Lifetime measurement of the ($\frac{11}{2}^{-}$) isomer in $^{125}$Cs

M. Sugawara; H. Kusakari; T. Murakami; T. Kohno

doi:doi:10.1007/s100500050113

EPJ

Lifetime measurement of the ( $\frac{11}{2}^{-}$ ) isomer in ¹²⁵Cs

M. Sugawara¹ - H. Kusakari² - T. Murakami³ - T. Kohno⁴

¹ Chiba Institute of Technology, Narashino, Chiba 275, Japan
² Faculty of Education, Chiba University, Inage-ku, Chiba 263, Japan
³ Division of Accelerator Physics and Engineering, National Institute of Radiological Sciences, Inage-ku, Chiba 263, Japan
⁴ Department of Energy Sciences, Tokyo Institute of Technology, Midori-ku, Yokohama 226, Japan

Received: 14 April 1998 Communicated by B. Herskind

Abstract
The lifetime of the ( $\frac{11}{2}^{-}$ ) state at 267keV in ¹²⁵Cs was measured. A Ge detector with the transistor reset preamplifier(TRP Ge) was used to measure delayed $\gamma$ -rays under an intense prompt background. The B(M2) value deduced from the lifetime was found to be consistent with the Weisskopf estimate.

PACS
21.10.Tg Lifetimes - 23.20.Js Multipole matrix elements - 27.60.+j $90 \le A \le 149$

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Lifetime measurement of the () isomer in 125Cs

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Lifetime measurement of the ( $\frac{11}{2}^{-}$ ) isomer in ¹²⁵Cs