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1. Physics opportunities with the Advanced Gamma Tracking Array: AGATA

Author

W. Korten, A. Bracco, A. Atac, G. Benzoni, S. Leoni, P. Reiter, A. Goasduff, Eric Clément, K. A. Gladnishki, F. Recchia, A. Jungclaus, Bo Cederwall, G. Duchêne, D. G. Jenkins, A. Nannini, P. Bednarczyk, M. Zielińska, Dirk Rudolph, Riccardo Raabe, B. Million, A. Tumino, P. J. Nolan, D. R. Napoli, B. Fernández-Domínguez, F. Didierjean, Johan Nyberg, Herbert Hess, A. Gadea, D. Tonev, M. Ciemala, G. Rainovski, D. T. Doherty, Joakim Cederkäll, A. Obertelli, J. Gerl, J. J. Valiente-Dobón, B. Fornal, Begoña Quintana, J. Ljungvall, Ch. Theisen, Janne Pakarinen, G. de Angelis, P. R. John, M. Kmiecik, O. Wieland, Zs. Dombrádi, J. Simpson, A. J. Boston, M. Górska, Zs. Podolyák, D. Curien, J. Dudek, Norbert Pietralla, F. C. L. Crespi, A. Maj, K. Wimmer, Paul Greenlees, D. Beaumel, M. Labiche, A. Lopez-Martens, A. Korichi, M. A. Bentley, D. Mengoni, Liam Gaffney, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), 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), 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 Pluridisciplinaire Hubert Curien (IPHC), 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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), AGATA, 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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ministerio de Ciencia, Innovación y Universidades (España), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Radioactive ion beams, Nuclear and High Energy Physics, NEUTRON-RICH, Position resolution, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Accelerator Physics and Instrumentation, Tracking (particle physics), 7. Clean energy, 01 natural sciences, Physics, Particles & Fields, Subatomär fysik, Optics, Subatomic Physics, 0103 physical sciences, Gamma spectroscopy, SPECTROMETER, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], SUPERHEAVY ELEMENTS, 010306 general physics, ROTATIONAL BAND, DETECTOR, Physics, Science & Technology, Spectrometer, 010308 nuclear & particles physics, business.industry, European research, Detector, Acceleratorfysik och instrumentering, FISSION-BARRIERS, PERFORMANCE, Physics, Nuclear, SPIN, Physical Sciences, SHELL-MODEL, AGATA, business, DECAY
Abstract

AGATA Collaboration, New physics opportunities are opening up by the Advanced Gamma Tracking Array, AGATA, as it evolves to the full 4π instrument. AGATA is a high-resolution γ-ray spectrometer, solely built from highly segmented high-purity Ge detectors, capable of measuring γ rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual γ-ray interactions, and very high count-rate capability. As a travelling detector AGATA will be employed at all major current and near-future European research facilities delivering stable and radioactive ion beams., The AGATA project has been supported by the European Structural Funds FSE FEDER, the Academy of Finland FIRI program, Finland, the Direction de Recherches Fondamentales of CEA, France, the Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) of CNRS, France, the Bundesministerium für Bildung und Forschung (BMBF), Germany, the Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Hungary, the IstitutoNazionale di Fisica Nucleare (INFN), Italy, theNational Science Center (NCN), Poland, the Knut and AliceWallenberg foundation (Sweden), the Swedish Research Council, the Conselleria d’Educació, Investigació, Cultura i Esport, Generalitat Valenciana and Ministerio de Ciencia, Innovación y Universidades, Spain, the Türkiye Bilimsel ve Teknolojik Ara¸stirma Kurumu (TÜBITAK), Turkey, and the United Kingdom Research and Innovation – Science and Technology Facilities Council (UKRI-STFC).

