Quantum Statistical Theory of Damped Collective Transition in Highly Excited Nuclei : Nuclear Physics
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概要
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We formulate a quantum statistical theory for damping of the collective transition embedded in the highly excited states of nuclei. The theory is formulated on a general basis which assumes no detailed specification of model Hamiltonian. It provides us with a framework which can be used further for microscopic or model calculations. A definite expression is derived for the strength functions of the collective transition in terms of the response function for the intrinsic (irrelevant) degrees of freedom. Two kinds of the damping mechanism, the intrinsic damping and the fluctuational damping, are treated on a unified basis. It is shown that the motional narrowing is a phenomenon which is inherent to the dynamics of the finite quantum system irrespective of statistical ansatz used phenomenologically. The condition of the motion narrowing phenomenon is discussed in terms of characteristic quantities, e, g., relaxation time of the intrinsic response functions.
- 理論物理学刊行会の論文
- 1990-08-25
著者
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Matsuo Masayuki
Research Institute For Fundamental Physics Kyoto University
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MATSUO MASAYUKI
Graduate School of Science and Technology, Niigata University
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