Determining the role of non-axial deformation on proton decays; DPUNS - A Differential Plunger for Unbound Nuclear States.

Lead Research Organisation: University of Manchester
Department Name: Physics and Astronomy

Abstract

This grant will further our understanding of one of the fundamental limits of nuclear stability. As more and more protons are added to a nucleus there comes a point at which the nucleus can no longer hold on to the last proton. This point is called the proton drip line. The last proton will usually be re-emitted in a very short time, on the scale of milliseconds or microseconds, after it has been absorbed. Nevertheless, excited states which decay by gamma-ray emission, on a picosecond time scale, can still exist in proton-unbound nuclei. In this grant we will characterise these excited states by building a new detector, DPUNS, which will uniquely allow the measurement of their lifetimes. This in turn permits, for the first time, the determination of the shapes of proton-unbound nuclei. Since the proton emission half-life depends sensitively on the shape of the nucleus, a consistent understanding of proton decay is our objective. This proposal contains a collaborative aspect with some of the world's experts in proton decays. Together, we will perform new calculations with unique new data to examine the role of asymmetric nuclear shapes on the proton emission rates and thereby, learn about the binding of the nuclear force. This is a challenging proposal which has the potential to bring about a step change in our ability to investigate nuclear structure beyond the proton drip line.
 
Description In this award, a new differential plunger device was built which enable the lifetime of nuclear states in exotic nuclei to be determined for the first time. This information was used to guid nuclear theory and gain a better understanding of how proton are emitted from exotic nuclei at the limits of nuclear existence.
Exploitation Route The new device is being used in collaboration by other international users to further their research at the moment in Finland.
Sectors Education,Electronics

 
Description STFC Industrial CASE Studentship Panel (Dave Cullen)
Geographic Reach National 
Policy Influence Type Membership of a guideline committee
URL https://stfc.ukri.org/funding/studentships/industrial-case-studentships/
 
Description Nuclear physics consolidated grant 2014
Amount £1,300,000 (GBP)
Funding ID ST/L005794/1 
Organisation Science and Technologies Facilities Council (STFC) 
Sector Academic/University
Country United Kingdom
Start 08/2014 
End 09/2018
 
Description STFC Industrial Case Award - Improved Identification of illicit materials using an X-ray Backscattering technique.
Amount £80,000 (GBP)
Funding ID ST/N00275X/1 
Organisation Science and Technologies Facilities Council (STFC) 
Sector Academic/University
Country United Kingdom
Start 09/2016 
End 10/2021
 
Title DPUNS - A new differential plunger device was constructed to measure the lifetime of exotic nuclear states. 
Description DPUNS - A new differential plunger device was constructed to measure the lifetime of exotic nuclear states. This device enable the lifetime of nuclear states to be measured in exotic nuclei beyond the drip line for the first time. The device enable a new simultaneous theoretical approach to determining proton-emission and gamma-emission rates in nuclei. The plunger device was commissioned in Finland and is now used by a series of international groups to further their research. 
Type Of Material Improvements to research infrastructure 
Year Produced 2016 
Provided To Others? Yes  
Impact The plunger device was commissioned in Finland and is now used by a series of international groups to measure liefeimte in nuclei beyond what was originally thought o be possible. A series of papers have been published in high-impact journals, Physical Review Letters, Physics Letters B and Physical Review C. 
 
Title Several large database of nuclear gamma-ray spectroscopy for lifetime analysis of particular isotopes. 
Description These databases consist of collections of gamma-ray coincidence data for transitions between nuclear energy levels in a series of isotopes produced in heavy-ion fusion-evaporation reactions with large arrays of germanium detectors. The data are primarily constructed for analysing nuclear state lifetimes. 
Type Of Material Database/Collection of data 
Year Produced 2014 
Provided To Others? No  
Impact Mainly publications and invited talks. 
 
Description Univeristy of Jyvaskyla 
Organisation University of Jyvaskyla
Department Department of Physics
Country Finland 
Sector Academic/University 
PI Contribution Brought the differential plunger to JYFL in order to carry out experiments with this device
Collaborator Contribution Collaboration supportedd this device and paid for some infrastructure.
Impact Many publications and support for additional STFC grant proposals
 
Description University of Cologne 
Organisation University of Cologne
Department Department of Physics
Country Germany 
Sector Academic/University 
PI Contribution Collaboration on experiments involving plungers and differential plunger devices for lifetime measurements.
Collaborator Contribution The partner has provided expertise and knowledge to this collaboration.
Impact Several research papers
Start Year 2008