2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 16, 347-351 (2003)
DOI: 10.1140/epja/i2002-10102-1

$\chem{(EC+\beta ^{+})}$ decays of the $\mth{11/2^{-}}$ isomer and $\mth{1/2^{+}}$ ground state of $\chem{^{143}Dy}$

S.-W. Xu, Y.-X. Xie, Z.-K. Li, X.-D. Wang, B. Guo, C.-G. Leng, C.-F. Wang and Y. Yu

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, PRC

xsw@ns.lzb.ac.cn

(Received: 20 August 2002 / Revised version: 22 October 2002 / Published online: 18 February 2003)

Abstract
The 1/2+ ground state and a 11/2- isomer of very neutron-deficient isotope $\chem{^{143}Dy}$ were produced by irradiation of an enriched target of $\chem{^{106}Cd}$ with $\chem{^{40}Ca}$ and studied by using a helium-jet fast tape-transport system in combination with proton- $\gamma $, X- $\gamma $ and $\gamma $- $\gamma $ coincidence measurements. A simple ( $\chem{EC+\beta^{+}}$) decay scheme of $\chem{^{143m}Dy}$ with a half-life of 3.0(3) s and a tentative ( $\chem{EC+\beta^{+}}$) decay scheme of $\chem{^{143g}Dy}$ with a half-life of 5.6(10) s are proposed. As a by-product, the 347- and 545-keV $\gamma $ transitions in $\chem{^{138}Sm}$ following the $\beta$-delayed proton emission of $\chem{^{139}Gd}$ decay and the 323-keV $\gamma $ transition in $\chem{^{139}Eu}$ following the $\beta$-delayed proton emission of $\chem{^{140}Tb}$ decay could be observed for the first time.

PACS
23.40.-s - Beta decay; double beta decay; electron and muon capture.
21.10.Tg - Lifetimes.
27.60.+j - $90 \leq A \leq 149$ .

© Società Italiana di Fisica, Springer-Verlag 2003