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2. Quadrupole and octupole collectivity in the semi-magic nucleus 80206Hg126

Author

Morrison, L., primary, Hadyńska-Klȩk, K., additional, Podolyák, Zs., additional, Gaffney, L.P., additional, Zielińska, M., additional, Brown, B.A., additional, Grawe, H., additional, Stevenson, P.D., additional, Berry, T., additional, Boukhari, A., additional, Brunet, M., additional, Canavan, R., additional, Catherall, R., additional, Cederkäll, J., additional, Colosimo, S.J., additional, Cubiss, J.G., additional, De Witte, H., additional, Doherty, D.T., additional, Fransen, Ch., additional, Georgiev, G., additional, Giannopoulos, E., additional, Górska, M., additional, Hess, H., additional, Kaya, L., additional, Kröll, T., additional, Lalović, N., additional, Marsh, B., additional, Martinez Palenzuela, Y., additional, O'Neill, G., additional, Pakarinen, J., additional, Ramos, J.P., additional, Reiter, P., additional, Rodriguez, J.A., additional, Rosiak, D., additional, Rothe, S., additional, Rudigier, M., additional, Siciliano, M., additional, Simpson, E.C., additional, Snall, J., additional, Spagnoletti, P., additional, Thiel, S., additional, Warr, N., additional, Wenander, F., additional, and Zidarova, R., additional

Published
2023
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3. Quadrupole and octupole collectivity in the semi-magic nucleus Hg

Author

Morrison, L., Hadyńska-Klȩk, K., Podolyák, Zs., Gaffney, L.P., Zielińska, M., Brown, B.A., Grawe, H., Stevenson, P.D., Berry, T., Boukhari, A., Brunet, M., Canavan, R., Catherall, R., Cederkäll, J., Colosimo, S.J., Cubiss, J.G., De Witte, H., Doherty, D.T., Fransen, Ch., Georgiev, G., Giannopoulos, E., Górska, M., Hess, H., Kaya, L., Kröll, T., Lalović, N., Marsh, B., Martinez Palenzuela, Y., O'Neill, G., Pakarinen, J., Ramos, J.P., Reiter, P., Rodriguez, J.A., Rosiak, D., Rothe, S., Rudigier, M., Siciliano, M., Simpson, E.C., Snall, J., Spagnoletti, P., Thiel, S., Warr, N., Wenander, F., and Zidarova, R.

Abstract

The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus $^{206}$Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states in $^{206}$Hg were observed. From the data, a reduced transition strength B(E2;21+→01+)=4.4(6) W.u. was determined, the first such value for an N=126 nucleus south of $^{208}$Pb, which is found to be slightly lower than that predicted by shell-model calculations. In addition, a collective octupole state was identified at an excitation energy of 2705 keV, for which a reduced B(E3) transition probability of 30−13+10 W.u. was extracted. These results are crucial for understanding both quadrupole and octupole collectivity in the vicinity of the heaviest doubly-magic nucleus $^{208}$Pb, and for benchmarking a number of theoretical approaches in this key region. This is of particular importance given the paucity of data on transition strengths in this region, which could be used, in principle, to test calculations relevant to the astrophysical r-process.

