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1. Discovery of W-157 and Os-161

Author

Bianco, L, Page, RD, Darby, IG, Joss, DT, Simpson, J, Al-Khalili, JJ, Cannon, AJ, Cederwall, B, Eeckhaudt, S, Erturk, S, Gall, B, Hornillos, MBG, Grahn, T, Greenlees, PT, Hadinia, B, Heyde, Kristiaan, Jakobsson, U, Jones, PM, Julin, R, Juutinen, S, Ketelhut, S, Labiche, M, Leino, M, Leppanen, AP, Nyman, M, O'Donnell, D, Paul, ES, Petri, M, Peura, P, Puurunen, A, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Sapple, PJ, Saren, J, Scholey, C, Smirnova, NA, Steer, AN, Stevenson, PD, Suckling, EB, Thomson, J, Uusitalo, J, Venhart, M, Scholey, Catherine -- 0000-0002-8743-6071, Stevenson, Paul -- 0000-0003-2645-2569, O'Donnell, David -- 0000-0002-4710-3803, Petri, Marina -- 0000-0002-3740-6106, Cederwall, Bo -- 0000-0003-1771-2656, Darby, Iain -- 0000-0003-2091-2616, Jones, Pete -- 0000-0001-7480-6603, Jakobsson, Ulrika -- 0000-0001-9741-141X, Gomez Hornillos -- 0000-0002-9282-9195, Grahn, Tuomas -- 0000-0002-6255-2279, Peura, Pauli -- 0000-0002-8541-0169, and [Bianco, L. -- Page, R. D. -- Darby, I. G. -- Joss, D. T. -- Grahn, T. -- Paul, E. S. -- Petri, M. -- Sapple, P. J. -- Thomson, J.] Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England -- [Simpson, J. -- Hornillos, M. B. Gomez -- Labiche, M. -- O'Donnell, D.] STFC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Al-Khalili, J. J. -- Cannon, A. J. -- Stevenson, P. D. -- Suckling, E. B.] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England -- [Cederwall, B. -- Hadinia, B. -- Sandzelius, M.] Royal Inst Technol, Alba Nova Ctr, S-10691 Stockholm, Sweden -- [Eeckhaudt, S. -- Greenlees, P. T. -- Jakobsson, U. -- Jones, P. M. -- Julin, R. -- Juutinen, S. -- Ketelhut, S. -- Leino, M. -- Leppanen, A. -P. -- Nyman, M. -- Peura, P. -- Puurunen, A. -- Rahkila, P. -- Ruotsalainen, P. -- Saren, J. -- Scholey, C. -- Steer, A. N. -- Uusitalo, J. -- Venhart, M.] Univ Jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland -- [Erturk, S.] Nigde Univ, Fen Edebiyat Fak, Fizik Bolumu, Nigde, Turkey -- [Gall, B.] ULP Strasbourg, IPHC, CNRS, IN2P3, F-67037 Strasbourg 2, France -- [Heyde, K.] Univ Ghent, Vakgrp Subatomaire Stralingsfysika, B-9000 Ghent, Belgium -- [Smirnova, N. A.] CEN Bordeaux Gradignan, F-33175 Gradignan, France

Subjects
Deduced neutron single-particle configurations in Os-161, W-157, Si detectors, NUCLEI, t(1/2), TOTAL DATA READOUT, Measured E alpha, t(1/2), Shell model calculations, NUCLEAR REACTIONS Ni-58+Cd-106 at 290, Physics and Astronomy, Measured E alpha, Deduced neutron single-particle configurations in Os-161, W-157, NEUTRON-DEFICIENT ISOTOPES, gas-filled recoil separator, PROTON DRIP-LINE, 310 MeV beam energy, NUCLEAR REACTIONS Ni-58+Cd-106 at 290, 300, 310 MeV beam energy, gas-filled recoil separator, Si detectors
Abstract

WOS: 000278933900003, The nuclides W-157 and Os-161 have been discovered ill reactions of Ni-58 ion beams with a Cd-106 target. The Os-161 alpha-decay energy and half-life were 6890 +/- 12 keV and 640 +/- 60 mu s. The daughter W-157 nuclei beta-decayed with a half-life of 275 +/- 40 ms, populating both low-lying alpha-decaying states in Ta-157, which is consistent with a 7/2(-) ground state in W-157. Fine structure observed in the alpha decay of Os-161 places the lowest excited state in W-157 with 1(pi) = 9/2(-) at 318 +/- 30 key. The branching ratio of 5.5(-2.2)(+3.1)% indicates that Os-161 also has a 7/2(-) ground state. Shell-model calculations analysing the effects of monopole shifts and a tensor force on the relative energies of 2f(7/2) and 1h(9/2) neutron states in N = 83 isotones are presented. (C) 2010 Elsevier B.V. All rights reserved., Jyvaskyla; United Kingdom Science and Technology Facilities Council; Swedish Natural Science Research Council; Academy of Finland [44875, 209430, 111965]; European Union [R113-CT-2004-506065, HPMT-CT-2001-00250]; Science and Technology Facilities Council [EP/C015266/1, EP/C015371/1, ST/G008671/1, ST/F012012/1, ST/J000108/1, EP/C543157/1, ST/G008620/1, ST/F012039/1], We thank the accelerator staff at Jyvaskyla for their excellent support and Paul Morrall from Daresbury Laboratory for making the targets. This work was supported by the United Kingdom Science and Technology Facilities Council; the Swedish Natural Science Research Council; the Academy of Finland through the Finnish Centre of Excellence Programme (project 44875 Nuclear and Condensed Matter Physics Programme at JYFL) and support for C.S. (contract 209430) and P.T.G. (contract 111965); the European Union Sixth Framework contract EURONS (R113-CT-2004-506065) and the European Union Marie Curie Programme (contract HPMT-CT-2001-00250).

