منابع مشابه
Collectivity in the optical response of small metal clusters
The question whether the linear absorption spectra of metal clusters can be interpreted as density oscillations (collective “plasmons”) or can only be understood as transitions between distinct molecular states is still a matter of debate for clusters with only a few electrons. We calculate the photoabsorption spectra of Na2 and Na5 comparing two different methods: quantum fluid-dynamics and ti...
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Phase transitions in open quantum systems, which are associated with the formation of collective states of a large width and of trapped states with rather small widths, are related to exceptional points of the Hamiltonian. Exceptional points are the singularities of the spectrum and eigenfunctions, when they are considered as functions of a coupling parameter. In the present paper this paramete...
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The energy and reduced transition probability B(E2; Oz, + 2+) for the lowest excited state in the neutron-rich isotope $$ls were measured by intermediate-energy Coulomb excitation. The excitation energy is E(Z+) = 1297( 18) keV and the reduced transition probability is B(E2;0?& + 2:) = 314(M) e2fm4. The experimental results are compared with self-consistent mean-field calculations and shell mod...
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In biological function emerges from the interactions of components with only partially aligned interests. An example is the brain-a large aggregation of neurons capable of producing unitary, coherent output. A theory for how such aggregations produce coherent output remains elusive. A first question we might ask is how collective is the behavior of the components? Here we introduce two properti...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 2017
ISSN: 0375-9474
DOI: 10.1016/j.nuclphysa.2017.05.017