Descripción del proyecto
Estudiar las excitaciones colectivas en núcleos atómicos
La presencia de estados colectivos o de partículas individuales en núcleos atómicos da lugar a varios fenómenos exóticos. El proyecto LISA, financiado con fondos europeos, se propone investigar cómo el comportamiento colectivo surge de las excitaciones de neutrones y protones individuales, una de las grandes preguntas pendientes de la física nuclear. Los investigadores utilizarán un método novedoso para efectuar mediciones de vida de los estados excitados en núcleos atómicos que, combinados con detectores avanzados de trazas de rayos gamma, podrían ayudar a superar los retos actuales que impiden las mediciones de vida con haces de baja intensidad de núcleos inestables. Además, los investigadores aprovecharán las capacidades únicas de la Instalación para la investigación de antiprotones e iones, una instalación europea que se espera que genere haces de partículas con una intensidad y una calidad sin precedentes.
Objetivo
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.
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Programa(s)
Régimen de financiación
ERC-COG - Consolidator GrantInstitución de acogida
64291 Darmstadt
Alemania