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LIfetime measurements with Solid Active targets

Project description

Probing collective excitations in atomic nuclei

The presence of single-particle and collective states in atomic nuclei gives rise to various exotic phenomena. The EU-funded LISA project plans to investigate how collective behaviour emerges from single proton and neutron excitations, a major open question in nuclear physics. Researchers will use a novel method to conduct lifetime measurements of excited states in atomic nuclei which, combined with state-of-the-art gamma-ray tracking detectors, could help overcome current challenges that prevent lifetime measurements with low-intensity beams of unstable nuclei. Furthermore, researchers will exploit the unique capabilities of the Facility for Antiproton and Ion Research, a European facility that is expected to generate particle beams of unparalleled intensity and quality.


The coexistence of single-particle and collective degrees of freedom in atomic nuclei gives rise to various exotic phenomena. In nuclei with very asymmetric proton-to-neutron ratios, the strong nuclear interaction drives shell evolution which alters the orbital spacing, and in some cases even the ordering present in stable nuclei. In the absence of large gaps between orbitals, nuclei can take on non-spherical shapes and their excitations proceed through coherent and collective motion of many nucleons. Where and how collectivity emerges from the single-particle dynamics of protons and neutrons is an open question in nuclear structure physics that will be addressed with LISA in a unique way.
The aim of the LISA (LIfetime measurements with Solid Active targets) project is to develop a novel method for lifetime measurements in atomic nuclei. Lifetimes probe the collectivity of a nucleus through its electromagnetic transition properties. The experimental approach is based on active solid targets and will dramatically enhance the scope of measurements of excited-state lifetimes and thus transition probabilities achievable in exotic nuclei. Coupled to state-of-the-art gamma-ray tracking detectors such as AGATA, this novel instrument will overcome the present challenges of lifetimes measurements with low-intensity beams of unstable nuclei.
LISA will exploit the unique capabilities of FAIR, the future European fragmentation facility set to deliver the most exotic and highest intensity radioactive ion beams. LISA will greatly expand the physics program for nuclear structure studies at FAIR. Through the measurements made possible by LISA, our understanding of key aspects of single-particle and collective structures and their interplay will become much more developed. The results will have significant impact on the theoretical descriptions and modeling of atomic nuclei making their predictions more reliable.


Net EU contribution
€ 1 996 250,00
Planckstrasse 1
64291 Darmstadt

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Hessen Darmstadt Darmstadt, Kreisfreie Stadt
Activity type
Other funding
€ 0,00

Beneficiaries (2)