On the Mass Formula and Wigner and Curvature Energy Terms
نویسنده
چکیده
The efficiency of different mass formulas derived from the liquid drop model including or not the curvature energy, the Wigner term and different powers of the relative neutron excess I has been determined by a least square fitting procedure to the experimental atomic masses assuming a constant R0,charge/A 1/3 ratio. The Wigner term and the curvature energy can be used independently to improve the accuracy of the mass formula. The different fits lead to a surface energy coefficient of around 17-18 MeV, a relative sharp charge radius r0 of 1.22-1.23 fm and a proton form-factor correction to the Coulomb energy of around 0.9 MeV.
منابع مشابه
On the coefficients of the liquid drop model mass formulae and nuclear radii
The coefficients of different mass formulae derived from the liquid drop model and including or not the curvature energy, the diffuseness correction to the Coulomb energy, the charge exchange correction term, different forms of the Wigner term and different powers of the relative neutron excess I = (N − Z)/A have been determined by a least square fitting procedure to 2027 experimental atomic ma...
متن کاملOn the liquid drop model mass formulae and charge radii
An adjustment to 782 ground state nuclear charge radii for nuclei with N,Z ≥ 8 leads to R0 = 1.2257 A 1/3 fm and σ = 0.124 fm for the charge radius. Assuming such a Coulomb energy Ec = 3 5 eZ/1.2257 A 1 3 , the coefficients of different possible mass formulae derived from the liquid drop model and including the shell and pairing energies have been determined from 2027 masses verifying N,Z ≥ 8 a...
متن کاملar X iv : n uc l - th / 0 50 30 06 v 1 3 M ar 2 00 5 1 An alternative understanding of mass formulas in terms of nuclear structure
A typical form of mass formula is re-explained in terms of nuclear structure. For N ≈ Z nuclei, we propose to start with the shell model picture and to consider the T = 0 2n − 2p (α-like) correlations in the first place, instead of the symmetry energy as a prior concept. Afterward, the symmetry energy is described on the basis of the α-like superfluidity caused by the T = 0 2n − 2p correlations...
متن کاملar X iv : n uc l - th / 0 50 30 06 v 2 2 1 M ay 2 00 5 1 An Alternative Understanding of Mass Formulas in Terms of Nuclear Structure
A typical form of mass formula is re-explained in terms of nuclear structure. For N ≈ Z nuclei, we propose to start with the shell model picture and to consider the T = 0 2n−2p (αlike) correlations as the fundamental concept, instead of the symmetry energy. Subsequently, the symmetry energy is described on the basis of the α-like superfluidity caused by the T = 0 2n− 2p correlations, in paralle...
متن کاملاثر محیط جاذب بر ویژگیهای غیرکلاسیکی حالتهای همدوس
In order to investigate the effect of a medium with dissipation and dispersion and also the curvature of the physical space on the properties of the incident quantum states, we use the quantization of electromagnetic field based on phenomenological approach to obtain input-output relations between radiations on both sides of dielectric slab. By using these relations the fidelity, the Wigner fun...
متن کامل