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268 results on '"Janne Pakarinen"'

151. In-beam spectroscopy using the JYFL gas-filled magnetic recoil separator RITU

Author

Robert Page, C. Scholey, A. Keenan, Peter M. Jones, Janne Pakarinen, Paivi Nieminen, Pasi Kuusiniemi, T. Enqvist, R. Julin, Andrei Andreyev, S. Juutinen, A-P Leppanen, Matti Leino, K. Eskola, F. P. Hessberger, Paul Greenlees, Heikki Kettunen, P. A. Butler, R-D Herzberg, T. Grahn, P. Rahkila, and Juha Uusitalo

Subjects
Nuclear and High Energy Physics, Fission products, Electron spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Chemistry, Detector, 01 natural sciences, Electron spectroscopy, Nuclear physics, Recoil, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Spectroscopy, Instrumentation, Transuranium element, Separator (electricity)
Abstract

The techniques of recoil-gating and recoil-decay tagging have been employed at Jyvaskyla to perform in-beam γ-ray and electron spectroscopy studies of heavy nuclei. The JUROSPHERE γ-ray array and the SACRED electron spectrometer have been placed at the target position of the JYFL gas-filled recoil separator recoil ion transport unit (RITU). The RITU separator has been used to collect the recoils of interest and separate them from beam particles and fission products. At the focal plane a detector system consisting of time-of-flight and implantation detectors has been used for further event identification. The method and some highlights from the results in the lead region close to the proton drip line and in the transuranium region will be presented and discussed.

Published
2003

152. First observation of gamma-rays from the proton emitter 171Au

Author

D. G. Jenkins, Ramon Wyss, Torbjörn Bäck, Matti Leino, Karin Lagergren, M. Muikku, S. Juutinen, Janne Pakarinen, A. Johnson, D. T. Joss, Bo Cederwall, Peter M. Jones, Pasi Kuusiniemi, D. Karlgren, Juha Uusitalo, A.-P. Leppänen, R. Julin, Heikki Kettunen, A. Keenan, Paivi Nieminen, Paul Greenlees, and Panu Rahkila

Subjects
Physics, Nuclear and High Energy Physics, Proton, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Hadron, Gamma ray, Nuclear physics, medicine.anatomical_structure, medicine, Nuclear fusion, Nuclide, Proton emission, Atomic physics, Nuclear Experiment, Ground state, Nucleus
Abstract

Gamma-rays from the alpha- and proton-unstable nuclide 171Au have been observed for the first time. The gamma-rays were correlated with both a proton- and an alpha-particle decay branch, confirming that the nucleus decays by alpha and proton emission from a single (11/2-) state. The measurement confirms the previously determined half-lives for these particle decays but the present values are of higher precision. In addition, a longer half-life than determined in previous work was measured for the proton-unstable tentative ground state. The results are discussed in relation to structures in neighbouring nuclei and compared with a Strutinsky-type TRS calculation.

Published
2003

153. In-beam spectroscopy at the RITU gas-filled recoil separator

Author

W. Korten, Robert Page, R. D. Humphreys, Pasi Kuusiniemi, A.-P. Leppänen, R. Julin, F. Becker, Y. Le Coz, Juha Uusitalo, J. Gerl, Ch. Theisen, R. Wadsworth, H. Kankaanpää, D. G. Jenkins, K. Hauschild, T. L. Khoo, Heikki Kettunen, J. E. Bastin, T. Page, P. A. Butler, H. J. Wollersheim, S. Juutinen, A. Keenan, J. F. C. Cocks, G. D. Jones, Peter M. Jones, M. Muikku, K. Van de Vel, R-D Herzberg, K. Helariutta, P. Reiter, Matti Leino, K. Eskola, C. Scholey, Paivi Nieminen, E. Bouchez, Janne Pakarinen, F. P. Heßberger, Ch. Schlegel, Andrei Andreyev, P. Rahkila, A. Hürstel, and Paul Greenlees

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, chemistry, Separator (oil production), chemistry.chemical_element, Nuclear fusion, High Energy Physics::Experiment, Germanium, Nuclear Experiment, Spectroscopy, Recoil separator, Semiconductor detector
Abstract

In recent years (1996-2001) the recoil-decay tagging technique has been employed with great success at the Department of Physics of the University of Jyvaskyla. Various arrays of germanium detectors have been coupled to the RITU gas-filled separator in order to study nuclei far from stability. An overview of the physics studied with these arrays, along with discussion of technical development of the RITU separator, is presented. Even with a comparatively modest array of germanium detectors it has been possible to study nuclei produced with cross-sections as low as 200 nb.

Published
2003

154. Isomeric states in proton-unbound 187, 189Bi isotopes

Author

P. Rahkila, A. Hürstel, K. Hauschild, A. Keenan, W. Korten, Juha Uusitalo, Y. Le Coz, T. Enqvist, S. Juutinen, Peter M. Jones, M. Muikku, Paivi Nieminen, Andrei Andreyev, Ch. Theisen, H. Kankaanpää, Matti Leino, Paul Greenlees, M. Rejmund, F. Becker, E. Bouchez, Janne Pakarinen, Heikki Kettunen, Pasi Kuusiniemi, A.-P. Leppänen, and R. Julin

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Proton, Astrophysics::High Energy Astrophysical Phenomena, Hadron, chemistry.chemical_element, Bismuth, Nuclear physics, Recoil, chemistry, Nuclear fusion, Atomic physics, Nuclear Experiment, Spectroscopy
Abstract

Prompt and delayed gamma-ray spectroscopy of very neutron-deficient bismuth isotopes 187, 189Bi has been performed using the Recoil Decay Tagging (RTD) method. The isomeric i 13/2 states have been identified and their lifetimes have been measured. The systematics of these long-lived M2 isomers has been extended to the proton-unbound isotopes. The general behaviour of single-proton states is discussed within the systematics and interpreted within the shell-model framework.

Published
2002

155. In-beam studies of very neutron-deficient heavy nuclei

Author

D. T. Joss, N. S. Kelsall, C. Moore, K. Helariutta, A. N. Andreyev, Heikki Kettunen, W. Korten, P. Van Duppen, S. Juutinen, M. Muikku, Y. Le Coz, Marc Huyse, Peter M. Jones, A. Keenan, M. Leino, H. Kankaanpää, C.D. O'Leary, Pasi Kuusiniemi, A.-P. Leppänen, S.J. Williams, D. G. Jenkins, K. Van de Vel, Panu Rahkila, R. Julin, Janne Pakarinen, Michael Taylor, Juha Uusitalo, A Hurstel, Paul Greenlees, Robert Page, R. Wadsworth, K. Hauschild, Paivi Nieminen, M. B. Smith, and W. Reviol

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Proton, Physics::Instrumentation and Detectors, Yrast, Hadron, Solenoid, Nuclear physics, Nuclear fusion, Neutron, Atomic physics, Nuclear Experiment, Beam (structure)
Abstract

The JYFL gas-filled recoil separator RITU, combined with Ge detector arrays and a SACRED magnetic solenoid spectrometer, has been successfully employed in recoil-decay-tagging (RDT) experiments in order to probe structures of very neutron-deficient heavy nuclei. The present contribution focuses on the light Pb region where the new data extend the systematics of shape-coexisting yrast states towards the proton dripline. Similarities between band structures and their relation to possible multi-particle multi-hole intruder excitations will be discussed.

Published
2002

156. Spectroscopy ofHf161from low to high spin

Author

Kalle Auranen, Joonas Konki, Ulrika Jakobsson, Pauli Peura, J. P. Wrigh, C. McPeake, Juha Sorri, K. Villafani, Philippos Papadakis, Sanna Stolze, A. J. Boston, Catherine Scholey, Mikael Sandzelius, Panu Ruotsalainen, D. T. Joss, Jan Sarén, J. Simpson, Jill S. Baron, J.F. Sharpey-Schafer, F. Wearing, E. S. Paul, Tuomas Grahn, G. J. O'Neill, Jari Partanen, Janne Pakarinen, S. L. Miller, H. Badran, Juha Uusitalo, M. A. Riley, Paul Greenlees, Rauno Julin, T. R. Davis-Merry, Matti Leino, Andrej Herzan, Sakari Juutinen, L. Sinclair, Panu Rahkila, and P. J. R. Mason

Subjects
Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Excited state, Quasiparticle, Side band, Atomic physics, Spectroscopy, Ground state, Spin-½
Abstract

Excited states in the neutron-deficient nucleus $_{72}^{161}\mathrm{Hf}_{89}$ have been populated using the $^{118}\mathrm{Sn}(^{48}\mathrm{Ti},5n)^{161}\mathrm{Hf}$ and $^{110}\mathrm{Pd}(^{56}\mathrm{Fe},5n)^{161}\mathrm{Hf}$ fusion-evaporation reactions at 240 and 270 MeV, respectively. The level scheme for $^{161}\mathrm{Hf}$ has been extended with the observation of new band structures and an ${I}^{\ensuremath{\pi}}=(13/{2}^{+})$ isomeric state with a half-life of 4.8(2) $\ensuremath{\mu}\mathrm{s}$ has been identified. The decay path from this isomer to the $(7/{2}^{\ensuremath{-}})$ ground state is established. The yrast band, based on the $(13/{2}^{+})$ isomeric state, is extended up to $(73/{2}^{+})$ and side band structures are identified up to $(69/{2}^{\ensuremath{-}})$ and $(55/{2}^{\ensuremath{-}})$. Quasiparticle assignments for these rotational structures are made on the basis of their alignment properties and Woods-Saxon cranked shell-model calculations.

Published
2014

157. Spectroscopy of Low-lying States in $^{140}$Sm

Author

A. Damyanova, E. Rapisarda, J. Srebrny, S. Bönig, F. Giacoppo, P. J. Napiorkowski, H. De Witte, J. Samorajczyk, M. Zielińska, A. Tucholski, W. Korten, B. Siebeck, Tamas Gabor Tornyi, K. Hadynska-Klek, R. Szenborn, C. Bauer, N. Warr, F. L. Bello Garrote, T. Marchlewski, Andreas Görgen, A. C. Larsen, Sunniva Siem, P. Hoff, M. J. Vermeulen, T. Abraham, M. Kowalczyk, M. Klintefjord, P. Thöle, P. Reiter, R. Lutter, M. Komorowska, P. Van Duppen, Gry Merete Tveten, E. Grodner, M. Kisieliński, Therese Renstrøm, Ch. Droste, Janne Pakarinen, Anna Stolarz, J. Kownacki, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Physics, ta114, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ddc, nuclear spectrum, Nuclear physics, Physics::Accelerator Physics, Atomic physics, Spectrum analysis, samarium, Spectroscopy, Nuclear Experiment, Lying
Abstract

International audience; Electromagnetic transition strengths and spectroscopic quadrupole moments for Sm-140 were measured by means of multi-step Coulomb excitation with radioactive beam at the ISOLDE facility at CERN. A complementary experiment was performed at the Heavy Ion Laboratory in Warsaw to assign spins for non-yrast states using the angular correlation technique. Based on the new experimental data previous spin assignments need to be revised.