Published
2010

2. Isomeric and ground-state properties of Pt-171(78), Os-167(76), and W-163(74)

Author

Scholey, C., Andgren, K., Bianco, L., Cederwall, B., Darby, I. G., Eeckhaudt, S., Erturk, S., Hornillos, M. B. Gomez, Grahn, T., Greenlees, P. T., Hadinia, B., Ideguchi, E., Jones, P., Joss, D. T., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Leppanen, A.-P., Nieminen, P., Niikura, M., Nyman, M., O'Donnell, D., Page, R. D., Pakarinen, J., Rahkila, P., Saren, J., Sandzelius, M., Simpson, J., Sorri, J., Thomson, J., Uusitalo, J., Venhart, M., Cederwall, Bo -- 0000-0003-1771-2656, Darby, Iain -- 0000-0003-2091-2616, Niikura, Megumi -- 0000-0002-5940-2667, Scholey, Catherine -- 0000-0002-8743-6071, Pakarinen, Janne -- 0000-0001-8944-8757, O'Donnell, David -- 0000-0002-4710-3803, Grahn, Tuomas -- 0000-0002-6255-2279, Jones, Pete -- 0000-0001-7480-6603, Gomez Hornillos -- 0000-0002-9282-9195, and [Scholey, C. -- Darby, I. G. -- Eeckhaudt, S. -- Grahn, T. -- Greenlees, P. T. -- Jones, P. -- Julin, R. -- Juutinen, S. -- Ketelhut, S. -- Leino, M. -- Leppanen, A.-P. -- Nieminen, P. -- Nyman, M. -- Pakarinen, J. -- Rahkila, P. -- Saren, J. -- Sandzelius, M. -- Sorri, J. -- Uusitalo, J. -- Venhart, M.] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland -- [Andgren, K. -- Cederwall, B. -- Hadinia, B. -- Sandzelius, M.] Royal Inst Technol, S-10691 Stockholm, Sweden -- [Bianco, L. -- Darby, I. G. -- Joss, D. T. -- Page, R. D. -- Thomson, J.] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- [Erturk, S.] Nigde Univ, Dept Phys, TR-51200 Nigde, Turkey -- [Hornillos, M. B. Gomez -- O'Donnell, D. -- Simpson, J.] STFC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Ideguchi, E. -- Niikura, M.] Univ Tokyo, Ctr Nucl Study, Wako, Saitama 3510198, Japan -- [Venhart, M.] Comenius Univ, Dept Nucl Phys & Biophys, Bratislava 84248, Slovakia

Abstract

WOS: 000274002700018, Decay paths, half-lives, and excitation energies of the i(13/2) bandheads of the neutron-deficient nuclei Pt-171, Os-167, and W-163 have been established for the first time. Gamma-ray transitions, X-rays, and internal conversion electrons have been observed, allowing internal-conversion coefficients to be measured and B(M2) reduced transition probabilities to be extracted. These results elucidate the low-lying single-quasiparticle structures and give the energy level spacings between the nu f(7/2), nu h(9/2), and nu i(13/2) quasineutron states for all three nuclei. Moreover, ground-state spin assignments have been made for the first time, along with the measurement of the alpha-decay branching ratio for Pt-171. The decay paths of the i(13/2) bandheads were followed by favored alpha decays, indicating that all three nuclei have the same I-pi = 7/2(-) ground state., Academy of Finland [44875, 213503]; Swedish Research Council; Goran Gustafsson Foundation; EU [HPRI-CT-1999-00044]; EXOTAG [HPRI-1999-CT-50017]; UK Engineering and Physical Sciences Research Council and Science; Technology Facilities Council [209430, 121110, 111965]; Slovak Research and Development Agency [APVV-20-006205]; Science and Technology Facilities Council [EP/C543157/1, EP/C015371/1, EP/C015266/1, ST/J000108/1, ST/G008671/1, ST/F012039/1, ST/G008620/1], This work has been supported by the Academy of Finland under the Finnish Centre of Excellence Programme (Project Nos. 44875 and 213503), the Swedish Research Council, the Goran Gustafsson Foundation, the EU FP5(HPRI-CT-1999-00044) and EXOTAG (HPRI-1999-CT-50017), through the EU-FP6-I3 project EURONS (RII3-CT-2004-506065), and the UK Engineering and Physical Sciences Research Council and Science and Technology Facilities Council. C. S. (209430), P.N. (121110), and P. T. G. (111965) acknowledge the support of the Academy of Finland; V. M., M. S., and I. G. D. acknowledge support from the EC Marie Curie Actions grant; V. M. acknowledges the Slovak Research and Development Agency (Contract No. APVV-20-006205); and E. I. and M. N. support from the JSPS Core-to-Core Program, International Research Network for Exotic Femto Systems. We thank the UK/France (STFC/IN2P3) Loan Pool and GAMMAPOOL European Spectroscopy Resource for the loan of the detectors for JUROGAM and GSI for the loan of the VEGA (1/4018/07) detectors.