Published
2023

4. Quadrupole and octupole collectivity in the semi-magic nucleus 80206Hg126

Author

Morrison, L., Hadyńska-Klȩk, K., Podolyák, Zs., Gaffney, L.P., Zielińska, M., Brown, B.A., Grawe, H., Stevenson, P.D., Berry, T., Boukhari, A., Brunet, M., Canavan, R., Catherall, R., Cederkäll, J., Colosimo, S.J., Cubiss, J.G., de Witte, H., Doherty, D.T., Fransen, Ch., Georgiev, G., Giannopoulos, E., Górska, M., Hess, H., Kaya, L., Kröll, T., Lalović, N., Marsh, B., Martinez Palenzuela, Y., O'Neill, G., Pakarinen, J., Ramos, J.P., Reiter, P., Rodriguez, J.A., Rosiak, D., Rothe, S., Rudigier, M., Siciliano, M., Simpson, E.C., Snall, J., Spagnoletti, P., Thiel, S., Warr, N., Wenander, F., Zidarova, R., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus 206Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states in 206Hg were observed. From the data, a reduced transition strength B(E2;21+→01+)=4.4(6) W.u. was determined, the first such value for an N=126 nucleus south of 208Pb, which is found to be slightly lower than that predicted by shell-model calculations. In addition, a collective octupole state was identified at an excitation energy of 2705 keV, for which a reduced B(E3) transition probability of 30−13+10 W.u. was extracted. These results are crucial for understanding both quadrupole and octupole collectivity in the vicinity of the heaviest doubly-magic nucleus 208Pb, and for benchmarking a number of theoretical approaches in this key region. This is of particular importance given the paucity of data on transition strengths in this region, which could be used, in principle, to test calculations relevant to the astrophysical r-process.

Published
2023

5. Quadrupole and octupole collectivity in the semi-magic nucleus [formula omitted]Hg126

Author

Morrison, L., Hadyńska-Klȩk, K., Podolyák, Zs., Gaffney, L.P., Zielińska, M., Brown, B.A., Grawe, H., Stevenson, P.D., Berry, T., Boukhari, A., Brunet, M., Canavan, R., Catherall, R., Cederkäll, J., Colosimo, S.J., Cubiss, J.G., De Witte, H., Doherty, D.T., Fransen, Ch., Georgiev, G., Giannopoulos, E., Górska, M., Hess, H., Kaya, L., Kröll, T., Lalović, N., Marsh, B., Martinez Palenzuela, Y., O'Neill, G., Pakarinen, J., Ramos, J.P., Reiter, P., Rodriguez, J.A., Rosiak, D., Rothe, S., Rudigier, M., Siciliano, M., Simpson, E.C., Snall, J., Spagnoletti, P., Thiel, S., Warr, N., Wenander, F., and Zidarova, R.

Published
2023
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6. The electron–ion scattering experiment ELISe at the International Facility for Antiproton and Ion Research (FAIR)—A conceptual design study

Author

Antonov, A.N., Gaidarov, M.K., Ivanov, M.V., Kadrev, D.N., Aïche, M., Barreau, G., Czajkowski, S., Jurado, B., Belier, G., Chatillon, A., Granier, T., Taieb, J., Doré, D., Letourneau, A., Ridikas, D., Dupont, E., Berthoumieux, E., Panebianco, S., Farget, F., Schmitt, C., Audouin, L., Khan, E., Tassan-Got, L., Aumann, T., Beller, P., Boretzky, K., Dolinskii, A., Egelhof, P., Emling, H., Franzke, B., Geissel, H., Kelic-Heil, A., Kester, O., Kurz, N., Litvinov, Y., Münzenberg, G., Nolden, F., Schmidt, K.-H., Scheidenberger, Ch., Simon, H., Steck, M., Weick, H., Enders, J., Pietralla, N., Richter, A., Schrieder, G., Zilges, A., Distler, M.O., Merkel, H., Müller, U., Junghans, A.R., Lenske, H., Fujiwara, M., Suda, T., Kato, S., Adachi, T., Hamieh, S., Harakeh, M.N., Kalantar-Nayestanaki, N., Wörtche, H., Berg, G.P.A., Koop, I.A., Logatchov, P.V., Otboev, A.V., Parkhomchuk, V.V., Shatilov, D.N., Shatunov, P.Y., Shatunov, Y.M., Shiyankov, S.V., Shvartz, D.I., Skrinsky, A.N., Chulkov, L.V., Danilin, B.V., Korsheninnikov, A.A., Kuzmin, E.A., Ogloblin, A.A., Volkov, V.A., Grishkin, Y., Lisin, V.P., Mushkarenkov, A.N., Nedorezov, V., Polonski, A.L., Rudnev, N.V., Turinge, A.A., Artukh, A., Avdeichikov, V., Ershov, S.N., Fomichev, A., Golovkov, M., Gorshkov, A.V., Grigorenko, L., Klygin, S., Krupko, S., Meshkov, I.N., Rodin, A., Sereda, Y., Seleznev, I., Sidorchuk, S., Syresin, E., Stepantsov, S., Ter-Akopian, G., Teterev, Y., Vorontsov, A.N., Kamerdzhiev, S.P., Litvinova, E.V., Karataglidis, S., Alvarez Rodriguez, R., Borge, M.J.G., Fernandez Ramirez, C., Garrido, E., Sarriguren, P., Vignote, J.R., Fraile Prieto, L.M., Lopez Herraiz, J., Moya de Guerra, E., Udias-Moinelo, J., Amaro Soriano, J.E., Lallena Rojo, A.M., Caballero, J.A., Johansson, H.T., Jonson, B., Nilsson, T., Nyman, G., Zhukov, M., Golubev, P., Rudolph, D., Hencken, K., Jourdan, J., Krusche, B., Rauscher, T., Kiselev, D., Trautmann, D., Al-Khalili, J., Catford, W., Johnson, R., Stevenson, P.D., Barton, C., Jenkins, D., Lemmon, R., Chartier, M., Cullen, D., Bertulani, C.A., and Heinz, A.

