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Revisit to Two-Proton Radioactivity of 19Mg and Observation of Two-Proton Decay of 30Ar

原子核物理评论 2016年第2期33卷 197-202页

作者：徐晓栋 I.Mukha L.Acosta E.Casarejos A.A.Ciemny W.Dominik J.Duénas-Díaz v.dunin J.M.Espino A.Estradé F.Farinon H.Geissel A.Fomichev T.A.Golubkova A.Gorshkov L.v.Grigorenko Z.Janas G.Kamiński O.Kiselev R.Knbel S.Krupko M.Kuich Yu.A.Litvinov G.Marquinez-Dur'an I.Martel C.Mazzocchi C.Nociforo A.K.Ord'uz M.Pfützner S.Pietri M.Pomorski A.Prochazka S.Rymzhanova A.M.S'anchez-Benítez C.Scheidenberger P.Sharov H.Simon B.Sitar R.Slepnev M.Stanoiu P.Strmen I.Szarka M.Takechi Y.K.Tanaka H.Weick M.Winkler J.S.Winfield Ⅱ.Physikalisches Institut Justus-Liebig-Universitt Gie?en GSI Helmholtzzentrum für Schwerionenforschung Gmb H School of Physics and Nuclear Energy Engineering Beihang University National Research Centre "Kurchatov Institute" INFN Laboratori Nazionali del Sud Instituto de Física Universidad Nacional Autónoma de México University of vigo Faculty of Physics University of Warsaw Department of Applied Physics University of Huelva veksler and Baldin Laboratory of High Energy Physics Department of Atomic Molecular and Nuclear PhysicsUniversity of Seville University of Edinburgh Flerov Laboratory of Nuclear Reactions Advanced Educational and Scientific Center Moscow State University FSBI "SSC RF ITEP"of NRC "Kurchatov Institute" National Research Nuclear University "MEPh I" Institute of Nuclear Physics PAN Faculty of Physics Warsaw University of Technology Faculty of Mathematics and Physics Comenius University IFIN-HH University of Tokyo

An experiment aimed to investigate the two-proton(2p) decay of the previously unknown nucleus ^(30)Ar was performed at GSI. By tracking the decay products in-flight with silicon micro-strip detectors, the 2p decays of ^(30)Ar were observed for the first time. For the calibration purpose, 2p decays of ^(19)Mg were also remeasured by tracking the coincident ^(17)Ne+p+p trajectories. By comparing the measured angular p-17 Ne correlations with those obtained from the corresponding Monte Carlo simulations,the simultaneous 2p decay of ^(19)Mg ground state and the sequential 2p emission of several known excited states of ^(19)Mg were confirmed. One new excited state in ^(19)Mg and two new excited states in ^(18)Na were observed.

关键词： proton drip line decay by proton emission nuclear energy level

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β-delayed Multi-particle Emission From 31^Ar

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原子核物理评论 2016年第2期33卷 221-224页

作者： A. A. Ciemny C. Mazzocchi W. Dominik Z. Janas M. Pfutzner M. Pomorski L. Acosta S. Baraeva E. Casarejos J. Duenas-Daz v. dunin J. M. Espino A. Estrade F. Farinon A. Fomichev H. Geissel A. Gorshkov G. Kaminski O. Kiselev R. Knobel S. Krupko M. Kuich Yu. A. Litvinov G. Marquinez-Duran I. Martel I. Mukha C. Nociforo A. K. Orduz S. Pietri A. Prochazka A. M. Sanchez-Benitez H. Simon B. Sitar R. Slepnev M. Stanoiu P. Strmen I. Szarka M. Takechi Y. Tanaka H. Weick J. S. Winfield Faculty of Physics University of Warsaw 02-093 Warszawa Poland GSI Helmholtzzentrum für Schwerionenforschung 64291 Darmstadt Germany INFN Laboratori Nazionali del Sud Via S. Sofia Catania Italy Instituto de Fisica Universidad Nacional Autonoma de Mexico Mexico D. F. 01000 Mexico Joint Institute for Nuclear Research 141980 Dubna Russia University of vigo 36310 Vigo Spain Department of Applied Physics University of Huelva 21071 Huelva Spain University of Seville 41012 Seville Spain University of Edinburgh EH1 1HT Edinburgh United Kingdom Institute of Nuclear Physics PAN 31-342 Krakow Poland Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Faculty of Physics Warsaw University of Technology 00-662 Warszawa Poland Centro de Fisica Nuclear da Universidade de Lisboa 1649-003 Lisboa Portugal Faculty of Mathematics and Physics Comenius University 84248 Bratislava Slovakia IFIN-HH Post Office Box MG-6 Bucharest Romania University of Tokyo Japan

The β^+ decay of ^(31)Ar was investigated in an experiment at the GSI-FRS *** ions of interest have been produced in the fragmentation of a ^(36)Ar beam at 880 Me v/nucleon and implanted in a time projection chamber with optical readout. In addition to β-delayed one and two proton emission, for the first time the emission of β-delayed 3 protons has been observed. The branching ratio for this decay mode is found to be(0.07 ± 0.02)%.

关键词： 31Ar beta-delayed protons OTPC

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