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- Cederwall, Bo, et al.
(author)
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Evidence for a spin-aligned neutron-proton paired phase from the level structure of 92Pd
- 2011
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In: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 469:7328, s. 68-71
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Journal article (peer-reviewed)abstract
- Shell structure and magic numbers in atomic nuclei were generally explained by pioneering work(1) that introduced a strong spin-orbit interaction to the nuclear shell model potential. However, knowledge of nuclear forces and the mechanisms governing the structure of nuclei, in particular far from stability, is still incomplete. In nuclei with equal neutron and proton numbers (N = Z), enhanced correlations arise between neutrons and protons (two distinct types of fermions) that occupy orbitals with the same quantum numbers. Such correlations have been predicted to favour an unusual type of nuclear superfluidity, termed isoscalar neutron-proton pairing(2-6), in addition to normal isovector pairing. Despite many experimental efforts, these predictions have not been confirmed. Here we report the experimental observation of excited states in the N = Z = 46 nucleus Pd-92. Gamma rays emitted following the Ni-58(Ar-36,2n)Pd-92 fusion-evaporation reaction were identified using a combination of state-of-the-art high-resolution c-ray, charged-particle and neutron detector systems. Our results reveal evidence for a spin-aligned, isoscalar neutron-proton coupling scheme, different from the previous prediction(2-6). We suggest that this coupling scheme replaces normal superfluidity (characterized by seniority coupling(7,8)) in the ground and low-lying excited states of the heaviest N = Z nuclei. Such strong, isoscalar neutron-proton correlations would have a considerable impact on the nuclear level structure and possibly influence the dynamics of rapid proton capture in stellar nucleosynthesis.
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- Joss, D. T., et al.
(author)
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The influence of quasineutron configurations on 161Ta and nearby odd-A nuclei
- 2011
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In: AIP Conf. Proc.. - : AIP. - 9780735409835 ; , s. 43-48
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Conference paper (peer-reviewed)abstract
- Several strongly coupled bands in the neutron-deficient nucleus 161Ta have been identified and quasiparticle configuration assignments have been made on the basis of rotational alignments and cranked shell model calculations. The level scheme elucidated for 161Ta highlights the competition between the ν(h 9/2) and ν(i 13/2) orbitals to form the yrast spectrum. The band structures in 161Ta also provide new insights into the structural features of other heavy odd-A nuclei populated with much lower reaction cross sections in this region at the proton drip line.
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- Lundevall, K., et al.
(author)
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eGovernment in a swedish municipality-change management in the planning process
- 2012
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In: Proceedings of the European Conference on e-Government, ECEG. - 9781908272416 ; , s. 408-415
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Conference paper (peer-reviewed)abstract
- eGovernment continues to be an interesting area of study, especially since it is not simply about the implementation of ICTs, but rather, as this paper will show, about a larger change management process. When trying to understand the factors behind successful examples of eGovernment in the context of change management, most research so far focuses on the implementation phase in a literal sense and not on the planning phase, that precedes the implementation phase, or theevaluation phase that follows. This paper aims at remedying this by focusing on the planning phase; the development of an eGovernment strategy and vision, which is the departing point for a future implementation process. Through an in-depthcase study of the work done at a Swedish municipality, the city of Vasteras, this paper aims at answering the question: "Which are the key change management aspects of an eGovernment planning process?" By focusing on the planning phase of eGovernment in a Swedish municipality, this paper develops the knowledge and understanding of this kind of endeavour. Even if ICTs can be seen as a means to modernize government, technology alone cannot break down organizational and culturalbarriers - something that is necessary in order for the full benefits of eGovernment to be realized. The paper is hence primarily empirical in contribution. However, this paper also provides useful insights on the planning process for eGovernment and necessary aspects when creating an eGovernment strategy.
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