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RIKEN Seminar
http://www.riken.jp/en/pr/events/seminars/20190408/
The most important mission of the nuclear physics today is to elucidate the origin and the evolution of matter in the universe, by answering the basic questions how the elementary particles “quarks” are combined to form hadrons such as protons and neutrons, and how the hadrons are combined to form various atomic nuclei. Although ordinary matter (nuclei) is made of up and down quarks, the third type of quarks, “strange quark”, plays particularly important roles to approach these problems.
We are studying “strangeness nuclear physics” by introducing strange quarks into hadrons and nuclei experimentally. In the seminar, our studies at J-PARC on “hypernuclei”, nuclei containing strange quarks, are reviewed. By using intense π and K meson beams we have been investigating structure of various Λ hypernuclei. New experimental data on “doubly strange” nuclei with two strange quarks are also being obtained. Such studies provide key information to understand baryon-baryon interactions (including nuclear force) based on quarks, and then to clarify extremely high density matter in neutron stars where strange quarks are expected to exist stably. Future prospects are also shown, including a plan to extend the hadron facility at J-PARC for further investigation on baryon-baryon interactions and baryon property change in nuclear matter.
Meson Science Laboratory