$\alpha$ decay of $^{159}$Re and proton emission from $^{155}$Ta
- Page, R.D.
- Bianco, L.
- Darby, I.G.
- Uusitalo, J.
- Joss, D.T.
- Grahn, T.
- Herzberg, R.D.
- Pakarinen, J.
- Thomson, J.,
- Eeckhaudt, S.
- Greenlees, P.T.
- Jones, P.M.
- Julin, R.
- Juutinen, S.
- Ketelhut, S.
- Leino, M.
- Leppanen, A.P.
- Nyman, M.
- Rahkila, P.
- Saren, J.
- Scholey, C.
- Steer, A.
- Hornillos, M.B.G.
- Al-Khalili, J.S.
- Cannon, A.J.
- Stevenson, P.D.
- Erturk, S.
- Gall, B.
- Hadinia, B.
- Venhart, M.
- Simpson, J.
DOIAbstract
The alpha decay of Re-159 has been observed for the first time in reactions of 300 MeV Ni-58 ions with an isotopically enriched Cd-106 target. The Re-159 ions were separated in-flight using the RITU separator and implanted into the GREAT spectrometer. The alpha decay emanates from the proton-emitting pi h(11/2) state in Re-159 with an energy of E-alpha=6776 +/- 26 keV and a branching ratio of 7.5 +/- 3.5%. This alpha decay populates a state in the closed neutron shell nucleus Ta-155, which decays by emitting 1444 +/- 15 keV protons with a half-life of 2.9(-1.1)(+1.5) ms. These values are consistent with the emission of the proton from a pi h(11/2) orbital. These results fit in with the systematics of proton and alpha-particle separation ene...
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