Eur. Phys. J. A (2005) 25: 145-147
https://doi.org/10.1140/epjad/i2005-06-210-2

ENAM 2004

Discovery of the new proton emitter ¹⁴⁴Tm

¹ University of Tennessee, 37996, Knoxville, TN, USA
² Physics Division, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA
³ Institute of Experimental Physics, Warsaw University, PL-00681, Warsaw, Poland
⁴ Joint Institute for Heavy Ion Research, 37831, Oak Ridge, TN, USA
⁵ UNIRIB, Oak Ridge Associated Universities, 37831, Oak Ridge, TN, USA
⁶ Vanderbilt University, 37235, Nashville, TN, USA
⁷ Louisiana State University, 70803, Baton Rouge, LA, USA
⁸ Department of Physics and Astronomy, Mississippi State University, 39762, MS, USA

^* e-mail: grzywacz@mail.phy.ornl.gov

Received: 21 December 2004
Accepted: 18 February 2005
Published online: 15 August 2005

Abstract

Evidence for the proton decay of ¹⁴⁴Tm was found in an experiment at the Recoil Mass Spectrometer at Oak Ridge National Laboratory. The ¹⁴⁴Tm events were found in the weak p5n channel of the fusion reaction using a ⁵⁸Ni beam at 340 MeV on a ⁹²Mo target. The observed proton decay energies are 1.70 MeV and 1.43 MeV and the half-life ∼ 1.9μs. The decay properties suggest proton emission from the dominant πh _11/2 part of the wave function and from the small πf _7/2 admixture coupled to a quadrupole vibration.