منابع مشابه
Low-energy limit of the radiative dipole strength in nuclei
We explain the upbend phenomenon, which was first reported in Ref. [1], later observed systematically in the γ-ray strength functions below neutron threshold of various light and medium-mass nuclei and probed by different experimental techniques [2]. Studies of Ref. [3] have revealed that this phenomenon, occuring in various astrophysical sites, can have a significant impact on their elemental ...
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Two 1− levels at 5.35(10) and 6.85(5) MeV were observed for the first time in 20O. The strong direct excitation and subsequent γ -ray decay of these states in virtual photon scattering at 100 MeV/nucleon, along with B(Eλ) predictions for 20O states in this energy region, established their dipole character. The extracted B(E1)↑ values of 0.062(16) e2 fm2 and 0.035(9) e2 fm2 for the 5.35 and 6.85...
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The possibility of performing nowadays reactions with beams of unstable nuclei has opened a new field of study in nuclear physics. Using stable nuclei as targets and carrying out the experiments in inverse kinematics it becomes possible to have access to the excitation spectrum of the incoming short-lived projectiles. To this aim the most often used reactions are the Coulomb excitation and the ...
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We report the transition dipole strength of eumelanin (the principal human photoprotective pigment) in the ultraviolet and visible. We have used both theoretical (density functional) and experimental methods to show that eumelanin is not an unusually strong absorber amongst organic chromophores. This is somewhat surprising given its role as a photoprotectant, and suggests that the dark coloring...
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Low-energy M1 strength functions of ^{60,64,68}Fe are determined on the basis of large-scale shell-model calculations with the goal to study their development from the bottom to the middle of the neutron shell. We find that the zero-energy spike, which characterizes nuclei near closed shells, develops toward the middle of the shell into a bimodal structure composed of a weaker zero-energy spike...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2014
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.90.024304