2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 6, 59-61

Decay of the very neutron-deficient isotope 131Pm

Z.G. Gan - Z. Qin - J.S. Guo - L.J. Shi - H.Y. Liu - T.R. Guo - X.G. Lei - R.C. Ma - W.X. Huang - S.G. Yuan - X.Q. Zhang - G.M. Jin

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R. China

Received: 11 January 1999 / Revised version: 20 May 1999 Communicated by J. Äystö

Abstract
The decay of 131Pm has been investigated by means of $\gamma $-ray spectroscopy. The 131Pm nuclei were produced by fusion-evaporation reaction of 106Cd(32S,3p4n) at the beam energy of 170 MeV. A helium-jet technique and a tape transport system were used to collect the activities and transfer them to a detecting position for X and $\gamma $rays measurement. Two $\gamma $ rays of 185.0 and 220.0 keV were unambiguously identified to follow the $\beta ^{+}$ decay of 131Pm by results of X-$\gamma $ and $\gamma $-$\gamma $ coincidence. A growth-decay feature of the decay curve for 87.8 keV $\gamma $-ray of 131Nd confirmed the production of 131Pm nuclei. The half-life of 131Pm was measured to be 6.3$\pm $0.8 s. A partial decay scheme of 131Pm is proposed on the basis of X-$\gamma $ and $\gamma $ - $\gamma $ coincidence data in this experiment and the known structure information deduced from in-beam experiments of the daughter nucleus 131Nd.

PACS
27.60.+j $90 \le A \le 149$ - 21.10.Tg Lifetimes - 29.30.Kv X- and $\gamma $-ray spectroscopy


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