Pionium
Pionium is an exotic atom consisting of one π+ and one π− meson. It can be created, for instance, by interaction of a proton beam accelerated by a particle accelerator and a target nucleus. Pionium has a short lifetime, predicted by chiral perturbation theory to be 6985289000000000000♠2.89×10−15 s. It decays mainly into two π0 mesons, and to a smaller extent into two photons.
Pionium is currently under investigation at CERN to measure its lifetime. The DIRAC collaboration was able to detect 21227 atomic pairs from a total of 7009150000000000000♠1.5×109 events, which allows the pionium lifetime to be determined to within statistical errors of 9%.
In 2006, the NA48/2 collaboration at CERN published an evidence for pionium production and decay in decays of charged kaons, studying mass spectra of daughter pion pairs in the events with three pions in the final state K± → π±(ππ)atom → π±π0π0. This was followed by a precision measurement of the S-wave pion scattering length, published by the collaboration in 2009.
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Rivers Of Babylon
by: Boney MBy the rivers of Babylon, there we sat down
ye-eah we wept, when we remembered Zion.
By the rivers of Babylon, there we sat down
ye-eah we wept, when we remembered Zion.
When the wicked
Carried us away in captivity
Required from us a song
Now how shall we sing the lord's song in a strange land
When the wicked
Carried us away in captivity
Requiering of us a song
Now how shall we sing the lord's song in a strange land
Let the words of our mouth and the meditations of our heart
be acceptable in thy sight here tonight
Let the words of our mouth and the meditation of our hearts
be acceptable in thy sight here tonight
By the rivers of Babylon, there we sat down
ye-eah we wept, when we remembered Zion.
By the rivers of Babylon, there we sat down
ye-eah we wept, when we remembered Zion.
By the rivers of Babylon (dark tears of Babylon)
there we sat down (You got to sing a song)
ye-eah we wept, (Sing a song of love)
when we remember Zion. (Yeah yeah yeah yeah yeah)
By the rivers of Babylon (Rough bits of Babylon)
there we sat down (You hear the people cry)
ye-eah we wept, (They need that ???)