Published
2020

2. Evidence for octupole collectivity in $^{172}{\mathrm {Pt}}$

Author

E. Ganioglu, Rauno Julin, I. Özgür, R. D. Page, Eiji Ideguchi, O. Aktas, Sanna Stolze, E. S. Paul, J. Hilton, Torbjörn Bäck, H. W. Li, J. J. Valiente-Dobón, S. Matta, Mikael Sandzelius, Steffen Ketelhut, B. S. Nara Singh, Panu Rahkila, Tuomas Grahn, U. Jakobsson, Panu Ruotsalainen, C. M. Petrache, Megumi Niikura, D. M. Cullen, Jari Partanen, K. Andgren, Janne Pakarinen, Bo Cederwall, A. Ertoprak, B. Hadinia, D. Hodge, M. Kumar Raju, T. Calverley, Juha Sorri, Juha Uusitalo, V. Modamio, H. Badran, Paul Greenlees, Chong Qi, M. Nyman, Pauli Peura, Daniel Cox, A. Johnson, Jan Sarén, Y. D. Fang, Peter M. Jones, Michael Taylor, Matti Leino, Ramon Wyss, Thomas Braunroth, Catherine Scholey, H. Liu, Sakari Juutinen, Roberto Liotta, M. B. Gomez Hornillos, M. Doncel, M. M. Giles, P. Subramaniam, Philippos Papadakis, Anton Khaplanov, 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, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Nuclear fusion, 010306 general physics, Nucleus, Excitation
Abstract

Excited states in the extremely neutron-deficient nucleus $$^{172}{\mathrm {Pt}}$$172Pt were populated via $$^{96}\mathrm {Ru}(^{78}\mathrm {Kr},2p)$$96Ru(78Kr,2p) and $$^{92}\mathrm {Mo}(^{83}\mathrm {Kr},3n)$$92Mo(83Kr,3n) reactions. The level scheme has been extended up to an excitation energy of $$\approx 5~\hbox {MeV}$$≈5MeV and tentative spin-parity assignments up to $$I^\pi = 18^+$$Iπ=18+. Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negative-parity band. The lowest member of this negative-parity structure was firmly assigned spin-parity $$3^-$$3-. In addition, we observed an E3 transition from this $$3^-$$3- state to the ground state, providing direct evidence for octupole collectivity in $$^{172}{\mathrm {Pt}}$$172Pt. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the $$3^-$$3- state as a collective octupole-vibrational state.

Published
2020

3. Highly deformed bands in Nd nuclei: New results and consistent interpretation within the cranked Nilsson-Strutinsky formalism

Author

C. Scholey, Rauno Julin, S. Juutinen, Mikael Sandzelius, A. Ertoprak, J. Srebrny, J. Konki, Tuomas Grahn, A. Tucholski, Daniel Cox, Juha Uusitalo, H. Badran, Juha Sorri, Paul Greenlees, Bo Cederwall, Song Guo, E. Dupont, C. M. Petrache, Sanna Stolze, József Tímár, A. Astier, Philippos Papadakis, X. H. Zhou, Jukka Partanen, Huan Liu, T. Calverley, István Kuti, Jianlu Wang, K. K. Zheng, B. F. Lv, Jan Sarén, J. Hilton, O. Aktas, Janne Pakarinen, Panu Ruotsalainen, Corina Andreoiu, Panu Rahkila, M. L. Liu, 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, 010308 nuclear & particles physics, Yrast, Nuclear Theory, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, 01 natural sciences, Formalism (philosophy of mathematics), Atomic orbital, 0103 physical sciences, Neutron, Band crossing, Atomic physics, ydinfysiikka, 010306 general physics
Abstract

International audience; Three new highly-deformed (HD) bands are identified in Nd136 and the highly deformed band of Nd137 is extended at higher spin by four transitions, revealing a band crossing associated with the occupation of the second νi13/2 intruder orbital. Extended cranked Nilsson-Strutinsky calculations are performed for all HD bands observed in Nd134, Nd136, and Nd137, achieving for the first time a consistent interpretation of all HD bands in the Nd nuclei. The new interpretation has significant consequences, like the change of parity of the yrast HD bands of Nd134 and Nd136, and the involvement of two negative-parity neutron intruder orbitals in the configurations of most HD bands. The present experimental results and their theoretical interpretation represent an important step forward in the understanding of the second-minimum excitations in the Nd nuclei.