Published
2011
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7. Probing dynamics of fusion reactions through cross-section and spin distribution measurement

Author

Kaur Maninder, Behera B.R., Singh Gulzar, Singh Varinderjit, Madhavan N., Muralithar S., Nath S., Gehlot J., Mohanto G., Mukul Ish, Siwal D., Thakur M., Kapoor K., Sharma P., Banerjee T., Jhingan A., Varughese T., Bala Indu, Nayak B.K., Saxena A., Chatterjee M.B., and Stevenson P.D.

Subjects
Physics, QC1-999
Abstract

Present work aims to explicate the effect of entrance channel mass asymmetry on fusion dynamics for the Compound Nucleus 80Sr populated through two different channels, 16O+64Zn and 32S+48Ti, using cross-section and spin distribution measurements as probes. The evaporation spectra studies for these systems, reported earlier indicate the presence of dynamical effects for mass symmetric 32S+48Ti system.The CCDEF and TDHF calculations have been performed for both the systems and an attempt has been made to explain the reported deviations in the α-particle spectrum for the mass symmetric system.

Published
2016
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8. Shape evolutions in fission dynamics within time-dependent Hartree-Fock approach

Author

Pancic, M., Qiang, Y., Pei, J.C, and Stevenson, P.D

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We studied the nuclear shape evolutions in fission process of 240Pu by the time-dependent Hartree- Fock approach with various Skyrme forces. Calculations are performed for the later phase of the fission with large initial deformations towards the scission. We show that calculations with Skyrme forces with large surface energies and large symmetry energies can have extremely long fission evolution time. The symmetry energy plays a role in the evolution of neutron-rich necks. In addition, we also demonstrated the shape oscillations of fission fragments after the fission. We see that particularly the heavy near-spherical fragments have remarkable octupole oscillations.

Published
2020

11. Cause of the charge radius isotope shift at the N=126 shell gap

Author

Goddard P.M., Stevenson P.D., and Rios A.

Subjects
Physics, QC1-999
Abstract

We discuss the mechanism causing the ‘kink’ in the charge radius isotope shift at the N = 126 shell closure. The occupation of the 1i11/2 neutron orbital is the decisive factor for reproducing the experimentally observed kink. We investigate whether this orbital is occupied or not by different Skyrme effective interactions as neutrons are added above the shell closure. Our results demonstrate that several factors can cause an appreciable occupation of the 1i11/2 neutron orbital, including the magnitude of the spin-orbit field, and the isoscalar effective mass of the Skyrme interaction. The symmetry energy of the effective interaction has little influence upon its ability to reproduce the kink.

