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         List of seminars from October 2000 to March 2001
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Lecturer: V. Zagrebaev
          (JINR, Dubna)
Title: Exploration of multi-neutron halos in 6,8He
       induced low-energy transfer reactions.


Date:   2001/03/13 (Tue.) 15:00 -
Place:  RIKEN Main Bldg. 2F Seminar Room
                           The seminar will be given in English.

Abstract:
In the talk the lessons derived from low-energy experiments with
6He are highlighted and expectations related to the 8He beam are
discussed. Three-dimensional four-body model is developed to describe
nuclear reactions induced by weekly bound halo nuclei. Low-energy
few-neutron transfer reactions with Borromean nuclei are shown to
be an effective instrument for studying both the structure of such
nuclei and the dynamics of nuclear reactions with their participation.
In the case of 6He, a realistic 3-body bound state wave function is
used in the calculations and the role of its spatial localization,
in particular, the di-neutron configuration, is thoroughly studied.
Possible further physics research with 6,8He beams at low energies
are discussed, including elastic scattering, fusion processes,
reactions of few-neutron transfer, and low-energy fragmentation.
Advantages of using tritium target are also discussed.
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Lecturer: G. DO DANG
          (Laboratoire de Physique Theorique,
	   Universite de Paris-Sud, ORSAY, France)
Title:  DISSIPATION OF A SLOW MOTION BY A COMPLEX SYSTEM :
        A RANDOM MATRIX APPROACH
Date:   2001/3/9 (Fri.) 16:00 - 
Place:  RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.

Abstract:
We wish to develop a formalism to study the generic problem of
diffusion and dissipation of a slow ( collective ) motion by a complex
quantum system. The general properties of the complex system is taken into
consideration through the use of ensembles of random matrices.

We derive in the high temperature limit an evolution equation for
the density matrix of the slow motion and show that it reduces to the
classical Kramers equation in the semi-classical limit. Other properties of
this equation are also studied. Among other things, we show how it gives rise
to turbulent diffusion in a linear potential as well as fractional kinetic
equation. Possible applications are suggested, in particular, in  the study
of nuclear fusion and fission as well as in quantum dots.
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Lecturer: Prof. K. Hikasa
          (Tohoku Univ.)
Title:  Old and new physics vs (g-2)_\mu
Date:   2001/2/14 (Wed.) 15:00 - 
Place:  RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.

Abstract:
After a brief review of the present theoretical status 
of the muon anomalous moment in QED, possible new physics 
contributions including supersymmetry and extra dimensions are 
discussed. 
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Lecturer: Gerry Bunce
          (Brookhaven National Lab. / 
	RIKEN BNL Research Center)
Title:  Precise Measurement of the Positive Muon Anomalous Magnetic
Moment.
Date:   2001/2/14 (Wed.) 13:30 - 
Place:  RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.

Abstract:
Precise measurement of the anomalous g-value a = (g-2)/2 of the muon
provides a sensitive test of the standard model of particle physics and
new information on speculative theories beyond the standard model. The
results of the analysis of the data collected in 1999 from AGS E821 will
be presented. This result has an error one third that of the combined
previous measurements.
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Lecturer: Teng-Lek Khoo
          (Argonne National Laboratory, USA)
Title:  At the Limits of Nuclear Charge, Spin and Energy with Heavy
        Shell-stablilized Nuclei.
Date:   2001/1/15 (Mon.) 15:00 - 
Place:  RIKEN Main Bldg. 2F Seminar Room
                           The seminar will be given in English.

Comment:
The same topic is partly covered at the RIKEN Winter School (Jan. 8 - 13,
2001). If the major part of audience is overlapped with participants in
the winter school, the subject may be changed into:
     "Survey of decay out of superdeformed bands"
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Lecturer: 長谷川祐司
          (Atominstitut, Wien, AUSTRIA)
Title: 干渉実験から見た量子力学
Date:   2000/12/28 (Thu.) 16:30 - 
Place:  RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in Japanese.