Published
2010

3. Competing quasiparticle configurations in W-163

Author

E. S. Paul, P. Rahkila, J. Simpson, Jan Sarén, David O'Donnell, S. Erturk, Paul Greenlees, Matti Leino, P. J. Sapple, M. B. Gomez-Hornillos, Juha Uusitalo, Janne Pakarinen, Peter M. Jones, R. D. Page, T. Grahn, Mikael Sandzelius, Steffen Ketelhut, C. Scholey, L. Bianco, N. Rowley, S. Eeckhaudt, Bo Cederwall, M. Nyman, J. Thomson, R. Julin, Juha Sorri, Baharak Hadinia, Iain Darby, S. Juutinen, D. T. Joss, Pakarinen, Janne -- 0000-0001-8944-8757, Darby, Iain -- 0000-0003-2091-2616, O'Donnell, David -- 0000-0002-4710-3803, Scholey, Catherine -- 0000-0002-8743-6071, Cederwall, Bo -- 0000-0003-1771-2656, Jones, Pete -- 0000-0001-7480-6603, Gomez Hornillos -- 0000-0002-9282-9195, Grahn, Tuomas -- 0000-0002-6255-2279, [Thomson, J. -- Joss, D. T. -- Paul, E. S. -- Bianco, L. -- Darby, I. G. -- Grahn, T. -- Page, R. D. -- Pakarinen, J. -- Sapple, P. J.] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- [Scholey, C. -- Eeckhaudt, S. -- Greenlees, P. T. -- Jones, P. -- Julin, R. -- Juutinen, S. -- Leino, M. -- Nyman, M. -- Rahkila, P. -- Sandzelius, M. -- Saren, J. -- Sorri, J. -- Uusitalo, J.] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland -- [Simpson, J. -- Gomez-Hornillos, M. B. -- O'Donnell, D. -- Rowley, N.] STFC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Erturk, S.] Nigde Univ, Fen Edebiyat Fak, Fizik Bolumu, TR-51100 Nigde, Turkey -- [Cederwall, B. -- Hadinia, B. -- Sandzelius, M.] Royal Inst Technol, Dept Phys, S-10691 Stockholm, Sweden, and 0-Belirlenecek

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Neutron emission, Stable isotope ratio, Excited state, Quasiparticle, Parity (physics), Nuclide, Atomic physics, 0-Belirlenecek, Radioactive decay
Abstract

WOS: 000274002700019, Excited states in the neutron-deficient nuclide W-163 were investigated using the Cd-106(Ni-60, 2pn)W-163 reaction at a beam energy of 270 MeV. The level scheme for W-163 was extended significantly with the observation of five new band structures. The yrast band based on a 13/2(+) isomeric state is extended up to (57/2(+)). Two band structures were established on the 7/2(-) ground state. Quasiparticle configuration assignments for the new band structures were made on the basis of cranked Woods-Saxon shell-model calculations. The results reported in this article suggest that the negative-parity nu(f(7/2), h(9/2)) orbitals are responsible for the first rotational alignment in the yrast band., UK Science and Technology Facilities Council (STFC); EU [506065]; Academy of Finland; Swedish Research Council [111965]; C. S. [209430]; Science and Technology Facilities Council [EP/C015266/1, EP/C015371/1, ST/G008620/1, ST/J000108/1, ST/F012039/1, EP/C543157/1, ST/G008671/1], Financial support for this work has been provided by the UK Science and Technology Facilities Council (STFC), the EU sixth Framework Programme, Integrating Infrastructure Initiative-Transnational Access, (EURONS, Contract No. 506065), the Academy of Finland under the Finnish Centre of Excellence Programme 2006-2011, and by the Swedish Research Council. P. T. G. (Contract No. 111965) and C. S. (Contract No. 209430) acknowledge the support of the Academy of Finland. We thank the UK/France (STFC/IN2P3) Loan Pool and the GAMMAPOOL European Spectroscopy Resource for the loan of detectors for JUROGAM and GSI for the loan of the VEGA detectors. The authors express their gratitude to the staff of the Accelerator Laboratory at the University of Jyvaskyla a for their excellent technical support. The authors also thank Paul Morrall of Daresbury Laboratory for preparation of the Cd targets.

Published
2010

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