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Scientific Highlights

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Datum
27. Januar 2021
muHe

Size of helium nucleus measured more precisely than ever before

In experiments at the Paul Scherrer Institute PSI, an international research collaboration has measured the radius of the atomic nucleus of helium five times more precisely than ever before. The researchers are publishing their results today in the journal Nature.

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13. Juli 2020
Teilchenphysik Teaser

In search of new physics

Matter and Material Particle physics Research with muons

With the high-intensity proton accelerator HIPA, the Paul Scherrer Institute generates elementary particles to clarify how the universe is structured. Using pions, muons, and neutrons, the researchers conduct experiments to test the standard model of particle physics.

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14. September 2017
teaser picture

The hard worker from Val Mesolcina

Matter and Material Research with muons Particle physics

For Aldo Antognini, physics and conviviality are in the bloodPSI researcher Aldo Antognini has received more than 2.2 million Swiss francs from the EU for his latest experiment. He wants to find out how magnetism is distributed in the proton. The particle physicist will be able to apply not only his scientific and technical talents, but his social flair as well.

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14. November 2016

The deuteron too poses a mystery

The deuteron — one of the simplest atomic nuclei, consisting of just one proton and one neutron — is considerably smaller than previously thought. This finding was arrived at by an international research group that carried out experiments at the Paul Scherrer Institute, PSI. The new result is consistent with a 2010 study by the same group, in which the researchers measured the proton and found a significantly smaller value than previous research using different experimental methods.

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23. August 2016

Search for the lepton flavour violating decay μ+→e+γ with the full dataset of the MEG experiment

The final results of the search for the lepton flavour violating decay μ+→e+γ based on the full dataset collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013 and totalling 7.5×1014 stopped muons on target are presented.

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13. Juli 2016

Muon polarization in the MEG experiment: predictions and measurements

The MEG experiment makes use of one of the world’s most intense low energy muon beams, in order to search for the lepton flavour violating process μ+→e+γ . We determined the residual beam polarization at the thin stopping target, by measuring the asymmetry of the angular distribution of Michel decay positrons as a function of energy. The initial muon beam polarization at the production is predicted to be Pμ=−1Pμ=−1 by the Standard Model (SM) with massless neutrinos.

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