Dynamical Particle-Phonon Couplings in Proton Emission from Spherical Nuclei

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概要

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• We have solved the coupled-channels equations to take into account the effects of the vibrational excitations of the spherical daughter nucleus during the proton emission. Applying the formalism to the the resonant 1h_11/2 and 3s_1/2 states in ^161Re and the 2d_3/2 state in ^160Re, we have found that the experimental data for the decay half-lives for these three states can be reproduced simultaneously if the quadrupole phonon excitation with β_2 〜 0.16 is considered. This removes the discrepancy observed before between the experimental data and the prediction of the optical potential model calculation for the decaying 2d_3/2 state in this mass region without destroying the agreement for the 1h_11/2 and 3s_1/2 states. A similar calculation with the octupole phonon was not satisfactory. We also discussed the fine structure in proton emission of ^145Tm nucleus. The experimental data for the half-life as well as the branching ratio were simultaneously reproduced within our model, with a reasonable admixture of the excited state components in the total wave function. The previous coupled-channels analyses were restricted to deformed proton emitters. Our studies indicate that the channel coupling effects are significant also for spherical emitters. Combining with the previous results, our analyses show that all the observed proton emitters can now be described in a simple single particle picture provided that the collective motion of the daughter nucleus is taken into account. We thank Cary Davids and Krzysztof Rykaczewski for useful discussions.

• 理論物理学刊行会の論文
• 2002-12-26

著者

• Hagino K

  Kyoto Univ. Kyoto Jpn

• Hagino Kouichi

  Yukawa Institute For Theoretical Physics Kyoto University

• HAGINO K.

  Institut de Physique Nucleaire, IN2P3-CNRS, Universite Paris-Sud

• HAGINO Kouichi

  Yukawa Institute for Theoretical Physics, Kyoto University

関連論文

• The Nuclear Potential in Heavy-Ion Fusion
• Near Barrier Fusion Excitation Function of ^6Li+^Pb
• Reaction Dynamics for Fusion of Weakly-Bound Nuclei
• Effects of Dissipation on Fast Quantum Tunneling
• Heavy-Ion Fusion Reactions as Macroscopic Quantum Tunneling
• Dynamical Particle-Phonon Couplings in Proton Emission from Spherical Nuclei

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