Published
2014

158. Experimental study of12+isomers inAt199,201

Author

Catherine Scholey, Panu Ruotsalainen, Jan Sarén, Tuomas Grahn, Rauno Julin, Juha Uusitalo, Joonas Konki, Pauli Peura, Paul Greenlees, Sanna Stolze, Panu Rahkila, Sakari Juutinen, K. Hauschild, Jari Partanen, Janne Pakarinen, Matti Leino, Mikael Sandzelius, Juha Sorri, Ulrika Jakobsson, Kalle Auranen, and Andrej Herzan

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Computational chemistry, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2014

159. Low-velocity transient-field technique with radioactive ion beams:gfactor of the first excited 2+state in72Zn

Author

P. Reiter, A. Jungclaus, A. Illana, Tomás R. Rodríguez, D. Seiler, B. Siebeck, José Antonio Briz, M. J. Vermeulen, J. L. Egido, D. Voulot, Norbert Pietralla, F. Wenander, Ángel Perea, Janne Pakarinen, C. Bauer, C. Stahl, J. Leske, M. Seidlitz, Mustafa Rajabali, A. Blazhev, Roman Gernhäuser, N. Warr, R. Orlandi, D. Mücher, and H. De Witte

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Isotope, Particle number, Excited state, g-factor, Coulomb excitation, State (functional analysis), Atomic physics, Mixing (physics)
Abstract

The $g$ factor of the first excited ${2}^{+}$ state in ${}^{72}\mathrm{Zn}$ has been measured using the transient-field (TF) technique in combination with Coulomb excitation in inverse kinematics. This experiment presents only the third successful application of the TF method to a short-lived radioactive beam in 10 y, highlighting the intricacies of applying this technique to present and future isotope separator on-line facilities. The significance of the experimental result, $g({2}_{1}^{+})=+0.47(14)$, for establishing the structure of the Zn isotopes near $N=40$ is discussed on the basis of shell-model and beyond-mean-field calculations, the latter accounting for the triaxial degree of freedom, configuration mixing, and particle number and angular momentum projections.

Published
2014

160. Blurring the Boundaries: Decays of Multiparticle Isomers at the Proton Drip Line

Author

Jennifer Simpson, C. Scholey, Paul Greenlees, A.-P. Leppänen, T. Grahn, K. Andgren, M. Nyman, C. Gray-Jones, Rauno Julin, Baharak Hadinia, Iain Darby, D. Seweryniak, Raymond J. Carroll, S. Juutinen, S. Eeckhaudt, Bo Cederwall, Jan Sarén, Robert Page, David O'Donnell, Matti Leino, Juha Uusitalo, Janne Pakarinen, Mikael Sandzelius, Peter M. Jones, P. Rahkila, and D. T. Joss

Subjects
Physics, General Physics, ta114, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, Observable, Parity (physics), total data readout, medicine.anatomical_structure, Physics::Atomic and Molecular Clusters, medicine, great spectrometer, Alpha decay, Nuclide, Physics::Chemical Physics, Atomic physics, Proton emission, Nuclear Experiment, Nucleus
Abstract

A multiparticle spin-trap isomer has been discovered in the proton-unbound nucleus Ta85 73158. The isomer mainly decays by γ-ray emission with a half-life of 6.1(1) μs. Analysis of the γ-ray data shows that the isomer lies 2668 keV above the known 9+ state and has a spin 10 higher and negative parity. This 19- isomer also has an 8644(11) keV, 1.4(2)% α-decay branch that populates the 9+ state in Lu154. No proton-decay branch from the isomer was identified, despite the isomer being unbound to proton emission by 3261(14) keV. This remarkable stability against proton emission is compared with theoretical predictions, and the implications for the extent of observable nuclides are considered. © 2014 American Physical Society.

Published
2014

161. The SAGE spectrometer

Author

J.R. Cresswell, V. F. E. Pucknell, Paul Greenlees, Robert Page, P. J. Coleman-Smith, Joonas Konki, Daniel Cox, J. Sorri, J. Thornhill, Philippos Papadakis, A. K. Mistry, Panu Rahkila, S. C. Letts, D. Wells, J. Simpson, Rauno Julin, I.H. Lazarus, J.A. Sampson, Janne Pakarinen, Mikael Sandzelius, P. A. Butler, D. Seddon, R.-D. Herzberg, E. Parr, and Peter M. Jones

Subjects
Physics, Nuclear and High Energy Physics, Electron spectrometer, Spectrometer, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Nuclear structure, Electron, Nuclear physics, Internal conversion, Excited state, Nuclear fusion, Atomic physics, Nuclear Experiment
Abstract

The SAGE spectrometer has been constructed for in-beam nuclear structure studies. SAGE combines a Ge-detector array and an electron spectrometer for detection of $ \gamma$ -rays and internal conversion electrons, respectively, and allows simultaneous observation of both electrons and $ \gamma$ -rays emitted from excited nuclei. SAGE is set up in the Accelerator Laboratory of the University of Jyvaskyla and works in conjunction with the RITU gas-filled recoil separator and the GREAT focal-plane spectrometer allowing the use of the recoil-decay tagging method.

Published
2014

162. Quadrupole collectivity in neutron-rich Cd isotopes

Author

K. Nowak, G. S. Simpson, Marcus Scheck, Jan Diriken, Roman Gernhäuser, P. G. Thirolf, G. Rainovski, K. Hadyńska-Kęk, Pascal Fernier, C. Bauer, A. Illana Sisón, R. Lutter, B. Siebeck, Tomás R. Rodríguez, M. Thürauf, T. Kröll, D. Voulot, F. Wenander, R. Stegmann, A. Blazhev, D. L. Balabanski, A. Jungclaus, S. Ilieva, Thierry Stora, T. Bloch, S. Bönig, A. Negret, M. J. Vermeulen, D. Deleanu, Janne Pakarinen, M. Seidlitz, M. von Schmid, N. Warr, R. Orlandi, H. De Witte, Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Lunardi, S, Bizzeti, PG, Kabana, S, Bucci, C, Chiari, M, Dainese, A, DiNezza, P, Menegazzo, R, Nannini, A, Signorini, C, and ValienteDobon, JJ

Subjects
Physics, Isotope, QC1-999, Coulomb excitation, Prolate spheroid, Astrophysics, 7. Clean energy, Semiconductor detector, Transition strength, Quadrupole, Neutron, Atomic physics, Nuclear Experiment, Excitation
Abstract

4 pags., 2 figs. -- INPC 2013 – International Nuclear Physics Conference, The investigation of the excitation energies of the 21+ –states in the neutron-rich Cd isotopes shows an irregular behaviour when approaching the neutron shell-closure at N = 82. The energy of the 21+–state in 128Cd is lower than the one in 126Cd. The transition strength B(E2, 0gs+ → 21+) in the even isotopes 122−128Cd was measured in Coulomb excitation experiments with the high-purity germanium detector array MINIBALL at REXISOLDE (CERN). The values for 122,124Cd coincide with beyond-mean-field calculations with a resultant prolate deformation, whereas 126,128Cd are better described by shell-model calculations., This project is supported by BMBF (No. 06 DA 9036I, No. 05 P12 RDCIA, No. 05 P12 RDCIB and No. 05 P12 PKFNE), HIC for FAIR, EU through EURONS (No. 506065) and ENSAR (No. 262010) and the MINIBALL and REX-ISOLDE collaborations.

Published
2014

163. Shape coexistence in neutron-deficient Hg isotopes studied via lifetime measurements inHg184,186and two-state mixing calculations

Author

Mark Huyse, W. Rother, Tuomas Grahn, C. J. Chiara, Robert Page, F. G. Kondev, A. Dewald, R. V. F. Janssens, S. Zhu, Janne Pakarinen, Marcus Scheck, N. Bree, P. Van Duppen, Rauno Julin, K. Wrzosek-Lipska, M. Hackstein, Liam Gaffney, H. V. Watkins, D. T. Joss, M. P. Carpenter, P. F. Bertone, Paivi Nieminen, P. A. Butler, F. Filmer, Susan Rigby, Raymond J. Carroll, and C. Fransen

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Yrast, Moment of inertia, 7. Clean energy, 01 natural sciences, Recoil, Amplitude, 0103 physical sciences, Neutron, Gammasphere, Atomic physics, Nuclear Experiment, 010306 general physics, Mixing (physics)
Abstract

The neutron-deficient mercury isotopes, $^{184,186}$Hg, were studied with the Recoil Distance Doppler Shift (RDDS) method using the Gammasphere array and the Koln Plunger device. The Differential Decay Curve Method (DDCM) was employed to determine the lifetimes of the yrast states in $^{184,186}$Hg. An improvement on previously measured values of yrast states up to $8^{+}$ is presented as well as first values for the $9_{3}$ state in $^{184}$Hg and $10^{+}$ state in $^{186}$Hg. $B(E2)$ values are calculated and compared to a two-state mixing model which utilizes the variable moment of inertia (VMI) model, allowing for extraction of spin-dependent mixing strengths and amplitudes.

