Descrizione del progetto
Sondare le eccitazioni collettive nei nuclei atomici
La presenza di stati monoparticellari e collettivi nei nuclei atomici dà origine a vari fenomeni esotici. Il progetto LISA, finanziato dall’UE, prevede di indagare come il comportamento collettivo emerga da singole eccitazioni di protoni e neutroni, una delle principali questioni aperte della fisica nucleare. I ricercatori si serviranno di un nuovo metodo per eseguire misurazioni del ciclo vitale degli stati eccitati nei nuclei atomici che, combinato con innovativi rivelatori di tracciamento dei raggi gamma, potrebbe aiutare a superare le sfide attuali che impediscono le misurazioni del ciclo vitale con fasci a bassa intensità di nuclei instabili. I ricercatori sfrutteranno inoltre le capacità uniche della Facility for Antiproton and Ion Research, un impianto europeo che dovrebbe generare fasci di particelle di intensità e qualità ineguagliabili.
Obiettivo
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.
Parole chiave
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(si apre in una nuova finestra) ERC-2020-COG
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ERC-COG -Istituzione ospitante
64291 Darmstadt
Germania