The AMS analyses cosmic radiation.

On the track of the mysterious neutralino - Comment on 2014 September 20 (2)

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The indications for a possible neutralino come from the detector AMS on board of the International Space Station ISS. Read more:

Extracts from an article follow:

 

The AMS analyses cosmic radiation.

On the track of the mysterious neutralino

In cosmic radiation researchers have discovered indications of a particle, which up to now was not proven. Their measurements with a detector on board of space station ISS fit very well the theory of the neutralino, a particle of dark matter.

Now researchers report about indications for an up to now only theoretically known particle with the name neutralino, which according to the particle model of physicists belongs to the mysterious dark matter.

The indications for a possible neutralino come from the detector AMS on board of the International Space Station ISS. It analyses the cosmic radiation and then counts electrons and their opponents, the positively charged positrons. It then shows that the share of positrons increases rapidly from 8 giga electron volt (GeV) upwards and reaches a maximum at 275 GeV. This maximum should actually not exist it suggests a new source of positrons.

"We have measured a maximum with the positron share and that is exactly what the model of dark matter predicts".

The positron surplus proven by the AMS detector could well be explained through collisions of particles of dark matter. The results would be compatible with the existence of a neutralino, a particle of dark matter, which is only theoretically predicted up to now.

The measurements of course do not prove the existence of dark matter or a new type of particles. "We cannot exclude that there are also other explanations".

There are definitely other sources of positrons possible, for example pulsars.

The Alpha Magnet Spectrometer (AMS), also called AMS02 experiment, was transported to ISS in May 2011 with the last flight of the space shuttle "Endeavour". It is mounted to the space station at the ISS jib S3 segment at the side turned away from earth. The spectro-meter consists of a large permanent magnet, which diverts charged particles flying through. Charge and energy can be determined from the path curvature. More than 500 researchers from 16 countries took part in the development of the instrument, which weighs seven tons and costs 1.5 billion Euros. The researchers hope that the detector will still supply data until 2024.

Precise measurements of cosmic radiation are only possible in space. "The magnetic field of earth shields our planet extensively".

In about 400 kilometres height, where ISS flies, the shielding is however not complete. "That is why we can prove electrons and positrons there."

The atmosphere forms a second protection mechanism from cosmic radiation dangerous to organisms, because it absorbs electrons and positrons. Only because of the double shielding life is possible on earth.

The scientists hope to soon being able to solve the puzzle of dark matter. Further measurements with AMS are carried out to being able to determine the share of positrons with still higher energies.

The exact course of the curve is important because a kind of signature of dark matter could be in it.

 

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