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Nuclear Theory·nucl-th

Thursday·April 28, 2016

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 01

    Delta(1232) contribution to real photon radiative corrections for elastic electron-proton scattering

    R. E. Gerasimov🇷🇺 · V. S. Fadin🇷🇺

    Here we consider a contribution of Delta(1232) resonance to real photon radiative corrections for elastic -scattering. The effect is found to be small for past experiments to study unpolarized cross section as well as for the recent VEPP-3 experiment to investigate two-photon exchange effects by precision measurement of -scattering cross sections ratio.

    nucl-thhep-phJ.Phys.G(2016)·15 citations
  2. 02

    Thermodynamic Properties of a Nucleon under the Generalized Symmetric Woods-Saxon Potential in Flourine 17 Isotope

    B.C. Lütfüoğlu · M. Erdogan

    The exact analytical solution of the Schrödinger equation for a generalized symmetrical Woods-Saxon potential are examined for a nucleon in Fluorine 17 nucleus for bound and quasi-bound states in one dimension. The wave functions imply that the nucleon is completely confined within the nucleus, i.e., no decay probability for bound states, while tunneling probabilities arise for the quasi-bound state. We have calculated the temperature dependent Helmholtz free energies, the internal energies, the entropies and the specific heat capacities of the system. It is shown that, when the quasi-bound state is included, the internal energy and entropy increase, while the Helmholtz energy decreases at high temperatures. Very high excitation temperatures imply that the nucleus does not tend to release a nucleon. The calculated quasi bound state energy is in reasonable agreement with the experimental data on the cumulative fission energy issued by IAEA.

    nucl-thANADOLU UNIVERSITY JOURNAL OF SCIENCE AND…·1 citation
  3. 03

    Physical and unphysical solutions of random-phase approximation equation

    H. Nakada

    Properties of solutions of the RPA equation is reanalyzed mathematically, which is defined as a generalized eigenvalue problem of the stability matrix with the norm matrix . As well as physical solutions, unphysical solutions are examined in detail, with taking the possibility of Jordan blocks of the matrix into consideration. Two types of duality of eigenvectors and basis vectors of the Jordan blocks are pointed out and explored, which disclose many basic properties of the RPA solutions.

    nucl-thquant-phPTEP(2016)·8 citations
  4. 04

    Shell structure from nuclear observables

    I. Bentley · Y. Colon Rodrıguez · S. Cunningham · A. Aprahamian

    The appearance and disappearance of shells and subshells are determined using a previously introduced method of structural analysis. This work extends the approach and applies it to protons, in addition to neutrons, in an attempt to provide a more complete understanding of shell structure in nuclei. Experimental observables including the mean-square charge radius, as well as other spectroscopic and mass related quantities are analyzed for extrema. This analysis also uses differential observables among adjacent even-even nuclei to serve as the derivatives for these quantities of interest. Local extrema in these quantities indicate shell structure and the lack of local extrema indicate missing shell closures. The shell structure of low-mass nuclei is inconsistent likely as a consequence of the single-particle structure. Additionally, multiple shell features occurring in midshell regions are determined by combining information from two or more observables. Our results near stability complement previous observations further out.

    nucl-thPRC(2016)·13 citations
  5. 05

    Nuclear Matrix Elements for Tests of Local Lorentz Invariance Violation

    B. A. Brown🇺🇸 · G. F. Bertsch🇺🇸 · L. M. Robledo🇪🇸 · M. V. Romalis🇺🇸 · V. Zelevinsky🇺🇸

    The nuclear matrix elements for the momentum quadrupole operator are important for the interpretation of precision atomic physics experiments that search for violations of local Lorentz and CPT symmetry and for new spin-dependent forces. We use the configuration-interaction nuclear shell model and self-consistent mean field theory to calculate these matrix elements in Ne, Na, Xe, Yb and Hg. These are the first microscopic calculations of the nuclear matrix elements for the momentum quadrupole tensor that go beyond the single-particle estimate. We show that they are strongly suppressed by the many-body correlations, in contrast to the well known enhancement of the spatial quadrupole nuclear matrix elements.

    nucl-thPRL(2017)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE