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Recoil-$$alpha$$-fission and recoil-$$alpha$$-$$alpha$$-fission events observed in the reaction $$^{48}$$Ca + $$^{243}$$Am

$$^{48}$$Ca + $$^{243}$$Am反応で観測された反跳核-$$alpha$$-核分裂及び反跳核-$$alpha$$-$$alpha$$-核分裂相関事象

Forsberg, U.*; Rudolph, D.*; Andersson, L.-L.*; Di Nitto, A.*; D$"u$llmann, Ch. E.*; Fahlander, C.*; Gates, J. M.*; Golubev, P.*; Gregorich, K. E.*; Gross, C. J.*; Herzberg, R.-D.*; He${ss}$berger, F. P.*; Khuyagbaatar, J.*; Kratz, J. V.*; Rykaczewski, K.*; Sarmiento, L. G.*; Sch$"a$del, M.; Yakushev, A.*; ${AA}$berg, S.*; Ackermann, D.*; Block, M.*; Brand, H.*; Carlsson, B. G.*; Cox, D.*; Derkx, X.*; Dobaczewski, J.*; Eberhardt, K.*; Even, J.*; Gerl, J.*; J$"a$ger, E.*; Kindler, B.*; Krier, J.*; Kojouharov, I.*; Kurz, N.*; Lommel, B.*; Mistry, A.*; Mokry, C.*; Nazarewicz, W.*; Nitsche, H.*; Omtvedt, J. P.*; Papadakis, P.*; Ragnarsson, I.*; Runke, J.*; Schaffner, H.*; Schausten, B.*; Shi, Y.*; Th$"o$rle-Pospiech, P.*; Torres, T.*; Traut, T.*; Trautmann, N.*; T$"u$rler, A.*; Ward, A.*; Ward, D. E.*; Wiehl, N.*

Forsberg, U.*; Rudolph, D.*; Andersson, L.-L.*; Di Nitto, A.*; D$"u$llmann, Ch. E.*; Fahlander, C.*; Gates, J. M.*; Golubev, P.*; Gregorich, K. E.*; Gross, C. J.*; Herzberg, R.-D.*; He${ss}$berger, F. P.*; Khuyagbaatar, J.*; Kratz, J. V.*; Rykaczewski, K.*; Sarmiento, L. G.*; Sch$"a$del, M.; Yakushev, A.*; ${AA}$berg, S.*; Ackermann, D.*; Block, M.*; Brand, H.*; Carlsson, B. G.*; Cox, D.*; Derkx, X.*; Dobaczewski, J.*; Eberhardt, K.*; Even, J.*; Gerl, J.*; J$"a$ger, E.*; Kindler, B.*; Krier, J.*; Kojouharov, I.*; Kurz, N.*; Lommel, B.*; Mistry, A.*; Mokry, C.*; Nazarewicz, W.*; Nitsche, H.*; Omtvedt, J. P.*; Papadakis, P.*; Ragnarsson, I.*; Runke, J.*; Schaffner, H.*; Schausten, B.*; Shi, Y.*; Th$"o$rle-Pospiech, P.*; Torres, T.*; Traut, T.*; Trautmann, N.*; T$"u$rler, A.*; Ward, A.*; Ward, D. E.*; Wiehl, N.*

$$^{48}$$Ca + $$^{243}$$Am反応による115番元素合成実験で観測された$$alpha$$崩壊連鎖について、最近我々が報告したドイツGSIで測定したデータと過去に報告されたロシアDubna及び米国LBNLで測定されたデータのすべてを使い、その起源を調査した。それらのデータの中に、反跳核-$$alpha$$-($$alpha$$)-核分裂タイプの短い崩壊連鎖が14事象観測されており、そのうちのいくつかは中性子が2個放出されてできる$$^{289}$$Mc起源であるとこれまで解釈されてきた。一方、今回我々は、これらの短い崩壊連鎖のほとんどが、中性子が3個放出されてできる$$^{288}$$Mc起源であり、崩壊連鎖の途中でEC崩壊して核分裂したものであろうと再同定した。

Alpha-decay chains observed in the element-115 production reactions of $$^{48}$$Ca + $$^{243}$$Am were investigated using a new data set consisting of our recently reported data obtained at GSI and previously reported ones at Dubna and LBNL. Short decay chains of recoil-$$alpha$$-($$alpha$$)-fission type, fourteen of which were observed, and some of which were interpreted as the 2-neutron evaporation products $$^{289}$$Mc, have been reassigned. It is plausible that most of them were assigned to the 3-neutron evaporation products $$^{288}$$Mc whose decay chain would on the way have branches of EC decays followed by fission.

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パーセンタイル:4.76

分野:Physics, Nuclear

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