Published
2019

4. Collective rotation of an oblate nucleus at very high spin

Author

A. Astier, C. M. Petrache, József Tímár, Philippos Papadakis, Song Guo, Jan Sarén, Tuomas Grahn, Juha Uusitalo, Rauno Julin, Joonas Konki, Sanna Stolze, Paul Greenlees, Sakari Juutinen, O. Aktas, J. Srebrny, Juha Sorri, István Kuti, S. Frauendorf, Daniel Cox, E. Dupont, B. F. Lv, Jari Partanen, Bo Cederwall, Catherine Scholey, Janne Pakarinen, Panu Rahkila, M. L. Liu, Kaihang Wang, Corina Andreoiu, Mikael Sandzelius, X. H. Zhou, Huan Liu, H. Badran, A. Ertoprak, A. Tucholski, 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), and 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)

Subjects
Physics, nuclear spin, ta114, 010308 nuclear & particles physics, Nuclear Theory, collective models, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Rotation, Nuclear Structure, 01 natural sciences, medicine.anatomical_structure, electromagnetic transitions, 0103 physical sciences, Quadrupole, Oblate spheroid, medicine, Equidistant, collective levels, Atomic physics, 010306 general physics, Spin (physics), ydinfysiikka, Nucleus, Sequence (medicine)
Abstract

International audience; A sequence of nine almost equidistant quadrupole transitions is observed in Nd137. The sequence represents an extremely regular rotational band that extends to a spin of about 75/2 and an excitation energy of ≈4.5MeV above yrast. Cranked mean-field calculations of the Nilsson-Strutinsky type suggest an oblate shape for the band. They reproduce the observed I(I+1) dependence of the rotational energy whereas predicting a pronounced decrease in the deformation, which is the hallmark of antimagnetic rotation.

Published
2019

5. Confirming band assignments in $^{167}$ytterbium with gamma-gamma-electron triple-coincidence spectroscopy

Author

A. K. Mistry, Philippos Papadakis, S. Juutinen, Pauli Peura, A. Lopez-Martens, Daniel Cox, Andrej Herzan, Juha Sorri, Juha Uusitalo, Paul Greenlees, Ulrika Jakobsson, C. Scholey, James Smallcombe, R-D Herzberg, Panu Ruotsalainen, K. Hauschild, T. Grahn, Sami Rinta-Antila, Steffen Ketelhut, P. A. Butler, Jan Sarén, Peter M. Jones, D. G. Jenkins, Mikael Sandzelius, Paivi Nieminen, E. Parr, R. Julin, C. J. Barton, P. J. Davies, Matti Leino, Janne Pakarinen, L.-L. Andersson, P. Rahkila, 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, Ytterbium, Nuclear and High Energy Physics, Spectrometer, Silicon, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, chemistry.chemical_element, Germanium, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, chemistry, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Atomic physics, 010306 general physics, Spectroscopy, Spin (physics), Nuclear Experiment
Abstract

International audience; Multipolarity measurements are presented for transitions in the deformed odd-mass nucleus$^{167}$ Yb in support of tentative spin assignments and level interpretations based upon the cranked-Nilsson model. Internal-conversion coefficients were measured with the SAGE (Silicon And GErmanium) spectrometer confirming several E2 transition assignments. The array of high-purity germanium detectors enabled the recording of high-multiplicity events from which $\gamma\gamma\gamma$ and $\gamma\gamma e^{-}$ data sets were extracted and the technique of high-fold $\gamma$ -ray gating was demonstrated to cleanly isolate transitions of interest.

Published
2019

6. Evidence of chiral bands in even-even nuclei

Author

Pengwei Zhao, Jan Sarén, E. Dupont, Panu Rahkila, M. L. Liu, C. M. Petrache, József Tímár, Mikael Sandzelius, A. Tucholski, Paul Greenlees, Sakari Juutinen, Yarong Wang, Jari Partanen, O. Aktas, H. Badran, Janne Pakarinen, Corina Andreoiu, Tuomas Grahn, Kaihang Wang, István Kuti, Jie Meng, S. Matta, Joonas Konki, P. Subramaniam, Shishu Zhang, A. Ertoprak, X. H. Zhou, Philippos Papadakis, Huan Liu, Juha Uusitalo, Bo Cederwall, Song Guo, Sanna Stolze, Juha Sorri, Z. X. Ren, A. Astier, Rauno Julin, B. F. Lv, J. Srebrny, Catherine Scholey, Daniel Cox, 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), and 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)

Subjects
Physics, level densities, ta114, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Molecular physics, nuclear structure and decays, medicine.anatomical_structure, electromagnetic transitions, Physical Sciences, 0103 physical sciences, medicine, Fysik, collective levels, energy levels, 010306 general physics, Nucleus
Abstract

