Half-Lives of the First Excited States in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Sn</mi></mrow><mrow><mn>117</mn></mrow></msup></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Te</mi></mrow><mrow><mn>121</mn></mrow></msup></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Te</mi></mrow><mrow><mn>123</mn></mrow></msup></mrow></math>, and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Sb</mi></mrow><mrow><mn>123</mn></mrow></msup></mrow></math>

M. Schmorak; A. C. Li; A. Schwarzschild

doi:10.1103/PhysRev.130.727

Half-Lives of the First Excited States in ${Sn}^{117}$ , ${Te}^{121}$ , ${Te}^{123}$ , and ${Sb}^{123}$

M. Schmorak, A. C. Li, and A. Schwarzschild

Phys. Rev. 130, 727 – Published 15 April 1963

Abstract

Half-lives of the first excited states of ${Sn}^{117}$ [161 keV, (0.31±0.03) nsec], ${Te}^{121}$ [214 keV, (0.062±0.015) nsec], ${Te}^{123}$ [159 keV, (0.186±0.020) nsec], and ${Sb}^{123}$ [161 keV, (0.64±0.05) nsec] were measured by the delayed coincidence method. The transitions are predominantly $M 1$ and are retarded by a factor of between 30 and 140 relative to the Weisskopf estimate. The $E 2$ speeds of these transitions are also inferred from published data and vary from 0.1 to 30 times single-particle speed.

Received 5 December 1962

DOI:https://doi.org/10.1103/PhysRev.130.727

Authors & Affiliations

M. Schmorak^*, A. C. Li, and A. Schwarzschild

Brookhaven National Laboratory, Upton, New York

^*Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts.

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Vol. 130, Iss. 2 — April 1963

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