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    X-ray pum** of the 229Th nuclear clock isomer

    The metastable first excited state of thorium-229, 229mTh, is just a few electronvolts above the nuclear ground state1–4 and is accessible by vacuum ultraviolet lasers. The ability to manipulate the 229Th nuclear...

    Takahiko Masuda, Akihiro Yoshimi, Akira Fujieda, Hiroyuki Fujimoto… in Nature (2019)