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The modified decay width of the radioactive nucleus

Authors:	Il-Tong Cheon

Affiliation:	(1) The Korean Academy of Science and Technology, 7-1 Gumi-dong, 463-808 Bundang-gu, Seongnam-shi, Gyunggi-do, Korea

Abstract:	It is reported that the width of the first excited state ( ${frac{{7^+}}{{2}}}$ , 37.133keV) of ¹²¹ ₅₁Sb embedded in a ZnSb alloy can be modified by reabsorption of γ -rays scattered backward on the platinum (gold) reflector. Its dependence on the reflector shape is also investigated. The decay rate is reduced about 4.5% at a temperature of 4.2K by a platinum spherical reflector of 5mm radius.

Keywords:	21.10.Tg Lifetimes 23.20.Lv γ transitions and level energies 25.20.Dc Photon absorption and scattering 27.60.+j 90 ⩽ A ⩽ 149
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