Published
2014

164. Coulomb excitation of Na-29,Na-30: Mapping the borders of the island of inversion

Author

D. Schneiders, Thomas Davinson, T. Steinbach, N. Warr, Janne Pakarinen, P. Reiter, P. J. Woods, N. Kesteloot, B. Bastin, R. Altenkirch, T. Kröll, Mark Huyse, R. Gernhäuser, C. Bauer, N. Bree, H. De Witte, F. Radeck, R. Krücken, Fredrik Wenander, Jan Diriken, K. Geibel, B. Bruyneel, A. Blazhev, Jan Taprogge, K. Wrzosek-Lipska, Georgi P. Georgiev, B. Siebeck, M. Seidlitz, Kathrin Wimmer, Joakim Cederkäll, P. A. Butler, J. Van de Walle, Douglas D. DiJulio, Marcus Scheck, R. Lutter, C. Sotty, D. Voulot, P. Van Duppen, Liam Gaffney, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Research unit Nuclear & Hadron Physics

Subjects
Physics, Nuclear and High Energy Physics, region, ta114, Spectrometer, 010308 nuclear & particles physics, Island of inversion, shell-model, Nuclear Theory, Gamma ray, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, nuclear-data sheets, Excited state, 0103 physical sciences, Physics::Accelerator Physics, Atomic physics, 010306 general physics, Nucleon, Wave function, Nuclear Experiment, Beam (structure)
Abstract

Seidlitz, M., et all ; 10 pags. ; 9 figs. ; 1 tab. ; PACS number(s): 21.60.Cs, 23.20.Js, 25.70.De, 29.38.Gj, Nuclear shell evolution in neutron-rich Na nuclei around N=20 was studied by determining reduced transition probabilities, i.e., B(E2) and B(M1) values, in order to map the border of the island of inversion. To this end Coulomb-excitation experiments, employing radioactive 29,30Na beams with a final beam energy of 2.85 MeV/nucleon, were performed at REX-ISOLDE, CERN. De-excitation γ rays were detected by the MINIBALL γ-ray spectrometer in coincidence with scattered particles in a segmented Si detector. Transition probabilities to excited states were deduced. The measured B(E2) values agree well with shell-model predictions, supporting the idea that in the Na isotopic chain the ground-state wave function contains significant intruder admixture already at N=18, with N=19 having an almost pure two-particle-two-hole deformed ground-state configuration. © 2014 American Physical Society., This work has been supported by the German BMBF under Contracts No. 06K-167, No. 06KY205I, No. 06DA9036I, No. 06MT9156, No. 05P09PKCI5, No. 05P12PKFNE, No. 05P12RDCIA, and No. 05P12RDCIB, by the FWOVlaanderen (Belgium), by the IAP Belgian Science Policy (BriX network (P7/12)), by the UK Science and Technology Funding Council, by the EUROpean Nuclear Structure Integrated Infrastructure Initiative (EURONS, RII3-CT-2004- 506065), and by the European Nuclear Science and Applications Research (ENSAR) under Project No. 262010.

Published
2014

165. Magnetic moment measurement in Zn-72 using the Transient Field technique and Coulomb excitation in inverse kinematics

Author

A. Jungclaus, D. Seiler, José Antonio Briz, J. Leske, C. Bauer, Ángel Perea, R. Orlandi, A. Illana Sisón, D. Mücher, Janne Pakarinen, C. Stahl, Mustafa Rajabali, Norbert Pietralla, Roman Gernhäuser, and Ministerio de Ciencia e Innovación (España)

Subjects
Physics, Magnetic moment, Inverse kinematics, Landé g-factor, Excited state, QC1-999, Isotopes of zinc, Coulomb excitation, Atomic physics, Excitation, Dimensionless quantity
Abstract

4 págs.; 2 figs.; Open Access funded by Creative Commons Atribution Licence 2.0, The g factor of the first excited 2+state of 72Zn has been measured using the Low Velocity Transient Field (LVTF) technique in combination with Coulomb excitation in inverse kinematics. The aim of the experiment was to test the viability of this method when applied to short-lived radioactive ISOL beams, in particular in comparison to the alternative High Velocity Transient Field (HVTF) technique using fragment beams. The result obtained for g(2+) in 72Zn in the present experiment follows the trend observed for the lighter stables Zn isotopes. C Owned by the authors, published by EDP Sciences, 2014, This work has been supported by the Spanish Ministerio de Ciencia e Innovación under contracts FPA2009-13377-C02 and FPA2011-29854-C04.

Published
2014

166. Production and investigation of neutron-rich Osmium isotopes with and around N=126 using gas flow transport method

Author

Mikael Sandzelius, S. V. Khlebnikov, M Sin, E. Vardaci, Francis Hanappe, E. M. Kozulin, Panu Ruotsalainen, Juha Sorri, Janne Pakarinen, Wladyslaw Henryk Trzaska, Paul Greenlees, J. Maurer, S. N. Dmitriev, Valery Zagrebaev, A Flueras, A. Di Nitto, I. M. Harca, K. V. Novikov, T. Loktev, Giorgio Giardina, Avazbek K Nasirov and Giuseppe Mandaglio, Novikov, K, Kozulin, E. M, Harca, I. M, Dmitriev, S, Flueras, A, Greenlees, P, Hanappe, F, Khlebnikov, S. V, Loktev, T, Maurer, J, Nitto, A. Di, Pakarinen, J, Ruotsalainen, P, Sandzelius, M, Sorri, J, Sin, M, Trzaska, W. H, Vardaci, Emanuele, Zagrebaev, V. I., and DI NITTO, Antonio

Subjects
History, Isotope, Chemistry, Physique, Radiochemistry, Nuclear Theory, chemistry.chemical_element, Coulomb barrier, gas flow transport method, Astronomie, Computer Science Applications, Education, Osmium isotopes, Osmium, Neutron, Nuclear Experiment, Volatility (chemistry)
Abstract

Neutron-rich isotopes of heavy nuclei are until now poorly studied. In this work we investigate neutron-rich osmium isotopes produced in multi-nucleon transfer reactions. The reaction 136Xe+208Pb at energy near Coulomb barrier is used for production of osmium isotopes. The CORSAR-V setup is used to record the characteristics of osmium isotopes. The separation of the reaction products is based on their respective volatility. Experimental results are presented and discussed. © Published under licence by IOP Publishing Ltd., SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2014

168. The first results with the new JYFL 14 GHz ECR ion source

Author

A Lassila, E. Liukkonen, H Leinonen, Väinö Hänninen, P. Heikkinen, Janne Pakarinen, V. Nieminen, K. Ranttila, H. Koivisto, and J. Ärje

Subjects
Nuclear and High Energy Physics, Ion beam deposition, Ion beam, chemistry, Highly charged ion, chemistry.chemical_element, Atomic physics, Boron, Instrumentation, Beam (structure), Ion source, Ion, Voltage
Abstract

A new 14 GHz ECR ion source has been built for the Accelerator Laboratory in the Department of Physics (JYFL), University of Jyvaskyla. This source belongs to the family of the LBNL AECR-U-based ECR ion sources. The operation during the first four months has shown that the new ion source performs well and is able to produce intensive highly charged ion beams. For example, 145 μA of O7+ ion beam was recorded. The production of iron and boron ion beams was tested using the MIVOC method. The 56Fe11+ ion beam current reached a value of 115 μA. The intensities of 11B3+ and 11B5+ ion beams were 235 and 52 μA, respectively. This iron beam intensity is the second highest and the boron beam intensities are the highest ever produced by an ECR ion source. In all the tests an extraction voltage of 10 kV was applied.

Published
2001

169. Combined in-beam gamma-ray and conversion electron spectroscopy with radioactive ion beams. Simulations of a silicon detector for the SPEDE spectrometer

Author

R. Julin, P. Rahkila, K. Ranttila, G. G. O'Neill, Marc Huyse, D. G. Jenkins, P. J. Davies, P. Van Duppen, J. Thornhill, R. D. Page, Janne Pakarinen, R.-D. Herzberg, Paul Greenlees, P. A. Butler, Joonas Konki, Philippos Papadakis, Simenel, C, Evers, M, Kibedi, T, Luong, DH, Reed, M, Srncik, M, and Wallner, A

Subjects
Physics, Ion beam, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Gamma ray, Electron, 01 natural sciences, 7. Clean energy, Electron spectroscopy, Engineering physics, Semiconductor detector, Internal conversion, Optics, 0103 physical sciences, Physics::Accelerator Physics, Nuclear Experiment, 010306 general physics, business, Beam (structure)
Abstract

In-beam gamma-ray and electron spectroscopy have been widely used as tools to study the broad variety of phenomena in nuclear structure. The SPEDE spectrometer is a new device to be used in conjunction with the MINIBALL germanium detector array to enable the detection of internal conversion electrons in coincidence with gamma rays from de-exciting nuclei in radioactive ion beam experiments at the upcoming HIE-ISOLDE facility at CERN, Switzerland. Geant4 simulations were carried out in order to optimise the design and segmentation of the silicon detector to achieve good energy resolution and performance. ispartof: pages:1-4 ispartof: EPJ Web ofConferences vol:63 pages:1-4 ispartof: Heavy Ion Accelerator Symposium location:AUSTRALIA, Canberra date:8 Apr - 12 Apr 2013 status: published

Published
2013

170. Inert Gas Measurement of Single Bubble in CeO2

Author

Xian-Ming Bai, Todd R. Allen, Yongqiang Wang, Lingfeng He, Jian Gan, Janne Pakarinen, and Anter El-Azab

Subjects
Materials science, Chemical engineering, Bubble, Buffer gas, Inert gas, Instrumentation
Published
2015

171. In-beam gamma-ray spectroscopy of 254No

Author

A. Chatillon, G. D. Jones, P. Reiter, T. L. Khoo, W. Korten, Paivi Nieminen, F. P. Hessberger, J. Perkowski, A.-P. Leppänen, J. E. Bastin, H. J. Wollersheim, C. Scholey, Y. Le Coz, N. Amzal, R. Julin, Ch. Theisen, Juha Uusitalo, T. Grahn, J. Gerl, S. Juutinen, Andreas Görgen, E. Bouchez, K. Van de Vel, S. Eeckhaudt, Janne Pakarinen, P. Kuusiniemi, K. Eskola, R.-D. Herzberg, Paul Greenlees, A. Pritchard, P. Rahkila, A. Hürstel, Peter M. Jones, P. J. C. Ikin, Matti Leino, Heikki Kettunen, Jonathan Wilson, and P. A. Butler

Subjects
Physics, Nuclear and High Energy Physics, chemistry, Hadron, Detector, Nuclear fusion, chemistry.chemical_element, Gamma spectroscopy, Germanium, Atomic physics, Nuclear Experiment, Recoil separator, Beam (structure)
Abstract

The recoil-tagging technique has been employed to perform an in-beam gamma-ray spectroscopic study of the transfermium nucleus 254No. The experiment was carried out at the Department of Physics of the University of Jyvaskyla and utilised the JUROGAM array of germanium detectors coupled to the gasfilled recoil separator RITU. The ground-state rotational band was extended and evidence for non-yrast states was observed for the first time.

