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.*; D
llmann, Ch. E.*; Gates, J. M.*; Gregorich, K. E.*; Gross, C. J.*; Herzberg, R.-D.*; He
berger, F. P.*; Khuyagbaatar, J.*; Kratz, J. V.*; Rykaczewski, K.*; Sch
del, M.;
berg, S.*; Ackermann, D.*; Block, M.*; Brand, H.*; Carlsson, B. G.*; Cox, D.*; Derkx, X.*; Eberhardt, K.*; Even, J.*; Fahlander, C.*; Gerl, J.*; J
ger, 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.*; Th
rle-Pospiech, P.*; Torres, T.*; Traut, T.*; Trautmann, N.*; T
rler, 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.*; D
llmann, Ch. E.*; Gates, J. M.*; Gregorich, K. E.*; Gross, C. J.*; Herzberg, R.-D.*; He
berger, F. P.*; Khuyagbaatar, J.*; Kratz, J. V.*; Rykaczewski, K.*; Sch
del, M.;
berg, S.*; Ackermann, D.*; Block, M.*; Brand, H.*; Carlsson, B. G.*; Cox, D.*; Derkx, X.*; Eberhardt, K.*; Even, J.*; Fahlander, C.*; Gerl, J.*; J
ger, 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.*; Th
rle-Pospiech, P.*; Torres, T.*; Traut, T.*; Trautmann, N.*; T
rler, 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.