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Observation of the 3$$n$$ evaporation channel in the complete hot-fusion reaction $$^{26}$$Mg + $$^{248}$$Cm leading to the new superheavy nuclide $$^{271}$$Hs

Hot-fusion反応$$^{26}$$Mg+$$^{248}$$Cmにおける3$$n$$蒸発過程の観測; 新しい超重核種$$^{271}$$Hsの合成

Dvorak, J.*; Br$"u$chle, W.*; Chelnokov, M.*; D$"u$llmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; J$"a$ger, E.*; Kr$"u$cken, R.*; Kuznetsov, A.*; 永目 諭一郎; Nebel, F.*; 西尾 勝久; Perego, R.*; Qin, Z.*; Sch$"a$del, M.*; Schausten, B.*; Schimpf, E.*; Schuber, R.*; Semchenkov, A.*; Th$"o$rle, P.*; T$"u$rler, A.*; Wegrzecki, M.*; Wierczinski, B.*; Yakushev, A.*; Yeremin, A.*

Dvorak, J.*; Br$"u$chle, W.*; Chelnokov, M.*; D$"u$llmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; J$"a$ger, E.*; Kr$"u$cken, R.*; Kuznetsov, A.*; Nagame, Yuichiro; Nebel, F.*; Nishio, Katsuhisa; Perego, R.*; Qin, Z.*; Sch$"a$del, M.*; Schausten, B.*; Schimpf, E.*; Schuber, R.*; Semchenkov, A.*; Th$"o$rle, P.*; T$"u$rler, A.*; Wegrzecki, M.*; Wierczinski, B.*; Yakushev, A.*; Yeremin, A.*

$$^{248}$$Cm+$$^{26}$$Mg反応で生成する108番元素ハッシウム(Hs)同位体の生成断面積を迅速気相化学分離装置COMPACTを用いて測定した。入射重イオン$$^{26}$$Mgのエネルギーを変化させ$$^{248}$$Cm($$^{26}$$Mg, $$xn$$)反応の励起関数を求めたところ、比較的軽い重イオンとアクチノイドターゲットを組合せた反応、いわゆるHot-fusion反応での3$$n$$蒸発過程が初めて観測された。この蒸発過程で生成する新しい超重核種$$^{271}$$Hsを同定することに成功した。

The analysis of a large body of heavy ion fusion reaction data with medium-heavy projectiles (6$$leq$$Z$$leq$$18) and actinide targets suggests a disappearance of the 3$$n$$ exit channel with increasing atomic number of the projectile. Here, we report a measurement of the excitation function of the reaction $$^{248}$$Cm($$^{26}$$Mg,$$xn$$)$$^{274-x}$$Hs and the observation of the new nuclide $$^{271}$$Hs produced in the 3$$n$$ evaporation channel at a beam energy well below the Bass fusion barrier with a cross section comparable to the maxima of the 4$$n$$ and 5$$n$$ channels. This indicates the possible discovery of new neutron-rich transactinide nuclei using relatively light heavy ion beams of the most neutron-rich stable isotopes and actinide targets.

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