is dominant. This requirement on vector spaces has the practical effect of limiting quantitative analyses of Gamow-Teller decay with classical shell-model techniques to the p shell and sd shell, with only minor excursions into the fp shell. The authors restrict attention here to the sd shell

[en] In this paper the superallowed Fermi β-decay of ¹⁰C is studied by measuring the relative intensities of the 1022 and 718 keV γ-rays from the decay to the second excited (0⁺, T = 1) and first excited (1⁺) states of ¹⁰B. The decay branch to the 0⁺ state was obtained as 1.469 ± 0.006%

[en] Double beta decay of nuclei is an interesting problem which concerns with particle physics and nuclear physics. For example, the neutrinoless double beta decay (0νβ) provides a good test of the finite mass of the neutrino and the existence of the right-handed weak charge current. In most of the analysis of the experimental results, the conclusions derived strongly depend on the calculated nuclear matrix elements for the double beta process. Therefore, precise calculations of the matrix elements are highly desirable both for the 0νβ and 2νβ process. In this paper, the authors will point out some problems in standard methods of evaluating the nuclear matrix elements of the 2νβ decay and propose a new practical method. The method is applied to the ⁴⁸Ca to ⁴⁸Ti 2ν double beta decay

[en] For baryon spectroscopy, magnetic moments and weak interaction form factors provide valuable information, and the impressive amount of available experimental data on these quantities for the octet baryons invites detailed investigations. The authors of this paper have made extensive studies of the weak-interaction form factors and magnetic moments of the octet baryons within the framework of the volume-type cloudy-bag model (v-type CBM). The clouds of all octet mesons have been included. Furthermore, we have taken into account in a unified framework various effects that were so far only individually discussed in the literature. Thus, the gluonic effects, center-of-mass (CM0 corrections, and recoil corrections have been included). In this talk, after giving a brief summary of some salient features of the results, we discuss a very interesting application of our model to the problem of the spin content of nucleons

[en] This paper provides an algebraic description of collective nuclear motion. One of its most attractive features is the existence of three dynamic symmetries corresponding to subgroup chains of U(6) which contain the rotation group O(3). The U(5), SU(3) and O(6) dynamic symmetries correspond in the geometric collective model to the spherical vibrator, the axially symmetric rotor and the gamma-soft rotor respectively. It is the object of this paper to examine some properties of the O(6) dynamic symmetry and their manifestations in the region around A = 130. The authors also investigate the connexion to the rigid triaxial rotor and examine the gamma softness in the light of a very different model, viz. the cranking model

[en] Muon induced processes in hydrogen isotopes have been subject to comprehensive experimental and theoretical studies. In this paper, muon, catalyzed fusion μ(CF) in deuterium-tritium mixtures has been paid special attention because of the large number of fusion cycles that can be triggered by a single muon. Moreover the understanding of μCF is an essential prerequisite for the interpretation of μ capture experiments. The starting point of the experimental program was the investigation of μ induced processes in pure deuterium, one of the main goals being the study of interaction process μ + d → n + n + μ_μ

[en] Recent suggestions of a fifth force have stimulated many experiments to search for macroscopic interactions arising from the exchange of ultra-low mass gauge bosons. The experiments fall into two categories: searches for violation of the inverse square law or of the universality of free fall. In this paper, the principles of these experiments are described and their results are summarized. Because some groups claim positive effects considerably larger than the upper limits established by others, subtle systematic errors that could masquerade as a fifth force are briefly discussed

[en] In this paper, the author would like to discuss what is double beta decay; why there is interest in double beta decay; and what information can be obtained from it

[en] The rare muon absorption mode A(Z)(μ^-, v_μγ)A(Z - 1) is but one example for a radiative process, in which additional information hidden in the more abundant parent process, in this case ordinary muon capture A(Z)μ^-, v_μA(Z - 1) can be obtained. The common bremsstrahlung of the external charges contributes little to the high energy part of the photon spectrum. The principal source of radiation here is the intermediate pion, which is exchanged between the hadronic unclear vertex and the lepton pair. The yield and the angular distribution with respect to the muon spin are therefore governed by the strength of the induced pseudoscalar coupling (g_p), which is also mediated by the pionic current. Since the present understanding of this coupling is limited for free as well as for bound nucleons, radiative muon capture experiments continue to be justified. The inherent difficulty of these experiments caused by low yield and adverse background conditions has restricted until recently the experiments to ⁴⁰Ca, a few heavy nuclei, and very limited information for light systems. The comparison of the theoretical predictions with data for nuclei with A ≥ 40 indicates a strong quenching of g_p compared to the albeit imprecise nucleonic value g_p/g_a = 7.0 ± 1.5. However, the interpretation of these results, which for ⁴⁰Ca are confirmed by four experiments, has been met with criticism because the nuclear models used tend to describe the final states in a rather global way, but are needed since the data give only an integrated yield. With the new data on ¹⁸O we are now in a more favorable situation