Published
2005

172. Competing single-particle and collective states in the low-energy structure of113I

Author

Jari Partanen, Janne Pakarinen, Bo Cederwall, Torbjörn Bäck, W.Y. Liang, Michael Taylor, Panu Rahkila, Sakari Juutinen, Andrej Herzan, Juha Sorri, Maria Doncel, D. M. Cullen, Panu Ruotsalainen, Matti Leino, Thomas Braunroth, Sanna Stolze, A. Dewald, Pauli Peura, Joonas Konki, Jan Sarén, Ulrika Jakobsson, Tuomas Grahn, Mikael Sandzelius, Rauno Julin, Roberto Liotta, Juha Uusitalo, Paul Greenlees, Kalle Auranen, Furong Xu, and M. G. Procter

Subjects
Physics, Nuclear and High Energy Physics, Low energy, ta114, Routhian, SHELL model, Quadrupole, Atomic physics
Abstract

To understand the low-energy structure of the neutron deficient iodine isotopes, lifetimes for the low-lying $9/{2}^{+}$ and $11/{2}^{+}$ positive-parity states in ${}^{113}$I have been measured as $\ensuremath{\tau}=28(4)$ ps and $\ensuremath{\tau}=3.7(7)$ ps, respectively. The lifetime for the $11/{2}^{\ensuremath{-}}$ state, which feeds the $9/{2}^{+}$ and $11/{2}^{+}$ states, was remeasured with improved accuracy as $\ensuremath{\tau}=216(7)$ ps. The reduced transition probability, $B(E2)=32(5)$ W.u., for the $9/{2}^{+}\ensuremath{\rightarrow}5/{2}^{+}$ transition agrees with that calculated within the shell model using a Hamiltonian based on the charge-dependent Bonn nucleon-nucleon interaction. In contrast, the much larger transition probability, $B(E2)=209(39)$ W.u., measured for the $11/{2}^{+}\ensuremath{\rightarrow}7/{2}^{+}$ transition has been interpreted, with the aid of configuration-constrained total Routhian surface calculations, as resulting from a slightly $\ensuremath{\gamma}$-soft rotor with an associated quadrupole deformation of ${\ensuremath{\beta}}_{2}\ensuremath{\approx}0.18$. Remarkably similar reduced $E1$ transition probabilities of $5.5(5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $4.9(5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ W.u. were deduced for the $11/{2}^{\ensuremath{-}}\ensuremath{\rightarrow}9/{2}^{+}$ and $11/{2}^{\ensuremath{-}}\ensuremath{\rightarrow}11/{2}^{+}$ transitions, respectively, which feed apparently dissimilar but competing structures.

Published
2013

173. Transmission Efficiency of the SAGE Spectrometer Using GEANT4

Author

F. A. Ali, P. A. Butler, V. F. E. Pucknell, Jayne Simpson, D. Seddon, A. K. Mistry, J.R. Cresswell, Panu Rahkila, J. Thornhill, Rauno Julin, P. J. Coleman-Smith, J. Sorri, D. Wells, M. Sandzelius, Philippos Papadakis, S. C. Letts, Paul Greenlees, Daniel Cox, J. Konki, I.H. Lazarus, J.A. Sampson, Janne Pakarinen, and Rolf-Dietmar Herzberg

Subjects
Materials science, Spectrometer, Silicon, ta114, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, SAGE, Detector, chemistry.chemical_element, Germanium, Electron, 01 natural sciences, 3. Good health, Electron transmission, chemistry, Transmission (telecommunications), 0103 physical sciences, Optoelectronics, Computer Science::Symbolic Computation, Nuclear Experiment, 010306 general physics, business
Abstract

The new SAGE spectrometer allows simultaneous electron and γ-ray in-beam studies of heavy nuclei. A comprehensive GEANT4 simulation suite has been created for the SAGE spectrometer. This includes both the silicon detectors for electron detection and the germanium detectors for γ-ray detection. The simulation can be used for a wide variety of tests with the aim of better understanding the behaviour of SAGE. A number of aspects of electron transmission are presented here.

Published
2013
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174. Experimental study of bound states in12Be through low-energy11Be(d,p)-transfer reactions

Author

T. Kröll, Joonas Konki, V. Pesudo, Thomas Nilsson, K. Riisager, M. Cubero, J. G. Johansen, Jan Diriken, H. Törnqvist, J. Elseviers, Kathrin Wimmer, D. Voulot, Liam Gaffney, N. Warr, Janne Pakarinen, Björn Jonson, H. O. U. Fynbo, M. Seidlitz, Olof Tengblad, K. Nowak, D. Mücher, H. De Witte, R. Raabe, R. Krücken, Fredrik Wenander, María José García Borge, G. T. Koldste, Roman Gernhäuser, V. Bildstein, and L. M. Fraile

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, 010308 nuclear & particles physics, Gamma ray, chemistry.chemical_element, Germanium, 01 natural sciences, 7. Clean energy, chemistry, Transfer (computing), Excited state, 0103 physical sciences, Bound state, Physics::Accelerator Physics, Atomic physics, Born approximation, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

The bound states of Be-12 have been studied through a Be-11(d, p) Be-12 transfer reaction experiment in inverse kinematics. A 2.8 MeV/u beam of Be-11 was produced using the REX-ISOLDE facility at CERN. The outgoing protons were detected with the T-REX silicon detector array. The MINIBALL germanium array was used to detect gamma rays from the excited states in Be-12. The gamma-ray detection enabled a clear identification of the four known bound states in Be-12, and each of the states has been studied individually. Differential cross sections over a large angular range have been extracted. Spectroscopic factors for each of the states have been determined from distorted wave Born approximation (DWBA) calculations and have been compared to previous experimental and theoretical results.

Published
2013

175. Local suppression of collectivity in theN=80isotones at theZ=58subshell closure

Author

Thierry Stora, T. Möller, T. Kröll, M. Danchev, M. Vermeulen, D. Tarpanov, N. Lo Iudice, N. Warr, T. Bloch, D. Voulot, H. De Witte, D. Bianco, Ch. Stoyanov, P. Reiter, C. Stahl, B. Siebeck, Janne Pakarinen, Marcus Scheck, R. Stegmann, J. Leske, A. Blazhev, Fredrik Wenander, Norbert Pietralla, G. Rainovski, V. Werner, S. Bönig, K. Moschner, K. A. Gladnishki, A. Damyanova, C. Bauer, and M. Seidlitz

Subjects
Nuclear physics, Mass number, Physics, Nuclear and High Energy Physics, Pairing, Nuclear Theory, Physics::Atomic and Molecular Clusters, Closure (topology), Nucleon, Valence electron
Abstract

) transition strengths [1] and thenumber of nucleons in the valence shell. The global behaviorof these quantities between the major shells as a function ofthe nucleon number is well understood in the frameworks ofboth collective and microscopic models. One could expect thatthese general trends in the collective properties between themajorshellsaremodulated bythesubshellstructure.However,it is usually thought that the pairing correlations with anenergy scale of about 2 MeV, smear out and dissolve thesubshell structure as long as the separation energies betweenthe subshells are only about a few hundred keV.The recently observed evolution of the isovectorquadrupole-collective valence-shell excitations in the

Published
2013

176. EVOLUTION OF NUCLEAR STRUCTURE IN NEUTRON-DEFICIENT Pb ISOTOPES

Author

Peter B. Jones, Paivi Nieminen, T. Grahn, P. M. Raddon, Rauno Julin, K. Van de Vel, R. Wadsworth, S. Juutinen, D. G. Jenkins, J. Perkowski, C. Scholey, Robert Page, Matti Leino, Janne Pakarinen, Heikki Kettunen, Pankaj S. Joshi, A. P. Leppënen, A. N. Andreyev, D. R. Wiseman, Paul Greenlees, P. Rahkila, S. Eeckhaudt, and Juha Uusitalo

Subjects
Physics, ta114, Isotope, Radiochemistry, Nuclear structure, Neutron
Published
2013

177. INVESTIGATION OF NEUTRON-RICH OSMIUM ISOTOPES IN THE REACTION 136Xe+208Pb AT THE ENERGIES CLOSE TO COULOMB BARRIER

Author

G. N. Knyazheva, Paul Greenlees, K. V. Novikov, M. Sandzelius, S. V. Khlebnikov, T. Loktev, F. Hannape, Janne Pakarinen, W. H. Trzaska, Emanuele Vardaci, I. M. Itkis, Panu Ruotsalainen, S. N. Dmitriev, Valery Zagrebaev, Juha Sorri, A. Di Nitto, J. Maurer, and E. M. Kozulin

Subjects
Nuclear physics, ta114, Isotope, Chemistry, chemistry.chemical_element, Coulomb barrier, Osmium, Neutron, Atomic physics
Published
2013

178. α-decay studies of the francium isotopes198Fr and199Fr

Author

Rauno Julin, Sarah Eeckhaudt, Juha Sorri, Andrew Steer, M. Venhart, Peter M. Jones, Ulrika Jakobsson, A.-P. Leppänen, Matti Leino, Sakari Juutinen, Tuomas Grahn, Janne Pakarinen, Steffen Ketelhut, Juha Uusitalo, A. Semchenkov, Markus Nyman, Panu Rahkila, Paul Greenlees, Catherine Scholey, and Jan Sarén

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Isotope, chemistry, chemistry.chemical_element, Silicon detector, Neutron, Alpha decay, Energy (signal processing), Recoil separator, Ion, Francium
Abstract

Very neutron deficient francium isotopes have been produced in fusion evaporation reactions using ${}^{60}$Ni ions on ${}^{141}$Pr targets. The gas-filled recoil separator RITU was employed to collect the fusion products and to separate them from the scattered beam. The activities were implanted into a position sensitive silicon detector after passing through a gas-counter system. The isotopes were identified using spatial and time correlations between the implants and the decays. Two $\ensuremath{\alpha}$-particle activities, with ${E}_{\ensuremath{\alpha}}=7613(15)$ keV and ${T}_{1/2}$ $=$ (${15}_{\ensuremath{-}5}^{+12}$) ms and ${E}_{\ensuremath{\alpha}}=7684(15)$ keV and ${T}_{1/2}$ $=$ (${16}_{\ensuremath{-}5}^{+13}$) ms were identified in the new isotope ${}^{198}$Fr. In addition, the half-life and $\ensuremath{\alpha}$-particle energy of ${}^{199}$Fr were measured with improved precision. The measured decay properties deduced for ${}^{199}$Fr and ${}^{198}$Fr suggest that there is an onset of ground-state deformation at $N=112$ in the Fr isotopes.

Published
2013

179. Low-lying excited states in the neutron-deficient isotopes163Os and165Os

Author

C. Scholey, M. B. Gomez-Hornillos, P. J. Sapple, Juha Uusitalo, J. Simpson, P. Rahkila, R. D. Page, D. T. Joss, Paul Greenlees, B. Saygi, M. Nyman, S. Eeckhaudt, Baharak Hadinia, Michael Drummond, A.-P. Leppänen, Iain Darby, M. Sandzelius, S. Juutinen, David O'Donnell, R. Julin, K. Andgren, T. Grahn, Steffen Ketelhut, J. Thomson, Juha Sorri, Peter M. Jones, L. Bianco, Jan Sarén, M. Venhart, Matti Leino, Janne Pakarinen, and Bo Cederwall

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Spectrometer, Isotope, Atomic orbital, Excited state, Yrast, Nuclear Theory, Neutron, Atomic physics, Nuclear Experiment, Coincidence
Abstract

Excited states in the neutron-deficient isotopes Os-163 and Os-165 were identified using the JUROGAM and GREAT spectrometers in conjunction with the RITU gas-filled separator. The Os-163 and Os-165 nuclei were populated via the Cd-106(Ni-60,3n) and Mo-92(Kr-78,2p3n) reactions at bombarding energies of 270 MeV and 357 MeV, respectively. Gamma-ray emissions from these nuclei have been established unambiguously using the recoil-decay tagging technique and a coincidence analysis has allowed level schemes to be established. These results suggest that the yrast states are based upon negative-parity configurations originating from the f(7/2) and h(9/2) orbitals.

