Ca +
Bk fusion reaction leading to element Z = 117; Long-lived
-decaying
Db and discovery of
Lr
Ca+
Bk核融合反応による117番元素の合成;
崩壊する長寿命核種
Db及び
Lrの発見
Khuyagbaatar, J.*; Yakushev, A.*; D
llmann, Ch. E.*; Ackermann, D.*; Andersson, L.-L.*; 浅井 雅人
; Block, M.*; Boll, R. A.*; Brand, H.*; Cox, D. M.*; Dasgupta, M.*; Derkx, X.*; Di Nitto, A.*; Eberhardt, K.*; Even, J.*; Evers, M.*; Fahlander, C.*; Forsberg, U.*; Gates, J. M.*; Gharibyan, N.*; Golubev, P.*; Gregorich, K. E.*; Hamilton, J. H.*; Hartmann, W.*; Herzberg, R.-D.*; He
berger, F. P.*; Hinde, D. J.*; Hoffmann, J.*; Hollinger, R.*; H
bner, A.*; J
ger, E.*; Kindler, B.*; Kratz, J. V.*; Krier, J.*; Kurz, N.*; Laatiaoui, M.*; Lahiri, S.*; Lang, R.*; Lommel, B.*; Maiti, M.*; Miernik, K.*; 南 志都*; Mistry, A.*; Mokry, C.*; Nitsche, H.*; Omtvedt, J. P.*; Pang, G. K.*; Papadakis, P.*; Renisch, D.*; Roberto, J.*; Rudolph, D.*; Runke, J.*; Rykaczewski, K. P.*; Sarmiento, L. G.*; Sch
del, M.; Schausten, B.*; Semchenkov, A.*; Schaughnessy, D. A.*; Steinegger, P.*; Steiner, J.*; Tereshatov, E. E.*; Th
rle-Pospiech, P.*; Tinschert, K.*; Torres De Heidenreich, T.*; Trautmann, N.*; T
rler, A.*; Uusitalo, J.*; Ward, D. E.*; Wegrzecki, M.*; Wiehl, N.*; Van Cleve, S. M.*; Yakusheva, V.*
Khuyagbaatar, J.*; Yakushev, A.*; D
llmann, Ch. E.*; Ackermann, D.*; Andersson, L.-L.*; Asai, Masato; Block, M.*; Boll, R. A.*; Brand, H.*; Cox, D. M.*; Dasgupta, M.*; Derkx, X.*; Di Nitto, A.*; Eberhardt, K.*; Even, J.*; Evers, M.*; Fahlander, C.*; Forsberg, U.*; Gates, J. M.*; Gharibyan, N.*; Golubev, P.*; Gregorich, K. E.*; Hamilton, J. H.*; Hartmann, W.*; Herzberg, R.-D.*; He
berger, F. P.*; Hinde, D. J.*; Hoffmann, J.*; Hollinger, R.*; H
bner, A.*; J
ger, E.*; Kindler, B.*; Kratz, J. V.*; Krier, J.*; Kurz, N.*; Laatiaoui, M.*; Lahiri, S.*; Lang, R.*; Lommel, B.*; Maiti, M.*; Miernik, K.*; Minami, Shizu*; Mistry, A.*; Mokry, C.*; Nitsche, H.*; Omtvedt, J. P.*; Pang, G. K.*; Papadakis, P.*; Renisch, D.*; Roberto, J.*; Rudolph, D.*; Runke, J.*; Rykaczewski, K. P.*; Sarmiento, L. G.*; Sch
del, M.; Schausten, B.*; Semchenkov, A.*; Schaughnessy, D. A.*; Steinegger, P.*; Steiner, J.*; Tereshatov, E. E.*; Th
rle-Pospiech, P.*; Tinschert, K.*; Torres De Heidenreich, T.*; Trautmann, N.*; T
rler, A.*; Uusitalo, J.*; Ward, D. E.*; Wegrzecki, M.*; Wiehl, N.*; Van Cleve, S. M.*; Yakusheva, V.*
ドイツ重イオン研究所のガス充填型反跳核分離装置TASCAを用いて
Ca +
Bk核融合反応で生成する原子番号117の超重元素の観測に成功した。この結果は、過去にロシアのフレーロフ研究所が報告した117番新元素の結果を再確認するもので、117番元素の合成及び発見を確かなものとする成果である。一方、117番元素からの
崩壊連鎖の最後の原子核は、過去に報告された
Dbではなく、未知核種
Lrであり、
Dbは非常に長い寿命を持つ
崩壊核種であることを明らかにした。
The superheavy element with atomic number 117 was produced in the
Ca +
Bk fusion reaction using the gas-filled recoil separator TASCA at GSI in Germany. This result verified the previous result of the discovery of new element 117 reported by Flerov Laboratory of Nuclear Reactions in Russia, which makes certain the synthesis and discovery of element 117 in human history. On the other hand, the last nucleus in the
decay chain from the element 117 was assigned to be the unknown nucleus
Lr instead of the previously reported
Db, and
Db was found to be the
-decaying nucleus with very long half-life.