Evidence for chiral doublet bands has been observed for the first time in the even-even nucleus 136 Nd . One chiral band was firmly established. Four other candidates for chiral bands were also identified, which can contribute to the realization of the multiple pairs of chiral doublet bands ( M χ D ) phenomenon. The observed bands are investigated by the constrained and tilted axis cranking covariant density functional theory (TAC-CDFT). Possible configurations have been explored. The experimental energy spectra, angular momenta, and B ( M 1 ) / B ( E 2 ) values for the assigned configurations are globally reproduced by TAC-CDFT. Calculated results support the chiral interpretation of the observed bands, which correspond to shapes with maximum triaxiality induced by different multiquasiparticle configurations in 136 Nd . peerReviewed

Published
2018

7. Collectivity in ${}^{\mathrm{196,198}}$Pb isotopes probed in Coulomb-excitation experiments at REX-ISOLDE

Author

B Seibeck, K Hadyńska-Klȩk, Pascal Fernier, D. G. Jenkins, A. Herzáň, E. Rapisarda, Philippos Papadakis, K. Wrzosek-Lipska, Fredrik Wenander, B Lannoo, D. Voulot, Alejandro Algora, Pauli Peura, Thierry Stora, G. Rainovski, Liam Gaffney, Joonas Konki, Tuomas Grahn, C. Bauer, Mark Huyse, J. Iwanicki, A. Blazhev, N. Warr, Janne Pakarinen, P. Reiter, P. Van Duppen, S. Sambi, M. Seidlitz, M. J. Vermeulen, Panu Rahkila, Thomas Elias Cocolios, N. Kesteloot, N. Bree, Jan Diriken, Marcus Scheck, M. Zielińska, Ulrika Jakobsson, H. De Witte, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), 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, and Helsinki Institute of Physics

Subjects
Nuclear and High Energy Physics, Coulomb excitation, REX-ISOLDE, SHELL, Hadron, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 114 Physical sciences, 01 natural sciences, Nuclear physics, SHAPE COEXISTENCE, 0103 physical sciences, SCATTERING, radioactive ion beams, ACCELERATED RADIOACTIVE BEAMS, 010306 general physics, Physics, Pb isotopes, NUCLEI, 010308 nuclear & particles physics, Baryon, gamma-ray spectroscopy, EXCITED-STATES, Coulomb-excitation experiment, Excited state, Atomic physics, Ground state, Nucleon, gamma transitions and level energies, Energy (signal processing)
Abstract

The neutron-deficient ${}^{\mathrm{196,198}}$Pb isotopes have been studied in Coulomb-excitation experiments employing the Miniball γ-ray spectrometer and radioactive ion beams from the REX-ISOLDE post-accelerator at CERN. The reduced transition probabilities of the first excited 2+ states in 196Pb and 198Pb nuclei have been measured for the first time. Values of $B(E2)={18.2}_{-4.1}^{+4.8}$ W.u. and $B(E2)={13.1}_{-3.5}^{+4.9}$ W.u., were obtained, respectively. The experiment sheds light on the development of collectivity when moving from the regime governed by the generalised seniority scheme to a region, where intruding structures, associated with different deformed shapes, start to come down in energy and approach the spherical ground state. journal_title: Journal of Physics G: Nuclear and Particle Physics article_type: paper article_title: Collectivity in ${}^{\mathrm{196,198}}$Pb isotopes probed in Coulomb-excitation experiments at REX-ISOLDE copyright_information: © 2017 IOP Publishing Ltd date_received: 2016-10-31 date_accepted: 2017-03-17 date_epub: 2017-05-03 ispartof: Journal of Physics G, Nuclear and Particle Physics vol:44 issue:6 status: published

