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Article type: Cover
1991 Volume 83 Issue 5 Pages
Cover1-
Published: August 20, 1991
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Article type: Appendix
1991 Volume 83 Issue 5 Pages
App1-
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Article type: Appendix
1991 Volume 83 Issue 5 Pages
E1-E2
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S. M. Lee, T. Nakagawa, K. Yuasa-Nakagawa, Y. H. Pu, S. C. Jeong, H. F ...
Article type: Article
1991 Volume 83 Issue 5 Pages
E3-E14
Published: August 20, 1991
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In order to investigate the reaction mechanisms of Intermediate Mass Pragments(IMF) as well as Fission Products(FP) from a highly excited compound nucleus, we have carried out the experiment using the RIKEN Ring Cyclotron for ^<84>Kr+^<27> Al at 10.6 MeV/u in which the complete fusion is still dominant. The distributions of nuclear element Z and its isotope mass are analyzed extensively in terms of Extended Hauser Feshbach Method(EHFM) and it is concluded that the sequential decay is playing an important role in accounting for those distributions and the fully equilibrated compound states of ^<111>In at 〜 200 MeV do exist with the angular momentum state of 83 ± 7h above the limit of rotating liquid drop model of 68h. A large difference observed in the previous experimental Z-distributions for ^<84>Kr+^<27>Al at 5.83 MeV/u and ^3He+Ag at 30 MeV/u, which form the nearly same compound nucleus In at 〜 100 MeV, is interpreted consistently in terms of EHFM as being due to the effect of angular momentum windows involved.
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1991 Volume 83 Issue 5 Pages
E15-E16
Published: August 20, 1991
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[in Japanese], [in Japanese], N. Carjan
Article type: Article
1991 Volume 83 Issue 5 Pages
E17-E21
Published: August 20, 1991
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Koichiro Asahi
Article type: Article
1991 Volume 83 Issue 5 Pages
E22-E30
Published: August 20, 1991
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E31-E35
Published: August 20, 1991
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[in Japanese], [in Japanese], S. Huang, A. Faessler, J. Aichelin
Article type: Article
1991 Volume 83 Issue 5 Pages
E36-E40
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E41-E42
Published: August 20, 1991
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E43-E47
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E48-E53
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Akira Ohnishi
Article type: Article
1991 Volume 83 Issue 5 Pages
E54-E59
Published: August 20, 1991
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Collective kinetic energy in the heavy ion collision process -especially in deep-inelastic collision process- is studied by the use of Quantum Molecular Dynamics. A new method to define the collective kinetic energy is proposed and applied to estimate the rotational and vibrational energy of fragments. The contributions of these collective motions of fragments to the energy loss are calculated to be about 20 〜 30 MeV in ^<16>O+^<93>Nb (204 MeV) reaction.
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Noriyo Kanayama
Article type: Article
1991 Volume 83 Issue 5 Pages
E60-E66
Published: August 20, 1991
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Masayuki Matsuo
Article type: Article
1991 Volume 83 Issue 5 Pages
E67-
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M. OHTA, Y. ABE
Article type: Article
1991 Volume 83 Issue 5 Pages
E68-E73
Published: August 20, 1991
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The critical temperature of the compound nucleus beyond which the residual nuclei heat up by cluster emissions are presented in the framework of the modified Weisskopf model in which the complete fusion reaction cross section is used as the inverse reaction one. The low critical temperature for tightly bound cluster emission indicates a possible additional problem on the fluctuation of the nuclear mean field at high excitation energies.
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Koji Nitta
Article type: Article
1991 Volume 83 Issue 5 Pages
E74-E83
Published: August 20, 1991
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We have analysed subthreshold pion production on the basis of the VUU transport theory and the incoherent production mechanism with free production rates. Within the semi classical VUU formulation we have taken into account the high momentum components as described by HF ground state momentum distributions on the mean-field level by introducing a Gaussian discretization in momentum space for the one-body phase-space distribution f(r,p;t). It should be noticed that the high momentum components described above are not a direct result of short range correlations nor of many-body correlations beyond the mean field level, but a consequene of the many-body effects through the mean field and the effective interaction. Therefore their inclusion does not contradict the VUU description and the incoherent treatment of particle production. The present results with the high momentum components show a remarkable agreement with the data for and the angle integrated energy spectra of π^<0'>s in the laboratory frame down to 44 MeV/u. They also reproduce well the recent data of the invariant energy spectrum of π^^- at 95° in the NN center-of-mass frame from ^<14>N + ^<12>C at 42 MeV/u incident beam energy. Furthermore, the exponential slope parameter of π^- spectra at 90° in the center-of-mass frame is analyzed over a wide range of beam energy. Our results follow well the anomalous behaviour of the experimenta data, i.e. the slope parameter decreases monotonically with beam energy down to around 100 MeV/u and turns to be flat below 100 MeV/u. Since this anomalous behaviour can be easily understood in our model based on the basic dynamical effects of nucleus-nucleus collisions in this energy region, the general trend of the slope parameter obtained in the present study may not be wiped out by the more detailed analysis including the dynamical treatment of the pion reabsoption, the medium effects, or the momentum dependent force. Though the experimental trend is not so clear due to the large error bars for T_<0'>, this anomalous slope parameter might be an additional clear evidence for the incoherent production mechanism for pions in nucleus-nucleus collisions above 40 MeV/u: The slope parameter for π^0 angle-integrated energy spectrum in the laboratory frame as obtained in the cooperative model does not show the anomaly but monotonically decreases below 100 MeV/u. The experimetal situation will become more clear by forthcoming new measurements.
