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Very nice 2019 summer party

16 July 2019

Very nice 2019 summer party

On July 11th was held the annual APPN summer party, a strong tradition of the Institute for several decades. The participation was very strong with more than 160 people present - from trainees to retirees. There are a large number of straw hats, a strong indicator of success. Note that the last activities ended around 19:00!

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A new 4pi detector in the laboratory

1 July 2019

A new 4pi detector in the laboratory

The MIRRA (Materials under irradiation) group acquired in 2019 a new germanium well detector from Canberra.

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BlackHawk: The first public code calculating Hawking radiation from black holes

26 June 2019

BlackHawk: The first public code calculating Hawking radiation from black holes

J. Auffinger and A. Arbey of the Theory group wrote BlackHawk, a public code at the intersection of particle physics, general relativity, and astrophysics, for calculating the Hawking radiation emitted during Evaporation of a distribution of primordial black holes in rotation (so-called "de Kerr") or without rotation (so-called "Schwarzschild"). This code will be able to help us going forward in the understanding of dark matter.

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When neutron become anti-neutron

11 June 2019

When neutron become anti-neutron

The DUNE experiment, in which a team from our laboratory has responsibilities, is mainly dedicated to neutrinos. But its exceptional detector, made of 40 kt of Argon 40, will allow other measurements such as the search for neutron-antineutron oscillations. Nuclear physics makes the correspondance between the oscillation period of a free neutron and the life of the Argon 40 nucleus. The essential result is that the appearance of antineutron comes from the outer layers.

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First numerical simulation of neutron stars coalescence at the laboratory

6 June 2019

First numerical simulation of neutron stars coalescence at the laboratory

A team from Theoretical Physics group of the laboratory completed its first numerical simulation of the coalescence of two neutron stars using David Radice’s WhiskeyTHC code (Princeton University). This simulation was carried out on the computing cluster of the theory group, it mobilized 100 CPUs for 10 days. It lasts a hundred ms and shows two neutron stars orbiting around each other close enough to merge after a few turns. After fusion, a supra-massive star persists and emits a large amount of gravitational waves, then cools down and collapses into a black hole.

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