Papers by Bipasha Bhowmick
International Journal of Modern Physics E-nuclear Physics, Mar 1, 2013
Neutron and proton driplines of single-Λ and double-Λ hypernuclei, Ξ − hypernuclei as well as nor... more Neutron and proton driplines of single-Λ and double-Λ hypernuclei, Ξ − hypernuclei as well as normal nuclei are studied within a relativistic mean field approach using an extended form of the FSU Gold Lagrangian density. Hyperons are found to produce bound nuclei beyond the normal nuclear driplines. Radii are found to decrease in hypernuclei near the driplines, in line with observations in light Λ hypernuclei near the stability valley, The inclusion of a Ξ − introduces a much larger change in radii than one or more Λ's.
International Journal of Modern Physics E-nuclear Physics, Jul 1, 2012
Hypernuclei have been studied within the framework of Relativistic Mean Field theory. The force F... more Hypernuclei have been studied within the framework of Relativistic Mean Field theory. The force FSU Gold has been extended to include hyperons. The effective hyperon-nucleon and nucleon-nucleon interactions have been obtained by fitting experimental energies in a number of hypernuclei over a wide range of mass. Calculations successfully describe various features including hyperon separation energy and single particle spectra of single-Λ hypernuclei throughout the periodic table. We also extend this formalism to double-Λ hypernuclei.
Shapes of light normal nuclei and Λ-hypernuclei are investigated using relativistic mean field ap... more Shapes of light normal nuclei and Λ-hypernuclei are investigated using relativistic mean field approach. The FSUGold parametrization is used for this purpose. The addition of a Λ is found to change the shape of the energy surface towards prolate. The deformation in a Λ-hypernucleus, when the hyperon is in the first excited state, is also discussed. The effect of the inclusion of the hyperon on the nuclear radius is generally small with one exception.
International Journal of Modern Physics E, 2012
Hypernuclei have been studied within the framework of Relativistic Mean Field theory. The force F... more Hypernuclei have been studied within the framework of Relativistic Mean Field theory. The force FSU Gold has been extended to include hyperons. The effective hyperon–nucleon and hyperon–hyperon interactions have been obtained by fitting experimental energies in a number of hypernuclei over a wide range of mass. Calculations successfully describe various features including hyperon separation energy and single particle spectra of single-Λ hypernuclei throughout the periodic table. We also extend this formalism to double-Λ hypernuclei.
Physical Review C, 2014
The recent discoveries of massive neutron stars, such as PSR J0348 + 0432 and PSR J1614 − 2230, h... more The recent discoveries of massive neutron stars, such as PSR J0348 + 0432 and PSR J1614 − 2230, have raised questions about the existence of exotic matter such as hyperons in the neutron star core. The validity of many established equations of states (EoS's) like the GM1 and FSUGold are also questioned. We investigate the existence of hyperonic matter in the central regions of massive neutron stars using Relativistic Mean Field (RMF) theory with the recently proposed IUFSU model. The IUFSU model is extended by including hyperons to study the neutron star in β equilibrium. The effect of different hyperonic potentials, namely Σ and Ξ potentials, on the EoS and hence the maximum mass of neutron stars has been studied. We have also considered the effect of stellar rotation since the observed massive stars are pulsars. It has been found that a maximum mass of 1.93M⊙, which is within the 3σ limit of the observed mass of PSR J0348 + 0432, can be obtained for rotating stars, with certain choices of the hyperonic potentials. The said star contains a fair amount of hyperons near the core.
The European Physical Journal A, 2014
Shapes of light normal nuclei and Λ-hypernuclei are investigated using relativistic mean field ap... more Shapes of light normal nuclei and Λ-hypernuclei are investigated using relativistic mean field approach. The FSUGold parametrization is used for this purpose. The addition of a Λ is found to change the shape of the energy surface towards positive deformation i.e. prolate shape. The deformation in a Λ-hypernucleus, when the hyperon is in the first excited state, is also discussed. The effect of the inclusion of the hyperon on the nuclear radius is generally small with one exception.
International Journal of Modern Physics E, 2013
Neutron and proton driplines of single-Λ and double-Λ hypernuclei, Ξ- hypernuclei as well as norm... more Neutron and proton driplines of single-Λ and double-Λ hypernuclei, Ξ- hypernuclei as well as normal nuclei are studied within a relativistic mean field approach using an extended form of the FSU Gold Lagrangian density. Hyperons are found to produce bound nuclei beyond the normal nuclear driplines. Radii are found to decrease in hypernuclei near the driplines, in line with observations in light Λ hypernuclei near the stability valley. The inclusion of a Ξ- introduces a much larger change in radii than one or more Λ's.
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Papers by Bipasha Bhowmick