Published
2017

8. Towards saturation of the electron-capture delayed fission probability: The new isotopes $^{240}Es$ and $^{236}Bk$

Author

Rauno Julin, J. Khuyagbaatar, Bettina Lommel, Juha Sorri, Kalle Auranen, R. Briselet, Philippos Papadakis, R-D Herzberg, Paul Greenlees, K. Hauschild, Pauli Peura, J. Krier, Katsuhisa Nishio, Panu Rahkila, S. Juutinen, Sanna Stolze, Joonas Konki, B. Sulignano, Michael Block, Egon Jäger, Ch. Theisen, Mahananda Dasgupta, Alexander Yakushev, Tuomas Grahn, M. J. Mallaburn, Jari Partanen, K. Rezynkina, Janne Pakarinen, A. Ward, Andrej Herzan, Duc Huy Luong, Mikael Sandzelius, David Hinde, V. Yakusheva, Panu Ruotsalainen, Juha Uusitalo, Daniel Cox, A. Di Nitto, Jan Sarén, H. Badran, Ch. E. Düllmann, Birgit Kindler, F. P. Heßberger, A. Lopez-Martens, Matti Leino, C. Scholey, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), 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), Konki, J., Khuyagbaatar, J., Uusitalo, J., Greenlees, P. T., Auranen, K., Badran, H., Block, M., Briselet, R., Cox, D. M., Dasgupta, M., Di Nitto, A., Dullmann, C. E., Grahn, T., Hauschild, K., Herzan, A., Herzberg, R. -D., Hessberger, F. P., Hinde, D. J., Julin, R., Juutinen, S., Jager, E., Kindler, B., Krier, J., Leino, M., Lommel, B., Lopez-Martens, A., Luong, D. H., Mallaburn, M., Nishio, K., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Rezynkina, K., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Sulignano, B., Theisen, C., Ward, A., Yakushev, A., and Yakusheva, V.

Subjects
Electron-capture delayed fission, Nuclear and High Energy Physics, Electron capture, Fission, Fusion–evaporation reaction, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 236 Bk, 01 natural sciences, 7. Clean energy, Recoil separator, Nuclear physics, fusion-evaporation reactions, 236Bk, 240Es, 240 Es, 0103 physical sciences, ddc:530, 010306 general physics, α decay, isotopes, Physics, Isotope, ta114, Isotopes with mass 236–240, 010308 nuclear & particles physics, lcsh:QC1-999, Exponential function, Bk, mass, Atomic physics, Saturation (chemistry), Fusion–evaporation reactions, α particles, lcsh:Physics, Radioactive decay
Abstract

The new neutron-deficient nuclei 240 Es and 236 Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from 240 Es produced in the fusion–evaporation reaction 209 Bi( 34 S,3n) 240 Es. Half-lives of 6 ( 2 ) s and 22 − 6 + 13 s were obtained for 240 Es and 236 Bk, respectively. Two groups of α particles with energies E α = 8.19 ( 3 ) MeV and 8.09 ( 3 ) MeV were unambiguously assigned to 240 Es. Electron-capture delayed fission branches with probabilities of 0.16 ( 6 ) and 0.04 ( 2 ) were measured for 240 Es and 236 Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.

Published
2017

9. Analysis methods of safe Coulomb-excitation experiments with radioactive ion beams using the gosia code

Author

Liam Gaffney, K. Wrzosek-Lipska, Tuomas Grahn, N. Kesteloot, Eric Clément, Janne Pakarinen, M. Zielinska, N. Warr, P. Van Duppen, Pawel Napiorkowski, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), 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, 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), 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
Radioactive ion beams, Nuclear and High Energy Physics, Ion beam, fuusioreaktio, Coulomb excitation, Data analysis, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Electromagnetic moments, 25.70.De, 21.10.Ky, 29.38.Gj, 29.85.Fj, 0103 physical sciences, Nuclear Experiment (nucl-ex), particle and nuclear physics, 010306 general physics, heavy ions, Nuclear Experiment, Analysis method, Physics, 010308 nuclear & particles physics, Reaccelerated radioactive beams, 3. Good health, Data point, hadrons, Quadrupole, ydinfysiikka
Abstract

With the recent advances in radioactive ion beam technology, Coulomb excitation at safe energies becomes an important experimental tool in nuclear-structure physics. The usefulness of the technique to extract key information on the electromagnetic properties of nuclei has been demonstrated since the 1960's with stable beam and target combinations. New challenges present themselves when studying exotic nuclei with this technique, including dealing with low statistics or number of data points, absolute and relative normalisation of the measured cross sections and a lack of complimentary experimental data, such as excited-state lifetimes and branching ratios. This paper addresses some of these common issues and presents analysis techniques to extract transition strengths and quadrupole moments utilising the least-squares fit code, {\rmfamily \textsc{gosia}}., 14 pages, 10 figures, to be published in European Physical Journal A

