Quantum Monte Carlo Lattice Calculation of Thermal Properties of
Ryoichi Seki
Dept. of Physics and Astronomy, California State University,Quantum Monte Carlo Lattice Calculation of Thermal Properties of20051115Thermal properties of low-density neutron matter are investigated bynuclear many-body calculationon three-dimensional cubic lattice. Determinantal quantum Monte Carlocalculations are carried outfor the Hamiltonian determined by the use of the method of effective fieldtheory. The investigationis an ongoing project, and an overview of the project will be presented,including its future prospects.The present finding will be also discussed on thermal properties ofneutron-neutron correlationsin very low density neutron matter: a phase transition from a superfluidstate to normal,through a crossover region of Bose-Einstein condensation.Bogolyubov Institute for Theoretical Physics Kiev, UkraineElastic electron-nucleon scattering beyond one-photon exchange20051014We discuss the present situation in precision experimental study of elasticelectron-nucleon scattering, which give information about effects beyond theone-photon exchange. Such a study is important to get reliable informationon the nucleon structure at short distances. Special interest is connectedwith study of one-particle polarization observables, the beam and targetspin asymmetry. This quantities disappear in the one-photon exchange andthus give a direct information on the two-photon exchange inelectron-nucleon scattering. We give predictions for the target asymmetryand compare our theoretical results for the beam asymmetry with experimentin the resonance region (electron laboratory energy up to few GeV). Wediscuss role of large logarithms, $|n^2(Q^2/m^2)$ and $|n(Q^2/m^2)$ (where$m$ is the electron mass and -$Q^2$ is the momentum transfer squared), whichenhance the beam spin asymmetry.松崎 昌之Nuclear wobbling motion and related topics20050722Tieshan WangLanzhou UniversityInvestigation of the highly charged ion impact on solid surface20050714原子核理学研究施設会議室 （核理研研究棟３階）Khin Swe MyintStructure and Decay of Tightly Bound K^-NN three-body Kanonic Nucleus20050715Recent experiments at KEK [1,2] show distinct narrow peaks in the reactions He(stopped K^-,N)NNNK, which correspond to strange tribaryons S^0(3115) and S^1(3140) respectively. These are theoretically predicted and claimed to be deeply bound kaonic nuclei by Akaiashi et al.,[3]. Moreover, in the FINUDA experiment [4], a kaon-bound state K^-pp has been claimed to be observed. Still, there remains experimentally and theoretically to confirm these events are really the kaonic nuclear systems. At this stage the theree-body K^-NN system is the simplest and the most significant one to be studied theoretically, since we can learn basic physics such as KN interactions, decay properties in transparency without any complications due to medium effect. I will discuss the structure of the ground state (J=0) and an excited state (J=1) of the three-body K^-NN and its decay process to (pi+Lambda+proton). references;[1] T. Suzuki, et al., Phys. Lett. B 597 (2004) 263.[2] M. Iwasaki, et al., nucl-ex/0310018, Phys. Lett. B, submitted forpublication.[3] Y. Akaishi, et al., Phys. Lett. B 613 (2005) 140 and the referencestherein.[4] M. Agnello, et al., Phys. Rev. Lett. 94 (2005) 212303.
日時：2005年11月15日（火） 13:45-15:00
場所：理学研究科合同B棟721号室
Thermal properties of low-density neutron matter are investigated bynuclear many-body calculationon three-dimensional cubic lattice. Determinantal quantum Monte Carlocalculations are carried outfor the Hamiltonian determined by the use of the method of effective fieldtheory. The investigationis an ongoing project, and an overview of the project will be presented,including its future prospects.The present finding will be also discussed on thermal properties ofneutron-neutron correlationsin very low density neutron matter: a phase transition from a superfluidstate to normal,through a crossover region of Bose-Einstein condensation.
＊13時30分から茶菓を準備します。