text: An international collaboration based in this country has produced evidence for bottom-to-down quark transitions and proof of non-kaon CP-violation.
full_question: An international collaboration based in this country has produced evidence for bottom-to-down quark transitions and proof of non-kaon CP-violation. This country, which is home to the Belle experiment, also produced a physicist who discovered the temperature-dependence of resistivity due to electron scattering by magnetic impurities. Another physicist from here theorized that mesons carried the nuclear force, predicting the existence of pions. This country, which contains the KEK laboratory, also houses an underground facility where photomultiplier tubes detect rings of Cherenkov radiation in ultra-pure water. That facility found the first evidence of atmospheric neutrino oscillations and is named the Super-Kamiokande. For 10 points, name this birthplace of Jun Kondo and Hideki Yukawa.
first_sentence: An international collaboration based in this country has produced evidence for bottom-to-down quark transitions and proof of non-kaon CP-violation.
raw_answer: Japan [or Nippon; or Nihon]