Published
2014
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15. ? decay of Re159 and proton emission from Ta155

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., Leppänen A.-P., Nyman M., Rahkila P., Sarén J., Scholey C., Steer A., Hornillos M.B.G., Al-Khalili J.S., Cannon A.J., Stevenson P.D., Ertürk S., Gall B., Hadinia B., Venhart M., Simpson J., and Page, R.D., Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Bianco, L., Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Darby, I.G., Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Uusitalo, J., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Joss, D.T., Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom, CCLRC, Daresbury Laboratory, Warrington, Daresbury, WA4 4AD, United Kingdom -- Grahn, T., Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom, Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Herzberg, R.-D., Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Pakarinen, J., Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom, Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Thomson, J., Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Eeckhaudt, S., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Greenlees, P.T., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Jones, P.M., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Julin, R., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Juutinen, S., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Ketelhut, S., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Leino, M., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Leppänen, A.-P., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Nyman, M., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Rahkila, P., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Sarén, J., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Scholey, C., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Steer, A., Department of Physics, University of Jyväskylä, P.O. Box 35, Jyväskylä, FIN-40014, Finland -- Hornillos, M.B.G., CCLRC, Daresbury Laboratory, Warrington, Daresbury, WA4 4AD, United Kingdom -- 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, 7XH, Turkey -- Gall, B., IPHC, CNRS-IN2P3, ULP Strasbourg, 23 rue de Loess, F-67037 Strasbourg cedex 2, France -- Hadinia, B., Royal Institute of Technology, Alba Nova Center, S-106 91 Stockholm, Sweden -- Venhart, M., Department of Nuclear Physics and Biophysics, Comenius University, Mlynska Dolina, 842 48 Bratislava 4, Slovakia -- Simpson, J., CCLRC, Daresbury Laboratory, Warrington, Daresbury, WA4 4AD, United Kingdom

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The ? decay of Re159 has been observed for the first time in reactions of 300 MeV Ni58 ions with an isotopically enriched Cd106 target. The Re159 ions were separated in-flight using the RITU separator and implanted into the GREAT spectrometer. The ? decay emanates from the proton-emitting ?h11/2 state in Re159 with an energy of E?=6776±26 keV and a branching ratio of 7.5 ± 3.5%. This ? decay populates a state in the closed neutron shell nucleus Ta155, 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 ?h11/2 orbital. These results fit in with the systematics of proton and ?-particle separation energies in the region, but disagree with the previously reported decay properties of Ta155. © 2007 The American Physical Society.

Published
2007

16. Identification of a High-Spin Isomer in Mo-99

Author

Liu, Z., Podolyák, Zs., Carpenter, M.P., Walker, P.M., Jones, G.A., Lane, G.J., Chowdhury, P., Carroll, J.J., Kondev, F.G., Williams, S.J., Zhu, S., Regan, P.H., Janssens, R.V.F., Chakrawarthy, R.S., Thompson, N.J., Khoo, T.L., Stevenson, P.D., Seweryniak, D., and Garnsworthy, A.B.

Abstract

A previously unreported isomer has been identified in Mo-99 at an excitation energy of E-x = 3010 keV, decaying with a half-life of T-1/2 = 8(2) ns. The nucleus of interest was produced following fusion-fission reactions between a thick Al-27 target frame and a Hf-178 beam at a laboratory energy of 1150 MeV. This isomeric state is interpreted as an energetically favored, maximally aligned configuration of nu h (11/2) circle times pi(g (9/2))(2).

Published
2007

17. $\alpha$ 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

18. Discovery of 157W and 161Os

Author

Bianco, L., Page, R.D., Darby, I.G., Joss, D.T., Simpson, J., Al-Khalili, J.S., Cannon, A.J., Cederwall, B., Eeckhaudt, S., Ertürk, S., Gall, B., Hornillos, M.B. Gómez, Grahn, T., Greenlees, P.T., Hadinia, B., Heyde, K., Jakobsson, U., Jones, P.M., Julin, R., Juutinen, S., Ketelhut, S., Labiche, M., Leino, M., Leppänen, A.-P., Nyman, M., O'Donnell, D., Paul, E.S., Petri, M., Peura, P., Puurunen, A., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sapple, P.J., Sarén, J., Scholey, C., Smirnova, N.A., Steer, A.N., Stevenson, P.D., Suckling, E.B., Thomson, J., Uusitalo, J., and Venhart, M.