Abstract:
　最近、巨大分子のドブロイ波による干渉が観測されたり、量子コンピュータを
はじめ量子情報技術の開発も進められ、量子物理学の分野が注目されつつありま
す。Ｘ線や中性子の干渉実験で量子物理学の分野をみると、どのような現象が観
測できるのでしょうか？
  まず、光子が吸収・放出過程においても干渉性を保持し、位相情報の伝達しう
ることを示した実験を紹介します。この実験の結果を「シュレディンガーの猫」
や「観測の理論」と合わせて議論したいと思います。次に、量子力学の根本原理
である不確定性原理の元である演算子の非交換関係を中性子のスピンを用いて示
した実験を紹介します。具体的には偏向解析装置を用いてパウリのスピン演算子
の非交換関係を実証しています。ここで示された非交換関係を、エネルギーに依
存せず系の発展経路にのみ依存する、幾何学的位相と関連して議論したいと思い
ます。さらに、量子力学的な重ね合わせを利用した、両立しないオブザーバブル
の測定実験を、中性子のスピンの２成分の測定を例に取り、紹介したいと思います。
  時間が許せば、スピンに関与しない、二重スリット実験内での幾何学的位相や、
偏極中性子を用いた非対角要素による幾何学的位相の観測実験も紹介したいと思
います。
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Date:   2000/12/28 (Thu.) 15:00 - 
Lecturer: Peter Moller
          (Los Alamos National Laboratory)
Title: New Results from Calculations of Fission and Fusion Barriers in 
       Five-Dimensional, Multi-Million-Grid-Point Deformation Spaces
Place:    RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.
 I report results of our fission studies in very large 
five-dimensional deformation spaces.  I have  
systematically applied the method to the calculations of
fission barriers all the way from about A = 70 to the heaviest elements
and also to the calculation of FUSION barriers for the
formation of superheavy elements and obtained new and more
complete results. We also get extremely good results in our
calculations of the mass asymmetry of fission.  I will 
present a review of these results and  be available to discuss 
these calculations.
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Date:   2000/12/11 (Mon.) 16:00 - 
Lecturer: A.I. Malakhov (JINR 高エネルギー研究所長)
Title: Some results and research program of Laboratory 
       of High Energies (JINR, Dubna)
Place:    RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.
  Recent results and research program of the Laboratory of High Energies
(JINR) will be reported. The main attention will be paid to the first 
experiments proposed for the new superconductive accelerator NUCLOTRON.
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Date:   2000/12/11 (Mon.) 14:30 - 
Lecturer: Alexander P. Kobushkin 
          (Bogolyubov Institute for Theoretical Physics, Ukraine
           現在RCNPのvisiting senior researcher)
Title: Deuteron spin structure at short distances from 
       experiments with polarized deuteron beams
Place:    RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.
 A systematic analysis of the differential cross section, the
tensor analyzing power, $T_{20}$, and the polarization transfer,
$\kappa_0$, in $0^{\circ}$ inclusive $A(d,p)$ breakup at relativistic
energy is provided. The analysis includes relativistic impulse
approximation, Glauber rescattering effects and takes into account 
the  Pauli principle at level of constituent quarks in the
deuteron. It is shown that all this effects  are important to explain
existed data. Some open questions connected with further study of
lightest nuclei ($^3He$ and $^4He$) at short distances are discussed.
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Date:     2000/11/27 (Mon.) 16:00-
Lecturer: Hiroyuki Koura (Waseda University)
Title: 新しい質量公式とそれから予測される不安定原子核の性質
Place:    RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in Japanese.
　原子質量は原子核の持つ最も基本的な量であって，質量とエネルギーの
同等性のために原子のもつ全エネルギーでもあり，またそれゆえに，原子核
の安定性を決定し，その崩壊を支配し，反応の起こりやすさに決定的な影響
をもっている。これまで多くの研究者によって約2500種の原子核が実験的に
確認されてきている。ところが理論的には，それ以外に何千種類もの原子核
が存在しうるという予測がある。こうした原子核の性質を知ろうとする場合，
まず問題にしなければならないのが原子質量であり，原子質量公式はそれを 
理論的に予測する手段となる。
　今回のセミナーでは，我々のグループが最近作成した原子質量公式を解説
する。そしてそれから予測される不安定原子核の性質について他の質量公式
と比較しながら示す。特に重核および超重核の崩壊を中心に調べ，なかでも
α崩壊については，他の予測値や最近の実験値との比較をしながら，ある程
度定量的な議論を行う。自発核分裂については変形度に対するenergy surface
を示して議論を行う。また，他の領域については，中性子過剰核の性質（主に
魔法数，ドリップライン）について簡単に触れる予定である。
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Date:     2000/11/9 (Thu.) 15:00-
Lecturer: Mikhail Zhukov (Chalmers University of Technology, Sweden)
Title: Can we discuss a proton halo in 8B ?
Place:    RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.

Abstract:
The 8B nucleus was intensively studied during last years both 
theoretically and experimentally due to its important role in our
understanding of the nucleosynthesis and the Solar boron neutrino
problem. The 8B nucleus is also interesting as a first candidate
among light proton dripline nuclei, which can possess a proton halo
in the ground state. In this report we discuss the property of 8B
within the extended three-body model, which take into account
peculiarities of both two- and three-body dynamics. We compare our
results with available theoretical and experimental data. From
this comparison and our results we have a clear indications of the
proton halo (or skin) in 8B.
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Date:     2000/11/6 (Mon.) 14:30-
Lecturer: Ch. Stoyanov (Institute for Nuclear Research and Nuclear Energy,
                        Bulgaria)
Title: Microscopic Description of Newly Discovered Mixed Symmetry States
Place:    RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.