Published
2016

10. Collective 2$^{+1}$ excitations in$^{206}$Po and$^{208,210}$Rn

Author

C. Bernards, P. Reiter, Jouni Suhonen, E. Rapisarda, H. De Witte, Marcus Scheck, V. Werner, Joonas Konki, A. Vogt, Rauno Julin, M. Thürauf, K. Reynders, J. Elseviers, A. Damyanova, S. Sambi, T. Grahn, T. Steinbach, K. Wrzosek-Lipska, M. Rudiger, C. Bauer, T. De Coster, M. J. Vermeulen, M. Venhart, Liam Gaffney, M. Zielińska, M. Pfeiffer, Martin Veselsky, D. Radeck, P. Peura, N. Kesteloot, Th. Kröll, S. Bönig, Marc Huyse, S. Stolze, L. Lewandowski, B. Siebeck, U. Jakobsson, K. Auranen, M. Seidlitz, Panu Rahkila, A. Herzáň, A. Blazhev, P. Thoele, Janne Pakarinen, M. D. Salsac, Lotta Jokiniemi, M. Albers, P. A. Butler, K. Moschner, P. Van Duppen, N. Warr, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Nuclear Theory, radon, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Isotopes of palladium, collective excitation, Excited state, 0103 physical sciences, Quasiparticle, Physics::Accelerator Physics, Atomic physics, 010306 general physics, Nuclear Experiment, Open shell, polonium, Excitation, excited states
Abstract

In the present study, $B(E2; 2^{+}_{1}\rightarrow 0^{+}_{1})$ values have been measured in the 208,210Rn and 206Po nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERN-ISOLDE. These nuclei have been proposed to lie in, or at the boundary of the region where the seniority scheme should persist. However, contributions from collective excitations are likely to be present when moving away from the N=126 closed shell. Such an effect is confirmed by the observed increased collectivity of the $2^{+}_{1}\rightarrow 0^{+}_{1}$ transitions. Experimental results have been interpreted with the aid of theoretical studies carried out within the BCS-based QRPA framework.

Published
2016

11. Simulation of the SAGE spectrometer

Author

Philippos Papadakis, Joonas Konki, J. Sorri, Mikael Sandzelius, Paul Greenlees, Janne Pakarinen, K. Hauschild, Daniel Cox, Panu Rahkila, R.-D. Herzberg, 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, [PHYS]Physics [physics], Nuclear and High Energy Physics, IN-BEAM, SPECTROSCOPY, Spectrometer, NUCLEI, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, BEAM GAMMA-RAY, Hadron, Detector, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, User input, Nuclear physics, 0103 physical sciences, Computer Science::Mathematical Software, DETECTORS, Nuclear fusion, 010306 general physics, Spectroscopy, Nuclear Experiment
Abstract

International audience; The SAGE spectrometer combines a Ge-detector array with a Si detector to allow simultaneous detection of gamma-rays and electrons. A comprehensive GEANT4 simulation package of the SAGE spectrometer has been developed with the ability to simulate the expected datasets based on user input files. The measured performance of the spectrometer is compared to the results obtained from the simulations.

Published
2015

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. Lifetimes of intruder states in 186Pb, 188Pb and 194Po

Author

Paul Greenlees, J. Jolie, Th. Kröll, Peter M. Jones, Paul-Henri Heenen, Mikael Sandzelius, P. Petkov, O. Möller, B. Melon, C. Scholey, Robert Page, Kerttuli Helariutta, Jan Sarén, M. Nyman, C. W. Beausang, Iain Darby, S. Juutinen, Andreas Görgen, P. Maierbeck, Janne Pakarinen, D. A. Meyer, S. Christen, A. Dewald, A.-P. Leppänen, T. Grahn, Michaël Bender, B. Saha, R. Julin, P. Rahkila, Juha Uusitalo, Y. Le Coz, Heikki Kettunen, Paivi Nieminen, Matti Leino, R. Krücken, S. Eeckhaudt, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), 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, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, 21.10.Tg, 23.20.Lv, 27.70.+q, 27.80.+w, quadrupole moment, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, 114Cd(83Kr, 3n), Prolate spheroid, 7. Clean energy, 01 natural sciences, deformation parameters, E=340–375 MeV, Recoil, 108Pd, 106Pd, 0103 physical sciences, Quadrupole, Oblate spheroid, Deformation (engineering), Atomic physics, 010306 general physics, nuclear reactions, Mixing (physics)
Abstract

Lifetimes of prolate intruder states in 186Pb and 188Pb and oblate intruder states in 194Po have been determined through recoil distance Doppler-shift lifetime measurements. Deformation parameters of | β 2 | = 0.29 ( 5 ) and | β 2 | = 0.17(3) have been extracted from experimental B ( E 2 ) values for the prolate and the oblate bands, respectively. The present study addresses the phenomenon of shape coexistence typical for the nuclei near Z = 82 and N = 104 , providing information on configuration mixing of intrinsic structures of the nuclei of interest. The results are compared with the available lifetime data and theoretical results for neutron-deficient Po, Pb, Hg and Pt nuclei. Furthermore, new self-consistent mean-field calculations have been carried out for 194Po.

