First prompt in-beam -ray spectroscopy of a superheavy element; The Rf

初めての超重元素即発インビーム線分光実験; Rf

Rubert, J.*; Dorvaux, O.*; Gall, B. J. P.*; Greenlees, P. T.*; Asfari, Z.*; Piot, J.*; Andersson, L. L.*; 浅井 雅人  ; Cox, D. M.*; Dechery, F.*; Grahn, T.*; Hauschild, K.*; Henning, G.*; Herzan, A.*; Herzberg, R.-D.*; Heberger, F. P.*; Jakobsson, U.*; Jones, P.*; Julin, R.*; Juutinen, S.*; Ketelhut, S.*; Khoo, T.-L.*; Leino, M.*; Ljungvall, J.*; Lopez-Martens, A.*; Lozeva, R.*; Nieminen, P.*; Pakarinen, J.*; Papadakis, P.*; Parr, E.*; Peura, P.*; Rahkila, P.*; Rinta-Antila, S.*; Ruotsalainen, P.*; Sandzelius, M.*; Sren, J.*; Scholey, C.*; Seweryniak, D.*; Sorri, J.*; Sulignano, B.*; Theisen, Ch.*; Uusitalo, J.*; Venhart, M.*

Rubert, J.*; Dorvaux, O.*; Gall, B. J. P.*; Greenlees, P. T.*; Asfari, Z.*; Piot, J.*; Andersson, L. L.*; Asai, Masato; Cox, D. M.*; Dechery, F.*; Grahn, T.*; Hauschild, K.*; Henning, G.*; Herzan, A.*; Herzberg, R.-D.*; Heberger, F. P.*; Jakobsson, U.*; Jones, P.*; Julin, R.*; Juutinen, S.*; Ketelhut, S.*; Khoo, T.-L.*; Leino, M.*; Ljungvall, J.*; Lopez-Martens, A.*; Lozeva, R.*; Nieminen, P.*; Pakarinen, J.*; Papadakis, P.*; Parr, E.*; Peura, P.*; Rahkila, P.*; Rinta-Antila, S.*; Ruotsalainen, P.*; Sandzelius, M.*; Sren, J.*; Scholey, C.*; Seweryniak, D.*; Sorri, J.*; Sulignano, B.*; Theisen, Ch.*; Uusitalo, J.*; Venhart, M.*

初めての超重元素即発インビーム線分光実験をRfを対象に行った。MIVOC法を用いた大強度Tiビームの開発を行い、実験を成功させた。Rfの回転励起状態をスピン20 まで観測し、その慣性能率を導出した。これらのデータから、陽子数104には大きな変形閉殻が存在しないことが明らかとなった。

The first prompt in-beam -ray spectroscopy of a superheavy element, Rf, has been performed successfully. A development of an intense isotopically enriched Ti beam using the MIVOC method enabled us to perform this experiment. A rotational band up to a spin of 20 has been discovered in Rf, and its moment of inertia has been extracted. These data suggest that there is no evidence of a significant deformed shell gap at = 104.