Multiple giant resonances in nuclei: their excitation and decay

Hussein, M. S.; Carlson, B. V.; Canto, L. F.

doi:10.1016/j.nuclphysa.2003.11.029

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…An appealing semi-classical coupled-channels approach combined with a random-matrix model was suggested by Ko [15], which unifies the statistical and coherent pictures of energy dissipation in deep-inelastic collisions. This framework has been succesfully applied [16,17] to study the excitation of multiphonon giant resonances in heavy-ion collisions at intermediate energy.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Dissipative quantum dynamics in low-energy collisions of complex nuclei

et al. 2008

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Model calculations that include the effects of irreversible, environmental couplings on top of a coupled-channels dynamical description of the collision of two complex nuclei are presented. The Liouville-von Neumann equation for the time evolution of the density matrix of a dissipative system is solved numerically providing a consistent transition from coherent to decoherent (and dissipative) dynamics during the collision. Quantum decoherence and dissipation are clearly manifested in the model calculations. Energy dissipation, due to the irreversible decay of giant-dipole vibrational states of the colliding nuclei, is shown to result in a hindrance of quantum tunneling and fusion.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Dissipative quantum dynamics in low-energy collisions of complex nuclei

et al. 2008

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“…Here, deviations and even violations to the hypothesis are found [11,12]. However, for other theoretical applications, the assumption of the gBA hypothesis is successfully applied [13,14,15,16,17].…”

Section: Introductionmentioning

confidence: 99%

Is The Generalized Brink-Axel Hypothesis Valid?

Guttormsen¹,

Larsen²,

Görgen³

et al. 2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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Experimental results of the 237 Np(d, pγ) 238 Np reaction are presented, which verifies the generalized Brink-Axel (gBA) hypothesis for γ transitions between states in the quasi-continuum. The gBA hypothesis holds not only for specific collective resonances, but for the full dipole strength below the neutron separation energy. We discuss the validity of the gBA hypothesis also for lighter systems like 92 Zr where the concept of a unique γ-ray strength function (γSF) is problematic due to large Porter-Thomas fluctuations. Methods for studying the γSF and the fluctuations as function of excitation energy are presented.

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“…[2][3][4] Many calculations of high-energy Coulomb excitation include the effects of Coulomb deflection, but only through the effective impact parameter used in a straight-line trajectory. [7][8][9][10][11] The curvature of the trajectory is usually not taken into account. The curvature of the Coulomb trajectory increases the distance between the projectile and target, relative to a straight-line trajectory, and is thus expected to decrease Coulomb excitation, which is strongly dependent on the separation.…”

Section: Introductionmentioning

confidence: 99%