The program TFF calculates stripping single-particle form factors for one-neutron transfer in prior representation with appropriate perturbative treatment of recoil. Coupled equations are then integrated along a semiclassical trajectory to obtain one- and two-neutron transfer amplitudes and probabilities within first- and second-order...
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August 28, 2017 (v1)PublicationUploaded on: December 5, 2022
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March 22, 2021 (v1)Publication
The exotic, neutron-rich and weakly-bound isotope 29F stands out as a waymarker on the southern shore of the island of inversion, a portion of the nuclear chart where the effects of nuclear forces lead to a reshuffling of the single particle levels and to a reorganization of the nuclear structure far from stability. This nucleus has become very...
Uploaded on: March 27, 2023 -
September 5, 2024 (v1)Publication
We investigate the impact of the 6Li ground-state deformation on Coulomb-barrier penetrability in nuclear reactions between 6Li and a structureless projectile. The 6Li ground state is described through a quantum di-cluster model, including a quadrupolar component which induces a tensor term in the projectiletarget interaction. The corresponding...
Uploaded on: September 6, 2024 -
April 12, 2019 (v1)Publication
Several aspect of shape phase transitions and critical point symmstries are reviewed inthis contribution within the frameworks of the Interacting Boson Model(IBM) and theInteracting Boson Fermion Model(IBFM) for even and odd sysstems respectively andcompared with collective geometric models. We discuss in particular the case of an...
Uploaded on: March 27, 2023 -
September 25, 2017 (v1)Publication
The Bardeen-Cooper-Schrieffer (BCS) formalism is extended by including the single-particle continuum in order to analyse the evolution of pairing in an isotopic chain from stability up to the drip line. We propose a continuum discret ized generalized BCS based on single-particle pseudostates (PS). These PS are generated from the diagonalization...
Uploaded on: December 4, 2022 -
April 22, 2019 (v1)Publication
Various aspects of shape phase transitions in even as well as odd systems are reviewed. Firstly, the case of an odd j 3/2 particle coupled to an even-even boson core that undergoes a transition from spherical limit (U(5)) to the γ-unstable limit (0(6)) is illustrated. Energy spectrum and electromagnetic transitions, in correspondence of the...
Uploaded on: March 27, 2023 -
November 29, 2016 (v1)Publication
In a recent work [arXiv:1510.03185] the use of the Transformed Harmonic Oscillator (THO) basis for the discretization of the singleparticle continuum into a Generalized Bardeen-Cooper-Schrieffer (BCS) formalism was proposed for the description of weakly bound nuclei. We make use of the flexibility of this formalism to study the evolution of the...
Uploaded on: December 4, 2022 -
April 26, 2017 (v1)Publication
We investigate the phase transition in odd nuclei within the Interacting Boson Fermion Model in correspondence with the transition from spherical to stable axially deformed shape. The odd particle is assumed to be moving in the single-particle orbitals with angular momenta j=1/2,3/2,5/2 with a boson-fermion Hamiltonian that leads to the...
Uploaded on: December 4, 2022 -
March 28, 2019 (v1)Publication
We investigate different aspects connected with shape phase transitions in nuclei and the possible occurrence of dynamical symmetries at the critical points. We discuss in particular the behaviour of the neighbour odd nuclei at the vicinity of the critical points in the even nuclei. We consider both the case of the transition from the...
Uploaded on: March 27, 2023 -
April 26, 2017 (v1)Publication
In the light of renewed interest in experiments on two-particle transfer reactions, we study the evolution of the transfer spectroscopic intensities as a possible signature of shape-phase transitions. The study is carried out considering chains of even-even nuclei displaying changes in shape, such as from sphericity to axial-symmetric deformed...
Uploaded on: December 4, 2022 -
April 19, 2017 (v1)Publication
Shape phase transitions in odd-A nuclei are investigated within the framework of the interacting boson-fermion model. The case of a single j=9/2 fermion coupled to an even-even boson core is considered. This boson core transits from spherical to γ-unstable shapes depending on the value of a control parameter in the boson Hamiltonian. The effect...
Uploaded on: December 5, 2022 -
April 26, 2017 (v1)Publication
Within the neutron-proton interacting boson model we study the population of mixed-symmetry states via α transfer processes. Closed expressions are deduced in the case of the limiting Uπ+ν(5) and SUπ+ν(3). We find that the population of the lowest mixed-symmetry 2+ state, vanishing along the Nπ=Nν line, depends on the number of active bosons...
Uploaded on: December 4, 2022 -
April 26, 2017 (v1)Publication
The predictive power of the coherent state (CS) approach to the interacting boson model (IBM) is tested far from the IBM dynamical symmetry limits. The transitional region along the γ-unstable path from U(5) to O(6) is considered. Excitation energy of the excited β band and intraband and interband transitions obtained within the CS approach are...
Uploaded on: December 4, 2022 -
April 14, 2023 (v1)Publication
We explore two-particle transfer reactions as a crucial probe of the occurrence of shape coexistence in shape phase transitions. The (t,p) reactions to the ground state and to excited 0+ states are calculated for the isotope chain of even-even Zirconium isotopes starting from stable nuclei up to beyond current experimental limits. Two-particle...
Uploaded on: April 15, 2023 -
December 1, 2016 (v1)Publication
Quantum phase transitions in odd-nuclei are investigated within the framework of the interacting boson-fermion model with a description based on the concept of intrinsic states. We consider the case of a single j=9/2 odd-particle coupled to an even-even boson core that performs a transition from spherical to deformed prolate and to deformed...
Uploaded on: March 27, 2023 -
March 18, 2019 (v1)Publication
Quantum shape-phase transitions in odd-nuclei are investigated within the framework of the interacting boson-fermion model (IBFM). We consider the case of a single-j fermion coupled to an even-even boson core that performs a transition from spherical to oblate shapes varying a control parameter in the boson Hamiltonian. The aim of this work is...
Uploaded on: March 27, 2023 -
March 25, 2019 (v1)Publication
An extension of the Interacting Boson Model that includes the cubic (QI×QI×Q I)(0) term is proposed. The potential energy surface for the cubic quadrupole interaction is explicitly calculated within the coherent state formalism using the complete (χ-dependent) expression for the quadrupole operator. The Q-cubic term is found to depend on the...
Uploaded on: December 4, 2022 -
April 20, 2023 (v1)Publication
Weakly bound and unbound three-body nuclei are studied by using the pseudostate method within the hyperspherical formalism. After introducing the theoretical framework, the method is applied first to the 9Be nucleus, showing a good agreement with the available data for its low-lying dipole response. Then, recent results on the structure...
Uploaded on: April 29, 2023