Published
2013

180. The Miniball spectrometer

Author

V. N. Fedosseev, F. Ames, S. Franchoo, B. Bastin, D. Weißhaar, K. Wrzosek-Lipska, Georgi P. Georgiev, N. Patronis, Gheorghe Pascovici, J. Gerl, Joakim Cederkäll, S. Bönig, Riccardo Raabe, M. Lauer, Th. Kröll, M. Seidlitz, R. Krücken, Fredrik Wenander, N. Warr, Douglas D. DiJulio, V. Bildstein, Achim Richter, J. Elseviers, G. Walter, M. Münch, Heiko Scheit, H. Hess, U. Köster, Herbert A. Simon, S. Emhofer, J. Van de Walle, D. Mücher, T. Sieber, Andreas Ekström, P. G. Thirolf, Marcus Scheck, R. Wadsworth, I. Stefanescu, M. Pantea, P. Van Duppen, H.G. Thomas, J. Iwanicki, O. Schaile, K.-H. Speidel, D. G. Jenkins, P. Delahaye, Jan Diriken, D. Habs, P. A. Butler, A. Blazhev, B. Bruyneel, M. D. Seliverstov, Oliver Kester, Norbert Pietralla, A. Petts, Andreas Wiens, Kathrin Wimmer, G. Schrieder, Janne Pakarinen, C. Fransen, C. Stahl, N. Bree, Thomas Davinson, T. Grahn, Thomas Elias Cocolios, B. A. Marsh, R. Lutter, O. Ivanov, D. Pauwels, M. Thürauf, D. Schwalm, D. Voulot, M. Krauth, O. Niedermaier, E. Rapisarda, H. De Witte, K. O. Zell, K. P. Lieb, Liam Gaffney, E. Clément, A. M. Hurst, D. V. Fedorov, J. Eberth, C. Bauer, P. Reiter, L. Maier, Mark Huyse, B. H. Wolf, R. Gernhäuser, J. Leske, Philip Woods, N. Kesteloot, M. Albers, J. Jolie, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), MINIBALL, KVI - Center for Advanced Radiation Technology, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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)-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)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and 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)

Subjects
Radioactive ion beams, Nuclear and High Energy Physics, Ion beam, REX-ISOLDE, ONLINE, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, SETUP, COULOMB-EXCITATION, 0103 physical sciences, Nuclear fusion, SILICON STRIP DETECTOR, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], RELATIVISTIC ENERGIES, 010306 general physics, Nuclear Experiment, NEUTRON KNOCKOUT, Physics, Nuclear Physics, Heavy Ions, Hadrons, Particle and Nuclear Physics, Nuclear Fusion, Large Hadron Collider, Spectrometer, NUCLEI, 010308 nuclear & particles physics, Detector, RADIOACTIVE ION-BEAM, Semiconductor detector, Physics::Accelerator Physics, GE DETECTORS
Abstract

The Miniball germanium detector array has been operational at the REX (Radioactive ion beam EXperiment) post accelerator at the Isotope Separator On-Line facility ISOLDE at CERN since 2001. During the last decade, a series of successful Coulomb excitation and transfer reaction studies have been performed with this array, utilizing the unique and high-quality radioactive ion beams which are available at ISOLDE. In this article, an overview is given of the technical details of the full Miniball setup, including a description of the γ-ray and particle detectors, beam monitoring devices and methods to deal with beam contamination. The specific timing properties of the REX-ISOLDE facility are highlighted to indicate the sensitivity that can be achieved with the full Miniball setup. The article is finalized with a summary of some physics highlights at REX-ISOLDE and the utilization of the Miniball germanium detectors at other facilities. © The Author(s) 2013. ispartof: European Physical Journal A, Hadrons and Nuclei vol:49 issue:3 pages:1-32 status: published

Published
2013

181. Shape dynamics in neutron-rich Kr isotopes: Coulomb excitation of 92Kr, 94Kr and 96Kr

Author

Jan Diriken, R. Krücken, Fredrik Wenander, D. Cline, T. Kröll, B. S. Nara Singh, C. Bauer, M. Zielińska, D. Radeck, K. Moschner, M. Seidlitz, C. Fransen, L. Bettermann, Stefan Heinze, T. Davinson, Mark Huyse, A. Blazhev, G. S. Simpson, R. Wadsworth, H. De Witte, M. Pfeiffer, Herbert Hess, P. Reiter, N. Warr, Iain Darby, Kathrin Wimmer, R. Gernhäuser, M. Rudigier, M. Vermeulen, B. Bastin, Kosuke Nomura, D. M. Filipescu, J. Van de Walle, M. Cappellazzo, Georgi P. Georgiev, R. R. Rodríguez-Guzmán, Joakim Cederkäll, D. G. Jenkins, D. Mücher, K. Nowak, M. Hackstein, R. Lutter, T. Thomas, C. Mihai, K. O. Zell, P. Thöle, P. J. Napiorkowski, J. Litzinger, P. Van Duppen, Vinzenz Bildstein, M. Kowalczyk, S. Das Gupta, D. Voulot, Jonathan Butterworth, J. M. Daugas, Liam Gaffney, M. Albers, J. Jolie, L. M. Robledo, Joonas Konki, B. Siebeck, E. Fiori, Susan Rigby, N. Marginean, Janne Pakarinen, Marcus Scheck, C. Bernards, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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)-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)-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 Subatomique et de Cosmologie (LPSC), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Large Hadron Collider, ta114, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Projectile, Coulomb excitation, 01 natural sciences, 7. Clean energy, Nuclear physics, Matrix (mathematics), Excited state, 0103 physical sciences, Physics::Accelerator Physics, Neutron, Interacting boson model, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

We report on the study of excited states in 92,94,96Kr populated via projectile Coulomb excitation at safe energies. The radioactive ion beams at energies of 2.85 MeV/u were delivered by the REX-ISOLDE facility at CERN and impinged on self-supporting 194,196Pt targets. The emitted γ -rays were detected by the Miniball detector-array. A detailed description of the experimental techniques used for extracting diagonal and transitional matrix elements and of the theoretical framework is given. The present experiment reveals the moderate evolution of the collective structure in the considered neutron-rich Kr isotopic chain, which is supported by the interacting boson model combined with the self-consistent mean-field method using a microscopic Gogny energy-density functional. The theory also suggests possible shape coexistence in the exotic nucleus 96Kr. ispartof: Nuclear Physics A vol:899 pages:1-28 status: published

Published
2013

182. Coulomb excitation of re-accelerated 208Rn and 206Po beams

Author

Kalle Auranen, T. Steinbach, V. Werner, A. Blazhev, F. Wenander, Liam Gaffney, M. Venhart, T. Grahn, C. Bernards, D. Radeck, C. Bauer, J. Elseviers, S. Sambi, Martin Veselsky, L. Lewandowski, K. Wrzosek-Lipska, Joonas Konki, Pauli Peura, S. Bönig, M. Zielińska, Sanna Stolze, Marcus Scheck, P. Reiter, Janne Pakarinen, A. Herzáň, Ulrika Jakobsson, M. Rudiger, K. Reynders, M. Seidlitz, A. Vogt, M. J. Vermeulen, M. D. Salsac, N. Kesteloot, P. Van Duppen, P. A. Butler, Marc Huyse, P. Thoele, N. Warr, B. Siebeck, K. Mosher, M. Albers, M. Thürauf, Th. Kröll, E. Rapisarda, H. De Witte, Panu Rahkila, M. Pfeiffer, T. De Coster, A. Damyanova, Simenel, C, Evers, M, Kibedi, T, Luong, DH, Reed, M, Srncik, M, Wallner, A, and Helsinki Institute of Physics

Subjects
Physics, Angular momentum, ta114, Isotope, 010308 nuclear & particles physics, QC1-999, Shell (structure), Boundary (topology), Coulomb excitation, 114 Physical sciences, 01 natural sciences, Experimental Nuclear Physics, Physics and Astronomy, STATES, 0103 physical sciences, Quasiparticle, Applied mathematics, Physics::Accelerator Physics, Atomic physics, 010306 general physics, Spin (physics), Nuclear Experiment, Excitation
Abstract

In the present study, B( E2; 2(+)-> 0(+) ) values have been measured in the Rn-208 and Po-206 nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERN-ISOLDE. The resulting B(E2; 2(+)-> 0(+)) in 208Rn is similar to 0.08 e(2)b(2). These nuclei lie in, or at the boundary of the region where seniority scheme should persist. However, contributions from collective excitations may be present when moving away from the N = 126 shell closure. To date, surprisingly little is known of the transition probabilities between the low-spin states in this region.

Published
2013

183. Investigations on core basket bolts from a VVER 440 power plant

Author

Heikki Keinänen, Ulla Ehrnstén, Wade Karlsen, and Janne Pakarinen

Subjects
Washer, Materials science, business.industry, irradiated assisted stress corrosion cracking, FEG TEM analyses, General Engineering, Welding, Structural engineering, Intergranular corrosion, failure analysis, law.invention, Stress (mechanics), Cracking, law, Head (vessel), General Materials Science, FEM modelling, Stress corrosion cracking, business, stainless steel, Spot welding
Abstract

Non-destructive examinations using ultrasonic inspections were performed on core basket bolts at a VVER 440 unit. The four M12 bolts, manufactured from solution annealed Ti-stabilized stainless steel, had been replaced due to NDE indications. Destructive investigations were performed on three of these bolts. One bolt had suffered from intergranular stress corrosion cracking, enhanced by irradiation. Irradiation induced grain boundary segregation was observed in the material. The washer of the bolt with cracking had been unintentionally spot welded to the shielding plate, restricting the free movement of the components to adapt to the differences in thermal expansion during e.g. start-up. The stress situation is modeled using finite element computation, and the location and magnitude of high stresses due to spot welding is clearly shown. The reason for the NDE indications in the other bolts were incomplete filling of the flat slot of the bolt head when the bolt was welded to the washer to prevent unscrewing of the bolt during operation.