Published
2010
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19. The TDHF code Sky3D

Author

Maruhn, J.A., primary, Reinhard, P.-G., additional, Stevenson, P.D., additional, and Umar, A.S., additional

Published
2014
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21. Spectroscopic calculations of the low-lying structure in exotic Os and W isotopes

Author

Nomura, K., Otsuka, T., Rodríguez-Guzmán, R., Robledo, Luis Miguel, Sarriguren, Pedro, Regan, P.H., Stevenson, P.D., Podolyák, Zs., Nomura, K., Otsuka, T., Rodríguez-Guzmán, R., Robledo, Luis Miguel, Sarriguren, Pedro, Regan, P.H., Stevenson, P.D., and Podolyák, Zs.

Abstract

Structural evolution in neutron-rich Os and W isotopes is investigated in terms of the interacting boson model (IBM) Hamiltonian determined by (constrained) Hartree-Fock-Bogoliubov calculations with the Gogny-D1S energy density functional (EDF). The interaction strengths of the IBM Hamiltonian are produced by mapping the potential energy surface (PES) of the Gogny-EDF with quadrupole degrees of freedom onto the corresponding PES of the IBM system. We examine the prolate-to-oblate shape/phase transition which is predicted to take place in this region as a function of neutron number N within the considered Os and W isotopic chains. The onset of this transition is found to be more rapid compared to the neighboring Pt isotopes. The calculations also allow the prediction of spectroscopic variables (excited state energies and reduced transition probabilities) which are presented for the neutron-rich W192,194,196 nuclei, for which there is only very limited experimental data available to date. © 2011 American Physical Society.

Published
2011

22. Probing the limit of nuclear existence: Proton emission from 159Re

Author

Joss, D.T., primary, Darby, I.G., additional, Page, R.D., additional, Uusitalo, J., additional, Eeckhaudt, S., additional, Grahn, T., additional, Greenlees, P.T., additional, Jones, P.M., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Leino, M., additional, Leppänen, A.-P., additional, Nyman, M., additional, Pakarinen, J., additional, Rahkila, P., additional, Sarén, J., additional, Scholey, C., additional, Steer, A., additional, Cannon, A.J., additional, Stevenson, P.D., additional, Al-Khalili, J.S., additional, Ertürk, S., additional, Venhart, M., additional, Gall, B., additional, Hadinia, B., additional, and Simpson, J., additional

Published
2006
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24. N=Z and proton-rich nuclei in the Hartree-Fock mean field model with a separable nucleon-nucleon interaction.

Author

Rikovska Stone, J., Schofield, K., Stevenson, P.D., Strayer, M.R., and Walters, W.B.

Subjects
HARTREE-Fock approximation, NUCLEAR physics, PROTONS, PARTICLES (Nuclear physics), POTENTIAL energy surfaces
Abstract

A new model for the effective two-body nucleon-nucleon interaction has been recently successful in calculation of ground state properties of spherical, doubly closed shell nuclei from 16O to 208Pb [1] and nuclear matter and neutron star properties [2]. The application of the density dependent finite range separable monopole (SMO) interaction has been now extended to axially symmetrical deformed nuclei [3]. In the present paper we report on HF+BCS calculation of ground-state properties of even-even spherical and deformed N = Z and proton-rich nuclei between the N = Z and the proton-drip line for 28≤Z≤50. The SMO results shown include total energy surfaces and deduced shapes, single-particle energies, two-dimensional distribution of nucleon densities, charge radii and two-proton separation energies. A comparison is made with results obtained using the SkO Skyrme interaction and some other theoretical models as well as with experimental data, where available. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003
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25. Mean field calculation of Ne, Mg and Si nuclei at <f>N=20</f> with the separable monopole interaction

Author

Stevenson, P.D., Rikovska Stone, J., and Strayer, M.R.

