Alpha-photon coincidence spectroscopy along element 115 decay chains

115番元素の崩壊連鎖に沿った線と光子の同時計数分光

Rudolph, D.*; Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L.-L.*; Di Nitto, A.*; Dllmann, Ch. E.*; Gates, J. M.*; Gregorich, K. E.*; Gross, C. J.*; Herzberg, R.-D.*; Heberger, F. P.*; Khuyagbaatar, J.*; Kratz, J. V.*; Rykaczewski, K.*; Schdel, M.; berg, S.*; Ackermann, D.*; Block, M.*; Brand, H.*; Carlsson, B. G.*; Cox, D.*; Derkx, X.*; Eberhardt, K.*; Even, J.*; Fahlander, C.*; Gerl, J.*; Jger, E.*; Kindler, B.*; Krier, J.*; Kojouharov, I.*; Kurz, N.*; Lommel, B.*; Mistry, A.*; Mokry, C.*; Nitsche, H.*; Omtvedt, J. P.*; Papadakis, P.*; Ragnarsson, I.*; Runke, J.*; Schaffner, H.*; Schausten, B.*; Thrle-Pospiech, P.*; Torres, T.*; Traut, T.*; Trautmann, N.*; Trler, A.*; Ward, A.*; Ward, D. E.*; Wiehl, N.*

Rudolph, D.*; Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L.-L.*; Di Nitto, A.*; Dllmann, Ch. E.*; Gates, J. M.*; Gregorich, K. E.*; Gross, C. J.*; Herzberg, R.-D.*; Heberger, F. P.*; Khuyagbaatar, J.*; Kratz, J. V.*; Rykaczewski, K.*; Schdel, M.; berg, S.*; Ackermann, D.*; Block, M.*; Brand, H.*; Carlsson, B. G.*; Cox, D.*; Derkx, X.*; Eberhardt, K.*; Even, J.*; Fahlander, C.*; Gerl, J.*; Jger, E.*; Kindler, B.*; Krier, J.*; Kojouharov, I.*; Kurz, N.*; Lommel, B.*; Mistry, A.*; Mokry, C.*; Nitsche, H.*; Omtvedt, J. P.*; Papadakis, P.*; Ragnarsson, I.*; Runke, J.*; Schaffner, H.*; Schausten, B.*; Thrle-Pospiech, P.*; Torres, T.*; Traut, T.*; Trautmann, N.*; Trler, A.*; Ward, A.*; Ward, D. E.*; Wiehl, N.*

CaビームとAm標的との核反応で115番元素の同位体を合成し、崩壊連鎖を30事象観測した。観測された崩壊連鎖は過去に115番元素のものとして報告されたものと矛盾が無く、115番元素の同定を再確認した。また線と光子との同時計数測定を合わせて行い、115番元素の崩壊連鎖上に位置する超重核の線およびX線の候補を観測した。最も重い超重核領域での線の観測は、超重核の核構造研究に大きな進歩をもたらすものである。

Produced in the reaction of Ca beam with an Am target, thirty correlated -decay chains were observed. Observed decay chains are consistent with a previously reported decay chain, which confirms the identification of the element 115. In addition, an -photon coincidence measurement was performed, and rays as well as X-ray candidates were observed in this decay chain. The -ray observation in the heaviest region of superheavy nuclei brings a big progress in the superheavy nuclear structure studies.