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Transverse charge densities in the nucleon in nuclear matter
Yakhshiev, U.,Kim, H.C. North-Holland Pub. Co 2013 Physics letters: B Vol.726 No.1
We investigated the transverse charge densities in the nucleon in nuclear matter within the framework of the in-medium modified Skyrme model. The medium modification of the nucleon electromagnetic form factors are first discussed. The results show that the form factors in nuclear matter fall off faster than those in free space, as the momentum transfer increases. As a result, the charge radii of the nucleon become larger, as the nuclear matter density increases. The transverse charge densities in the nucleon indicate that the size of the nucleon tends to bulge out in nuclear matter. This salient feature of the swelling is more clearly observed in the neutron case. When the proton is transversely polarized, the transverse charge densities exhibit the distortion due to the effects of the magnetization.
Test of the nonrelativistic $$c\bar{c}$$ potential
Yakhshiev Ulugbek 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.4
We analyze the charmonium states by testing a phenomenological nonrelativistic potential and propose a new set of parameters. This new set of parameters is fixed using only the lowest lying S-wave states of charmonia where the spin-orbit and the tensor interactions will not contribute. After fitting the parameters, we analyze the whole fine structure of charmonium states taking into account the spin-orbit and the tensor interactions. Calculations showed that the nonrelativistic potential model with a phenomenologically defined parameters was indeed a good approximation for describing the charmonium states.
Compressibility of Nuclear Matter from the Chiral Soliton Model
Ulugbek Yakhshiev 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.3
The compressibility of isospin symmetric nuclear matter is studied in the framework of the in-medium modi¯ed chiral soliton model. On one hand, in the mesonic sector, the model is related to pion physics in nuclear matter while on the other hand, in the many baryonic sector, it reproduces the volume term coe±cient aV of the semi-empirical binding energy formula. Within our framework,we found an interesting result that aV became density independent in the region ½ 2 [0:35½0; 1:08½0]. The model reproduces well the compression modulus, K » 300 MeV, of isospin symmetric and in¯nite nuclear matter. The compressibility of isospin symmetric nuclear matter is studied in the framework of the in-medium modi¯ed chiral soliton model. On one hand, in the mesonic sector, the model is related to pion physics in nuclear matter while on the other hand, in the many baryonic sector, it reproduces the volume term coe±cient aV of the semi-empirical binding energy formula. Within our framework,we found an interesting result that aV became density independent in the region ½ 2 [0:35½0; 1:08½0]. The model reproduces well the compression modulus, K » 300 MeV, of isospin symmetric and in¯nite nuclear matter.
Isospin Breaking Effects in Finite Nuclei
U. T. Yakhshiev 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.5
The isospin breaking effects in finite nuclei and, in particular, in magic nuclei are studied in the framework of the in-medium modified Skyrme model. During the studies, the phenomenological data in the mesonic sector are taken as an input in order to reproduce the isospin breaking effects in the baryonic sector. We have considered some representatives of light, middle-heavy and heavy nuclei. Within the present approach, the neutron-proton mass difference in a finite nucleus is shown to be opposite to its value calculated in the mirror partner of that nucleus.
Neutron star structure in an in-medium modified chiral soliton model
North-Holland Pub. Co 2015 Physics letters. Section B Vol.749 No.-
We study the internal structure of a static and spherically symmetric neutron star in the framework of an in-medium modified chiral soliton model. The Equations of State describing an infinite and asymmetric nuclear matter are obtained introducing the density dependent functions into the low energy free space Lagrangian of the model starting from the phenomenology of pionic atoms. The parametrizations of density dependent functions are related to the properties of isospin asymmetric nuclear systems at saturation density of symmetric nuclear matter ρ<SUB>0</SUB>~0.16 fm<SUP>-3</SUP>. Our results, corresponding to the compressibility of symmetric nuclear matter in the range 250 MeV@?K<SUB>0</SUB>@?270 MeV and the slop parameter value of symmetry energy in the range 30 MeV@?L<SUB>S</SUB>@?50 MeV, are consistent with the results from other approaches and with the experimental indications. Using the modified Equations of State, near the saturation density of symmetric nuclear matter ρ<SUB>0</SUB>, the extrapolations to the high density and highly isospin asymmetric regions have been performed. The calculations showed that the properties of ~1.4M<SUB>@?</SUB> and ~2M<SUB>@?</SUB> neutron stars can be well reproduced in the framework of present approach.