Subjects
*QUANTUM perturbations, *QUANTUM theory
Abstract

A new model has been developed to study nuclei using many-body perturbation theory with a density dependent separable monopole nucleon–nucleon interaction (SMO) [Phys. Rev. C 63 (2001) 054309; P.D. Stevenson, D.Ph. Thesis, Oxford 1999; Phys. Rev. C 65 (2002) 064312]. The model is in the zeroth order an alternative to mean-field models based on more conventional effective nucleon–nucleon interactions (e.g., Skyrme, Gogny). Results on shapes and related ground state observables are reported for even–even Ne, Mg, and Si nuclei with N∼20. The model predicts the weakening of the expected N=20 shell closure in Ne isotopes and its disappearance in Mg nuclei in full agreement with experimental results. [Copyright &y& Elsevier]

Published
2002
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26. Nuclear theory at the university of surrey

Author

Al-khalili, J.S., Gelletly, W., Johnson, R.C., Oi, M., Stevenson, P.D., Thompson, I.J., Timofeyuk, N., Tostevin, J.A., Walker, P.M., and Zhao, Q.

Abstract

AbstractThe Centre for Nuclear and Radiation Physics (CNRP) of the Department of Physics at the Uniersity of Surrey hosts the largest nuclear theory activity in the UK. The university is situated in the town of Guildford, 48km SW of London.Theoretical research includes both the structure and reactions of light and exotic-particularly halo-nuclei, as well as the structure of heavy nuclei. Together with the experimental activity, the theory group is part of the newly formed CNRP, which also includes applied nuclear physics for medicine, imaging, and materials characterisation.

Published
2003
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27. Analytic angular momentum coupling coefficient calculators&star;<fn id="fn001"><no>&star;</no>This program can be downloaded from the CPC Program Library under catalogue identifier: http://cpc.cs.qub.ac.uk/summaries/ADQG</fn>

Author

Stevenson, P.D.

Subjects
*JAVA programming language, *CLEBSCH-Gordan coefficients
Abstract

We describe a Java implementation of a suite of programs to calculate analytically Clebsch–Gordan coefficients, and 3j, 6j and 9j symbols used in the quantum theory of angular momentum. [Copyright &y& Elsevier]

Published
2002
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28. Quarry face operations - loading at the face.

Author

Stevenson P.D. and Stevenson P.D.

Abstract

At present there is a choice between several kinds of equipment for face loading in quarries: rope shovels, wheel loaders, crawler machines and hydraulic shovels. The relative merits of these types of equipment are discussed; the design of future equipment will depend on speculation as to the methods of quarrying which will become predominant over the next 10 years., At present there is a choice between several kinds of equipment for face loading in quarries: rope shovels, wheel loaders, crawler machines and hydraulic shovels. The relative merits of these types of equipment are discussed; the design of future equipment will depend on speculation as to the methods of quarrying which will become predominant over the next 10 years.

