CASAL BERBEL , Jesús

Esta memoria de tesis surge con la idea de estudiar sistemas nucleares de interés astrofísico.La comprensión de los procesos de nucleosíntesis requiere una conexión profunda entre física nuclear y astrofísica. En general, las reacciones que describen la evolución de distintos escenarios astrofísicos dependen de las propiedades de los núcleos...

Background: Since the first experimental observation, two-nucleon radioactivity has gained renewed attention since the early 2000s. The 6 Be system is the lightest two-proton ground-state emitter, while 16 Be was recently proposed to be the first two-neutron ground-state emitter ever observed. A proper understanding of their properties and...

Background: Knockout reactions with proton targets provide an invaluable tool to access the properties of twoneutron halo nuclei. Recently, experimental results for the average opening angle as a function of the intrinsic neutron momentum in 11Li have shown a localization of dineutron correlations on the nucleus surface. Purpose: Study the...

Background: The population and decay of two-nucleon resonances offer exciting new opportunities to explore dripline phenomena. A proper understanding of these systems requires a solid description of the three-body (core+N +N) continuum. The identification of a state with resonant character from the background of nonresonant continuum states in...

Background: Lying at the lower edge of the "island of inversion," neutron-rich fluorine isotopes ( 29 – 31 F ) provide a curious case to study the configuration mixing in this part of the nuclear landscape. Recent studies have suggested that a prospective two-neutron halo in the dripline nucleus 31 F could be linked to the occupancy of the...

One-neutron removal (p,pn) reactions induced by two-neutron Borromean nuclei are studied within a Transfer-to-the-Continuum (TC) reaction framework, which incorporates the three-body character of the incident nucleus. The relative energy distribution of the residual unbound two-body subsystem, which is assumed to retain information on the...

We investigate low-energy Be9 elastic scattering on two different targets (heavy, light) within a four-body framework using the continuum-discretized coupled-channels (CDCC) method. The Be9 projectile is described in an α+α+n three-body model using the analytical transformed harmonic oscillator (THO) basis in hyperspherical coordinates. We show...

The scattering of 9Be on 208Pb is addressed within a four-body Continuum-Discretized Coupled-Channels (CDCC) framework, considering a three-body α + α + n projectile plus a structureless target. The projectile states are generated using the analytical Transformed Harmonic Oscillator (THO) basis in hyperspherical coordinates. Both the elastic...

We investigate the elastic scattering of 9Be on 208Pb at beam energies above (50MeV) and below (40MeV) the Coulomb barrier. The reaction is described within a four-body framework using the Continuum-Discretized Coupled-Channels (CDCC) method. The 9Be projectile states are generated using the analytical Transformed Harmonic Oscillator (THO)...

Recently, a square-integrable discrete basis, obtained performing a simple analytical local scale transformation to the harmonic oscillator basis, has been proposed and successfully applied to study the properties of two-body systems. Here, the method is generalized to study three-body systems. To test the goodness of the formalism and...

The continuum structure of the unbound system 10 Li, inferred from the 9 Li(d,p) 10 Li transfer reaction, is reexamined. Experimental data for this reaction, measured at two different energies, are analyzed with the same reaction framework and structure models. It is shown that the seemingly different features observed in the measured...

Recent data on the differential angular distribution for the transfer reaction 11Li(p,d)10Li at E/A=5.7 MeV in inverse kinematics are analyzed within the DWBA reaction framework, using the overlap functions calculated within a three-body model of 11Li. The weight of the different 10Li configurations in the system's ground state is obtained from...

The analytic THO method [1] is generalized to study three-body nuclei of astrophysical interest, and applied to 6He. Results are consistent with previous publications and experimental data [2, 3].

Two-neutron halo nuclei, such as 6He, 11Li or 14Be, are known to have a marked (core + n + n) three-body character, which is reflected in breakup, transfer or knockout reactions channels in nucleon-nucleon collisions. Their Borromean nature implies that the correlation between the valence halo neutrons is key to understand their properties, and...

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...

The Continuum-Discretized Coupled-Channels (CDCC) has been successfully employed to describe elastic and breakup of nuclear reactions induced by weakly bound projectiles. In this contribution, we review some other, less widespread applications of the CDCC wavefunction, some of them in combination with other reaction formalisms, which are being...

The ground states of the nuclei 40Mg and 39Na are investigated using the hyperspherical formalism. Since they are located at the edge of the "big island of inversion", we concentrate on whether we are likely to find twoneutron Borromean halos in these nuclei. A three-body model with effective 𝑛-𝑛 and 38Mg+𝑛 interactions is built for 40Mg based...

The Transfer to the Continuum method has been applied to describe the 11Li(p, pn) and 14Be(p, pn) reactions in inverse kinematics, using structure overlaps computed within a full three-body model for the projectile. Calculations agree with the available experimental data on the unbound 10Li and 13Be nuclei.

The structure of the Borromean nucleus 9Be (α+α+n) is addressed within a three-body approach using the analytical transformed harmonic oscillator method. The three-body formalism provides an accurate description of the radiative capture reaction rate for the entire temperature range relevant in astrophysics. At high temperatures, results match...

A relationship between the Coulomb inclusive break-up probability and the radiative capture reaction rate for weakly bound three-body systems is established. This direct link provides a robust procedure to estimate the reaction rate for nuclei of astrophysical interest by measuring inclusive break-up processes at different energies and angles....

Radiative capture reaction rates for 6He, 9Be and 17Ne formation at astrophysical conditions are studied within a three-body model using the analytical transformed harmonic oscillator method to calculate their states. An alternative procedure to estimate these rates from experimental data on low-energy breakup is also discussed.

Parfenova et al. state in [Phys. Rev. C 98, 034608 (2018)2469-998510.1103/PhysRevC.98.034608] that the results presented by Casal et al. [Phys. Rev. C 94, 054622 (2016)2469-998510.1103/PhysRevC.94.054622] concerning the radiative capture for Ne17 formation are incorrect and their conclusions erroneous mainly because of two reasons: (1) it is...