Eur. Phys. J. A 12, 1-4 (2001)

Short Note

New -delayed proton precursor ¹⁴⁹Yb near the proton drip line

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

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

xsw@ns.lzb.ac.cn

(Received: 14 March 2001 / Revised version: 3 September 2001 Communicated by J. Äystö )

Abstract
The -delayed proton precursor ¹⁴⁹Yb was synthesized in the reaction ¹¹²Sn(⁴⁰Ca, 3n) and identified by using a proton-gamma coincidence measurements in combination with a helium-jet fast tape transport system. Its -delayed proton spectrum was observed. The half-life of ¹⁴⁹Yb was determined to be s. The 253, 101, and 365 keV transitions in ¹⁴⁷Dy, following -delayed proton emission of ¹⁴⁸Ho decay, were reported for the first time.

PACS
23.40.-s - Beta decay; double beta decay; electron and muon capture.
21.10.Tg - Lifetimes.
27.60.+j - .

© Società Italiana di Fisica, Springer-Verlag 2001