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E84-E87
Published: August 20, 1991
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Masanobu Yahiro
Article type: Article
1991 Volume 83 Issue 5 Pages
E88-E97
Published: August 20, 1991
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An adiabatic perturbation theory proposed is an extension of the adiabatic approximation of Johnson and Soper to treat projectile breakup, and as accurate as the method of continuum discretized coupled-channels. An equation for the total wave function is derived in two ways, one based on the adiabatic theorem and the other on the adiabatic approximation. A quantity first discussed by Berry on its geometrical properties appears in all orders of the perturbation, but it never becomes a geometrical quantity such as Berry's phase because of no diabolic point in parameter space. Discussions are made on whether a kernel of the equation is of L^2 type. The resultant expansion of the total wave function has wrong asymptotic forms, so a new expansion is derived from the old one. An approximate but practical way of calculating the new expansion is proposed for deuteron induced reactions.
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E98-E104
Published: August 20, 1991
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Yuichi Yamamoto, Toshitaka Kajino, Ken-ichi Kubo
Article type: Article
1991 Volume 83 Issue 5 Pages
E105-E123
Published: August 20, 1991
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The direct reaction cross section for ^7Li(^3H, n)^9Be at low energies 0 MeV ≦ E_<cm> ≦ 2 MeV of astrophysical interest was calculated in the nuclear models of distorted- wave Born approximation. Nuclear potentials and spectroscopic amplitudes were determined from the observed cross section for ^7Li(^3He, p)^9Be, assuming charge independence of these quantities. We predict the total reaction cross section for ^7Li(^3H, n)^9Be by taking account of the difference of Coulomb interaction and the contribution from compound resonance formation. They were applied to primordial nucleosynthesis calculations and it was confirmed that the nuclear reaction ^7Li(^3H, n)^9Be can extremely enhance the ^9Be abundance in inhomogeneous models for primordial nucleosynthesis as predicted in recent theoretical studies.
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N. Takigawa
Article type: Article
1991 Volume 83 Issue 5 Pages
E124-E131
Published: August 20, 1991
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I discuss a few characteristics of heavy ion collisions involving strongly deformed targets. I offer a novel interpretation for the large deviation of the elastic scattering angular distribution from the standard Fresnel pattern based on a geometric scattering theory. I then discuss characteristics of the dynamic polarization potential (DPP) associated with the Coulomb excitation of the ground state rotational band. In particular, I show that there exist two phase equivalent DPP's that have very different behaviour in the r- and L- spaces. Also, I present a recipe for approximately correcting the deficiencies of the geometric scattering approach, which tends to overemphasize the effects of Coulomb coupling.
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H. J. Kim
Article type: Article
1991 Volume 83 Issue 5 Pages
E132-E137
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E138-E140
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E141-E148
Published: August 20, 1991
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Article type: Appendix
1991 Volume 83 Issue 5 Pages
E149-E150
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E151-E152
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E153-E155
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E156-E159
Published: August 20, 1991
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E160-E163
Published: August 20, 1991
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E164-E167
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E168-E170
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E171-E173
Published: August 20, 1991
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Tamio IKEHASHI, Koichi OHTA
Article type: Article
1991 Volume 83 Issue 5 Pages
E174-E177
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E178-E181
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E182-E185
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E186-E189
Published: August 20, 1991
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K. Kobayakawa, T. Morii, S. Tanaka, T. Yamanishi
Article type: Article
1991 Volume 83 Issue 5 Pages
E190-E194
Published: August 20, 1991
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The spin-dependent distribution functions of quarks and gluons in a proton are studied so as to explain EMC g^p_1(x) data by introducing a new model based on Carlitz-Kaur model. It is shown that polarized gluons through the anomaly play a significant role and consequently the sum of quark spins is nearly equal to 1/2.
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T. HATSUDA
Article type: Article
1991 Volume 83 Issue 5 Pages
E195-E198
Published: August 20, 1991
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Origin of the small g^0_A (the flavor-singlet axial charge of the nucleon) is discussed from the several viewpoints. It is shown that the pseudo-scalar glueballs and the gluonic ghost coupled to FF^^〜 do not reduce the value of g^0_A in the tree level. Some other effects on g^0_A such as the instanton and the semi-perturbative gluons are examined.
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E199-E202
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E203-E206
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
E207-E210
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
197-204
Published: August 20, 1991
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[in Japanese]
Article type: Article
1991 Volume 83 Issue 5 Pages
205-208
Published: August 20, 1991
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Article type: Appendix
1991 Volume 83 Issue 5 Pages
App2-
Published: August 20, 1991
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Article type: Cover
1991 Volume 83 Issue 5 Pages
Cover2-
Published: August 20, 1991
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Article type: Cover
1991 Volume 83 Issue 5 Pages
Cover3-
Published: August 20, 1991
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