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98 in multi-nucleon transfer reactions of 
Ca+
CmDevaraja, H. M.*; Heinz, S.*; Beliuskina, O.*; Hofmann, S.*; Hornung, C.*; M
nzenberg, G.*; Ackermann, D.*; Gupta, M.*; Gambhir, Y. K.*; Henderson, R. A.*; et al.
European Physical Journal A, 55(2), p.25_1 - 25_9, 2019/02
被引用回数：12 パーセンタイル：77.09(Physics, Nuclear)The results for nuclei above curium, produced in multi-nucleon transfer reactions of Ca+Cm at the velocity filter SHIP of GSI Darmstadt, are presented. Spontaneous fission and 
activities have been used to study the population of nuclei with lifetimes ranging from few milliseconds to several days. We observed several, relatively neutron-rich isotopes with atomic numbers Z 98; among them a weak 224 millisecond activity which we tentatively attributed to 
No. The measured cross-sections of the observed nuclei give hope that multi-nucleon transfer reactions are a way to reach new neutron-rich heavy and superheavy nuclei, which are not accessible in other reactions. We compare our results with data from earlier experiments and discuss limitations and future perspectives of the method.
Ca + Cm collisions 10% above the Coulomb barrierG
tz, M.*; Gtz, S.*; Kratz, J. V.*; Dllmann, Ch. E.*; Mokry, Ch.*; Runke, J.*; Thrle-Pospiech, P.*; Wiehl, N.*; Sch
del, M.; Ballof, J.*; et al.
Nuclear Physics A, 961, p.1 - 21, 2017/05
被引用回数：6 パーセンタイル：47.01(Physics, Nuclear)Ca + Cmの多核子移行反応の運動学を多層捕集箔法と放射化学分離法を用いて調べた。過去の研究で、生成核の同位体分布の幅が、標的よりも重い同位体より軽い同位体の方が広いことが知られており、標的よりも軽い同位体の方がエネルギーロスの大きな衝突の成分が多いためと解釈されてきた。しかし、本研究で両者の平均的な全運動エネルギー損失、すなわち平均励起エネルギーの大きさが測定され、両者に大きな違いがないことが明らかになった。このことは過去の解釈と矛盾するため、本研究では、高い励起エネルギーを持って生成される標的よりも重い同位体は核分裂によって失われる、という新しい解釈を提案した。
Vermeulen, M. J.; 西尾 勝久; 牧井 宏之; 廣瀬 健太郎; Orlandi, R.; 塚田 和明; 千葉 敏*; Andreyev, A.*
no journal, ,
FFMD are interpreted in terms of symmetric and asymmetric modes. The current work looks at the excitation energy dependence of the FFMD of various actinide nuclei, with the aim to provide more information regarding the distribution of waste products following the transmutation of actinide waste in accelerator driven systems (ADS)The JAEA-Tokai Tandem accelerator facility was utilized for the current work, supplying an 18O beam with an energy of 162 MeV. This beam impinged on a target of 
Np, leading to many excited compound nuclei (CN; 
Np, 
Pu, 
Am), via MNT reactions, which then undergo fission. CN and their excitation energies were identified by detecting ejectiles with a silicon 
E-E telescope. Fission fragments were detected in coincidence with two multi-wire proportional counters (MWPCs), and FFs masses were determined by a kinematic consideration. Preliminary results show the transition from asymmetric fission to asymmetric fission as CN excitation energy increases. All the measured nuclei investigated in this experiment showed similar behavior as will be shown at the meeting.
