Alpha Magnetic Spectrometer
The Alpha Magnetic Spectrometer (AMS-02) is a particle physics experiment module that is mounted on the International Space Station (ISS). The experiment is a recognized CERN experiment (RE1). The module is a detector that measures antimatter in cosmic rays; this information is needed to understand the formation of the Universe and search for evidence of dark matter.

The principal investigator is Nobel laureate particle physicist Samuel Ting. The launch of flight STS-134 carrying AMS-02 took place on 16 May 2011, and the spectrometer was installed on 19 May 2011. By April 15, 2015, AMS-02 had recorded over 60 billion cosmic ray events and 90 billion after five years of operation since its installation in May 2011.

In March 2013, Professor Ting reported initial results, saying that AMS had observed over 400,000 positrons, with the positron to electron fraction increasing from 10 GeV to 250 GeV. (Later results have shown a decrease in positron fraction at energies over about 275 GeV). There was "no significant variation over time, or any preferred incoming direction. These results are consistent with the positrons originating from the annihilation of dark matter particles in space, but not yet sufficiently conclusive to rule out other explanations." The results have been published in "Physical Review Letters". Additional data are still being collected.
Q18334
particle physics
Concept
Q25271
International Space Station
MISC
Q42944
CERN
LOC
Q83197
antimatter
Concept
Q11547
cosmic ray
Concept
Q1
Universe
Concept
Q79925
dark matter
Concept
Q7245082
principal investigator
Concept
Q339619
Nobel laureate
UNK
Q192715
Samuel Ting
PER
Q478803
STS-134
MISC
Q188463
spectrometer
Concept
Q3229
positron
Concept
Q2018386
Physical Review Letters
MEDIA
Q622434
Alpha Magnetic Spectrometer
MISC
2011-05-16T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
16 May 2011
DATE
2011-05-19T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
19 May 2011
DATE
2015-04-15T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
April 15, 2015
DATE
2011-05-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
May 2011
DATE
2013-03-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
March 2013
DATE
-02^^http://www.w3.org/2001/XMLSchema#decimal
-02
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
-134^^http://www.w3.org/2001/XMLSchema#decimal
-134
NUMBER
-02^^http://www.w3.org/2001/XMLSchema#decimal
-02
NUMBER
-02^^http://www.w3.org/2001/XMLSchema#decimal
-02
NUMBER
+60^^http://www.w3.org/2001/XMLSchema#decimal
60
NUMBER
+90^^http://www.w3.org/2001/XMLSchema#decimal
90
NUMBER
+400.000^^http://www.w3.org/2001/XMLSchema#decimal
400,000
NUMBER
+10^^http://www.w3.org/2001/XMLSchema#decimal
10
NUMBER
instance of
part of
UTC date of spacecraft launch