Observation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>3</mml:mn><mml:mi>n</mml:mi></mml:math>Evaporation Channel in the Complete Hot-Fusion Reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Mg</mml:mi><mml:mprescripts/><mml:none/><mml:mn>26</mml:mn></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi>Cm</mml:mi><mml:mprescripts/><mml:none/><mml:mn>248</mml:mn></mml:mmultiscripts></mml:math>Leading to the New Superheavy Nuclide<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Hs</mml:mi><mml:mprescripts/><mml:none/><mml:mn>271</mml:mn></mml:mmultiscripts></mml:math>
J. DvořákTechnische Universität München, D-85748 Garching, GermanyW. BrüchleGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyM. L. ChelnokovJoint Institute for Nuclear Research, 141980 Dubna, Russian FederationCh. E. DüllmannGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyZ. DvorakovaTechnische Universität München, D-85748 Garching, GermanyΚ. EberhardtUniversität Mainz, D-55128 Mainz, GermanyE. JägerGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyR. KrückenTechnische Universität München, D-85748 Garching, GermanyAlexey N. Kuznetsov∥Joint Institute for Nuclear Research, 141980 Dubna, Russian FederationY. NagameJapan Atomic Energy Agency, Tokai, Ibaraki 319-1195, JapanF. NebelTechnische Universität München, D-85748 Garching, GermanyK. NishioJapan Atomic Energy Agency, Tokai, Ibaraki 319-1195, JapanR. C. PeregoTechnische Universität München, D-85748 Garching, GermanyZhi QinGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyM. SchädelGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyΒ. SchaustenGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyE. SchimpfGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyR. SchuberTechnische Universität München, D-85748 Garching, GermanyA. SemchenkovGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyP. ThörleInstitut für Kernchemie, Universität Mainz, D-55128 Mainz, GermanyΑ. TürlerTechnische Universität München, D-85748 Garching, GermanyM. WęgrzeckiInstitute of Electron Technology, 02-668 Warsaw, PolandB. WierczinskiTechnische Universität München, D-85748 Garching, GermanyA. YakushevTechnische Universität München, D-85748 Garching, GermanyA. V. YereminJoint Institute for Nuclear Research, 141980 Dubna, Russian Federation
2008lv
ABI
Abstract
The analysis of a large body of heavy ion fusion reaction data with medium-heavy projectiles (6 < or = Z < or = 18) and actinide targets suggests a disappearance of the 3n exit channel with increasing atomic number of the projectile. Here, we report a measurement of the excitation function of the reaction (248)Cm ((26)Mg,xn)(274-x)Hs and the observation of the new nuclide (271)Hs produced in the 3n evaporation channel at a beam energy well below the Bass fusion barrier with a cross section comparable to the maxima of the 4n and 5n channels. This indicates the possible discovery of new neutron-rich transactinide nuclei using relatively light heavy ion beams of the most neutron-rich stable isotopes and actinide targets.
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Cited by 80 references