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Michigan Spin Physics Center : ウィキペディア英語版
Michigan Spin Physics Center

The University of Michigan Spin Physics Center focuses on studies of spin effects in high polarized proton-proton elastic and inelastic scattering. These polarized scattering experiments use the world-class solid and jet polarized proton targets, which are developed, upgraded and tested at the Center. The Center obtained a record density of about 1012 spin-polarized hydrogen atoms per cm3.
The Center also led the development of the world's first accelerated polarized beams at the 12 GeV Argonne ZGS (in 1973) and then at the 28 GeV Brookhaven AGS. The Center led pioneering experiments at the IUCF Cooler Ring from 1988 until its 2003 shutdown, which developed and tested Siberian snakes and Spin-flippers, which are now used to accelerate, store and use high energy polarized proton beams.
The Center also leads the International SPIN Collaboration and its proton polarization know-how is used in many experiments worldwide.
==Main discoveries==
In 1978 the Center found that protons with parallel spins interact much stronger than protons with anti-parallel spin. According to Quantum Chromodynamics the interaction between parallel and anti-parallel spinning proton beams should be the same. Sheldon Glashow called this effect "the thorn in the side of QCD".
This effect remained unexplained until today. In 2005 Stan Brodsky called it "one of the unsolved mysteries in hadronic physics".〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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