Published
2013

184. Onset of collectivity in neutron-rich Sr and Kr isotopes: Prompt spectroscopy after Coulomb excitation at REX-ISOLDE, CERN

Author

Therese Renstrøm, P. J. Napiorkowski, M. Zielinska, P. Delahaye, J. Ljungvall, B. Bruyneel, W. Korten, Sunniva Siem, R. Lutter, C. Fransen, Emyr Clement, Andreas Görgen, Janne Pakarinen, B. Siebeck, D. G. Jenkins, B. Bastin, Andreas Ekström, I. Stefanescu, J. Srebrny, C. Bauer, J. Iwanicki, P. Reiter, N. Hasan, Conor Fitzpatrick, R. Gernhäuser, C. Sotty, M. J. Vermeulen, G. Georgiev, Andreas Wiens, Jonathan Butterworth, M. Seidlitz, N. Bree, P. A. Butler, K. Moschner, Herbert Hess, A. C. Larsen, P. Marley, K. Wrzosek-Lipska, A. Blazhev, A. Dijon, J. Van de Walle, H. De Witte, N. Warr, Gry Merete Tveten, A. Petts, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, Chatillon, A, Farget, F, Faust, H, Fioni, G, Goutte, D, Goutte, H, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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)-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)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and 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)

Subjects
Physics, Large Hadron Collider, Shape change, Isotope, 010308 nuclear & particles physics, QC1-999, Nuclear Theory, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Neutron number, 0103 physical sciences, Quadrupole, Physics::Accelerator Physics, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Nuclear Experiment, ComputingMilieux_MISCELLANEOUS
Abstract

A rapid onset of quadrupole deformation is known to occur around the neutron number 60 in the neutron-rich Zr and Sr isotopes. This shape change has made the neutron-rich A = 100 region an active area of experimental and theoretical studies for many decades now. We report in this contribution new experimental results in the neutron rich 96,98Sr investigated by safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility, CERN. Reduced transition probabilities and spectroscopic quadrupole moments have been extracted from the differential Coulomb excitation cross section supporting the scenario of shape coexistence/change at N = 60. Future perspectives are presented including the recent experimental campaign performed at ILL-Grenoble. ispartof: EPJ Web of Conferences vol:62 ispartof: 5th International Workshop on Nuclear Fission and Fission Product Spectroscopy (FISSION) location:Caen: FRANCE date:28 May - 31 May 2013 status: published

Published
2013

185. Studies of pear-shaped nuclei using accelerated radioactive beams

Author

Mark Huyse, Jan Diriken, D. Radeck, P. J. Napiorkowski, D. T. Joss, S. Bönig, A. B. Hayes, L. M. Robledo, Joonas Konki, C. Y. Wu, D. G. Jenkins, K. Reynders, A. Herzan, M. J. Vermeulen, N. Kesteloot, Fredrik Wenander, N. Bree, P. A. Butler, K. Moschner, Timothy Chupp, Janne Pakarinen, P. Reiter, M. Seidlitz, K. Wrzosek-Lipska, M. Albers, S. Sambi, Kathrin Wimmer, D. Voulot, M. von Schmid, A. Blazhev, D. Cline, Liam Gaffney, C. Bauer, E. Kwan, M. Pfeiffer, M. Kowalczyk, Th. Kröll, P. Thoele, M. Rudigier, Joakim Cederkäll, B. Siebeck, Thomas Davinson, T. Grahn, Thierry Stora, Thomas Elias Cocolios, Marcus Scheck, R. Lutter, Susan Rigby, P. Van Duppen, M. Zielinska, N. Warr, B. Bastin, H. De Witte, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Multidisciplinary, Isotope, ta114, 010308 nuclear & particles physics, Nuclear Theory, Nuclear structure, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Atomic nucleus, Quadrupole, Physics::Accelerator Physics, Neutron, Nuclide, Physics::Atomic Physics, Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

There is strong circumstantial evidence that certain heavy, unstable atomic nuclei are ‘octupole deformed’, that is, distorted into a pear shape. This contrasts with the more prevalent rugby-ball shape of nuclei with reflection-symmetric, quadrupole deformations. The elusive octupole deformed nuclei are of importance for nuclear structure theory, and also in searches for physics beyond the standard model; any measurable electric-dipole moment (a signature of the latter) is expected to be amplified in such nuclei. Here we determine electric octupole transition strengths (a direct measure of octupole correlations) for short-lived isotopes of radon and radium. Coulomb excitation experiments were performed using accelerated beams of heavy, radioactive ions. Our data on 220Rn and 224Ra show clear evidence for stronger octupole deformation in the latter. The results enable discrimination between differing theoretical approaches to octupole correlations, and help to constrain suitable candidates for experimental studies of atomic electric-dipole moments that might reveal extensions to the standard model. An experimental study of certain short-lived isotopes of radon and radium has found clear octupole deformation in the nuclei of the latter — that is, these nuclei are pear-shaped; the results enable discrimination between differing theoretical approaches to octupole correlations. The atomic nucleus is a many-body quantum system with a shape determined by the number of nucleons that it contains and the interactions between them. Most of the several thousand known stable and radioactive atomic nuclei, with differing numbers of protons and neutrons, are spherical or rugby-ball shaped. But there is circumstantial evidence that some heavy, unstable nuclides are distorted into a pear shape through the phenomenon of octupole deformation. Samples of these rare atomic species can be accelerated to 8% of the speed of light in the REX-ISOLDE facility at CERN, and now Coulomb excitation experiments on beams of the short-lived isotopes radium-224 and radon-220 have demonstrated clear octupole deformation in the former. The results make it possible to discriminate between the various theoretical models of octupole-deformed nuclei, and are also relevant to the pursuit of physics beyond the Standard Model.

Published
2013

186. In-beam spectroscopic studies of shape coexistence and collectivity in the neutron-deficientZ≈ 82 nuclei

Author

Panu Rahkila, Janne Pakarinen, Tuomas Grahn, and Rauno Julin

Subjects
Physics, Nuclear and High Energy Physics, quadrupole moment, recoil distance Doppler-shift method, 010308 nuclear & particles physics, High selectivity, deformation, shape coexistence, Key features, 01 natural sciences, Spectral line, Nuclear physics, JUROGAM, ydinreaktiot, Excited state, 0103 physical sciences, Neutron, in-beam γ-ray spectroscopy, Atomic physics, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

In the present paper we focus on studies of shape coexistence in even-mass nuclei in the neutron-deficient Pb region. They are based on experiments carried out using tagging techniques in the Accelerator Laboratory of the University of Jyväskylä, Finland. Excited states in many of these nuclei can only be accessed via fusion-evaporation reactions employing high-intensity stable-ion beams. The key features in these experiments are high selectivity, clean spectra and instrumentation that enables high count rates. We review three spectroscopic highlights in this region. peerReviewed

Published
2016

187. Erratum: Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes [Phys. Rev. Lett.108, 062701 (2012)]

Author

Stefan Heinze, Herbert Hess, J. M. Daugas, P. Reiter, J. Litzinger, G. Georgiev, L. M. Robledo, C. Fransen, Joonas Konki, Kathrin Wimmer, Mark Huyse, M. Cappellazzo, G. S. Simpson, T. Davinson, T. Thomas, Kentaro Nomura, M. Pfeiffer, T. Kröll, M. Rudigier, D. Voulot, D. Cline, K. Nowak, Liam Gaffney, J. Van de Walle, A. Blazhev, R. Lutter, P. J. Napiorkowski, C. Bauer, Roman Gernhäuser, K. O. Zell, B. Bastin, Marcus Scheck, B. Siebeck, E. Fiori, Iain Darby, D. G. Jenkins, D. Radeck, L. Bettermann, M. Albers, K. Moschner, J. Jolie, Jonathan Butterworth, M. Kowalczyk, M. Vermeulen, R. Krücken, Fredrik Wenander, Susan Rigby, S. Das Gupta, Joakim Cederkäll, M. Hackstein, H. De Witte, N. Marginean, Janne Pakarinen, Takaharu Otsuka, R. R. Rodríguez-Guzmán, N. Warr, P. Thöle, M. Seidlitz, R. Wadsworth, M. Zielinska, D. Mücher, Pedro Sarriguren, C. Mihai, P. Van Duppen, C. Bernards, Vinzenz Bildstein, Jan Diriken, B. S. Nara Singh, and D. M. Filipescu

Subjects
Nuclear physics, Physics, Isotope, General Physics and Astronomy, Neutron, Coulomb excitation, Deformation (meteorology)
Published
2012

188. Investigation of high-Kstates in252No

Author

W. Korten, Michel Girod, F. P. Heßberger, Pauli Peura, Ch. Theisen, M. Nyman, Rauno Julin, P. Ruotsalainen, K. Hauschild, Steffen Ketelhut, A. Drouart, Peter B. Jones, D. Rostron, S. Juutinen, C. Scholey, J. Piot, R.-D. Herzberg, O. Dorvaux, B. Sulignano, Dieter Ackermann, S. Antalic, Janne Pakarinen, Jan Sarén, J. P. Delaroche, Juha Uusitalo, Philippos Papadakis, Matti Leino, B. J. P. Gall, E. Parr, P. Rahkila, A. Obertelli, Paul Greenlees, J. Ljungvall, Juha Sorri, M. Venhart, M. Zielińska, A. Lopez-Martens, Ulrika Jakobsson, Andreas Görgen, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-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), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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)-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)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
SUPERHEAVY, Nuclear and High Energy Physics, Nuclear Theory, TOTAL DATA READOUT, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ISOMERS, 01 natural sciences, HEAVY-ELEMENTS, 0103 physical sciences, SUPERDEFORMED BANDS, Nuclear Physics - Experiment, 010306 general physics, High-κ dielectric, Spin-½, Physics, SPECTROSCOPY, ta114, NUCLEI, 010308 nuclear & particles physics, GOGNY FORCE, State (functional analysis), Engineering physics, 190 REGION, Excited state, Homogeneous space, Quasiparticle, Atomic physics, DECAY
Abstract

In this paper we investigate the rotational band built upon a two-quasiparticle ${8}^{\ensuremath{-}}$ isomeric state of ${}^{252}$No up to spin ${I}^{\ensuremath{\pi}}$ $=$ ${22}^{\ensuremath{-}}$. The excited states of the band were populated with the ${}^{206}$Pb(${}^{48}\text{Ca},2n$) fusion-evaporation reaction. An unambiguous assignment of the structure of the ${8}^{\ensuremath{-}}$ isomer as a $7/{2}^{+}{[624]}_{\ensuremath{\nu}}\ensuremath{\bigotimes}9/{2}^{\ensuremath{-}}{[734]}_{\ensuremath{\nu}}$ configuration has been made on the basis of purely experimental data. Comparisons with triaxial self-consistent Hartree-Fock-Bogoliubov calculations using the D1S force and breaking time-reversal as well as $z$-signature symmetries are performed. These predictions are in agreement with present measurements. Mean-field calculations extended to similar states in ${}^{250}$Fm support the interpretation of the same two-neutron quasiparticle structure as the bandhead in both $N=150$ isotones.

