Juha Aesto

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Juha Äystö is a Finnish experimental nuclear physicist . He is director of the Institute for Nuclear Physics in Helsinki and professor at Jyväskylä University .

Äystö developed in the 1980s a new method for the separation of isotopes in nuclear physics (especially exotic nuclei with a very short lifespan) proved particularly in the study of unstable nuclei in accelerators as a breakthrough, the ion guide (Ion Guide) concept. This contributed significantly to increasing the accuracy and selectivity of the measurement of basic nuclear properties in unstable isotopes and their nuclear reactions . The ions are first thermalized with a noble gas as a buffer gas so that they are all simply charged. Then the ion gas is accelerated to a supersonic jet which is directed into a mass separator . Äystö combined this with techniques of laser spectroscopy and ion traps to investigate exotic nuclei at the IGISOL system of the cyclotron in Jyväskylä. He also researches at the ISOLDE facility at CERN .

His concept was adopted worldwide and also used in atomic physics and elementary particle physics.

At the beginning he studied proton-rich sd-shell isotopes (with isospin - quantum number where a proton has the quantum number , a neutron has the opposite sign) and their beta-delayed decays with two protons. His methods and research contributed significantly to broadening knowledge of the properties of unstable and exotic nuclei, but also to important astrophysical nuclear reactions (such as r-process , rp-process ) and weak interaction ( double beta decay , unitarity of the CKM matrix ).

In 2010 he received the Lise Meitner Prize .

Fonts

  • Editor with Peter Dendooven, Ari Jokinen, Matti Leino: Exotic Nuclei and Atomic Masses. Proceedings of the Third International Conference on Exotic Nuclei and Atomic Masses ENAM2001. Hämeenlinna, Finland, 2-7 July 2001 , Springer 2009
  • Editor with Ari Jokinen, Tommi Eronen, Anu Kankainen TCP 2010: Proceedings of the 5th International Conference on Trapped Charged Particles and Fundamental Physics (TCP2010) held in Tunturihotelli in Saariselkä, Finland, April 12-16, 2010 , Springer Verlag 2011

Individual evidence

  1. ^ Institute for Nuclear Physics Helsinki
  2. ↑ Such as binding energy, radii, decay constants, spin, in the ground state and in excited states (isomers)
  3. ↑ In the bowl model between the magic bowls Z = 8 and 20
  4. ↑ Beta-delayed are delayed decays in which beta decays are involved. Delayed means that a short-lived isotope appeared as an intermediate state, the decay products of which appear delayed. There are also delayed decays with gamma rays only.
  5. ↑ Laudation with biography
personal data
SURNAME Aesto, Juha
BRIEF DESCRIPTION Finnish physicist
DATE OF BIRTH 20th century