Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
Phys Rev Lett. 2009 Dec 11;103(24):242501. doi: 10.1103/PhysRevLett.103.242501. Epub 2009 Dec 8.
Experimental studies of one-nucleon knockout from magic nuclei suggest that their nucleon orbits are not fully occupied. This conflicts a commonly accepted view of the shell closure associated with such nuclei. The conflict can be reconciled if the overlap between initial and final nuclear states in a knockout reaction are calculated by a nonstandard method. The method employs an inhomogeneous equation based on correlation-dependent effective nucleon-nucleon interactions and allows the simplest wave functions, in which all nucleons occupy only the lowest nuclear orbits, to be used. The method also reproduces the recently established relation between reduction of spectroscopic strength, observed in knockout reactions on other nuclei, and nucleon binding energies. The implication of the inhomogeneous equation method for the physical meaning of spectroscopic factors is discussed.
对魔数核中一个核子的敲出实验研究表明，它们的核子轨道并没有被完全占据。这与人们普遍接受的与这些核有关的幻数核壳闭和观点相矛盾。如果用一种非标准方法来计算敲出反应中初始和末态核之间的重叠，那么这种矛盾是可以调和的。该方法采用了一个基于关联有效核子-核子相互作用的非均匀方程，并允许使用最简单的波函数，其中所有核子只占据最低的核轨道。该方法还再现了最近在其他核的敲出反应中观察到的光谱强度降低与核子束缚能之间的关系。讨论了非均匀方程方法对光谱因子物理意义的启示。
