Ackermann, D.

Andersson, L.-L.

Asai, M.

Block, M.

Boll, R. A.

Brand, H.

Cox, D. M.

Dasgupta, M.

Derkx, X.

Di Nitto, A.

Düllmann, C. E.

Eberhardt, K.

Even, J.

Evers, M.

Fahlander, Claes,

Forsberg, Ulrika

Gates, J. M.

Gharibyan, N.

Golubev, Pavel,

Gregorich, K. E.

Hamilton, J. H.

Hartmann, W.

Herzberg, R.-D.

Heßberger, F.

Hinde, D. J.

Hoffmann, J.

Hollinger, R.

Hübner, A.

Jäger, E.

Khuyagbaatar, J.

Kindler, B.

Kratz, J. V.

Krier, J.

Kurz, N.

Laatiaoui, M.

Lahiri, S.

Lang, R.

Lommel, B.

Lund University.

Maiti, M.

Miernik, K.

Minami, S.

Mistry, A.

Mokry, C.

Nitsche, H.

Omtvedt, J. P.

Pang, G. K.

Papadakis, P.

Renisch, D.

Roberto, J.

Rudolph, Dirk,

Runke, J.

Rykaczewski, K.

Sarmiento, Luis,

Schausten, B.

Schädel, M.

Semchenkov, A.

Shaughnessy, D. A.

Steinegger, P.

Steiner, J.

Tereshatov, E. E.

Thörle-Pospiech, P.

Tinschert, K.

Torres De Heidenreich, T.

Trautmann, N.

Türler, A.

Uusitalo, J.

Van Cleve, S. M.

Ward, Daniel,

Wegrzecki, M.

Wiehl, N.

Yakushev, A.

Yakusheva, V.

Swepub

Study of the 48Ca + 249Bk Fusion Reaction Leading to Element Z = 117: Long-lived Alpha-decaying 270Db and Discovery of 266Lr [Elektronisk resurs]

Fahlander, Claes

Golubev, Pavel

Rudolph, Dirk

Sarmiento, Luis

Ward, Daniel

Lund University Publications

Study of the 48Ca + 249Bk Fusion Reaction Leading to Element Z = 117: Long-lived Alpha-decaying 270Db and Discovery of 266Lr

Fahlander, C.

Forsberg, U.

Golubev, P.

Rudolph, D.

Sarmiento, L. G.

Ward, D. E.

