PaperPanorama
FAQ

Nuclear Theory·nucl-th

Thursday·February 26, 2015

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    Calculating broad neutron resonances in a cut-off Woods-Saxon potential

    Á. Baran · Cs. Noszály · P. Salamon · T. Vertse

    In a cut-off Woods-Saxon (CWS) potential with realistic depth -matrix poles being far from the imaginary wave number axis form a sequence where the distances of the consecutive resonances are inversely proportional with the cut-off radius value, which is an unphysical parameter. Other poles lying closer to the imaginary wave number axis might have trajectories with irregular shapes as the depth of the potential increases. Poles being close repel each other, and their repulsion is responsible for the changes of the directions of the corresponding trajectories. The repulsion might cause that certain resonances become antibound and later resonances again when they collide on the imaginary axis. The interaction is extremely sensitive to the cut-off radius value, which is an apparent handicap of the CWS potential.

    nucl-thEPJA(2015)·4 citations
  2. 02

    Low-Energy Antinucleon-Nucleus Interaction Revisited

    E. Friedman🇮🇱

    Annihilation cross sections of antiprotons and antineutrons on the proton between 50 and 400 MeV/c show Coulomb focusing below 200 MeV/c and almost no charge-dependence above 200 MeV/c. Similar comparisons for heavier targets are not possible for lack of overlap between nuclear targets studied with and beams. Interpolating between -nucleus annihilation cross sections with the help of an optical potential to compare with -nucleus annihilation cross sections reveal unexpected features of Coulomb interactions in the latter. Direct comparisons between -nucleus and -nucleus annihilations at very low energies could be possible if cross sections are measured on the same targets and at the same energies as the available cross sections for . Such measurements may be feasible in the foreseeable future.

    nucl-thnucl-exHyperfine Interact.(2015)·4 citations
  3. 03

    Electron capture cross sections for stellar nucleosynthesis

    P.G. Giannaka🇬🇷 · T.S. Kosmas🇬🇷

    In the first stage of this work, we perform detailed calculations for the cross sections of the electron capture on nuclei under laboratory conditions. Towards this aim we exploit the advantages of a refined version of the proton-neutron quasi-particle random-phase approximation (pn-QRPA) and carry out state-by-state evaluations of the rates of exclusive processes that lead to any of the accessible transitions within the chosen model space. In the second stage of our present study, we translate the above mentioned -capture cross sections to the stellar environment ones by inserting the temperature dependence through a Maxwell-Boltzmann distribution describing the stellar electron gas. As a concrete nuclear target we use the isotope, which belongs to the iron group nuclei and plays prominent role in stellar nucleosynthesis at core collapse supernovae environment.

    nucl-thAdv.High Energy Phys.(2015)·16 citations

Affiliations

first authorsco-authorsvia INSPIRE