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Nuclear Theory·nucl-th

Thursday·July 8, 2021

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    Phase-dependent cross sections of deuteron-triton fusion in dichromatic intense fields with high-frequency limit

    Wenjuan Lv · Hao Duan · Jie Liu

    We investigate the influence of strong dichromatic laser fields (i.e. 1{\omega}-2{\omega} and 1{\omega}-3{\omega}) with high-frequency limit on the cross sections of deuteron-triton(DT) fusion in Kramers-Henneberger(KH) frame. We focus on the transitions of phase-dependent effects depending on a dimensionless quantity n_{d} , which equals the ratio of the quiver oscillation amplitude to the geometrical touching radius of the deuteron and triton as defined in our previous research. Theoretical calculations show that the angle-dependent as well as phase-dependent Coulomb barrier penetrabilities can be enhanced in dichromatic intense fields, and the corresponding angle-averaged penetrabilities and the fusion cross sections increase significantly compared with field-free case. Moreover, we find that there are twice shifts of the peak in the cross sections whenever the frequency becomes sufficiently low or the intensity sufficiently high. The reason for the first shift is the angle-dependence effects for sub-barrier fusion, while the second shift is due to the accumulation of over-barrier fusion, these mechanisms are analyzed in detail in this paper.

    nucl-thEPJA(2022)·14 citations
  2. 02

    Generalized seniority isomers in and around closed shell: a survey of Hg, Pb and Po isotopes

    Bhoomika Maheshwari · Deepika Choudhury · Ashok Kumar Jain

    In this paper, we investigate the generalized seniority scheme and the validity of Generalized Seniority Schmidt Model in and around the semi-magic region. A consistently same multi-j configuration is used to explain all the nuclear spectroscopic properties such as factors, moments and trends for the , and isomers in all the three Hg, Pb and Po isotopic chains. The inverted parabolic trends for the first states in Hg, Pb and Po isotopes are also explained using the generalized seniority scheme. A comparison with the experimental data is presented, wherever possible, and future possibilities are suggested.

    nucl-thNPA(2021)·9 citations
  3. 03

    Perturbative correction to the adiabatic approximation for reactions

    Laura Moschini · Natalia K. Timofeyuk · Ronald C. Johnson

    The adiabatic distorted wave approximation (ADWA) is widely used by the nuclear community to analyse deuteron stripping (,) experiments. It provides a quick way to take into account an important property of the reaction mechanism: deuteron breakup. In this work we provide a numerical quantification of a perturbative correction to this theory, recently proposed in [R.C. Johnson, J. Phys. G: Nucl. Part. Phys. 41 (2014) 094005] for separable rank-one nucleon-proton potentials. The correction involves an additional, nonlocal, term in the effective deuteron-target ADWA potential in the entrance channel. We test the calculations with perturbative corrections against continuum-discretized coupled channel predictions which treat deuteron breakup exactly.

    nucl-thJ.Phys.G(2021)·1 citation
  4. 04

    Tracing the dynamical interplay of low-energy reaction processes of exotic nuclei using a two-center molecular continuum

    Laura Moschini · Alexis Diaz-Torres

    The competition among reaction processes of a weakly-bound projectile at intermediate times of a slow collision has been unraveled. This has been done using a two-center molecular continuum within a semiclassical, time-dependent coupled-channel reaction model. Dynamical probabilities of elastic scattering, transfer and breakup agree with those derived from the direct integration of the time-dependent Schrödinger equation, demonstrating the usefulness of a two-center molecular continuum for gaining insights into the reaction dynamics of exotic nuclei.

    nucl-thPLB(2021)·5 citations
  5. 05

    Machine-learning approach to finite-size effects in systems with strongly interacting fermions

    Nawar Ismail · Alexandros Gezerlis

    We investigate the applicability of machine learning techniques in studying the finite-size effects associated with many-body physics. These techniques have an emerging presence in many-body theory as they have been used for interpolations, extrapolations, and in modeling wavefunctions. We will resolve several issues associated with machine learning and many-body calculations such as small datasets, outliers, and discontinuities, for the purpose of extrapolating finite calculations to macroscopic scales. We carry out a systematic investigation of two related systems by developing metrics that aim to avoid spurious effects and capture desired features. This work uses neural networks to extrapolate the Unitary Gas to the thermodynamic limit at zero-range, which is otherwise difficult to reach. The effective mass of strongly interacting neutron matter is also studied and makes use of the non-interacting problem to resolve discontinuous predictions. For this investigation, we also carried out new Auxiliary Field Diffusion Monte Carlo (AFDMC) calculations for a variety of densities and particle numbers. Ultimately, we demonstrate an effective utility for neural networks in this context.

    nucl-thcond-mat.quant-gasphysics.comp-phPRC(2021)·9 citations

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first authorsco-authorsvia INSPIRE