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Nuclear Theory·nucl-th

Tuesday·September 13, 2016

15 papers—7 primary·8 cross-listed

All15Primary7Cross-lists8
  1. 01

    Role of correlations on spin-polarized neutron matter

    Isaac Vidana · Artur Polls · Victoria Durant

    Using the Hellmann--Feynman theorem we analyze the contribution of the different terms of the nucleon-nucleon interaction to the spin symmetry energy of neutron matter. The analysis is performed within the microscopic Brueckner--Hartree--Fock approach using the Argonne V18 realistic potential plus the Urbana IX three-body force. The main contribution to the spin-symmetry energy of neutron matter comes from the S=0 channel, acting only in the non-polarized neutron matter, in particular the and the partial waves. The importance of correlations in spin-polarized neutron matter is estimated by evaluating the kinetic energy difference between the correlated system and the underlying Fermi sea.

    nucl-thPRC(2016)·10 citations
  2. 02

    Three-body systems in pionless effective field theory

    Jared Vanasse

    Investigations of three-body nuclear systems using pionless effective field theory () are reviewed. The history of in and scattering is briefly discussed and emphasis put on the use of strict perturbative techniques. In addition renormalization issues appearing in scattering are also presented. Bound state calculations are addressed and new perturbative techniques for describing them are highlighted. Three-body breakup observables in scattering are also considered and the utility of for addressing them.

    nucl-thIJMPE(2016)·14 citations
  3. 03

    Correlating charge radius with quadrupole deformation and in atomic nuclei

    Bao-Hua Sun · Chuan-Ye Liu · Hao-Xin Wang

    A very good linear correlation is found between the four-point charge radius relation with that of quadrupole deformation data in even-even nuclei. This results in a further improved charge radius relation that holds in a precision of about 5 fm. Such correlations are also seen in global nuclear models, their precisions, however, are not enough to be consistent with the experimental data. The new relation between charge radii and deformation of even-even nuclei can be generalized to the reduced electric quadrupole transition probability between the first state and the ground state, and the mean lifetime of the first 2 state.

    nucl-thnucl-exPRC(2017)·17 citations
  4. 04

    Second-order perturbation theory for 3He and pd scattering in pionless EFT

    Sebastian König🇺🇸

    This work implements pionless effective field theory with the two-nucleon system expanded around the unitarity limit at second order perturbation theory. The expansion is found to converge well. All Coulomb effects are treated in perturbation theory, including two-photon contributions at next-to-next-to-leading order. After fixing a three-nucleon force to the 3He binding energy at this order, proton-deuteron scattering in the doublet S-wave channel is calculated for moderate center-of-mass momenta.

    nucl-thJ.Phys.G(2017)·28 citations
  6. 06

    Elastic scattering, polarization and absorption of relativistic antiprotons on nuclei

    A.B. Larionov🇩🇪 · H. Lenske🇩🇪

    We perform Glauber model calculations of the antiproton-nucleus elastic and quasielastic scattering and absorption in the beam momentum range GeV/c. A good agreement of our calculations with available LEAR data and with earlier Glauber model studies of the elastic scattering allows us to make predictions at the beam momenta of GeV/c, i.e. at the regime of the PANDA experiment at FAIR. The comparison with the proton-nucleus elastic scattering cross sections shows that the diffractive minima are much deeper in the case due to smaller absolute value of the ratio of the real-to-imaginary part of the elementary elastic amplitude. Significant polarization signal for elastic scattering at 10 GeV/c is expected. We have also revealed a strong dependence of the absorption cross section on the slope parameter of the transverse momentum dependence of the elementary amplitude. The optical potential is discussed.

    nucl-thhep-exhep-phnucl-exNPA(2017)·12 citations
  7. 07

    Determination of the threshold structure from the low energy reaction

    Ju-Jun Xie🇨🇳 · Wei-Hong Liang🇨🇳 · Eulogio Oset🇪🇸 · Pawel Moskal🇵🇱 · Magdalena Skurzok🇵🇱 · Colin Wilkin🇬🇧

    We analyze the data on cross sections and asymmetries for the reaction close to threshold and look for bound states of the system. Rather than parameterizing the scattering matrix, as is usually done, we develop a framework in which the optical potential is the key ingredient, and its strength, together with some production parameters, are fitted to the available experimental data. The relationship of the scattering matrix to the optical potential is established using the Bethe-Salpeter equation and the loop function incorporates the range of the interaction given by the empirical density. We find a local Breit Wigner form of the He amplitude below threshold with a clear peak in , which corresponds to an binding of about 0.3 MeV and a width of about 3 MeV. By fitting the potential we can also evaluate the scattering length, including its sign, thus resolving the ambiguity in the former analyses.

    nucl-thhep-phPRC(2017)·45 citations

Affiliations

first authorsco-authorsvia INSPIRE