Microscopic Approaches to Collective Motion in Nuclei

Lead Research Organisation: University of Surrey
Department Name: Nuclear and Radiation Physics

Abstract

Among the rich variety of structures and processes that occur in atomic nuclei, those that fall under the term 'collective motion' are so-called because all or most of the nucleons (protons and neutrons) in the nucleus take part and move together. Examples include giant resonances in which the whole nucleus wobbles or vibrates like a jelly, and collisions between two nuclei in which they might either stick together or pass through each other, depending on details such as the way in which the two nuclei are fired at one another. We have recently developed the ability to simulate collective motion in nuclei using very few assumptions about the layout of the problem or the interaction between the individual nucleons in the nucleus. The first results of our calculations have shown new predictions of collective motion, such as the alignment of the direction of spin of the protons and neutrons induced by the collision with another nucleus, and have provided the first calculations of the giant resonance of a completely deformed nucleus which go into full microscopic detail. Despite these successes, the methods we have developed are inherently able to do well at calculating some quantities, but inherently unable to do well at calculating others. We want to improve the method to allow the effect, which is known to occur, that nucleons have a tendancy to pair up to be better taken into account, and also to allow us predict a whole class of properties, such as the distribution of mass fragments during collisions. The results will improve our understanding of nuclear processes from the point of view of the interaction between the individual nucleons and our understanding of different structures that occur in nuclei, and the underlying nuclear force.

Publications

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Stevenson P (2010) Extracting structure information from TDHF in Journal of Physics G: Nuclear and Particle Physics

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Stevenson P (2012) The tensor-kinetic field in nuclear collisions in Journal of Physics: Conference Series

 
Description We developed our understanding of the way that protons and neutrons interact in the atomic nucleus, and the way these interactions give rise to the behaviour of the nuclei during collisions.
Exploitation Route We gained a useful insight into the stability of the nuclear force model that is widely used across the community of theoretical nuclear physicists, which has implications for much current research in the area. This aspect has been picked up by some groups, who are working on this problem of stability
Sectors Energy

 
Description Nuclear Physics Rolling grant scheme
Amount £2,294,916 (GBP)
Funding ID ST/F012012/1 
Organisation Science and Technologies Facilities Council (STFC) 
Sector Academic/University
Country United Kingdom
Start 08/2008 
End 07/2013
 
Title Sky3d 
Description A time-dependent density functional code for general dynamical processes in nuclear physics, such as fusion, fission and resonance states 
Type Of Technology Software 
Year Produced 2014 
Impact Training for PhD students 
URL http://compsci.cas.vanderbilt.edu/Sky3D/
 
Description British science association festival 
Form Of Engagement Activity Participation in an open day or visit at my research institution
Part Of Official Scheme? Yes
Primary Audience Public/other audiences
Results and Impact 100 members of public attended talk

n/a
Year(s) Of Engagement Activity 2009