GSI Repository

Study of the 48Ca + 249Bk fusion reaction leading to element Z = 117: long-livedα-decaying 270Db and discovery of 266Lr ∗J. Khuyagbaatar †1,2, A. Yakushev2, Ch.E. Du¨llmann1,2,3, D. Ackermann2, L.-L. Andersson1, M.Asai4, M. Block2, R.A. Boll5, H. Brand2, D.M. Cox6, M. Dasgupta7, X. Derkx1,3, A. Di Nitto3, K.Eberhardt1,3, J. Even1, M. Evers7, C. Fahlander8, U. Forsberg8, J.M. Gates9, N. Gharibyan10, P.Golubev8, K.E. Gregorich9, J.H. Hamilton11, W. Hartmann2, R.-D. Herzberg6, F.P. Heßberger1,2, D.J.Hinde7, J. Hoffmann2, R. Hollinger2, A. Hu¨bner2, E. Ja¨ger2, B. Kindler2, J.V. Kratz3, J. Krier2, N.Kurz2, M. Laatiaoui2, S. Lahiri12, R. Lang2, B. Lommel2, M. Maiti12, K. Miernik5, S. Minami2, A.Mistry6, C. Mokry1,3, H. Nitsche9, J.P. Omtvedt13, G.K. Pang9, P. Papadakis6, D. Renisch3, J.Roberto5, D. Rudolph8, J. Runke2, K. Rykaczewski5, L.G. Sarmiento8, M. Scha¨del2,4, B. Schausten2,A. Semchenkov13, D.A. Shaughnessy10, P. Steinegger14, J. Steiner2, E.E. Tereshatov10, P.Tho¨rle-Pospiech1,3, K. Tinschert2, T. Torres De Heidenreich2, N. Trautmann3, A. Tu¨rler14,15, J.Uusitalo16, D.E. Ward8, M. Wegrzecki17, N. Wiehl1,3, S.M. Van Cleve5, and V. Yakusheva11Helmholtz Institute Mainz, 55099 Mainz, Germany; 2GSI Helmholtzzentrum fu¨r Schwerionenforschung, 64291Darmstadt, Germany; 3Johannes Gutenberg-Universita¨t Mainz, 55099 Mainz, Germany; 4Advanced Science ResearchCenter, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan; 5Oak Ridge National Laboratory, Oak Ridge, TN37831, USA; 6University of Liverpool, Liverpool L69 7ZE, United Kingdom; 7The Australian National University,Canberra, ACT 0200, Australia; 8Lund University, 22100 Lund, Sweden; 9Lawrence Berkeley National Laboratory,Berkeley, CA 94720, USA; 10Lawrence Livermore National Laboratory, Livermore, California 94551, USA;11Vanderbilt University, Nashville, TN 37235, USA; 12Saha Institute of Nuclear Physics, Kolkata 700064, India;13University of Oslo, 0315 Oslo, Norway; 14Paul Scherrer Institute, 5232 Villigen, Switzerland; 15University of Bern,3012 Bern, Switzerland; 16University of Jyva¨skyla¨, 40351 Jyva¨skyla¨, Finland; 17The Institute of Electron Technology,02-668 Warsaw, PolandThe fusion-evaporation reaction 48Ca + 249Bk, was stud-ied at the gas-filled TransActinide Separator and ChemistryApparatus (TASCA) [1], which was significantly upgraded[2] now being able to register nuclei with half-lives fromsub-μs to a few days. We observed four decay chainsamong them two long ones comprising seven α decaysand a spontaneous fission, both chains have similar prop-erties (Fig. 1). Our data is largely consistent with pre-viously reported data [3] on the decay chains assigned to294117. In addition to data from [3], a hitherto unknown αbranch in 270Db, which populated the new isotope 266Lr,was identified.270Db with a half-life of 1.0+1.9−0.4 h is themost long-lived α-decaying nucleus above No (Z = 102).The decay chain members from 290115 to 266Lr all decaywith T1/2 & 1 s, which opens prospects for their chemicalinvestigation and off-line studies.We are grateful to GSI’s ECR ion-source and UNILACstaff, and the Experimental Electronics Department fortheir continuous support of the experiment.∗This work was financially supported in part by the German BMBF(05P12UMFNE), the Swedish Research Council, the U.S. Departmentof Energy by LLNL (DE-AC52-07NA27344), the Laboratory DirectedResearch and Development Program at LLNL (11-ERD-011) and theHelmholtz Institute Mainz. This work was co-sponsored by the Officeof Science, U.S. Department of Energy, and supported under U.S. DOEgrants No. DE-AC05-00OR22725.† J.Khuyagbaatar@gsi.de500 2500 Time (chan / 17ns)α 2α1α 3α4α 5α 6α7SF   11.07(4) 55.9 ms10.31(4)2.98 s9.3(3)5.96 s8.86(3)172 s9.42(3)6.79 s8.84(3)45.1 s135+73.8 h 11.02(4)92.6 ms10.2(2)0.66 s4.64 2.35 s9.05(3)373 s9.47(3)3.53 s8.8(2)41.3 s189 29 h7.89(3)1.3 h7.90(3)1.6 h290115294117286113282Rg278Mt274Bh270Db266Lr10.81-10.9750 ms9.78-10.280.24 s9.61-9.7513 s9.01(5)58 s9.38-9.555.2 s8.76(5)54 sSF 17 hDGFRS500 2500 Time (chan / 17ns)α 2α1α 3α4α 5α 6α7SF chain 1 chain 2TASCAFigure 1: Decay chains assigned to 294117 from this work(together with traces of members) and data from [3].References[1] A. Semchenkov et al., NIM. B 266, 4153 (2008), J.M. Gateset al., PRC 83, 054618 (2011).[2] see GSI Scientific Report-2011, pages-206, 212, 217, 218,251-253 (2012).[3] Yu.Ts. Oganessian et al., PRL. 104, 0142502 (2010), PRC.83, 054315 (2011), PRL. 109, 162501 (2012), PRC. 87,054621 (2013).GSI SCIENTIFIC REPORT 2013 NUSTAR-SHE-01doi:10.15120/GR-2014-1-NUSTAR-SHE-01 125

Study of the $^{48}Ca + ^{249}Bk$ fusion reaction leading to element $Z = 117$: long-lived $\alpha$-decaying $^{270}Db$ and discovery of $^{266}Lr$

http://repository.gsi.de/record/67840/files/NUSTAR-SHE-01.pdf

Study of the $^{48}Ca + ^{249}Bk$ fusion reaction leading to element $Z = 117$ : long-lived $\alpha$ -decaying $^{270}Db$ and discovery of $^{266}Lr$

Abstract

Similar works

Full text

Available Versions

Swepub

Lund University Publications

GSI Repository

Study of the 48Ca+249Bk^{48}Ca + ^{249}Bk48Ca+249Bk fusion reaction leading to element Z=117Z = 117Z=117: long-lived α\alphaα-decaying 270Db^{270}Db270Db and discovery of 266Lr^{266}Lr266Lr

Abstract

Similar works

Full text

Available Versions

Swepub

Lund University Publications

GSI Repository

Study of the $^{48}Ca + ^{249}Bk$ fusion reaction leading to element $Z = 117$ : long-lived $\alpha$ -decaying $^{270}Db$ and discovery of $^{266}Lr$