Search for α decay of 151Eu to the first excited level of 147Pm using underground γ-ray spectrometry

被引：0

作者：

Danevich, F. A. ^{[1
]}

Andreotti, E. ^{[2
]}

Hult, M. ^{[2
]}

Marissens, G. ^{[2
]}

Tretyak, V. I. ^{[1
]}

Yuksel, A. ^{[2
]}

机构：

[1] MSP, Inst Nucl Res, UA-03680 Kiev, Ukraine

[2] European Commiss, Joint Res Ctr, Inst Reference Mat & Measurements, B-2440 Geel, Belgium

来源：

EUROPEAN PHYSICAL JOURNAL A | 2012年 / 48卷 / 11期

关键词：

NUCLEAR-DATA SHEETS;

D O I：

10.1140/epja/i2012-12157-7

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The alpha decay of Eu-151 to the first excited level of Pm-147 (J(pi) = 5/2(+), E-exc = 91.1 keV) was searched for at the HADES underground laboratory (approximate to 500m w.e.). A sample of high-purity europium oxide with mass of 303 g and a natural isotopic composition has been measured over 2232.8 h with a high energy resolution ultra-low background n-type semi-planar HPGe detector (40 cm(3)) with sub-micron deadlayer. The new improved half-life limit has been set as T-1/2 >= 3.7 x 10(18) y at 68% CL. Possibilities to improve the sensitivity of the experiment, which is already near the theoretical predictions, are discussed. New half-life limit for a decay of Eu-153 is also determined as T-1/2 >= 5.5 x 10(17) y.

引用

页数：6