Central depression of nuclear charge density distribution

Electron scattering in isotonic chains as a probe of the proton shell structure of unstable nuclei

“…The DWBA has been used to analyze different aspects of the scattering of electrons by nuclei (see, e.g., Refs. [25,26,31,[35][36][37][38][39] and references therein). In the present work we employ the DWBA to study elastic electron scattering from isotones.…”

Watching the emergence of a Fano resonance in doubly excited helium

“…With the efficiency of the gating technique demonstrated, we compare the experimental absorption spectra to results calculated from first principles and to an analytic theory developed during the past decade [4,6,9] based on the description by Chu and Lin in Ref. [7]. In order to be directly comparable to the experiment, we employ the following expression which describes the time-dependent formation of the Fano absorption profile: Here, is the time delay, the Fano parameter, and Γ the resonance width.…”

“…Among the most well-known examples are the resonances in the extreme ultraviolet (XUV) absorption spectrum of doubly excited helium. From the early works on attosecond dynamics in helium [1,2] until today, there has been substantial theoretical interest on how these spectral lines emerge and evolve after the transition is triggered and the subsequent process of autoionization takes place [3][4][5][6][7][8][9], also in the presence of strong near-infrared (NIR) laser fields.…”

Existence problem of proton semi-bubble structure in the 21 + state of 34Si

“…Theoretically, a (semi-)bubble structure can exist in many nuclei, ranging from intermediatemass isotopes to hyperheavy systems, including 34 Si [9][10][11], 44 S [12], 46 Ar [12,13], neutron-rich Ar isotopes around 68 Ar [13], 36 Ar and Hg isotopes [3][4][5], superheavy and hyperheavy isotopes [14][15][16][17], etc. Some of these candidates, such as 36 Ar and Hg isotopes, have been ruled out by experiments [18].…”

“…A. Wheeler [2] prior to 1950s. The bubble structure is one of the simplest but widely discussed topology structure in history [3][4][5][6][7][8], and it is still a hot topic both theoretically and experimentally in recent years [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. However, a bubble structure is not expected to exist in nuclei because the nature of nucleon-nucleon interaction will lead to a saturation density (ρ sat ∼ 0.16 fm −3 ) at the center of nucleus.…”