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[RIBF-ULIC-Symposium-007] E(U)RICA International Workshop

23–24 May 2011
RIKEN Nishina Center
Asia/Tokyo timezone

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Contribution List

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  1. 19. Opening
    Hideyuki Sakai
    23/05/2011, 10:00
  2. 20. Overview of the RIBF
    Hiroyoshi Sakurai (RIKEN Nishina Center for Accelerator-Based Science)
    23/05/2011, 10:10
  3. 21. Overview of the BigRIPS fragment separator
    Toshiyuki Kubo (RIKEN Nishina Center)
    23/05/2011, 10:30
  4. 23. E(U)RICA introduction
    Pieter Doornenbal (RIKEN), Shunji Nishimura (Researcher)
    23/05/2011, 10:50
  5. 14. First results of beta-gamma spectroscopy for neutron-rich nuclei around A=110 at RIBF
    Kenta Yoshinaga (Tokyo University of Science)
    23/05/2011, 11:10
    A drastic shape evolution is predicted in neutron-rich nuclei around A=110 [1]. For the Zr isotopes, a deformation may reach a maximum by a deformed shell-closure. Energies of low-lying states which are known up to N=64 show the increase of the deformation from N=60 to 64. However, the maximization of the deformation has not been observed as a function of neutron numbers. Furthermore, a...
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  6. 24. Spectroscopy of the doubly magic nucleus 100Sn and its neighbourhood with RISING
    Christoph Hinke (Physik Department E12 TU Muenchen, Germany)
    23/05/2011, 11:35
    The investigation of the shell structure far from the valley of stability is a major task in modern nuclear structure physics, especially close to the drip lines. By fragmentation of a 1.0 A GeV 124Xe beam from the GSI accelerators 100Sn and neighbouring nuclei have been produced, separated in the FRS and identified by multiple deltaE, Brho and ToF measurements. The nuclei were stopped in an...
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  7. 25. Decay Spectroscopy in Proton-Rich Nuclei
    Shunji Nishimura (Researcher)
    23/05/2011, 13:30
  8. 31. Beta Decay Studies Near N=28
    Zhihuan Li (RIKEN)
    23/05/2011, 13:50
    The nuclear structure in the region of nuclei around N=28 depends strongly on the filling of both proton and neutron orbitals. In the present proposed experiment, we plan to make systematic study the low lying energy levels for those nuclei as well as the following daughter nuclei via the b-decay and lifetime measurements. We observe the b rays using plastic scintillators. The b-delayed g rays...
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  9. 18. Studies of the Beta Decays of very neutron-deficient nuclei and a comparison with Charge Exchange reactions.
    Berta Rubio (CSIC Valencia)
    23/05/2011, 14:10
    Studies of the Tz = -1 → 0 beta decays of 42Ti, 46Cr, 50Fe and 54Ni to the self-conjugate nuclei 42Sc, 46V, 50Mn, and 54Co respectively (P.h.D Thesis,Francisco Molina- Univ. Valencia) will be presented. The nuclei of interest were produced in the fragmentation of a 58Ni beam of 680 MeV/nucleon at GSI. The ions were separated using the Fragment Recoil Separator (FRS) and implanted into a set of...
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  10. 8. Study of the N=34 subshell gap (and abstract Ids 12,13,16)
    Jose Javier Valiente Dobon (LNL-INFN)
    23/05/2011, 14:30
    Shell closures are a fundamental concept in nuclear physics and most of our knowledge of effective nucleon-nucleon interactions comes from the study of nuclei with few valence particles around doubly-magic cores. There are by now a wealth of data coming from the study of exotic nuclei showing that the relative energies of the shell-model orbitals are not immutable but can change and evolve...
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  11. 29. Study of mid-shell nuclei based on the beta-gamma spectroscopy method
    Atsuko Odahara (Department of Physics, Osaka University)
    23/05/2011, 15:10
  12. 4. Study of the N=50 major shell effect towards 78Ni : contribution from beta-decay studies at IPN Orsay
    David Verney (Institut de Physique Nucleaire - IN2P3-CNRS / University Paris Sud-11)
    23/05/2011, 16:00
    The PARRNe ISOL device has been operating at IPN Orsay since 10 years. Originally conceived as a test bench for R&D studies in the framework of SPIRAL2, the performance of the setup has proven suitable to undertake a physics research program on the evolution of N=50 towards 78Ni by beta-decay studies. During the past decade, several experiments were realized using either the Tandem as a...
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  13. 9. Decay Spectroscopy in the vicinity of 78Ni
    Shunji Nishimura (Researcher)
    23/05/2011, 16:20
    Study of doubly-closed-shell and neighboring nuclei provides great opportunities for testing of nuclear models and expanding our knowledge of nucleosynthesis processes. Especially, the region around 78Ni (Z=28, N=50) has attracted great interests because of its extreme neutron-to-proton ratio in the region far from the valley of stability. Despite of a great deal of theoretical activity...
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  14. 10. Spectroscopy of neutron-rich nuclei around 110Zr
    Toshiyuki Sumikama (Tokyo University of Science)
    23/05/2011, 16:40
    Shape evolution around 110Zr attracts much attention because shape transition from prolate to oblate, spherical or more exotic tetrahedral shapes has been predicted by many authors. 110Zr is expected to be a spherical shape due to a possible subshell closure at N=70 [1]. Furthermore, the transition to an oblate shape may appear in more neutron-rich region [2]. We performed the experiment...
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  15. 6. b-decay spectroscopy study of neutron rich nuclei around the N=82 shell closure including the r-process waiting points 128Pd
    Giuseppe Lorusso (RIKEN)
    23/05/2011, 17:00
