| 1. |
- Dussel, G. G., et al.
(författare)
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Collective excitations in the continuum
- 2009
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Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 80:6, s. 064311-
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Tidskriftsartikel (refereegranskat)abstract
- Pairing (particle-particle) giant resonances are analyzed within a shell-model formalism in the complex energy plane with the aim of understanding why they have not been observed so far. A comparison is made with the equivalent particle-hole mode by applying the formalism to the analysis of the well-understood particle-hole giant resonance. It is found that because of the proper treatment of the continuum intrinsic to the formalism, giant pairing resonances lie much higher than previously predicted and that some of them may be too wide to be observed, whereas others are meaningful excitations. For these, new experimental searches are proposed.
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| 2. |
- Dussel, G. G., et al.
(författare)
-
One- and two-quasiparticle states in the complex energy plane
- 2007
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Ingår i: Nuclear Physics A. - : Elsevier BV. - 0375-9474 .- 1873-1554. ; 789, s. 182-200
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Tidskriftsartikel (refereegranskat)abstract
- One- and two-quasi particle states are studied in the complex energy plane. It is found that the pairing interaction does not change the character of the complex state. If a normal state is a physically meaningful resonance, then it will remain as such throughout the shell and if it is unphysical it will also remain as such throughout the shell. An important consequence of this is that it justifies the use of bound representations to evaluate many-body systems within the shell-model in cases where the single-particle states are narrow resonances. The character of two-quasiparticle states may oscillate between meaningful resonances and unphysical complex excitations as the number of particles increases.
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| 3. |
- Id Betan, R., et al.
(författare)
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Assessment of the importance of the pairing interaction in the continuum
- 2008
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Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 78:4, s. 044325-
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Tidskriftsartikel (refereegranskat)abstract
- A pairing interaction fitted to be applied in nuclei with active particles moving close to the continuum threshold or even immersed in the continuum itself is introduced. It is found that the effects of the nonresonant continuum upon physically meaningful quantities is unimportant. We applied the theory to heavy tin isotopes and good agreement between theory and the very few available experimental data is found.
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| 4. |
- Dussel, Veronica, et al.
(författare)
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Looking beyond where children die : Determinants and effects of planning a child's location of death.
- 2009
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Ingår i: Journal of Pain and Symptom Management. - : Elsevier BV. - 0885-3924 .- 1873-6513. ; 37:1, s. 33-43
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Tidskriftsartikel (refereegranskat)abstract
- While dying at home may be the choice of many, where people die may be less important than argued. We examined factors associated with parental planning of a child's location of death (LOD) and its effects on patterns of care and parent's experience. In a cross-sectional study of 140 parents who lost a child to cancer at one of two tertiary-level U.S. pediatric hospitals, 88 (63%) planned the child's LOD and 97% accomplished their plan. After adjusting for disease and family characteristics, families whose primary oncologist clearly explained treatment options during the child's end of life and who had home care involved were more likely to plan LOD. Planning LOD was associated with more home deaths (72% vs. 8% among those who did not plan, P<0.001) and fewer hospital admissions (54% vs. 98%, P<0.001). Parents who planned were more likely to feel very prepared for the child's end of life (33% vs. 12%, P=0.007) and very comfortable with LOD (84% vs. 40%, P<0.001), and less likely to have preferred a different LOD (2% vs. 46%, P<0.001). Among the 73 nonhome deaths, planning was associated with more deaths occurring in the ward than in the intensive care unit or other hospital (92% vs. 33%, P<0.001), and fewer children being intubated (21% vs. 48%, P=0.029). Comprehensive physician communication and home care involvement increase the likelihood of planning a child's LOD. Opportunity to plan LOD is associated with outcomes consistent with high-quality palliative care, even among nonhome deaths, and thus may represent a more relevant outcome than actual LOD.
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