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Role of boundary conditions in dynamic studies of nuclear giant resonances and collisions

Reinhard, PG, Stevenson, PD, Almehed, D, Maruhn, JA and Strayer, MR (2006) Role of boundary conditions in dynamic studies of nuclear giant resonances and collisions PHYSICAL REVIEW E, 73 (3). ? - ?. ISSN 1539-3755


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Absorbing boundary conditions are often employed in time-dependent mean-field calculations to cope with the problem of emitted particles which would otherwise return back onto the system and falsify the dynamical evolution. We scrutinize two widely used methods, imaginary potentials and gradual attenuation by a mask function. To that end, we consider breathing oscillations of a O-16 nucleus computed on a radial one-dimensional grid in coordinate space. The most critical test case is the computation of resonance spectra in the (linear) domain of small amplitude motion. Absorbing bounds turn out to provide a reliable alternative to fully fledged continuum random phase approximation (RPA) calculations, although rather large absorbing bounds are required to simulate reliably well continuum conditions. We also investigate the computation of observables in the nonlinear domain. This regime turns out to be less demanding. Smaller absorbing margin suffice to achieve the wanted absorption effect.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Fluids & Plasmas, Physics, Mathematical, Physics, METAL-CLUSTERS, CONTINUUM, DECAY, RPA
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Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:05
Last Modified: 23 Sep 2013 18:25

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