    The b-decay study of the region around the N=82 shell closure is critical for r-process models. The experiment that we intend to perform with the addition of the EURICA spectrometer aims to study the decay of the N=82 nuclei 128Pd and 129Ag that are expected to be waiting points for the the r-process in most r-process models, and therefore their study will dramatically improve the reliability...
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  16. 30. Beta decay of the neutron-rich 132,134Cd isotopes and search for 6+ isomers in 136,138Sn
    Pieter Doornenbal (RIKEN)
    23/05/2011, 17:20
  17. 34. Probing neutron-rich isotopes around doubly closed-shell 132Sn and doubly mid-shell 170Dy by combined beta-gamma and isomer spectroscopy
    Hiroshi Watanabe (RIKEN Nishina Center)
    23/05/2011, 17:40
    I will present possible decay spectroscopy experiments using the E(U)RICA array at RIBF, aiming at studying neutron-rich nuclei in the vicinity of the doubly magic nucleus 132Sn and the doubly mid-shell nucleus 170Dy
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  18. 22. Achievements of the RISING Fast Beam Campaign
    Hans-Jürgen Wollersheim (GSI Helmholtzzentrum)
    24/05/2011, 10:00
  19. 3. Scientific Achievements of the Stopped Beam RISING Campaign at GSI
    Patrick Regan (University of Surrey)
    24/05/2011, 10:35
    Some of the science highlights for the Stopped Beam RISING experimental campaigns at GSI will be reviewed using both passive and active stopping materials. These include isomer and beta-decay studies along the N=Z line from 56Ni up to 100Sn; isomer spectroscopy of shell-model configurations around the doubly magic systems 132Sn and 208Pb; and the use of beta-delayed gamma-ray spectroscopy for...
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  20. 15. Achievements with g-RISING
    Radomira Lozeva (IPHC, CNRS, IN2P3)
    24/05/2011, 11:10
    Within the RISING collaboration a g-factor campaign has been performed on magnetic moment measurements of isomeric states in neutron-rich Sn isotopes and in the neutron-deficient Pb-region. For the first time the experimental technique has been successfully applied at relativistic energies for radioactive isotopes produced by 238U fission and 136Xe fragmentation on 9Be targets and traversing...
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  21. 7. g-factor measurements for highly spin-aligned isomeric states
    Yuichi Ichikawa (RIKEN Nishina Center)
    24/05/2011, 11:45
    The nuclear spin alignment in an excited state results in anisotropy of angular distribution in Gamma-ray emission, which provides us a chance to measure nuclear observables through various spectroscopic techniques. Especially the time-differential perturbed angular distribution (TDPAD) method is one of the major techniques to determine a g-factor of an isomeric state with a lifetime of ns -...
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  22. 32. In-Beam Gamma-ray Spectroscopy at the RIBF
    Nori Aoi (RIKEN Nishina Center)
    24/05/2011, 13:30
  23. 17. Gamma spectroscopy and B(E2) measurements to study shape transitions in neutron rich Mo and Tc isotopes
    Eiji Ideguchi (CNS, University of Tokyo)
    24/05/2011, 14:05
    We plan to perform an experiment at the BigRIPS fragment separator at RIKEN to study prolate-oblate shape transitions in neutron rich Mo and Tc nuclides. Existing mean field calculations predict dramatic changes in the ground-state shape in this part of the nuclide chart. To test the validity of the theoretical model framework in the regime, new experimental data in the form of energies of...
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  24. 11. Development of Energy-degraded RI beams at RIBF
    Toshiyuki Sumikama (Tokyo University of Science)
    24/05/2011, 14:25
    Low-energy nuclear reactions such as fusion-evaporation, multi-step Coulomb excitation, transfer reactions, etc. are important probes to investigate exotic structure of unstable nuclei. While RIBF provides world's most intense RI beams, an energy of about 250 MeV/A is much higher than required energies for low-energy reactions. At the last NP-PAC meeting, we proposed the development of...
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  25. 26. Thoughts on the E(U)RICA DAQ
    Hidetada Baba (RIKEN)
    24/05/2011, 14:40
  26. 28. Discussions
    Pieter Doornenbal (RIKEN), Shunji Nishimura (Researcher)
    24/05/2011, 15:30
  27. 27. Closing remarks
    Shunji Nishimura (Researcher)
    24/05/2011, 17:00
  28. 13. Decay Spectroscopy of 110Zr
    Dr Javier Valiente Dobon (INFN Laboratori Nazionali di Legnaro)
    Several theoretical studies based on the concept of the mean field, Woods-Saxon, Strutinsky and Hartree-Fock have predicted tetrahedral symmetry in nuclei. Tetrahedral symmetry leads to a tetrahedron shape which would be the most symmetric shape in nuclei to be discovered. Although some evidences for such structures have been found no conclusive proof has yet been provided for their existence....
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  29. 12. Mirror energy and transition strength differences beyond the fp shell. Isomeric decay of 71Kr – 71Br
    Dr Javier Valiente Dobon (INFN Laboratori Nazionali di Legnaro)
    Isospin formalism, which describes the neutron and the proton as two states of the same particle, the nucleon, is amongst the essential descriptive tools of a vast range of nuclear phenomena. The broad success of the isospin symmetry concept belies its broken nature. Not only is the symmetry broken by the proton-neutron mass difference and the Coulomb interaction, but also by the...
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  30. 16. Shell structure around 78Ni : Beta-decay studies of neutron-rich 77Cu
    Jose Javier Valiente Dobon (INFN-LNL)
    The magic numbers, originated by the large shell gaps in the energy spectrum of the single-particle states, represent a fundamental quantity governing nuclear structure. They can be reproduced using a single-particle harmonic oscillator potential with a strong spin-ortbit interaction and they are predicted to change for large N/Z ratios. Exotic nuclei close to the shell closures on the neutron...
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