α decay of the new isotopes <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Th</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>210</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Th</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>211</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

J. Uusitalo; T. Enqvist; M. Leino; W. H. Trzaska; K. Eskola; P. Armbruster; V. Ninov

doi:10.1103/PhysRevC.52.113

α decay of the new isotopes ${}^{210}{Th}$ and ${}^{211}{Th}$

J. Uusitalo, T. Enqvist, M. Leino, W. H. Trzaska, K. Eskola, P. Armbruster, and V. Ninov

Phys. Rev. C 52, 113 – Published 1 July 1995

Abstract

The new neutron-deficient isotopes ${}^{210}{Th}$ and ${}^{211}{Th}$ have been produced in fusion reactions with 5.2–5.7 MeV/nucleon ${}^{35}{Cl}$ ions on ${}^{181}{Ta}$ . The activities were identified on the basis of correlated α decay chains. Fusion evaporation products were separated in-flight using a gas-filled magnetic recoil separator. The measured α energies of ${}^{211}{Th}$ and ${}^{210}{Th}$ are (7792±14) and (7899±17) keV, respectively. The half-lives were found to be ( $37_{- 11}^{+ 28}$ ) ms $(^{211}$ Th) and ( $9_{- 4}^{+ 17}$ ) ms $(^{210}$ Th).