31. Decays of new nuclides and isomers beyond the proton drip line - The influence of neutron configurations

Author

R. D. Page, L. Bianco, I. G. Darby, D. T. Joss, J. Simpson, J. S. Al-Khalili, A. J. Cannon, R. J. Cooper, S. Eeckhaudt, S. Ertürk, B. Gall, T. Grahn, P. T. Greenlees, B. Hadinia, P. M. Jones, D. S. Judson, R. Julin, S. Juutinen, S. Ketelhut, M. Labiche, M. Leino, A.-P. Leppänen, M. Nyman, D. O’Donnell, P. Rahkila, P. J. Sapple, J. Sarén, C. Scholey, A. N. Steer, P. D. Stevenson, E. B. Suckling, J. Thomson, J. Uusitalo, M. Venhart, Ismail Boztosun, A. B. Balantekin, 0-Belirlenecek, and Page, R.D., Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Bianco, L., Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Darby, I.G., Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Joss, D.T., Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Simpson, J., STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom -- 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 -- Cooper, R.J., Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Eeckhaudt, S., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Ertürk, S., Nigde Universitesi, Fen-Edebiyat Falkultesi, Fizik Bdlumti, Nigde, Turkey -- Gall, B., IPHC, CNRS, IN2P3, ULP Strasbourg, 23 rue de Loess, Strasbourg, 67037, France -- Grahn, T., Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Greenlees, P.T., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Hadinia, B., Royal Institute of Technology, Alba Nova Center, Stockholm, S-106 91, Sweden -- Jones, P.M., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Judson, D.S., Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Julin, R., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Juutinen, S., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Ketelhut, S., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Labiche, M., STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom -- Leino, M., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Leppänen, A.-P., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Nyman, M., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- O'Donnell, D., STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom -- Rahkila, P., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Sapple, P.J., Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Sarén, J., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Scholey, C., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Steer, A.N., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Stevenson, P.D., Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom -- Suckling, E.B., Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom -- Thomson, J., Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Uusitalo, J., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland -- Venhart, M., Department of Physics, University of Jyvdskyld, Jyvdskyld, FIN-40014, Finland

Subjects
Physics, Proton, Gamma ray, Alpha particle, Segmented Si and Ge detectors. Measured E ? ,E proton ,E ? ,T 1/2, Nuclear physics, Nuclear Reactions 58 Ni+ 106 Cd at 290,300,310 MeV beam energy, Beta particle, Neutron, Enriched targets, Nuclide, Alpha decay, Gas-filled recoil separator, Atomic physics, Nuclear Experiment, Ground state
Abstract

Bozok University;Erciyes University;et al.;Istanbul University;Nigde University;The Turkish Atomic Energy Authority (TAEK), International Conference on Nuclear Physics and Astrophysics: From Stable Beams to Exotic Nuclei 2008 -- 25 June 2008 through 30 June 2008 -- -- 139817, The energy of the vh 9/2 orbital in nuclei above N = 82 drops rapidly in energy relative to the vf 7/2 orbital as the occupancy of the ?h 11/2 orbital increases. These two neutron orbitals become nearly degenerate as the proton drip line is approached. In this work, we have discovered the new nuclides 161 Os and 157 W, and studied the decays of the proton emitter 160 Re in detail. The 161 Os and 160 Re nuclei were produced in reactions of 290, 300 and 310 MeV 58 Ni ions with an isotopically enriched 106 Cd target, separated in-flight using the RITU separator and implanted into the GREAT spectrometer. The 161 Os a decays populated the new nuclide 157 W, which decayed by ß-particle emission. The ß decay fed the known ?-decaying l/2 + and 11/2 - states in 157 Ta, which is consistent with a vf 7/2 ground state in 157 W. The measured a-decay energy and half-life for 161 Os correspond to a reduced ?-decay width that is compatible with s-wave ?-particle emission, implying that its ground state is also a vf 7/2 state. Over 7000 160 Re nuclei were produced and the y decays of a new isomeric state feeding the ?d 3/2 level in 160 Re were discovered, but no evidence for the proton or a decay of the expected ?h 11/2 state could be found. The isomer decays offer a natural explanation for this non-observation and provides a striking example of the influence of the near degeneracy of the vh 9/2 and vf 7/2 orbitals on the properties of nuclei in this region. © 2008 American Institute of Physics., Academy of Finland Science and Technology Facilities Council Finnish Centre of Excellence in Atomic Layer Deposition Natural Sciences and Engineering Research Council of Canada, We would like to thank the technical staff at Jyvaskyla for their excellent support and to Paul Morrall from Daresbury Laboratory for making the targets. This work has been supported by the UK Science and Technology Facilities Council; the Swedish Natural Science Research Council; the Academy of Finland under the Finnish Centre of Excellence Programme (project 44875 Nuclear and Condensed Matter Physics Programme at JYFL); the European Union Sixth Framework contract EURONS (RII3-CT-2004-506065) and the European Union Marie Curie Programme (contract HPMT-CT-2001-00250).

Published
2008

32. 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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