Published
2012

189. Electromagnetic transition strengths in52109Te

Author

J. P. Revill, Tuomas Grahn, Juha Uusitalo, T. Pissulla, Peter B. Jones, S. V. Rigby, Bo Cederwall, D. M. Cullen, N. M. Lumley, P. J. R. Mason, Pauli Peura, Juha Sorri, M. Hackstein, P. T. Wady, Michael Taylor, Paul Greenlees, Chong Qi, C. Fransen, Furong Xu, L. Angus, Roberto Liotta, Torbjörn Bäck, Rauno Julin, Panu Ruotsalainen, Mikael Sandzelius, Jan Sarén, Matti Leino, Panu Rahkila, Steffen Ketelhut, W. Rother, Janne Pakarinen, A. Dewald, Ulrika Jakobsson, Markus Nyman, Sakari Juutinen, M. G. Procter, Catherine Scholey, and Paivi Nieminen

Subjects
Physics, Nuclear and High Energy Physics, Valence (chemistry), Recoil, chemistry, Coincident, Nuclear Theory, SHELL model, chemistry.chemical_element, Neutron, Atomic physics, Nuclear Experiment, Tellurium
Abstract

Lifetime measurements have been made in the neutron-deficient nucleus ${}^{109}$Te using the coincident recoil distance Doppler-shift method. The experimental $B(E2)$ values have been compared with state-of-the-art shell-model calculations using the monopole-corrected realistic charge-dependent Bonn nucleon-nucleon potential. Lifetimes in the $\ensuremath{\nu}{h}_{11/2}$ band are consistent with an interpretation based on the deformation driving properties of a single valence neutron outside of the even-even tellurium core and highlight the unexpected presence of collective behavior as the $N=50$ shell closure is approached. Lifetime measurements for the low-lying positive-parity states also appear to correlate well with shell-model calculations. In addition, a comparison with the proton-unbound nucleus ${}^{109}$I suggests that the presence of a single decoupled valence proton affects the total measured $B(E2)$ strengths in a manner that is not currently well understood.

Published
2012

190. Shell-Structure and Pairing Interaction in Superheavy Nuclei: Rotational Properties of theZ=104NucleusRf256

Author

Sami Rinta-Antila, Matti Leino, O. Dorvaux, R. Lozeva, K. Hauschild, F. Dechery, Paivi Nieminen, A. Lopez-Martens, Ulrika Jakobsson, Andrej Herzan, Juha Sorri, J. Piot, B. Sulignano, F. P. Heßberger, Philippos Papadakis, Mikael Sandzelius, Paul Greenlees, B. J. P. Gall, M. Asai, C. Scholey, Daniel Cox, M. Venhart, Janne Pakarinen, Pauli Peura, T. L. Khoo, Jan Sarén, Ch. Theisen, T. Grahn, D. Seweryniak, Steffen Ketelhut, S. Juutinen, R-D Herzberg, Pekka Ruotsalainen, R. Julin, Juha Uusitalo, E. Parr, Peter M. Jones, P. Rahkila, J. Ljungvall, L.-L. Andersson, Zouhair Asfari, G. Henning, and J. Rubert

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, Shell (structure), General Physics and Astronomy, Moment of inertia, 01 natural sciences, medicine.anatomical_structure, Atomic orbital, Pairing, 0103 physical sciences, medicine, Atomic physics, Nuclear Experiment, 010306 general physics, Spin (physics), Electronic band structure, Nucleus, Energy (signal processing)
Abstract

The rotational band structure of the $Z=104$ nucleus $^{256}\mathrm{Rf}$ has been observed up to a tentative spin of $20\ensuremath{\hbar}$ using state-of-the-art $\ensuremath{\gamma}$-ray spectroscopic techniques. This represents the first such measurement in a superheavy nucleus whose stability is entirely derived from the shell-correction energy. The observed rotational properties are compared to those of neighboring nuclei and it is shown that the kinematic and dynamic moments of inertia are sensitive to the underlying single-particle shell structure and the specific location of high-$j$ orbitals. The moments of inertia therefore provide a sensitive test of shell structure and pairing in superheavy nuclei which is essential to ensure the validity of contemporary nuclear models in this mass region. The data obtained show that there is no deformed shell gap at $Z=104$, which is predicted in a number of current self-consistent mean-field models.

Published
2012

191. In-beam spectroscopy with intense ion beams: Evidence for a rotational structure in246Fm

Author

Daniel Cox, Neil Rowley, Rauno Julin, Andrej Herzan, A. Lopez-Martens, Ulrika Jakobsson, Pauli Peura, Paivi Nieminen, T. L. Khoo, Paul Greenlees, B. Sulignano, K. Hauschild, D. Seweryniak, Janne Pakarinen, Philippos Papadakis, S. Juutinen, T. Grahn, Steffen Ketelhut, F. P. Heßberger, F. Dechery, O. Dorvaux, Sami Rinta-Antila, E. Parr, J. Piot, Juha Uusitalo, Jan Sarén, Matti Leino, B. J. P. Gall, Juha Sorri, Peter B. Jones, C. Scholey, L.-L. Andersson, P. Ruotsalainen, G. Henning, R.-D. Herzberg, J. Rubert, M. Sandzelius, P. Rahkila, J. Ljungvall, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-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), ISOLDE, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)-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)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)

Subjects
Physics, Nuclear and High Energy Physics, ta114, 010308 nuclear & particles physics, 23.20.−g, 24.10.Eq, 21.10.Re, 27.90.+b, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Tracking (particle physics), 01 natural sciences, Recoil electron, Kokeellinen ydinfysiikka, Semiconductor detector, Ion, Recoil, Cardinal point, Nuclear magnetic resonance, 0103 physical sciences, Nuclear Physics - Experiment, Experimental nuclear physics, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, Beam (structure)
Abstract

The rotational structure of ${}^{246}$Fm has been investigated using in-beam $\ensuremath{\gamma}$-ray spectroscopic techniques. The experiment was performed using the JUROGAMII germanium detector array coupled to the gas-filled recoil ion transport unit (RITU) and the gamma recoil electron alpha tagging (GREAT) focal plane detection system. Nuclei of ${}^{246}$Fm were produced using a 186 MeV beam of ${}^{40}$Ar impinging on a ${}^{208}$Pb target. The JUROGAMII array was fully instrumented with Tracking Numerical Treatment 2 Dubna (TNT2D) digital acquisition cards. The use of digital electronics and a rotating target allowed for unprecedented beam intensities of up to 71 particle-nanoamperes for prompt $\ensuremath{\gamma}$-ray spectroscopy at a level of approximately 11 nb. With all these major experimental advances a rotational band is observed in ${}^{246}$Fm.

Published
2012

192. Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes

Author

C. Bernards, Jan Diriken, M. Pfeiffer, K. Moschner, P. Reiter, M. Rudigier, H. De Witte, Jonathan Butterworth, J. M. Daugas, D. Voulot, Iain Darby, Mark Huyse, Takaharu Otsuka, R. R. Rodríguez-Guzmán, Liam Gaffney, R. Gernhäuser, P. Van Duppen, R. Krücken, Fredrik Wenander, Vinzenz Bildstein, N. Warr, M. Zielinska, D. Mücher, T. Kröll, B. S. Nara Singh, C. Mihai, M. Seidlitz, Joakim Cederkäll, Georgi P. Georgiev, B. Bastin, P. Thöle, D. Radeck, Susan Rigby, S. Das Gupta, D. G. Jenkins, M. Albers, C. Fransen, J. Van de Walle, R. Wadsworth, Pedro Sarriguren, T. Thomas, B. Siebeck, J. Jolie, Marcus Scheck, N. Marginean, M. Hackstein, D. M. Filipescu, L. Bettermann, Janne Pakarinen, Thomas Davinson, G. S. Simpson, P. J. Napiorkowski, E. Fiori, A. Blazhev, K. Nowak, L. M. Robledo, Joonas Konki, M. Kowalczyk, R. Lutter, Herbert Hess, K. O. Zell, Kathrin Wimmer, Kosuke Nomura, M. Vermeulen, M. Cappellazzo, Stefan Heinze, J. Litzinger, D. Cline, C. Bauer, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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)-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)-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 Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), REX-ISOLDE, Research unit Nuclear & Hadron Physics, and UAM. Departamento de Física Teórica

Subjects
Quantum phase transition, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], REX-ISOLDE, Nuclear Theory, QUANTUM PHASE-TRANSITIONS, General Physics and Astronomy, chemistry.chemical_element, Context (language use), Coulomb excitation, Nuclear Structure, 01 natural sciences, REGION, Nuclear physics, 0103 physical sciences, Nuclear Physics - Experiment, Neutron, 010306 general physics, Nuclear Experiment, DETECTOR, INTERACTING BOSONS, Physics, EXCITATIONS, COLLECTIVE NUCLEAR-STATES, ta114, 010308 nuclear & particles physics, Krypton, Física, chemistry, Excited state, SHELL-MODEL, Interacting boson model, Atomic physics, Ground state
Abstract

The neutron-rich nuclei Kr94,96 were studied via projectile Coulomb excitation at the REX-ISOLDE facility at CERN. Level energies of the first excited 2 + states and their absolute E2 transition strengths to the ground state are determined and discussed in the context of the E(21+) and B(E2;21+→01+) systematics of the krypton chain. Contrary to previously published results no sudden onset of deformation is observed. This experimental result is supported by a new proton-neutron interacting boson model calculation based on the constrained Hartree-Fock-Bogoliubov approach using the microscopic Gogny-D1M energy density functional. © 2012 American Physical Society., This work was supported by the BMBF under Contracts No. 06KY9136 and No. 06MT238, by ENSAR, by the DFG Cluster of Excellence Origin and Structure of the Universe, and by the grant-in-aid for scientific research for JSPS Fellows (Grant No. 217368). One of the authors (J. D.) would like to acknowledge the support of FWOVlaanderen (Belgium).

Published
2012

193. A Geant4 simulation package for the sage spectrometer

Author

Joonas Konki, Mikael Sandzelius, Panu Rahkila, Daniel Cox, Janne Pakarinen, Paul Greenlees, J. Sorri, Rolf-Dietmar Herzberg, K. Hauschild, Philippos Papadakis, P. A. Butler, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and 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)

Subjects
Electromagnetic field, History, Silicon, Spectrometer, 010308 nuclear & particles physics, Computer science, Physics::Instrumentation and Detectors, Detector, chemistry.chemical_element, Experimental data, Germanium, ComputerApplications_COMPUTERSINOTHERSYSTEMS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, Computational science, Kokeellinen ydinfysiikka, chemistry, 0103 physical sciences, Computer Science::Mathematical Software, 29.40.Wk Solid-state detectors 29.30.Kv X- and gamma-ray spectroscopy 07.85.Nc X-ray and gamma-ray spectrometers 29.30.Dn Electron spectroscopy, Experimental nuclear physics, 010306 general physics
Abstract

International audience; A comprehensive Geant4 simulation was built for the SAGE spectrometer. The simulation package includes the silicon and germanium detectors, the mechanical structure and the electromagnetic fields present in SAGE. This simulation can be used for making predictions through simulating experiments and for comparing simulated and experimental data to better understand the underlying physics.

