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  • 1.
    Betan, Rodolfo Id
    et al.
    KTH, Tidigare Institutioner, Fysik.
    Liotta, Roberto J.
    KTH, Tidigare Institutioner, Fysik.
    Sandulescu, Nicolae
    Vertse, Tamas
    KTH, Tidigare Institutioner, Fysik.
    A shell model representation with antibound states2004Ingår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 584, nr 1-2, s. 48-57Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An unified shell model scheme is introduced that evaluates simultaneously the contributions of bound single-particle states, Gamow resonances and antibound states to processes occurring in the continuum part of nuclear spectra. This new scheme allows us to study the effect of the antibound pole and the remaining part of the complex continuum separately. The calculations, performed in the complex energy plane, are applied to the study of weakly bound nuclei. The influence of antibound states upon physical quantities in light as well as in heavy nuclei is assessed.

  • 2.
    Betan, Rodolfo Id.
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Liotta, Roberto
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Sandulescu, Neculai
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Vertse, Tamas
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Description of the continuum part of the spectrum by using the complex. energy plane2005Ingår i: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 31, nr 8, s. S1329-S1336Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Processes occurring in the continuum part of the spectrum are described by using a basis consisting of bound and antibound states plus Gamow resonances and the continuum background. The calculations, performed in the complex energy plane, are applied to the study of weakly bound nuclei. The influence of antibound states upon physical quantities in halo nuclei is assessed.

  • 3.
    Id Betan, Rodolfo M.
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Liotta, Robert J.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Sandulescu, Neculai
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Vertse, Tamas
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Complex shell model with antibound states2005Ingår i: Key Topics in Nuclear Structure / [ed] Covello, A, 2005, s. 91-101Konferensbidrag (Refereegranskat)
    Abstract [en]

    An unified shell model scheme to evaluate simultaneously the contributions of bound single-particle states, Gamow resonances, antibound (virtual) states and continuum complex scattering states is presented. The formalism could be very suitable to study processes occurring in the continuum part of the nuclear spectra.

  • 4.
    Id Betan, Rodolfo M
    et al.
    KTH, Tidigare Institutioner, Fysik.
    Liotta, Roberto J.
    KTH, Tidigare Institutioner, Fysik.
    Sandulescu, Neculai
    KTH, Tidigare Institutioner, Fysik.
    Vertse, Tamas
    KTH, Tidigare Institutioner, Fysik.
    Two-particle resonances in the complex energy plane2004Ingår i: Few-body systems, ISSN 0177-7963, E-ISSN 1432-5411, Vol. 34, nr 1-3, s. 51-56Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An evaluation of two-particle resonances in the complex energy plane is presented. The representation used in the method consists of bound and antibound single-particle states, Gamow resonances and scattering waves on the complex energy plane. Within this representation the structure of halo nuclei is studied.

  • 5. Khan, E
    et al.
    Sandulescu, Nicolae
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Van Giai, N
    Grasso, M
    Two-neutron transfer in nuclei close to the drip line2004Ingår i: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, nr 1, s. 014314-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We investigate the two-neutron transfer modes induced by (t,p) reactions in neutron-rich oxygen isotopes. The nuclear response to the pair transfer is calculated in the framework of continuum quasiparticle random phase approximation (cQRPA). The cQRPA allows a consistent determination of the residual interaction and an exact treatment of the continuum coupling. The (t,p) cross sections are calculated within the distorted wave Born approximation approach and the form factors are evaluated by different methods: macroscopically, following the Bayman and Kallio method, and fully microscopically. A significant part of the cross section corresponds to a high-lying collective mode built entirely upon continuum quasiparticle states.

  • 6.
    Sandulescu, Neculai
    KTH, Tidigare Institutioner, Fysik.
    Nuclear superfluidity and specific heat in the inner crust of neutron stars2004Ingår i: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 70, nr 2, s. 025801-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We analyze the temperature dependence of pairing correlations in the inner crust matter of neutron stars. The study is done in a finite-temperature HFB approach and by using a zero range pairing force adjusted to the pairing properties of infinite neutron matter. Within the same approach we investigate how the specific heat of the inner crust depends on temperature, matter inhomogeneity, and the assumption used for the pairing force. It is shown that in a physical relevant range of densities the pairing properties of inner crust matter depend significantly on temperature. The finite-temperature HFB calculations show also that the specific heat is rather sensitive to the presence of nuclear clusters inside the inner crust. However, the most dramatic change of the specific heat is determined by the scenario used for the neutron matter superfluidity.

  • 7.
    Sandulescu, Neculai
    et al.
    KTH, Tidigare Institutioner, Fysik.
    Van Giai, N
    Liotta, Roberto
    KTH, Tidigare Institutioner, Fysik.
    Superfluid properties of the inner crust of neutron stars2004Ingår i: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, nr 4, s. 045802-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Superfluid properties of the inner crust matter of neutron stars, formed by nuclear clusters immersed in a dilute neutron gas, are analyzed in a self-consistent Hartree-Fock-Bogoliubov approach. The calculations are performed with two pairing forces, fixed so as to obtain in infinite nuclear matter the pairing gaps provided by the Gogny force or by induced interactions. It is shown that the nuclear clusters can either suppress or enhance the pairing correlations inside the inner crust matter, depending on the density of the surrounding neutrons. The profile of the pairing field in the inner crust is rather similar for both pairing forces, but the values of the pairing gaps are drastically reduced for the force which simulates the polarization effects in infinite neutron matter.

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