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Nuclear Theory·nucl-th

Tuesday·October 31, 2017

17 papers—4 primary·13 cross-listed

All17Primary4Cross-lists13
  1. 01

    Two-Proton Radioactivity with 2p halo in light mass nuclei A1834

    G. Saxena · M. Kumawat · M. Kaushik · S. K. Jain · Mamta Aggarwal

    Two-proton radioactivity with 2p halo is reported theoretically in light mass nuclei A 18-34. We predict Mg, Si, S, Ar and Ca as promising candidates of ground state 2p-radioactivity with S 0 and S 0. Observation of extended tail of spatial charge density distribution, larger charge radius and study of proton single particle states, Fermi energy and the wave functions indicate 2p halo like structure which supports direct 2p emission. The Coulomb and centrifugal barriers in experimentally identified 2p unbound Si show a quasi-bound state that ensures enough life time for such experimental probes. Our predictions are in good accord with experimental and other theoretical data available so far.

    nucl-thnucl-exPLB(2017)·42 citations
  2. 02

    Modification of the masses of the lightest neutral mesons in a hadronic medium under an external magnetic field

    R. M. Aguirre🇦🇷

    The effective masses of the neutral mesons in a hadronic medium and under an external magnetic field are evaluated as functions of the baryonic density and the field intensity. For this purpose the meson polarization is evaluated in the one loop approximation using a Quantum Hadrodynamics model which includes pions, sigma, omega, and rho mesons. The propagators of the baryons include the full effect of the coupling to the magnetic field through their charges and their anomalous magnetic moments. Within the range of magnetic intensities considered here G G, the dependence on B is moderate for the pion and the longitudinal component of the omega meson, and negligible for the remaining mesons.

    nucl-thhep-phPRD(2017)·20 citations
  3. 03

    Extrapolation of scattering data to the negative-energy region II

    L. D. Blokhintsev · A. S. Kadyrov · A. M. Mukhamedzhanov · D. A. Savin

    A problem of analytical continuation of scattering data to the negative-energy region to obtain information about bound states is discussed within an exactly solvable potential model. This work is continuation of the previous one by the same authors [L. D. Blokhintsev et al., Phys. Rev. C 95, 044618 (2017)]. The goal of this paper is to determine the most effective way of analytic continuation for different systems. The and C systems are considered and, for comparison, an effective-range function approach and a recently suggested -method [O. L. Ram\'ırez Suárez and J.-M. Sparenberg, Phys. Rev. C 96, 034601 (2017)] are applied. We conclude that the -method is more effective for heavier systems with large values of the Coulomb parameter, whereas for light systems with small values of the Coulomb parameter the effective-range function method might be preferable.

    nucl-thPRC(2018)·23 citations
  4. 04

    Influence of fusion dynamics on fission observables: A multi-dimensional analysis

    C. Schmitt🇫🇷 · K. Mazurek🇵🇱 · P.N. Nadtochy🇷🇺

    An attempt to unfold the respective influence of the fusion and fission stages on typical fission observables, and namely the neutron pre-scission multiplicity, is proposed. A four-dimensional dynamical stochastic Langevin model is used to calculate the decay by fission of excited compound nuclei produced in a wide set of heavy-ion collisions. The comparison of the results from such a calculation and experimental data is discussed, guided by predictions of the dynamical deterministic HICOL code for the compound-nucleus formation time. While the dependence of the latter on the entrance-channel properties can straigthforwardly explain some observations, a complex interplay between the various parameters of the reaction can occur in other cases. A multi-dimensional analysis of the respective role of these parameters, including entrance-channel asymmetry, bombarding energy, compound-nucleus fissility, angular momentum and excitation energy, is proposed. It is shown that, depending on the size of the system, apparent unconsistencies may be deduced when projecting onto specific ordering parameters. The work suggests the possibility of delicate compensation effects in governing the measured fission observables, thereby highlighting the necessity of a multi-dimensional discussion.

    nucl-thPRC(2018)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE