大型放射光施設 SPring-8

コンテンツへジャンプする
» ENGLISH
パーソナルツール
 

SPring-8 セミナー(第122回)

副題/演題 Coherence, recoil effects and sum rules in Mossbauer excitations by Synchrotron radiation
開催期間 2004年07月21日
開催場所 SPring-8中央管理棟3FセミナーA
主催 (財)高輝度光科学研究センター
形式 レクチャー(講演)
分野 物質科学
概要

日   時 : 平成16年7月21日 16:00-17:00

講演者 : Prof. Harry J. Lipkin
所   属 : Weizmann Institute of Science, Israel

講演要旨
  The role of coherence and recoil effects in resonant nuclear scattering is reviewed in the light of more complicated new types of experiments that are being considered. These include the breakdown of the common expression f = exp (-k^2<x^2> and coherence effects when more than one excitation can occur in a given sample. The application of sum rules in the analysis of data is discussed.
  An apparent contradiction between two equally valid descriptions of multiple excitation is clarified together with the difference between coherent and incoherent multiple excitations. When many nuclei in a given sample are excited independently, the radiation is known to decay exponentially with the normal lifetime. But a state with n-nuclei excited can also be considered as a single quantum state whose decay to a state with n-1 nuclei excited is described by time-dependent perturbation theory as an exponential decay with a lifetime n-times shorter than the normal lifetime.

問い合わせ先 Alfred Baron (PHS 3883) (財)高輝度光科学研究センター


最終変更日 2006-04-08 17:01