Edinburgh Research Explorer

Observation of the exotic nucleus Tm via its direct proton decay

Research output: Contribution to journalArticle

  • J.C. Batchelder
  • C.R. Bingham
  • K. Rykaczewski
  • K.S. Toth
  • J.A. McKenzie
  • T.N. Ginter
  • C.J. Gross
  • J.W. McConnell
  • E.F. Zganjar
  • J.H. Hamilton
  • W.B. Walters
  • C. Baktash
  • J. Greene
  • J.F. Mas
  • W.T. Milner
  • S.D. Paul
  • D. Shapira
  • X.J. Xu
  • C.H. Yu

Related Edinburgh Organisations

Original languageEnglish
JournalPhysical Review C
Issue number3
Publication statusPublished - 1 Mar 1998


Proton emission from Tm was observed for the first time via the Mo(Ni,p4n) reaction, using the Holifield Radioactive Ion Beam Facility Recoil Mass Spectrometer in conjunction with a double-sided Si strip detector at the focal plane. The measured energy of the emitted proton is 1.728(10) MeV and its half-life is 3.5(10) μs, the shortest ever observed for ground-state proton radioactivity. When compared to the calculated WKB half-life for an l = 5 transfer, the spectroscopic factor is 0.51(16), which is consistent with the value of 0.64 calculated via the BCS approximation for a spherical nucleus. Also, the half-life of Cs was determined with a greater precision than previously available to be 16.7(7) μsec.

ID: 14705209