Multipole Expansion for Relativistic Coulomb Excitation

We derive a general expression for the multipole expansion of the electro-magnetic interaction in relativistic heavy-ion collisions, which can be employed in higher-order dynamical calculations of Coulomb excitation. The interaction has diagonal as well as off-diagonal multipole components, associated with the intrinsic and relative coordinates of projectile and target. A simple truncation in the off-diagonal components gives excellent results in first-order perturbation theory for distant collisions and for beam energies up to 200 MeV/nucleon.Comment: 3 figures, Accepted for publication in Phys. Rev.

Peculiarities of sub-barrier fusion with quantum diffusion approach

With the quantum diffusion approach the unexpected behavior of fusion cross section, angular momentum, and astrophysical S-factor at sub-barrier energies has been revealed. Out of the region of short-range nuclear interaction and action of friction at turning point the decrease rate of the cross section under the barrier becomes smaller. The calculated results for the reactions with spherical nuclei are in a good agreement with the existing experimental data.Comment: 11 pages, 5 figure

Profiles of Caregiver-Reported Executive Function in Children with Down Syndrome

Children with Down syndrome (DS) are at risk for challenges with aspects of executive function (EF). The current study explores whether heterogeneity in EF profiles can be detected within a sample of children with DS. Participants were 69 children with DS, ages 3–10 years (M = 6.23, SD = 1.91). T-scores from a caregiver-report measure of executive function were modeled using latent profile analysis, and auxiliary analyses examined the association between demographic and biomedical factors and probability of profile membership. The two-profile solution was the best fit for the sample, with a profile that involved elevated scores in working memory only (“Working Memory Only” profile; 43% of sample) and a “Multi-Domain” profile that involved elevated scores in planning, inhibition, and working memory (57%). The presence of congenital heart defects was associated with a higher probability of assignment to the Multi-Domain profile. Findings from this study contribute to the characterization of heterogeneous outcomes associated with DS. © 2022 by the authors.Open access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Tabletop computer game mechanics for group rehabilitation of individuals with brain injury

In this paper we provide a rationale for using tabletop displays for the upper-limb movement rehabilitation of individuals with brain injury. We consider how computer game mechanics may leverage this technology to increase patient engagement and social interaction, and subsequently enhance prescribed training. In recent years there has been a growing interest among health professionals in the use of computer games and interactive technology for rehabilitation. Research indicates that games have the potential to stimulate a high level of interest and enjoyment in patients; enhance learning; provide safe task conditions; complement conventional therapy; and become intrinsically motivating. We explore how game mechanics that include reward structures, game challenges and augmented audiovisual feedback may enhance a goal-orientated rehabilitation learning space for individuals with brain injury. We pay particular attention to game design elements that support multiple players and show how these might be designed for interactive tabletop display systems in group rehabilitation