نتایج جستجو برای: nuclear shell model
تعداد نتایج: 2352255 فیلتر نتایج به سال:
Some emerging concepts of nuclear structure are overviewed. (i) Background: the many-body quantum atomic nucleus, a complex system comprising protons and neutrons (called nucleons collectively), has been studied largely based on idea liquid (à la Landau), where quasiparticles moving in (mean) potential well, with weak “residual” interactions between nucleons. The is rigid general, although it c...
We investigate the role of symmetry as a possible origin of chaos in the nuclear shell model. For this purpose we disentangle purely geometrical effects due to spin and isospin coupling of the many–body states, from effects of the reduced two– body interaction. We compare a model without symmetry (the embedded two– body ensemble of random matrices) with the two–body random ensemble (TBRE) of th...
We report on ab initio no-core shell model calculations in a symmetryadapted SU(3)-based coupling scheme that demonstrate that collective modes in p-shell nuclei emerge from first principles. The low-lying states of Li, He, Be, B, C, and O, are shown to exhibit orderly patterns that favor spatial configurations with strong quadrupole deformation and complementary low intrinsic spin values, a pi...
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