Abstract:
The properties of low-lying states in $^{136}$Ba,  $^{144}$Nd and $^{94}$Mo
are investigated within the quasiparticle phonon model. It is shown that the
strong quadrupole interaction in the particle-particle channel
leads to the appearance of low-lying isovector excitations. Two
branches, an isoscalar and an isovector ones, are thus observed
in the low-energy sector of the spectrum.
Both branches show peculiar  regularities
in the E2 and M1 transitions.
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Date:     2000/10/25 (Wed.) 15:00-
Lecturer: Junji Tojo (Department of Physics, Kyoto University)
Title: Measurement of the Analyzing Power for Proton-Carbon
       Elastic Scattering in the Coulomb-Nuclear Interference Region
       with a 22 GeV/c Polarized Proton Beam
Place:    RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.

Abstract:
We will report the first measurement of the analyzing power
for the proton-Carbon elastic scattering in the Coulomb-Nuclear interference
(CNI) region at 22 GeV/c. The experiment was carried
out in March 1999 by the collaboration of the BNL-AGS E950.
  The analyzing power originates from the interference between
the spin-flip amplitude of electro-magnetic interaction and the
spin-nonflip amplitude of hadronic interaction in the momentum
transfer squared 10^{-3}<-t<10^{-2} (GeV/c)^{2}. Theories predict
the analyzing power has a maximum of about 4% and decreases
with -t.
  The theoretical predictions, our experimental method, results
and the application to a high energy proton polarimetry for RHIC
polarized collider will be discussed.
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Date:     2000/10/11 (Wed.) 15:00-
Lecturer: Prof. Yu.A. Plis (Joint Institute for Nuclear Research, DUBNA)
Title: The new possibilities for polarized ion beam production
Place:    RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.
Abstract:
The feasibility of new using of known Kaminsky's method 
for polarized ion beam production by an ion pick-up of a polarized electron
from a magnetized Ni single crystal foil is considered.
The results of computer calculations are given.
The production of polarized beam by a laser interaction
with a polarized target is discussed.
Also, there is an interesting possibility connected with interaction
of polarized laser light with matter.
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Date:     2000/10/4 (Wed.) 15:00-
Lecturer: Shen WenQing (Shanghai Institute of Nuclear Research, 
          Chinese academy of Science)
Title: Program for RIB Physics and nuclear astrophysics in china and 
       Preliminary plan of Shanghai Laser Electron Gamma Source
Place:    RIKEN Main Bldg. 2F Seminar Room
                           The seminar will be given in English.
Abstract:
The brief introduction for Major State Basic Research Development Program 
in China and program for RIB Physics and Nuclear Astrophysics will be given. 
The preliminary plan of Shanghai Laser Electron Gamma Source on the planned 
Shanghai Synchrotron Radiation Facility will be described briefly also.
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Date:     2000/10/2 (Mon.) 15:00-
Lecturer: Pradip Kumar Sahu (Division of Physics, Hokkaido University)
Title: Nuclear equation of state and its aplication to heavy-ion collisions 
       and neutron star
Place:    RIKEN Main Bldg. 1F Seminar Room
                           The seminar will be given in English.
Abstract:
The nuclear equation of state is still an unsettled issue 
though many experimental and theoretical efforts have been 
made in last decade. Experimentally, the baryon sideward 
flow and elliptic flow are the most promising observables. 
Recently the flow has been measured for heavy-ion collisions 
at AGS energies in $Au+Au$ systems, which provides further 
constraints on the hadronic models and the EOS employed.

We fix the explicit momentum dependent of the nucleon-meson
couplings within the relativistic model by the nucleon optical
potential up to 1 GeV of kinetic energy.
In this work, in a relativistic transport model, we performed
a systematic study of $Au + Au$ collisions in comparison to the 
recent experimental data on the collective flow of baryons at 
SIS to AGS energy regime.

In the second part, we calculate the nuclear equation of state 
by using the same dynamic momentum dependence constraints in 
the nuclear potentials and then employ to the neutron star 
structure calculations, where the composition of the particles 
are hyperons along with neutrons, protons and leptons.

Since the interaction between hyperon-nucleon and hyperon-
hyperon are not know very well, we vary the ratio of hyperon-
meson and nucleon-meson couplings from the analysis of
various experimental data on hypernuclei at KEK.

Finally, we discuss the appearance of hyperons with density,
the maximum mass of neutron star with recent observational 
value.
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