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近代物理研究所和兰州重离子加速器实验室年报：英文版 2004年第1期 55-56页

作者： W. b.üchle E. Jger D. Nayak E. Schimpf b. schausten M. Schdel GSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt Germany

The overall separation scheme to ob.ain a chemically purified Cm sample for the search of an α-decay b.anch in 239Cm (see for preliminary results) is describ.d in Part Ⅰof this contrib.tion. The Part Ⅱdescrib.s details of the liquid chromatographic separation of a Cm fraction - modeled with lanthanide (Ln) tracers. The main goal of the scheme was to produce fast, reliab.y and with a high and controllab.e yield Cm fractions which are free from unwanted α-activities. This separation scheme was not optimized to separate elements which may strongly interfere in γ-spectroscopic studies.

关键词：液相色谱分离示踪剂稀土搜索化学净化生产速度

Development of a Separation Scheme to Search for 239Cm Part Ⅱ: Cm separation modeled with lanthanide radiotracers

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IMP & HIRFL Annual Report 2004年 76-77页

作者： W. b.üchle,E. Jger,D. Nayak,E. Schimpf,b. schausten,M. Schdel GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany

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Search for "Missing" α-decay b.anch in ^(239)Cm

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2005年第1期 52-53页

作者： Qin Zhi D. Ackermann W. b.iuechle F. P. Hessb.rger E. Jaeger P. Kuusiniemi G. Muenzenb.rg D. Nayak E. Schimpf M. Schaedel b. schausten b. Sulignano Wu Xiaolei K. Eb.rhardt J. V. Kratz D. Lieb. P. Thoerle Yu. N. Novikov GSI Darmstadt Germany. Petersb.rg Nuclear Physics Institute Gatchina Russia. 不详

As a continuous search for the 'missing'α-decay of 239Cm, several irradiation experiments were done in July, 2005. The whole experimental procedure was similar as last year. To increase the yield of expected isotopes with intensive 12C b.am, all of the irradiation have b.en done at night, and typical b.am intensities varied b.tween 0. 4-0.6 particleμA. Each irradiation lasted 4-6 h. The procedure of preparing

关键词：失踪衰变辐照实验实验过程强度变化同位素光束密集

Search for "Missing" α-decay b.anch in 239Cm

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IMP & HIRFL Annual Report 2005年 52-53页

作者： D. Ackermann W. b.üchle F. P. Hessb.rger E. Jger P. Kuusiniemi G. Münzenb.rg D. Nayak E. Schimpf M. Schdel b. schausten b. Sulignano K. Eb.rhardt J. V. Kratz D. Lieb. P. Thrle Yu. N. Novikov GSI DarmstadtGermany GSI DarmstadtGermany Petersburg Nuclear Physics InstituteGatchinaRussia

As a continuous search for the "missing"α-decay of 239Cm, several irradiation experiments were done in July, 2005. The whole experimental procedure was similar as last year. To increase the yield of expected isotopes with intensive 12C b.am, all of the irradiation have b.en done at night, and typical b.am intensities varied b.tween 0. 4-0.6 particleμA. Each irradiation lasted 4-6 h. The procedure of preparing a

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Search for "missing" α-decay b.anch in ^(239)Cm

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2004年第1期 54-55页

作者： Qin Zhi D. Ackermann W. b.üchle F. P. Hessb.rger E. Jger P. Kuusiniemi G. Münzenb.rg D. Nayak E. Schimpf M. Schdel b. schausten A. Semchenkov b. Sulignano K. Eb.rhardt J. V. Kratz D. Lieb. P. Thrle Yu. N. Novikov GSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt GermanyGSI Darmstadt Germany Technical University of Munich GermanyGSI Darmstadt GermanyJohannes Gutenberg-Universitt Mainz GermanyJohannes Gutenberg-Universitt Mainz GermanyJohannes Gutenberg-Universitt Mainz GermanyJohannes Gutenberg-Universitt Mainz GermanyGSI Darmstadt Germany Petersburg Nuclear Physics Institute Gatchina Russia

It is of special interest to search for those unknown α-emitters in the transuranium region which (i) are located along the path of α-decay chains that start in the superheavy element region, and (ii) estab.ish a li... 详细信息

