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Article type: Cover
1994 Volume 90 Issue 1 Pages
Cover1-
Published: October 20, 1994
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Article type: Appendix
1994 Volume 90 Issue 1 Pages
App1-
Published: October 20, 1994
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Article type: Appendix
1994 Volume 90 Issue 1 Pages
A1-
Published: October 20, 1994
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[in Japanese]
Article type: Article
1994 Volume 90 Issue 1 Pages
A2-A10
Published: October 20, 1994
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K. Hagino, N. Takigawa, M. Abe
Article type: Article
1994 Volume 90 Issue 1 Pages
A11-A18
Published: October 20, 1994
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We discuss non-adiabatic effects in macroscopic quantum tunneling. We formulate deviations from the adiabatic limit in terms of an increase of the mass of the tunneling motion or a decrease of the norm of the environmental space. We apply the latter method to discuss the effects of a nuclear intrinsic excitation on the fission rate of ^<234>U. We also compare the result with that obtained by the Schmid method, where the fission is treated as a quantum tunneling in a two dimensional space.
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A.B. Balantekin, J.R. Bennett, S. Kuyucak
Article type: Article
1994 Volume 90 Issue 1 Pages
A19-A24
Published: October 20, 1994
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Recent accurate measurements of fusion cross sections at subbarrier energies have enabled extraction of barrier distributions which could provide a novel test for collective models. Data on angular momentum transfer also constrain models of subbarrier fusion. We have carried out a systematic study of subbarrier fusion of ^<16>O with some rare earth nuclei using a scheme which incorporates the Interacting Boson Model for nuclear structure effects. The existing fusion cross section, barrier distribution and average angular momentum data are fitted with a consistent set of parameters. The coupling strengths determined from fitting the subbarrier fusion data are compared with those found in Coulomb excitation.
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[in Japanese]
Article type: Article
1994 Volume 90 Issue 1 Pages
A25-A26
Published: October 20, 1994
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A. Ohnishi, J. Randrupt
Article type: Article
1994 Volume 90 Issue 1 Pages
A27-A34
Published: October 20, 1994
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We develop a microscopic statistical model based on wave packet wave functions which are commonly used in the microscopic transport models. Under an assumption that each wave packet should have energy distribution of Poisson type, we show that the canonical statistical weight can be calculated correctly enough to describe the transition from liquid-like phase to the gas-like phase in finite nuclei. For an application, we have studied the statistical properties of ^<12>C and ^<40>Ca , and the calculated results show that the standard liquid drop model results are reproduced at low temperatures, while at higher temperatures the system behaves as free nucleon gas. When the volume in which statistical equilibrium is achieved becomes sufficiently large, multifragmentation is shown to appear.
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[in Japanese]
Article type: Article
1994 Volume 90 Issue 1 Pages
A35-A40
Published: October 20, 1994
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M. Abe
Article type: Article
1994 Volume 90 Issue 1 Pages
A41-
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[in Japanese]
Article type: Article
1994 Volume 90 Issue 1 Pages
A42-A48
Published: October 20, 1994
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The physical content of the giant resonance(GR) width is nivestigated based on the fully microscopic theory [i.e. the thermal RPA(TRPA) on top of the thermal HFB(THFB)]. The experimental FWHM is interpreted as the total width obtained by folding both strength distributions with the fragmentation width due to the p-h RPA states, Γ_f, and the spreading width due to the 2p-2h states, Γ^↓. In the high temperature limit, the temperature-dependence of these widths are estimated as Γ_f α(kT)^<-3/2> and Γ^↓ α(kT)^<-3/2>, which indicate that the saturation of the width takes place at moderately high tempetatures before the occurence of the motional narrowing of the GDR width expected at very high temperatures. Usefulness of the microscopic treatment is demonstrated also in the calculation of the anisotropy coefficient of gamma-ray angular distribution from the decay of the GDR built on the hot rotating nucleus. It is stressed that fluctuation of physical quantities can be correctly calculated within the framework of mean field approximation for microscopic theory.
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1994 Volume 90 Issue 1 Pages
A49-A51
Published: October 20, 1994
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[in Japanese], [in Japanese]
Article type: Article
1994 Volume 90 Issue 1 Pages
A52-
Published: October 20, 1994
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David Boilley, Yasuhisa Abe, Sakir Ayik, Eric Suraud
Article type: Article
1994 Volume 90 Issue 1 Pages
A53-A66
Published: October 20, 1994
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Starting from Boltzmann-Langevin equation and performing a fluid dynamical reduction, a system of coupled Langevin equations is derived for a multipolar velocity field. This system is then applied to β-, γ-quadrupole resonances, making a link between microscopic approaches and phenomenological macroscopic ones. The validity of the markovian approximation made in the Boltzmann equation's collision term is discussed and some memory dependent two-body damping widths are calculated.
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Article type: Appendix
1994 Volume 90 Issue 1 Pages
A67-A68
Published: October 20, 1994
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[in Japanese]
Article type: Article
1994 Volume 90 Issue 1 Pages
A69-A70
Published: October 20, 1994
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Article type: Appendix
1994 Volume 90 Issue 1 Pages
A71-A75
Published: October 20, 1994
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1994 Volume 90 Issue 1 Pages
1-9
Published: October 20, 1994
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Article type: Appendix
1994 Volume 90 Issue 1 Pages
11-35
Published: October 20, 1994
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Article type: Appendix
1994 Volume 90 Issue 1 Pages
App2-
Published: October 20, 1994
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Article type: Appendix
1994 Volume 90 Issue 1 Pages
App3-
Published: October 20, 1994
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Article type: Cover
1994 Volume 90 Issue 1 Pages
Cover2-
Published: October 20, 1994
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Article type: Cover
1994 Volume 90 Issue 1 Pages
Cover3-
Published: October 20, 1994
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