nucl-th digest · May 8, 2015

Symmetry energy at subsaturation densities and the neutron skin thickness of 208Pb

The mass-dependent symmetry energy coefficients $a_{sy m} (A)$ has been extracted by analysing the heavy nuclear mass differences reducing the uncertainties as far as possible in our previous work. Taking advantage of the obtained symmetry energy coefficient $a_{sy m} (A)$ and the density profiles obtained by switching off the Coulomb interaction in $^{208} Pb$ , we calculated the slope parameter $L_{0.11}$ of the symmetry energy at the density of $0.11 fm^{- 3}$ . The calculated $L_{0.11}$ ranges from 40.5 MeV to 60.3 MeV. The slope parameter $L_{0.11}$ of the symmetry energy at the density of $0.11 fm^{- 3}$ is also calculated directly with Skyrme interactions for nuclear matter and is found to have a fine linear relation with the neutron skin thickness of $^{208} Pb$ , which is the difference of the neutron and proton rms radii of the nucleus. With the linear relation the neutron skin thickness $Δ R_{n p}$ of $^{208} Pb$ is predicted to be 0.15 - 0.21 fm.

nucl-thSCPMA(2015)·6 citations

Effective Field Theory of Emergent Symmetry Breaking in Deformed Atomic Nuclei

Spontaneous symmetry breaking in non-relativistic quantum systems has previously been addressed in the framework of effective field theory. Low-lying excitations are constructed from Nambu-Goldstone modes using symmetry arguments only. We extend that approach to finite systems. The approach is very general. To be specific, however, we consider atomic nuclei with intrinsically deformed ground states. The emergent symmetry breaking in such systems requires the introduction of additional degrees of freedom on top of the Nambu-Goldstone modes. Symmetry arguments suffice to construct the low-lying states of the system. In deformed nuclei these are vibrational modes each of which serves as band head of a rotational band.

nucl-thJ.Phys.G(2015)·11 citations

Friday·May 8, 2015

Symmetry energy at subsaturation densities and the neutron skin thickness of 208Pb

Effective Field Theory of Emergent Symmetry Breaking in Deformed Atomic Nuclei

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