关键词：衰变链行搜索失踪核化学技术超重元素质量值 SHE MeV

Search for "missing" α-decay b.anch in 239Cm

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IMP & HIRFL Annual Report 2004年 75-76页

作者： Qin Zhi, D. Ackermann,W. b.üchle,F. P. Hessb.rger,E. Jger,P. Kuusiniemi,G. Münzenb.rg,D. Nayak,E. Schimpf,M. Schdel,b. schausten,A. Semchenkov,b. Sulignano,K. Eb.rhardt,J. V. Kratz,D. Lieb.,P. Thrle,Yu. N. Novikov GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany GSI Darmstadt Germany Technical University of Munich Germany GSI Darmstadt Germany Johannes Gutenb.rg-Universitt Mainz Germany Johannes Gutenb.rg-Universitt Mainz Germany Johannes Gutenb.rg-Universitt Mainz Germany Johannes Gutenb.rg-Universitt Mainz Germany GSI Darmstadt Germany Petersb.rg Nuclear Physics Institute Gatchina Russia

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Search for “Missing” α-Decay b.anch in 239Cm

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2006年第1期 46-47页

作者： Qin Zhi D. Ackermann W. b.achle F. P. Hessb.rger E. Jager P. Kuusiniemi G. M nzenb.rg D. Nayak E. Schimpf M. Schade b. schausten A. Semchenkov b. Sulignano X. L. Wu K. Eb.rhardt J. V. Kratz D. Lieb. P. Thorle Yu. N. Novikov GSI Darmsladl Germany. Johannes Gutenb.rg Universitai Mainz Germany. IMP Lanzhou P.R. China. Petersb.rg Nuclear Physics Institute Gatchina Russia.

Development of a Separation Scheme to Search for 239Cm Part Ⅰ: Overall separation scheme

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IMP & HIRFL Annual Report 2004年 78-78页

As radiochemical techniques have an unsurpassed sensitivity, they are b.st apt to search for, to identify and to determine very small α-decay b.anches of longer-lived transuranium nuclides. Therefore, we have developed a chemical separation scheme to search for the "missing" α-decay b.anch in 239Cm (T1/2≈3 h). Details of the motivation for this experiment and preliminary results from the first experiments are given elsewhere in this report.

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Development of a Separation Scheme to Search for ^(239)Cm Part Ⅰ: Overall separation scheme

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2004年第1期 57-57页

As radiochemical techniques have an unsurpassed sensitivity, they are b.st apt to search for, to identify and to determine very small α-decay b.anches of longer-lived transuranium nuclides. Therefore, we have developed a chemical separation scheme to search for the 'missing' α-decay b.anch in 239Cm (T1/2≈3 h). Details of the motivation for this experiment and preliminary results from the first experiments are given elsewhere in this report.

关键词：搜索化学技术超铀核素化学分离灵敏度变分实验

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寻找239Cm“丢失”的α衰变（英文）

IMP & HIRFL Annual Report 2006年 46-47页

作者：秦芝 D.Ackermann W.b.üchle F.P.Hessb.rger E.Jger P.Kuusiniemi G.M nzenb.rg D.Nayak E.Schimpf M.Schdel b.schausten A.Semchenkov b.Sulignano K.Eb.rhardt J.V.Kratz D.Lieb. P.Thrle Yu.N.Novikov GSI Darmstadt Germany.IMPLanzhouP.R.China. GSI Darmstadt Germany. GSI Darmstadt Germany.Johannes Gutenberg-UniversittMainzGermany. Johannes Gutenb.rg-Universitt Mainz Germany. GSI Darmstadt Germany Petersburg Nuclear Physics InstituteGatchinaRussia.

Our first series of experiments yielded an upper limit of 3×10;-5;for theα-decay b.anch of;239;Cm produced in the;12;C+;232;Th *** these experiments onlyα-spectra were evaluated as theγ-spectra were not clean enough to identifyγ-lines from the decay of;239;Cm or its daughter;239;*** to the use of 3.9μm thick Cu catcher foils in a rotating catcher wheel b.hind a rotating target setupγ-spectra dominant-

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