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Nuclear Theory·nucl-th

Wednesday·January 11, 2017

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    [Submitted on 10 Jan 2017]

    New Empirical Formula for ({/gamma}, n) reaction cross section near to GDR Peak for elements with Z \geq 60

    Rajnikant Makwana · S. Mukherjee · Jian-Song Wang · Zhi-Qiang Chen

    A new empirical formula has been developed that describes the nuclear reaction cross sections for the isotopes with . The results were supported by calculations using TALYS - 1.6, EMPIRE - 3.2.2 nuclear modular codes. The energy region for incident photon energy have been selected near to the giant dipole resonance (GDR) peak energy. The evaluated empirical data were compared with available data in the experimental data library - EXFOR. The data produced using TALYS - 1.6 and EMPIRE - 3.2.2 were in good agreement with experimental data. We have tested and presented the reproducibility of the present new empirical formula. We observed the reproducibility of the new empirical formula near to GDR peak energy is in good agreement with the experimental data and remarkable dependency on key nuclei properties: the neutron, proton and atomic number of the nuclei. The behavior of nucleus near GDR peak energy, and dependency of GDR peak on the isotopic nature were predicted. An effort has been made to explain the deformation of the GDR peak in nuclear reaction cross section for some isotopes, which could not reproduce with TALYS - 1.6 and EMPIRE - 3.2.2. The evaluated data have been presented for the isotopes 180W, 183W, 202Pb, 203Pb, 204Pb, 205Pb, 231Pa, 232U, 237U and 239Pu that have no previous measurements.

    Comments:
    Accepted to be published in Chinese Physics C, 24 pages, 13 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1701.02448 [pdf]
    CPC(2017)·4 citations
  2. 02

    [Submitted on 10 Jan 2017]

    Applications of nuclear physics to a wider context: from molecules to stars passing through hypernuclei

    Lorenzo Fortunato

    In this contribution I will review some of the researches that are currently being pursued in Padova (mainly within the In:Theory and Strength projects), focusing on the interdisciplinary applications of nuclear theory to several other branches of physics, with the aim of contributing to show the centrality of nuclear theory in the Italian scientific scenario and the prominence of this fertile field in fostering new physics. In particular, I will talk about: i) the recent solution of the long-standing "electron screening puzzle" that settles a fundamental controversy in nuclear astrophysics between the outcome of lab experiments on earth and nuclear reactions happening in stars; the application of algebraic methods to very diverse systems such as: ii) the supramolecular complex H2@C60, i.e. a diatomic hydrogen molecule caged in a fullerene and iii) to the spectrum of hypernuclei, i.e. systems made of a Lambda particles trapped in (heavy) nuclei.

    Comments:
    Based on the talk presented at: TNPI2016 - XV Conference on Theoretical Nuclear Physics in Italy
    Subjects:
    Nuclear Theory (nucl-th); physics.atm-clus (physics.atm-clus)
    arXiv:
    1701.02587 [pdf]
    J.Phys.Conf.Ser.(2018)·0 citations
  3. 03

    [Submitted on 10 Jan 2017]

    Doubly magic nuclei from Lattice QCD forces at 469 MeV/c

    C. McIlroy🇯🇵 · C. Barbieri🇬🇧 · T. Inoue🇯🇵 · T. Doi🇯🇵 · T. Hatsuda🇯🇵

    We perform ab initio self-consistent Green's function calculations of the closed shell nuclei He, O and Ca, based on two-nucleon potentials derived from Lattice QCD simulations, in the flavor SU(3) limit and at the pseudo-scalar meson mass of 469~MeV/c. The nucleon-nucleon interaction is obtained using the HAL QCD method and its short-distance repulsion is treated by means of ladder resummations outside the model space. Our results show that this approach diagonalises ultraviolet degrees of freedom correctly. Therefore, ground state energies can be obtained from infrared extrapolations even for the relatively hard potentials of HAL QCD. Comparing to previous Brueckner Hartree-Fock calculations, the total binding energies are sensibly improved by the full account of many-body correlations. The results suggest an interesting possible behaviour in which nuclei are unbound at very large pion masses and islands of stability appear at first around the traditional doubly-magic numbers when the pion mass is lowered toward its physical value. The calculated one-nucleon spectral distributions are qualitatively close to those of real nuclei even for the pseudo-scalar meson mass considered here.

    Comments:
    7 pages, 4 figures, RIKEN-QHP-286, RIKEN-iTHEMS-Report-17
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1701.02607 [pdf]
    PRC(2018)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE