Browsing by Subject "Nuclear charge"
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Item Muonic x-rays and equivalent radius of nuclear charge distribution(Texas Tech University, 1973-08) Khan, Mazahir HasanNot availableItem Nuclear charge form factors of helium isotopes with configuration mixing(Texas Tech University, 1996-05) Khan, Shamim AkhterNuclear charge form factors of 3He and 4He have been calculated with configuration mixing up to 3hw in the first-order perturbation theory. It is observed that only (2s) excitation contributes to the nuclear form factor, all other states contributions vanish. We have shown that the mixing configuration in 3He and 4He which is due to residual two-body interaction is important. The residual interaction being used is Reid Soft Core type which gives correct excitation energy of 4He of the first excited state. The admixture coefficients of the order of 8% for 3He and 12% for 4He nuclide are obtained. The configuration mixing improves the form factor substantially over the one without any configuration mixing for both 3He and 4He nuclide for low momentum transfer. Short-Range-Correlation (SRC) of Jastrow type when invoked improves the agreement of calculations with the experimental data to some larger momentum transfer but does not reproduce the second minimum. At large momentum transfer the electron scattering from these light nuclide is able to give finer details of the interior features of the nucleons within the nucleus, where quark degrees of freedom seem to be important. D-state with SRC has shown second minimum and third maximum, though much smaller.Item Radial-moment analysis for muonic x-rays(Texas Tech University, 1977-12) Ray, Asok KumarThe crucial question to be answered in studying the radial shapes of spherical nuclei is: éxactly what parameter of the nuclear charge distribution is determined by each transition energy in muonic atoms? The measurement of the 2p , ->-ls. . energy for a particular muonic atom determines, of course, only a single parameter of the nuclear charge distribution. Since the earliest days of analyzing muonic x-ray energies, workers have recognized that different transitions determine different parameters, so that, in principle, energy measurements for a number of different transitions in a given atom might provide information about the radial shape of the nuclear charge density. T ^Y radial shape, we mean simply the form of the charge density p(r) "] . However, it has not been clear exactly what nuclear parameter is determined by a particular transition, except in the low-Z limit, where non-relativistic perturbation theory shows that level shifts are proportional to even moments of the charge density. In this limit, for instance, the 2p->-ls transitions measure the mean square radius . One occasionally hears or reads that the same is true for heavy atoms. This is not then case. Even for Z as low as 6, the 2p-^ls transitions do not determine exactly the mean square radius.