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author = "GRASSO, M"
<< < 1 2 3 4 5 > >>

Found 46 documents, displaying page 2 of 5

Temperature and finite-size effects in collective modes of superfluid Fermi gases

Author(s) : Grasso, M. , Khan, E. , Urban, M.
Description : We study the effects of superfluidity on the monopole and quadrupole collective excitations of a dilute ultra-cold Fermi gas with an attractive interatomic interaction. The system is treated fully microscopically within the Bogoliubov-de Gennes and quasiparticle random-phase approximation methods....
Repository : arXiv
Language(s) : Undetermined

Continuum HFB calculations with finite range pairing interactions

Author(s) : Grasso, M. , Van Giai, N. , Sandulescu, N.
Description : A new method of calculating pairing correlations in coordinate space with finite range interactions is presented. In the Hartree-Fock-Bogoliubov (HFB) approach the mean field part is derived from a Skyrme-type force whereas the pairing field is constructed with a Gogny force. An iterative scheme i...
Repository : arXiv
Language(s) : Undetermined

Extended RPA within a solvable 3 level model

Author(s) : Catara, F. , Grasso, M. , Sambataro, M.
Description : Working within an exactly solvable 3 level model, we discuss am extension of the Random Phase Approximation (RPA) based on a boson formalism. A boson Hamiltonian is defined via a mapping procedure and its expansion truncated at four-boson terms. RPA-type equations are then constructed and solved ...
Repository : arXiv
Language(s) : Undetermined

Continuum quasiparticle random phase approximation and the time dependent Hartree-Fock-Bogoliubov approach

Author(s) : Khan, E. , Sandulescu, N. , Grasso, M. , Van Giai, Nguyen
Description : Quadrupole excitations of neutron-rich nuclei are analyzed by using the linear response method in the Quasiparticle Random Phase Approximation (QRPA). The QRPA response is derived starting from the time-dependent Hartree-Fock-Bogoliubov (HFB) equations. The residual interaction between the quasipa...
Repository : arXiv
Language(s) : Undetermined

Two-neutron transfer in nuclei close to the dripline

Author(s) : Khan, E. , Sandulescu, N. , Van Giai, Nguyen , Grasso, M.
Description : 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 resid...
Repository : arXiv
Language(s) : Undetermined

Configuration interaction study of single and double dipole plasmon excitations in Na_8

Author(s) : Catara, F. , Gambacurta, D. , Grasso, M. , Sambataro, M.
Description : We carry out a microscopic analysis of the ground and excited states of the Na_8 metal cluster within the jellium model. We perform a series of configuration interaction calculations on a Hartree-Fock basis and construct eigenstates of the Hamiltonian which carry up to 4-particle 4-hole components...
Repository : arXiv
Language(s) : Undetermined

A beyond-mean-field example with zero–range effective interactions in infinite nuclear matter

Author(s) : Moghrabi K. , Grasso M. , Roca-Maza X. , Colò G. , Van Giai N.
Description : Zero–range effective interactions are commonly used in nuclear physics to describe a many-body system in the mean-field framework. If they are employed in beyond-mean-field models, an artificial ultraviolet divergence is generated by the zero-range of the interaction. We analyze this problem in symm...
Repository : DOAJ-Articles
Language(s) : English

Probing the pairing interaction through two-neutron transfer reactions

Author(s) : Grasso M. , Beaumel D. , Khan E. , Lacroix D. , Margueron J. , Vitturi A.
Description : The treatment of the pairing interaction in mean-field-based models is addressed. In particular, the possibility to use pair transfers as A tool to better constrain this interaction is discussed. First, pairing inter-actions with various density dependencies (surface/volume mixing) are used in the m...
Repository : DOAJ-Articles
Language(s) : English

Detecting bubbles in exotic nuclei

Author(s) : Khan, E. , Grasso, M. , Margueron, J. , Van Giai, N.
Description : The occurrence of a bubble, due to an inversion of s$_{1/2}$ state with the state usually located above, is investigated. Proton bubbles in neutron-rich Argon isotopes are optimal candidates. Pairing effects which can play against the bubble formation are evaluated. They cannot prevent bubble form...
Repository : arXiv
Language(s) : Undetermined

Beyond-mean-field theories with zero-range effective interactions. A way to handle the ultraviolet divergence

Author(s) : Moghrabi, K. , Grasso, M. , Colò, G. , Van Giai, N.
Description : Zero-range effective interactions are commonly used in nuclear physics and in other domains to describe many-body systems within the mean-field model. If they are used within a beyond-mean-field framework, contributions to the total energy that display an ultraviolet divergence are found. We propo...
Repository : arXiv
Language(s) : Undetermined
<< < 1 2 3 4 5 > >>

Found 46 documents, displaying page 2 of 5