Topic
Nuclear matter
About: Nuclear matter is a research topic. Over the lifetime, 10180 publications have been published within this topic receiving 248261 citations.
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TL;DR: In this article, the authors used the energy-dependent waveforms of the X-ray flux oscillations seen during some thermonuclear bursts from some neutron stars to constrain the mass M and radius R of neutron stars.
Abstract: Simultaneous, precise measurements of the mass M and radius R of neutron stars can yield uniquely valuable information about the still uncertain properties of cold matter at several times the density of nuclear matter. One method that could be used to measure M and R is to analyze the energy-dependent waveforms of the X-ray flux oscillations seen during some thermonuclear bursts from some neutron stars. These oscillations are thought to be produced by X-ray emission from hotter regions on the surface of the star that are rotating at or near the spin frequency of the star. Here we explore how well M and R could be determined by generating and analyzing, using Bayesian techniques, synthetic energy-resolved X-ray data that we produce assuming a future space mission having 2-30 keV energy coverage and an effective area of 10 m2, such as the proposed Large Observatory for X-Ray Timing or Advanced X-Ray Timing Array missions. We find that waveforms from hot spots within 10° of the rotation equator usually constrain both M and R with an uncertainty of about 10%, if there are 106 total counts from the spot, whereas waveforms from spots within 20° of the rotation pole provide no useful constraints. The constraints we report can usually be achieved even if the burst oscillations vary with time and data from multiple bursts must be used to obtain 106 counts from the hot spot. This is therefore a promising method to constrain M and R tightly enough to discriminate strongly between competing models of cold, high-density matter.
92 citations
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TL;DR: In this article, the equation of state for neutron matter at all temperatures is presented in a relativistic mean-field theory which describes known nuclear matter, and some limiting analytic forms of the EOS are given.
92 citations
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TL;DR: In this article, the effects of relativistic elastic unitarity on low-energy nucleon-nucleon scattering and the binding energy of nuclear matter were investigated and it was shown that relativism can increase the nuclear matter binding by approximately 0.5 MeV per particle over the value obtained for a non-relativistic potential having a similar shape and identical phase shifts.
92 citations
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TL;DR: In this paper, the authors studied the effect of the splitting of neutron and proton effective masses with isospin asymmetry on the properties of the Skyrme energy density functional and discussed the ability of the latter to predict observables of infinite matter and finite nuclei.
Abstract: We study the effect of the splitting of neutron and proton effective masses with isospin asymmetry on the properties of the Skyrme energy density functional. We discuss the ability of the latter to predict observables of infinite matter and finite nuclei, paying particular attention to controlling the agreement with ab initio predictions of the spin-isospin content of the nuclear equation of state, as well as diagnosing the onset of finite size instabilities, which we find to be of critical importance. We show that these various constraints cannot be simultaneously fulfilled by the standard Skyrme force, calling at least for an extension of its $P$-wave part.
92 citations
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TL;DR: In this paper, a precursor of the possible isospin separation instability in dense neutron-rich matter is predicted to appear as the local minima in the excitation functions of the transverse flow parameter for both neutrons and protons above the pion production threshold.
92 citations