238,084 research outputs found
Mirror nuclei constraint in mass formula
The macroscopic-microscopic mass formula is further improved by considering
mirror nuclei constraint. The rms deviation with respect to 2149 measured
nuclear masses is reduced to 0.441 MeV. The shell corrections, the deformations
of nuclei, the neutron and proton drip lines, and the shell gaps are also
investigated to test the model. The rms deviation of alpha-decay energies of 46
super-heavy nuclei is reduced to 0.263 MeV. The central position of the
super-heavy island could lie around N=176~178 and Z=116~120 according to the
shell corrections of nuclei.Comment: 15 pages, 7 figures, 3 tables; version to appear in Phys. Rev.
Constraining the tidal charge of brane black holes using their shadows
A constraint on the tidal charge generated within a brane world is shown.
Using the shadow of a rotating black hole in a brane context in order to
describe the M87* parameters recently announced by the Event Horizon Telescope
Collaboration, the deviation from circularity of the reported shadow produces
an upper bound on the bulk's nonlocal effect, which is conceived of as a tidal
charge in the four-dimensional brane induced by the five-dimensional bulk.
Therefore, a deviation from circularity leads to an upper bound
on the tidal charge .Comment: 9 pages, 2 figures, 1 table. V2 with minor changes and new
references. Published in The European Physical Journal
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