A new alpha-particle-emitting isotope $\mathsf{^{259}Db}$

Z.G. Gan; Z. Qin; H.M. Fan; X.G. Lei; Y.B. Xu; J.J. He; H.Y. Liu; X.L. Wu; J.S. Guo; X.H. Zhou; S.G. Yuan; G.M. Jin

EPJ

a
b
d
e
ap
st
h
plus

2021 Impact factor 3.131

Hadrons and Nuclei

Eur. Phys. J. A 10, 21-25

A new alpha-particle-emitting isotope $\mathsf{^{259}Db}$

Z.G. Gan, Z. Qin, H.M. Fan, X.G. Lei, Y.B. Xu, J.J. He, H.Y. Liu, X.L. Wu, J.S. Guo, X.H. Zhou, S.G. Yuan and G.M. Jin

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

gzg@ns.lzb.ac.cn
qinzhi@ns.lzb.ac.cn

(Received: 7 December 2000 / Revised version: 19 January 2001 Communicated by W. Henning)

Abstract
An isotope of the element 105 with mass number 259 has been produced via the reaction ²⁴¹Am(²²Ne, 4n)²⁵⁹Db at E_lab =118 MeV. The reaction products were transported and collected using the helium-jet technique and the rotating wheel apparatus. The $\alpha$ -decays of the products and their daughter nuclides were detected by a set of Si(Au) detectors arranged ingeniously. The Z and A of the nuclide have been unambiguously identified by the genetic relationship between the new activity and the known nuclide ²⁵⁵Lr established by $\alpha$ -recoiled milking measurement. The new nuclide ²⁵⁹Db has a half-life of $0.51\pm 0.16$ s and decays by alpha-particle emission of $E_\alpha =9.47$ MeV. Furthermore, the nuclide ²⁵⁸Db and its daughter ²⁵⁴Lr have also been clearly observed using the same projectile-target combination. Their half-lives and $\alpha$ -particle energies determined in this work are in agreement with previous known data, thus also proving the reliability of our assignment of ²⁵⁹Db.