Nature(London) 573, 238 (2019)

T.Masuda, A.Yoshimi, A.Fujieda, H.Fujimoto, H.Haba, H.Hara, T.Hiraki, H.Kaino, Y.Kasamatsu, S.Kitao, K.Konashi, Y.Miyamoto, K.Okai, S.Okubo, N.Sasao, M.Seto, T.Schumm, Y.Shigekawa, K.Suzuki, S.Stellmer, K.Tamasaku, S.Uetake, M.Watanabe, T.Watanabe, Y.Yasuda, A.Yamaguchi, Y.Yoda, T.Yokokita, M.Yoshimura, K.Yoshimura

X-ray pumping of the ²²⁹Th nuclear clock isomer

RADIOACTIVITY ²²⁹Th(IT); measured decay products, Eγ, Iγ; deduced nuclear resonance scattering curves, active optical pumping into ^229mTh, resonance energy and T_1/2, branching ratios.

doi: 10.1038/s41586-019-1542-3