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⁴⁸Ca+²⁴⁹Bk fusion reaction leading to element Z = 117: long-lived α-decaying ²⁷⁰Db and discovery of ²⁶⁶Lr

Khuyagbaatar, J; Yakushev, A; Düllmann, Ch E; Ackermann, D; Andersson, L-L; Asai, M; Block, M; Boll, R A; Brand, H; Cox, D M; Dasgupta, M; Derkx, X; Di Nitto, A; Eberhardt, K; Even, J; Evers, M; Fahlander, C; Forsberg, U; Gates, J M; Gharibyan, N; Golubev, P; Gregorich, K E; Hamilton, J H; Hartmann, W; Herzberg, R-D; Heßberger, F P; Hinde, David; Hoffmann, J; Hollinger, R; Hübner, A; Jäger, E; Kindler, B; Kratz, J V; Krier, J; Kurz, N; Laatiaoui, M; Lahiri, S; Lang, R; Lommel, B; 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, D; Runke, J; Rykaczewski, K P; Sarmiento, L G; Schädel, M; Schausten, B; 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; Ward, D E; Wegrzecki, M; Wiehl, N; Van Cleve, S M; Yakusheva, V

Description

The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and...[Show more]

dc.contributor.authorKhuyagbaatar, J
dc.contributor.authorYakushev, A
dc.contributor.authorDüllmann, Ch E
dc.contributor.authorAckermann, D
dc.contributor.authorAndersson, L-L
dc.contributor.authorAsai, M
dc.contributor.authorBlock, M
dc.contributor.authorBoll, R A
dc.contributor.authorBrand, H
dc.contributor.authorCox, D M
dc.contributor.authorDasgupta, M
dc.contributor.authorDerkx, X
dc.contributor.authorDi Nitto, A
dc.contributor.authorEberhardt, K
dc.contributor.authorEven, J
dc.contributor.authorEvers, M
dc.contributor.authorFahlander, C
dc.contributor.authorForsberg, U
dc.contributor.authorGates, J M
dc.contributor.authorGharibyan, N
dc.contributor.authorGolubev, P
dc.contributor.authorGregorich, K E
dc.contributor.authorHamilton, J H
dc.contributor.authorHartmann, W
dc.contributor.authorHerzberg, R-D
dc.contributor.authorHeßberger, F P
dc.contributor.authorHinde, David
dc.contributor.authorHoffmann, J
dc.contributor.authorHollinger, R
dc.contributor.authorHübner, A
dc.contributor.authorJäger, E
dc.contributor.authorKindler, B
dc.contributor.authorKratz, J V
dc.contributor.authorKrier, J
dc.contributor.authorKurz, N
dc.contributor.authorLaatiaoui, M
dc.contributor.authorLahiri, S
dc.contributor.authorLang, R
dc.contributor.authorLommel, B
dc.contributor.authorMaiti, M
dc.contributor.authorMiernik, K
dc.contributor.authorMinami, S
dc.contributor.authorMistry, A
dc.contributor.authorMokry, C
dc.contributor.authorNitsche, H
dc.contributor.authorOmtvedt, J P
dc.contributor.authorPang, G K
dc.contributor.authorPapadakis, P
dc.contributor.authorRenisch, D
dc.contributor.authorRoberto, J
dc.contributor.authorRudolph, D
dc.contributor.authorRunke, J
dc.contributor.authorRykaczewski, K P
dc.contributor.authorSarmiento, L G
dc.contributor.authorSchädel, M
dc.contributor.authorSchausten, B
dc.contributor.authorSemchenkov, A
dc.contributor.authorShaughnessy, D A
dc.contributor.authorSteinegger, P
dc.contributor.authorSteiner, J
dc.contributor.authorTereshatov, E E
dc.contributor.authorThörle-Pospiech, P
dc.contributor.authorTinschert, K
dc.contributor.authorTorres De Heidenreich, T
dc.contributor.authorTrautmann, N
dc.contributor.authorTürler, A
dc.contributor.authorUusitalo, J
dc.contributor.authorWard, D E
dc.contributor.authorWegrzecki, M
dc.contributor.authorWiehl, N
dc.contributor.authorVan Cleve, S M
dc.contributor.authorYakusheva, V
dc.date.accessioned2018-11-02T05:02:35Z
dc.date.available2018-11-02T05:02:35Z
dc.identifier.issn0031-9007
dc.identifier.urihttp://hdl.handle.net/1885/148814
dc.description.abstractThe superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope (294)117 and its decay products. A hitherto unknown α-decay branch in (270)Db (Z = 105) was observed, which populated the new isotope (266)Lr (Z = 103). The identification of the long-lived (T(1/2) = 1.0(-0.4)(+1.9) h) α-emitter (270)Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an "island of stability."
dc.description.sponsorshipWe are grateful for GSI’s ECR ion source and UNILAC staff, and the Experimental Electronics department for their continuous support of the experiment. This work was financially supported in part by the German BMBF (05P12UMFNE), the Helmholtz association (VH-NG-723), the Australian and Swedish Research Councils, the U.S. Department of Energy by LLNL (DEAC52-07NA27344), the Laboratory Directed Research and Development Program at LLNL (11-ERD-011) and the Helmholtz Institute Mainz. This work was co-sponsored by the Office of Science, U.S. Department of Energy, and supported under U.S. DOE Grant No. DE-AC05- 00OR22725, and at Vanderbilt DOE Grant No. DEFG05-88ER40407, and the UK Science and Technology Funding Council (STFC). J. M. G., K. E. G., and H. N. were supported by the U.S. Department of Energy, Office of Science, Nuclear Physics, Low Energy Physics Program, through the Lawrence Berkeley National Laboratory under Contract No. DE-AC02-05CH11231.
dc.format.mimetypeapplication/pdf
dc.publisherAmerican Physical Society
dc.rights© 2014 American Physical Society. http://www.sherpa.ac.uk/romeo/issn/0031-9007/..."author can archive publisher's version/PDF" from SHERPA/RoMEO site (as at 2/11/18)
dc.sourcePhysical review letters
dc.title⁴⁸Ca+²⁴⁹Bk fusion reaction leading to element Z = 117: long-lived α-decaying ²⁷⁰Db and discovery of ²⁶⁶Lr
dc.typeJournal article
local.identifier.citationvolume112
dc.date.issued2014-05-02
local.publisher.urlhttps://www.aps.org/
local.type.statusPublished Version
local.contributor.affiliationHinde, D., Research School of Physics & Engineering, The Australian National University
local.identifier.essn1079-7114
local.bibliographicCitation.issue17
local.bibliographicCitation.startpage172501
local.identifier.doi10.1103/PhysRevLett.112.172501
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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