All orders breakup of heavy exotic nuclei in a semiclassical model

García-Camacho, A.; Bonaccorso, A.; Brink, D.M.

doi:10.1016/j.nuclphysa.2006.07.033

Cited by 22 publications

(55 citation statements)

References 45 publications

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“…The bound and unbound states of the 11 Be are known to contain significant admixtures of core-excited components [33][34][35], and hence core excitation effects are expected to be important. This has been in fact confirmed in the case of resonant breakup of this nucleus on 1 H [13,14] and 12 C targets [15], using the no-recoil XDWBA method.…”

Section: Application To 11 Be Reactionssupporting

confidence: 56%

Continuum-discretized coupled-channels calculations with core excitation

et al. 2014

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The effect of core excitation in the elastic scattering and breakup of a two-body halo nucleus on a stable target nucleus is studied. The structure of the weakly bound projectile is described in the weak-coupling limit, assuming a particle-rotor model. The eigenfunctions and the associated eigenvalues are obtained by diagonalizing this Hamiltonian in a square-integrable basis (pseudostates). For the radial coordinate between the particle and the core, a transformed harmonic oscillator (THO) basis is used. For the reaction dynamics, an extension of the continuum-discretized coupled-channels (CDCC) method, which takes into account dynamic core excitation and de-excitation due to the presence of noncentral parts in the core-target interaction, is adapted to be used along with a pseudostates (PS) basis.

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Section: Application To 11 Be Reactionssupporting

confidence: 56%

Continuum-discretized coupled-channels calculations with core excitation

et al. 2014

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“…Particularly, it is timely to estimate what are the relevant excitations mechanisms for the reaction. In the case of elastic breakup, that we address here, several few-body formalisms have been developed to extract the corresponding cross sections: Continuum-Discretized Coupled-Channels (CDCC) method [2,3], the adiabatic approximation [4,5], the Faddeev/AGS equations [6,7], and a variety of semiclassical approximations [8][9][10][11][12][13]. The CDCC method is based upon an explicit discretization of all channels in the continuum and requires the solution of an extensive set of coupling equations.…”

Section: Introductionmentioning

confidence: 99%

Extracting three-body breakup observables from continuum-discretized coupled-channels calculations with core excitations

2017

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Background Core-excitation effects in the scattering of two-body halo nuclei have been investigated in previous works. In particular, these effects have been found to affect in a significant way the breakup cross sections of neutron-halo nuclei with a deformed core. To account for these effects, appropriate extensions of the continuum-discretized coupled-channels (CDCC) method have been recently proposed.Purpose We aim to extend these studies to the case of breakup reactions measured under complete kinematics or semi-inclusive reactions in which only the angular or energy distribution of one of the outgoing fragments is measured.Method We use the standard CDCC method as well as its extended version with core excitations (XCDCC), assuming a pseudo-state basis for describing the projectile states. Two-and three-body observables are computed by projecting the discrete two-body breakup amplitudes, obtained within these reaction frameworks, onto two-body scattering states with definite relative momentum of the outgoing fragments and a definite state of the core nucleus.Results Our working example is the one-neutron halo 11 Be. Breakup reactions on protons and 64 Zn targets are studied at 63.7 MeV/nucleon and 28.7 MeV, respectively. These energies, for which experimental data exist, and the targets provide two different scenarios where the angular and energy distributions of the fragments are computed. The importance of core dynamical effects is also compared for both cases. ConclusionsThe presented method provides a tool to compute double and triple differential cross sections for outgoing fragments following the breakup of a two-body projectile, and might be useful to analyze breakup reactions with other deformed weakly-bound nuclei, for which core excitations are expected to play a role. We have found that, while dynamical core excitations are important for the proton target at intermediate energies, they are very small for the Zn target at energies around the Coulomb barrier.

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“…Finally, in Fig.14, of Ref. [14], we showed that the Coulomb breakup cross section on heavy targets would be negligible compared to the total nuclear breakup cross section for heavy, neutron rich, exotic nuclei in which the valence nucleons are expected to be in d or f orbits and with separation energies of the order of 10 MeV or more. For heavy exotic projectiles such novel type of experiments, namely breakup on a heavy target, would be therefore possible and useful.…”

Section: Coulomb Breakupmentioning

confidence: 76%

“…For light nuclei the weak binding is associated to small angular momentum values of the occupied orbitals and, due to deformation of the nuclear surface, to strong particle vibration couplings which are at the origin of shell inversion effects [1]. Thus in the extreme case of halo nuclei such as several beryllium and lithium isotopes ( 11 Be, 12 Be, 14 Be, 11 Li), S n is even less than 1 MeV and the valence orbitals are s or p. As a consequence as much as 10% to 40% of the total reaction cross section is due to just one or two channels: 1n or 2n breakup and/or transfer to target bound states depending on the most favorable matching conditions. Therefore, out of necessity (N. Orr), breakup has been one of the most studied reactions for low intensity beams and the one for which several new models have been developed.…”

Section: Introductionmentioning

confidence: 99%

Physics with low energy radioactive beams

Bonaccorso

2012

EPJ Web of Conferences

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This is a review of the basic mechanisms leading to high energy breakup reactions, of the formalisms used to describe them and of some of the methods to obtain the optical potentials necessary in calculations involving exotic nuclei. Semiclassical reductions of the DWBA approximation for inclusive and exclusive breakup will be presented. The observables that can be calculated are projectile's core parallel momentum distributions, angular distributions of nucleons from the breakup, total breakup cross sections. Methods to study resonances at threshold in unbound nuclei are also introduced. In this case the exclusive observable calculated is the neutron-core relative energy spectrum. Finally, we study the two neutron transfer to the continuum reaction between two "normal" nuclei. The observable is the continuum excitation energy spectrum of the "exotic" residual nucleus created.

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All orders breakup of heavy exotic nuclei in a semiclassical model

Cited by 22 publications

References 45 publications

Continuum-discretized coupled-channels calculations with core excitation

Continuum-discretized coupled-channels calculations with core excitation

Extracting three-body breakup observables from continuum-discretized coupled-channels calculations with core excitations

Physics with low energy radioactive beams

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