Статья

Discovery of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Xe</mml:mi><mml:mprescripts/><mml:none/><mml:mn>109</mml:mn></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Te</mml:mi><mml:mprescripts/><mml:none/><mml:mn>105</mml:mn></mml:mmultiscripts></mml:math>: Superallowed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>Decay near Doubly Magic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Sn</mml:mi><mml:mprescripts/><mml:none/><mml:mn>100</mml:mn></mml:mmultiscripts></mml:math>

S. N. LiddickUNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USAR. GrzywaczDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAC. MazzocchiDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAR. D. PageDepartment of Physics, University of Liverpool, Liverpool L69 7ZE, United KingdomK. P. RykaczewskiPhysics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAJ. C. BatchelderUNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USAC. R. BinghamDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAI. G. DarbyDepartment of Physics, University of Liverpool, Liverpool L69 7ZE, United KingdomG. DraftaDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAC. GoodinDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USAC. J. GrossPhysics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAJ. H. HamiltonDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USAA. A. HechtDepartment of Chemistry, University of Maryland, College Park, Maryland 20742, USAJ. K. HwangDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USAS. IlyushkinDepartment of Physics and Astronomy, Mississippi State, Mississippi 39762, USAD. T. JossDepartment of Physics, University of Liverpool, Liverpool L69 7ZE, United KingdomA. KorgulDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAW. KrólasInstitute of Nuclear Physics, Polish Academy of Sciences, PL 31-342 Kraków, PolandK. LagergrenJoint Institute for Heavy-Ion Research, Oak Ridge, Tennessee 37831, USAK. LiDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USAMohammed Noor TantawyDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USAJames ThomsonDepartment of Physics, University of Liverpool, Liverpool L69 7ZE, United KingdomJ. A. WingerDepartment of Physics and Astronomy, Mississippi State, Mississippi 39762, USA

2006lv

ABI

Аннотация

Two new $\ensuremath{\alpha}$ emitters $^{109}\mathrm{Xe}$ and $^{105}\mathrm{Te}$ were identified through the observation of the $^{109}\mathrm{Xe}\ensuremath{\rightarrow}^{105}\mathrm{Te}\ensuremath{\rightarrow}^{101}\mathrm{Sn}$ $\ensuremath{\alpha}$-decay chain. The $^{109}\mathrm{Xe}$ nuclei were produced in the fusion-evaporation reaction $^{54}\mathrm{Fe}(^{58}\mathrm{Ni},3n)^{109}\mathrm{Xe}$ and studied using the Recoil Mass Spectrometer at the Holifield Radioactive Ion Beam Facility. Two transitions at ${E}_{\ensuremath{\alpha}}=4062\ifmmode\pm\else\textpm\fi{}7\text{ }\text{ }\mathrm{keV}$ and ${E}_{\ensuremath{\alpha}}=3918\ifmmode\pm\else\textpm\fi{}9\text{ }\text{ }\mathrm{keV}$ were interpreted as the $l=2$ and $l=0$ transitions from the $7/{2}^{+}$ ground state in $^{109}\mathrm{Xe}$ (${T}_{1/2}=13\ifmmode\pm\else\textpm\fi{}2\text{ }\text{ }\mathrm{ms}$) to the $5/{2}^{+}$ ground state and a $7/{2}^{+}$ excited state, located at $150\ifmmode\pm\else\textpm\fi{}13\text{ }\text{ }\mathrm{keV}$ in $^{105}\mathrm{Te}$. The observation of the subsequent decay of $^{105}\mathrm{Te}$ marks the discovery of the lightest known $\ensuremath{\alpha}$-decaying nucleus. The measured transition energy ${E}_{\ensuremath{\alpha}}=4703\ifmmode\pm\else\textpm\fi{}5\text{ }\text{ }\mathrm{keV}$ and half-life ${T}_{1/2}=620\ifmmode\pm\else\textpm\fi{}70\text{ }\text{ }\mathrm{ns}$ were used to determine the reduced $\ensuremath{\alpha}$-decay width ${\ensuremath{\delta}}^{2}$. The ratio ${\ensuremath{\delta}}_{^{105}\mathrm{Te}}^{2}/{\ensuremath{\delta}}_{^{213}\mathrm{Po}}^{2}$ of $\ensuremath{\sim}3$ indicates a superallowed character of the $\ensuremath{\alpha}$ emission from $^{105}\mathrm{Te}$.

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Идентификаторы

DOI: 10.1103/physrevlett.97.082501

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Цитирований: 2Использованных источников: 0

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