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2 results on '"Stevenson, P.D."'

1. $\alpha$ decay of $^{159}$Re and proton emission from $^{155}$Ta

Author

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., Département Recherches Subatomiques (DRS-IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
NUCLEI, RADIOACTIVITY, N = 82, NEUTRON-DEFICIENT ISOTOPES, HF-154, DRIP-LINE, 23.50.+z, 23.60.+e, 27.70.+q, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, LIMIT, LU-153
Abstract

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 energies in the region, but disagree with the previously reported decay properties of Ta-155

Published
2007

2. Discovery of the proton emitting nucleus $^{159}$Re

Author

D. T. Joss, I. G. Darby, R. D. Page, J. Uusitalo, S. Eeckhaudt, T. Grahn, P. T. Greenlees, P. M. Jones, R. Julin, S. Juutinen, S. Ketelhut, M. Leino, A.-P. Leppänen, M. Nyman, J. Pakarinen, P. Rahkila, J. Sarén, C. Scholey, A. N. Steer, J. S. Al-Khalili, A. J. Cannon, P. D. Stevenson, S. Ertürk, B. Gall, B. Hadinia, M. Venhart, J. Simpson, Lídia S. Ferreira, Paramasivan Arumugan, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Lídia S. Ferreira, Paramasivan Arumugan, Joss, D.T., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom, STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom -- Darby, I.G., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Page, R.D., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Uusitalo, J., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Eeckhaudt, S., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Grahn, T., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Greenlees, P.T., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Jones, P.M., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Julin, R., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Juutinen, S., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Ketelhut, S., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Leino, M., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Leppänen, A.-P., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Nyman, M., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Pakarinen, J., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Rahkila, P., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Sarén, J., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Scholey, C., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Steer, A.N., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Al-Khalili, J.S., Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom -- Cannon, A.J., Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom -- Stevenson, P.D., Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom -- Ertürk, S., Nigde Universitesi, Fen-Edebiyat Falkültesi, Fizik Bölümü, Nigde, Turkey -- Gall, B., ULP Strasbourg, 23 rue du Loess, 67037 Strasbourg Cedex 2, France -- Hadinia, B., Department of Physics, Royal Institute of Technology, SE-10691, Stockholm, Sweden -- Venhart, M., Department of Nuclear Physics and Biophysics, Comenius University, Mlynska Dolina, 842 48, Bratislava 4, Slovakia -- Simpson, J., STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom, and 0-Belirlenecek

Subjects
Si detectors, nuclear spin, Measured E p, Proton, Hadron, 02 engineering and technology, rhenium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Nuclear physics, Isotopes of cadmium, 0202 electrical engineering, electronic engineering, information engineering, nuclei with mass number 150 to 189, Enriched targets, radioactive decay periods, Nuclide, Isotope, Chemistry, Nuclear structure, 020206 networking & telecommunications, T1/2, 13. Climate action, 020201 artificial intelligence & image processing, 23.50.+z, 27.70.+q, 21.10.Tg, 21.10.Hw, Gas-filled recoil separator, Nucleon, Radioactive decay, Nuclear reactions 58Ni + 106Cd at 300 MeV beam energy, proton emission decay
Abstract

Fund. para Cienc. Tecnol., FCT, Minist. Cienc. Tecnol.;Fundacao Calouste Gulbenkian;Fundacao Luso-Americana, International Conference on Proton Emitting Nuclei and Related Topics, PROCON 2007 -- 17 June 2007 through 23 June 2007 -- Lisbon, The observation of the new nuclide 159Re provides important insights into the evolution of single-particle structure in heavy nuclei beyond the proton drip line. The nuclide 159Re was synthesised in the reaction 106Cd(58Ni, p4n) and identified via its proton radioactivity using the RITU gas-filled separator and the GREAT focal-plane spectrometer. Comparisons of the measured proton energy (Ep = 1805±20 keV) and decay half-life (t1/2 = 21±4 µs) with values calculated using the WKB method indicate that the proton is emitted from an h11/2 state. The implications of these results for future experimental investigations into even more proton unbound Re isotopes using in-flight separation techniques are considered. © 2007 American Institute of Physics.

Published
2007

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