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α-decay of the new isotope<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Po</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>187</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>: Probing prolate structures beyond the neutron mid-shell at N = 104

A. N. AndreyevDepartment of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A-1S6S. AntalicDepartment of Nuclear Physics and Biophysics, Comenius University, Bratislava SK-84248, SlovakiaD. AckermannGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyS. FranchooIPN Orsay, F-91406 Orsay Cedex, FranceF. P. HeßbergerGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyS. HofmannGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyM. HuyseInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumI. KojouharovGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyB. KindlerGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyP. KuusiniemiGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyS. R. LesherInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumB. LommelGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyR. MannGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyG. MünzenbergGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyK. NishioAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, JapanR. D. PageDepartment of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomJ. J. ResslerDepartment of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A-1S6B. ŠtreicherDepartment of Nuclear Physics and Biophysics, Comenius University, Bratislava SK-84248, SlovakiaŠ. ŠáróDepartment of Nuclear Physics and Biophysics, Comenius University, Bratislava SK-84248, SlovakiaB. SulignanoGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyP. Van DuppenInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumD. WisemanDepartment of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomR. WyssDepartment of Physics, Royal Institute of Technology, 104 05 Stockholm, Sweden

2006lv

ABI

Annotatsiya

The new neutron-deficient isotope $^{187}\mathrm{Po}$ has been identified in the complete fusion reaction $^{46}\mathrm{Ti}$+$^{144}\mathrm{Sm}$\ensuremath{\rightarrow}$^{187}\mathrm{Po}$+$3n$ at the velocity filter SHIP. Striking features of the $^{187}\mathrm{Po}$ \ensuremath{\alpha} decay are the strongly-hindered decay to the spherical ground state and unhindered decay to a surprisingly low-lying deformed excited state at 286 keV in the daughter nucleus $^{183}\mathrm{Pb}$. Based on the potential energy surface calculations, the $^{187}\mathrm{Po}$ ground state and the 286 keV excited state in $^{183}\mathrm{Pb}$ were interpreted as being of prolate origin. The systematic deviation of the \ensuremath{\alpha}-decay properties in the lightest odd-A Po isotopes relative to the smooth behavior in the even-A neighbors is discussed. Improved data for the decay of ${}^{187}{\mathrm{Bi}}^{m,g}$ were also obtained.

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DOI: 10.1103/physrevc.73.044324

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