Published
2008

21. Application of ultra-fast timing techniques to the study of exotic and weakly produced nuclei

Author

J. Uusitalo, J. A. Cameron, Wlodzimierz Klamra, Zs. Podolyák, R. Orlandi, Dirk Rudolph, Bo Cederwall, S. Juutinen, C. Wheldon, Magnus Hellström, P. T. Greenless, Paivi Nieminen, Peter M. Jones, R. Wood, Jörgen Ekman, Philip M Walker, G. S. Simpson, Birger Fogelberg, Alison Bruce, P. Rahkila, K. Lagergren, M. Leino, Janne Pakarinen, Henryk Mach, A.-P. Leppänen, R. Julin, Torbjörn Bäck, M. Stanoiu, 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 Physique Nucléaire d'Orsay (IPNO), 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), 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, Nuclear physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Hardware_INTEGRATEDCIRCUITS, Ultra fast, Statistical physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 7. Clean energy, 01 natural sciences, Selection (genetic algorithm)
Abstract

Ultra-fast time-delayed techniques have been recently applied in a number of studies where exotic nuclei were identified using advanced selection techniques. These include large Compton-suppressed Ge arrays, in-flight separators or recoil separators. Some of the new results are discussed in this presentation. Besides the results for $^{32}$Mg and $^{96}$Pd, they include the first determination of the half-life of the $8^+$ state in $^{80}$Ge, $T_1/2$ = 2.95(6) ns, and significantly more precise results for $^{51}$Mn (3680 keV level) and $^{48}$V (421 keV level), $T_1/2$ = 1760(40) ps and $T_1/2$ $\leq$ 135 ps, respectively. Development of new scintillators will steadily improve precision and sensitivity of future measurements.

Published
2005

22. In-beam and decay spectroscopy of transfermium elements

Author

W. Korten, R. D. Humphreys, N. J. Hammond, K. Hauschild, C. Scholey, M. Rousseau, T. L. Khoo, Pasi Kuusiniemi, F. P. Heßberger, A.-P. Leppänen, R. Julin, P. Reiter, J. Uusitalo, A. Keenan, Paivi Nieminen, Ch. Theisen, T. Grahn, D. G. Jenkins, E. Bouchez, G. D. Jones, M. Leino, Janne Pakarinen, N. Amzal, S. Juutinen, M. Muikku, Peter M. Jones, H. J. Wollersheim, F. Khalfallah, Y. Le Coz, Andreas Görgen, O. Dorvaux, P. Rahkila, Heikki Kettunen, A. Hürstel, Jonathan Wilson, B. J. P. Gall, P. A. Butler, K. Eskola, Paul Greenlees, R-D Herzberg, A. Chatillon, J. E. Bastin, S. Eeckhaudt, H. Kankaanpää, J. Gerl, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), C. Gross, W. Nazarewicz, and K. Rykaczewski

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, media_common.quotation_subject, Nuclear Theory, Library science, 21.10.-k - 23.20.-g - 29.30.-h, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Excellence, 0103 physical sciences, media_common.cataloged_instance, European union, 010306 general physics, Nuclear Experiment, media_common
Abstract

Over the past few years a great deal of new spectroscopic data has been obtained for transfermium nuclei. Recoil separators, coupled with modern target position and focal-plane spectrometers, allow detailed studies of the structure and decay properties of transfermium nuclei to be peformed. In-beam studies using the recoil-gating and recoil-decay tagging techniques mainly provide information on yrast states, whilst complementary focal-plane decay studies give access to non-yrast and isomeric structures. In-beam studies of nuclei in this region have largely been performed at ANL and JYFL, and decay experiments at GSI, JYFL, GANIL and ANL. The present contribution is focussed on recent developments and experiments carried out by a number of collaborating institutes at JYFL.

Published
2004

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