Experimental study of the U-238(S-36,3-5n)(269-271)Hs reaction leading to the observation of (270)Hs

doi:10.1103/PhysRevC.81.061601

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	Experimental study of the U-238(S-36,3-5n)(269-271)Hs reaction leading to the observation of (270)Hs
	Ackermann, D.9; Graeger, R.2; Krier, J.9; Kratz, J. V.7; Kindler, B.9; Khuyagbaatar, J.9; Jaeger, E.9; Huebner, A.9; Hild, D.7; Hessberger, F. P.9
刊名	PHYSICAL REVIEW C
	2010-06-03
卷号	81 期号:6 页码:5
ISSN号	0556-2813
DOI	10.1103/PhysRevC.81.061601
英文摘要	The deformed doubly magic nucleus (270)Hs has so far only been observed as the four-neutron (4n) evaporation residue of the reaction Mg-26+Cm-248, where a maximum cross section of 3 pb was measured. Theoretical studies on the formation of (270)Hs in the 4n evaporation channel of fusion reactions with different entrance channel asymmetry in the framework of a two-parameter Smoluchowski equation predict that the reactions Ca-48+Ra-226 and S-36+U-238 result in higher cross sections due to lower reaction Q values, in contrast to simple arguments based on the reaction asymmetry, which predict opposite trends. Calculations using HIVAP predict cross sections for the reaction S-36+U-238 that are similar to those of the Mg-26+Cm-248 reaction. Here, we report on the first measurement of evaporation residues formed in the complete nuclear fusion reaction S-36+U-238 and the observation of (270)Hs, which is produced in the 4n evaporation channel, with a measured cross section of 0.8(-0.7)(+2.6) pb at 51-MeV excitation energy. The one-event cross-section limits (68% confidence level) for the 3n, 4n, and 5n evaporation channels at 39-MeV excitation energy are 2.9 pb, while the cross-section limits of the 3n and 5n channel at 51 MeV are 1.5 pb. This is significantly lower than the 5n cross section of the Mg-26+Cm-248 reaction at similar excitation energy.
资助项目	German Bundesministerium fur Bildung und Forschung (BMBF)[06MP247I] ; German Bundesministerium fur Bildung und Forschung (BMBF)[06MZ223I] ; Office of High Energy and Nuclear Physics, Nuclear Physics Division, of the US Department of Energy[DE-AC03-76SF00098] ; Norwegian Research Council[148994/V30]
WOS关键词	HEAVIEST NUCLEI ; SUPERHEAVY NUCLEI ; ELEMENTS ; FUSION
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000278399700001
资助机构	German Bundesministerium fur Bildung und Forschung (BMBF) ; Office of High Energy and Nuclear Physics, Nuclear Physics Division, of the US Department of Energy ; Norwegian Research Council
公开日期	2011-04-20
内容类型	期刊论文
源URL	[http://ir.imp.cas.cn/handle/113462/7881]
专题	近代物理研究所_近代物理研究所知识存储（2010之前）
通讯作者	Graeger, R.
作者单位	1.Joint Inst Nucl Res, RU-141980 Dubna, Russia 2.Tech Univ Munich, D-85748 Garching, Germany 3.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 4.Lund Univ, S-22100 Lund, Sweden 5.Univ Oslo, Dept Chem, N-0315 Oslo, Norway 6.Japan Atom Energy Agcy, Ibaraki 3191195, Japan 7.Johannes Gutenberg Univ Mainz, D-55128 Mainz, Germany 8.Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA 9.GSI Helmholtzzentrum Schwerionenforsch, D-642910 Darmstadt, Germany
推荐引用方式 GB/T 7714	Ackermann, D.,Graeger, R.,Krier, J.,et al. Experimental study of the U-238(S-36,3-5n)(269-271)Hs reaction leading to the observation of (270)Hs[J]. PHYSICAL REVIEW C,2010,81(6):5.
APA	Ackermann, D..,Graeger, R..,Krier, J..,Kratz, J. V..,Kindler, B..,...&Kuznetsov, A..(2010).Experimental study of the U-238(S-36,3-5n)(269-271)Hs reaction leading to the observation of (270)Hs.PHYSICAL REVIEW C,81(6),5.
MLA	Ackermann, D.,et al."Experimental study of the U-238(S-36,3-5n)(269-271)Hs reaction leading to the observation of (270)Hs".PHYSICAL REVIEW C 81.6(2010):5.