Anharmonic vibrations in nuclei

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• 作者：Fallot ; M. ; Chomaz ; Ph. ; André ; s ; M.V. ; Catara ; F. ; Lanza ; E.G. ; Scarpaci ; J.A.
• 关键词：21.60.Ev ; 21.10.Re ; 21.60.Jz ; 24.30.Cz ; Anharmonic vibrations ; Giant resonances ; Two-phonon states ; Three-phonon states
• 刊名：Nuclear Physics A
• 出版年：2003
• 期刊代码：44_03759474
• 类别：ph
• 出版时间：December 29, 2003
• 卷：729
• 期：2-4
• 页码：699-712
• 文件大小：224 K

摘要

We show that the non-linearities of large amplitude motions in atomic nuclei induce giant quadrupole and monopole vibrations. As a consequence, the main source of anharmonicity is the coupling with configurations including one of these two giant resonances on top of any state. Two-phonon energies are often lowered by one or two MeV because of the large matrix elements with such three phonon configurations. These effects are studied in two nuclei, ⁴⁰Ca and ²⁰⁸Pb.