Published
2011

194. Combined in-beam electron andγ-ray spectroscopy ofHg184,186

Author

Janne Pakarinen, Philippos Papadakis, S. Juutinen, J. Srebrny, C. Scholey, Andrej Herzan, R.-D. Herzberg, N. Bree, R. D. Page, Paul Greenlees, Matti Leino, H. V. Watkins, Liam Gaffney, Peter M. Jones, A. Lopez-Martens, Ulrika Jakobsson, T. Grahn, Steffen Ketelhut, D. T. Joss, M. Kowalczyk, Panu Ruotsalainen, P. A. Butler, Pauli Peura, Mikael Sandzelius, Sami Rinta-Antila, Marc Huyse, P. Van Duppen, R. J. Carrol, Marcus Scheck, K. Hauschild, P. Rahkila, Jan Sarén, Juha Uusitalo, Juha Sorri, Paivi Nieminen, A. C. Larsen, Daniel Cox, and R. Julin

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Yrast, Electron, 7. Clean energy, 01 natural sciences, Electron spectroscopy, 3. Good health, Internal conversion, Excited state, 0103 physical sciences, Gamma spectroscopy, Atomic physics, 010306 general physics, Spectroscopy, Radioactive decay
Abstract

By exploiting the SAGE spectrometer a simultaneous measurement of conversion electrons and {gamma} rays emitted in the de-excitation of excited levels in the neutron-deficient nuclei {sup 184,186}Hg was performed. The light Hg isotopes under investigation were produced using the 4n channels of the fusion-evaporation reactions of {sup 40}Ar and {sup 148,150}Sm. The measured K- and L-conversion electron ratios confirmed the stretched E2 nature of several transitions of the yrast bands in {sup 184,186}Hg. Additional information on the E0 component of the 2{sub 2}{sup +}{yields}2{sub 1}{sup +} transition in {sup 186}Hg was obtained.

Published
2011

195. Discovery of a 10μs isomeric state in63139Eu

Author

Pauli Peura, M. Leino, S. V. Rigby, C. Scholey, A. Kishada, Juha Uusitalo, S. Juutinen, B. J. Varley, P. Rahkila, A.-P. Leppänen, Ulrika Jakobsson, R. Julin, Jan Sarén, Paivi Nieminen, M. Venhart, Juha Sorri, S. Eeckhaudt, M. Nyman, Janne Pakarinen, Paul Greenlees, M. G. Procter, Peter B. Jones, P. J. R. Mason, D. M. Cullen, T. Grahn, Steffen Ketelhut, and K. Mäntyniemi

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Crystallography, Proton, Excited state, Hadron, Elementary particle, Fermion, Nucleon, Ground state
Abstract

Recoil-isomer tagging with the {sup 54}Fe+{sup 92}Mo reaction was used to establish a 10(2)-{mu}s isomeric state in {sup 139}Eu. Prompt versus delayed {gamma}-ray coincidence data have revealed the presence of a prompt rotational band built upon the isomer. The alignment properties of the states in this band show that the isomer is based upon a proton g{sub 7/2} configuration. The decay of the isomer takes place through a single 26-keV E1 transition. The {gamma}-ray transition strength for this decay is consistent with those established in the neighboring isomeric gamma-soft nuclei. In these nuclei, isomers are expected to form as a consequence of differences in nuclear shapes or configurations, and the natural hindrance associated with configuration-changing E1 transitions. The isomeric nature of the state in {sup 139}Eu is reasoned to be because of difference in shape of the proton g{sub 7/2} state and the proton h{sub 11/2} ground state to which it decays.

Published
2011

196. γ-soft shapes and quasiparticle excitations in73161Ta88

Author

C. Scholey, J. Simpson, C. J. Barton, Heikki Kettunen, B. Hadinia, J. Perkowski, D. T. Joss, Paivi Nieminen, E. S. Paul, Juha Uusitalo, R. D. Page, D. R. Wiseman, P. Rahkila, Peter B. Jones, Janne Pakarinen, Paul Greenlees, S. Juutinen, Ramon Wyss, Bo Cederwall, M. Leino, T. Grahn, Duncan Appelbe, A.-P. Leppänen, R. Julin, S. Eeckhaudt, D. D. Warner, and Karin Lagergren

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Excited state, Yrast, Hadron, Quasiparticle, Gamma ray, Neutron, Atomic physics, Nucleon
Abstract

Excited states in the neutron-deficient odd-Z nuclide Ta-161 were identified for the first time using the Cd-106(Ni-58,3p gamma) reaction at a beam energy of 270 MeV. The pi h(11/2) band, yrast at ...

Published
2011

197. Ultrathin (1*2)-Sn layer on GaAs(100) and InAs(100) substrates:A catalyst for removal of amorphous surface oxides

Author

Johan Adell, Marko Patrick John Punkkinen, Janne Pakarinen, Kalevi Kokko, Johnny Dahl, M. Pessa, Mircea Guina, Janusz Kanski, Ville Polojärvi, Janusz Sadowski, J. Lang, Mikhail Kuzmin, Mikko Tuominen, I. J. Vayrynen, Pekka Laukkanen, and V. Tuominen

Subjects
low energy electron diffraction, Materials science, ta114, Physics and Astronomy (miscellaneous), Low-energy electron diffraction, Passivation, heat treatment, ab initio calculations, Analytical chemistry, Oxide, metallic thin films, surface composition, catalysts, Amorphous solid, chemistry.chemical_compound, Adsorption, photoelectron spectra, X-ray photoelectron spectroscopy, Electron diffraction, chemistry, adsorption, amorphous state, Desorption, tin, desorption
Abstract

Amorphous surface oxides of III–V semiconductors are harmful in many contexts of device development. Using low-energy electron diffraction and photoelectron spectroscopy, we demonstrate that surface oxides formed at Sn-capped GaAs(100) and InAs(100) surfaces in air are effectively removed by heating. This Sn-mediated oxide desorption procedure results in the initial well-defined Sn-stabilized (1×2) surface even for samples exposed to air for a prolonged time. Based on ab initio calculations we propose that the phenomenon is due to indirect and direct effects of Sn. The Sn-induced surface composition weakens oxygen adsorption.

Published
2011

198. Shape coexistence at the proton drip-line: First identification of excited states inPb180

Author

H. Koivisto, C. Scholey, S. Juutinen, Steffen Ketelhut, Matti Leino, Panu Ruotsalainen, P. Rahkila, Marina Petri, Pauli Peura, Jan Sarén, Juha Uusitalo, Janne Pakarinen, P.-H. Heenen, A. G. Tuff, Stefanos Paschalis, M. Nyman, C. Gray-Jones, M. Bender, R. Julin, R. Wadsworth, T. Ropponen, D. G. Jenkins, Paul Greenlees, Peter M. Jones, Philippos Papadakis, Oliver J. Roberts, Paivi Nieminen, Juha Sorri, and Ulrika Jakobsson

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Neutron emission, Hadron, 01 natural sciences, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, Ground state, Spectroscopy, Nucleon
Abstract

Excited states in the extremely neutron-deficient nucleus {sup 180}Pb have been identified for the first time using the JUROGAM II array in conjunction with the RITU recoil separator at the Accelerator Laboratory of the University of Jyvaeskylae. This study lies at the limit of what is presently achievable with in-beam spectroscopy, with an estimated cross section of only 10 nb for the {sup 92}Mo({sup 90}Zr,2n){sup 180}Pb reaction. A continuation of the trend observed in {sup 182}Pb and {sup 184}Pb is seen, where the prolate minimum continues to rise beyond the N=104 midshell with respect to the spherical ground state. Beyond-mean-field calculations are in reasonable correspondence with the trends deduced from experiment.

Published
2010

199. The SAGE spectrometer: A tool for combined in-beam gamma-ray and conversion electron spectroscopy

Author

J.R. Cresswell, Peter M. Jones, J. Thornhill, D. Wells, Mikael Sandzelius, D. Seddon, P. J. Coleman-Smith, J. Sorri, Rolf-Dietmar Herzberg, R. Julin, J. Simpson, S. C. Letts, E. Parr, Daniel Cox, V. F. E. Pucknell, Philippos Papadakis, I.H. Lazarus, J.A. Sampson, Janne Pakarinen, Pauli Peura, P. A. Butler, Panu Rahkila, Paul Greenlees, K. Hauschild, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and 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)

Subjects
Physics, History, Spectrometer, 010308 nuclear & particles physics, business.industry, Physics::Instrumentation and Detectors, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Electron spectroscopy, Recoil separator, Computer Science Applications, Education, Semiconductor detector, Nuclear physics, Optics, Internal conversion, 0103 physical sciences, Silicon detector, High Energy Physics::Experiment, 010306 general physics, business, Nuclear Experiment, Beam (structure)
Abstract

International audience; The sage spectrometer allows simultaneous in-beam -ray and internal conversion electron measurements, by combining a germanium detector array with a highly segmented silicon detector and an electron transport system. sage is coupled with the ritu gas- lled recoil separator and the great focal-plane spectrometer for recoil-decay tagging studies. Digital electronics are used both for the ray and the electron parts of the spectrometer. sage was commissioned in the Accelerator Laboratory of the University of Jyvaskyla in the beginning of 2010.

Published
2010

200. High-spin intruder band inIn107

Author

M. Nyman, Karin Lagergren, C. Scholey, P. Rahkila, Ingemar Ragnarsson, M. Leino, Juha Uusitalo, S. Eeckhaudt, D. T. Joss, E. S. Paul, A. Johnson, T. Grahn, Bo Cederwall, D. R. Wiseman, Paul Greenlees, A.-P. Leppänen, Eiji Ideguchi, R. Julin, A. V. Afanasjev, Ramon Wyss, Janne Pakarinen, R. Wadsworth, Heikki Kettunen, E. Ganioglu, Paivi Nieminen, Torbjörn Bäck, Baharak Hadinia, and S. Juutinen

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Gamma ray, Electromagnetic radiation, medicine.anatomical_structure, Cascade, Excited state, medicine, Atomic physics, Nuclear Experiment, Spin (physics), Nucleus, Radioactive decay
Abstract

High-spin states in the neutron-deficient nucleus In-107 were studied via the Ni-58(Cr-52,3p) reaction. In-beam gamma rays were measured using the JUROGAM detector array. A rotational cascade consisting of ten gamma-ray transitions, which decays to the 19/2(+) level at 2.002 MeV, was observed. The band exhibits the features typical for smooth terminating bands that also appear in rotational bands of heavier nuclei in the A similar to 100 region. The results are compared with total Routhian surface and cranked Nilsson-Strutinsky calculations.

Published
2010

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