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J-PARC

J-PARC (Japan Proton Accelerator Research Complex) is a research facility at Tokai, Japan, which provides most intense proton beam in the world. Many experiments including high-energy and nuclear physics will be performed here. The Q2C group is leading two experiments in the field of strangeness nuclear physics, in which an exotic degree of freedom, strangeness (strange quark), is added to conventional nuclei.

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RHIC-spin

RHIC-spin is an experiment to uncover the mystery of proton spin using spin- polarized protons. Proton is a fundemental particle, a major constituent of our world. It has a spin of 1/2, and naively thought to be composed of three quarks of spin 1/2 -- two spin-up quarks and one spin-down quark. However, past experiments tell us that this naive picture is very poor -- spin of quarks add up to only about 1/4 of nucleon spin. Then, where the rest of the nucleon spin comes from? This question is called the "proton-spin puzzle", and is what we would like to answer by the experiment.

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