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Title: Status and results from the decay spectroscopy project EURICA (Euroball-RIKEN cluster array)

Abstract

β- and isomer-decay spectroscopy are sensitive probes of nuclear structure, and are often the only techniques capable of providing data for exotic nuclei that are produced with very low rates. Decay properties of exotic nuclei are also essential to model astrophysical events responsible for the evolution of the universe such as the rp- and r-processes. The EURICA project (EUROBALL RIKEN Cluster Array) has been launched in 2012 with the goal of performing spectroscopy of very exotic nuclei. Since 2012, five experimental campaigns have been successfully completed using fragmentation of {sup 124}Xe beam and in-flight-fission of {sup 238}U beam. In these proceedings we will introduce the experimental setup and highlight some key recent results around {sup 78}Ni, {sup 132}Sn, and {sup 110}Zn published during 2014 and 2015.

Authors:
; ; ; ; ;  [1];  [1];  [2];  [1];  [3];  [4];  [5];  [6];  [1];  [2];  [1];  [7];  [7];  [8];  [9] more »; ; ;  [10];  [1];  [11];  [1];  [11]; « less
  1. RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 (Japan)
  2. (United Kingdom)
  3. (China)
  4. Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
  5. (Belgium)
  6. Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano (Italy)
  7. (France)
  8. (RCNP), Osaka University, Ibaraki, Osaka 567-0047 (Japan)
  9. Instituto de Estructura de la Materia, CSIC, E-28006 Madrid (Spain)
  10. GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt (Germany)
  11. (Germany)
Publication Date:
OSTI Identifier:
22608511
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1753; Journal Issue: 1; Conference: Latin American symposium on nuclear physics and applications, Medellin (Colombia), 30 Nov - 4 Dec 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASTROPHYSICS; BEAMS; BETA DECAY; FISSION; FRAGMENTATION; ISOMERS; NICKEL 78; NUCLEAR STRUCTURE; R PROCESS; SPECTROSCOPY; TIN 132; UNIVERSE; URANIUM 238; XENON 124

Citation Formats

Söderström, P.-A., E-mail: pasoder@ribf.riken.jp, Doornenbal, P., Nishimura, S., Baba, H., Isobe, T., Kiss, G., Lorusso, G., National Physical Laboratory, Teddington, Middlesex, TW11 0LW, Wu, J., School of Physics, Peking University, Beijing 100871, Xu, Z. Y., KU Leuven, Instituut voor Kern-en Stralingsfysica, 3001 Leuven, Benzoni, G., Browne, F., School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG, Gey, G., LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble Cedex, ILL, 38042 Grenoble Cedex, Research Center for Nuclear Physics, Jungclaus, A., Kojouharov, I., Kurz, N., Schaffner, H., Lubos, D., Physik Department E12, Technische Universität München, D-85748 Garching, Moschner, K., IKP, University of Cologne, D-50937 Cologne, and and others. Status and results from the decay spectroscopy project EURICA (Euroball-RIKEN cluster array). United States: N. p., 2016. Web. doi:10.1063/1.4955364.
Söderström, P.-A., E-mail: pasoder@ribf.riken.jp, Doornenbal, P., Nishimura, S., Baba, H., Isobe, T., Kiss, G., Lorusso, G., National Physical Laboratory, Teddington, Middlesex, TW11 0LW, Wu, J., School of Physics, Peking University, Beijing 100871, Xu, Z. Y., KU Leuven, Instituut voor Kern-en Stralingsfysica, 3001 Leuven, Benzoni, G., Browne, F., School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG, Gey, G., LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble Cedex, ILL, 38042 Grenoble Cedex, Research Center for Nuclear Physics, Jungclaus, A., Kojouharov, I., Kurz, N., Schaffner, H., Lubos, D., Physik Department E12, Technische Universität München, D-85748 Garching, Moschner, K., IKP, University of Cologne, D-50937 Cologne, & and others. Status and results from the decay spectroscopy project EURICA (Euroball-RIKEN cluster array). United States. doi:10.1063/1.4955364.
Söderström, P.-A., E-mail: pasoder@ribf.riken.jp, Doornenbal, P., Nishimura, S., Baba, H., Isobe, T., Kiss, G., Lorusso, G., National Physical Laboratory, Teddington, Middlesex, TW11 0LW, Wu, J., School of Physics, Peking University, Beijing 100871, Xu, Z. Y., KU Leuven, Instituut voor Kern-en Stralingsfysica, 3001 Leuven, Benzoni, G., Browne, F., School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG, Gey, G., LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble Cedex, ILL, 38042 Grenoble Cedex, Research Center for Nuclear Physics, Jungclaus, A., Kojouharov, I., Kurz, N., Schaffner, H., Lubos, D., Physik Department E12, Technische Universität München, D-85748 Garching, Moschner, K., IKP, University of Cologne, D-50937 Cologne, and and others. 2016. "Status and results from the decay spectroscopy project EURICA (Euroball-RIKEN cluster array)". United States. doi:10.1063/1.4955364.
@article{osti_22608511,
title = {Status and results from the decay spectroscopy project EURICA (Euroball-RIKEN cluster array)},
author = {Söderström, P.-A., E-mail: pasoder@ribf.riken.jp and Doornenbal, P. and Nishimura, S. and Baba, H. and Isobe, T. and Kiss, G. and Lorusso, G. and National Physical Laboratory, Teddington, Middlesex, TW11 0LW and Wu, J. and School of Physics, Peking University, Beijing 100871 and Xu, Z. Y. and KU Leuven, Instituut voor Kern-en Stralingsfysica, 3001 Leuven and Benzoni, G. and Browne, F. and School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG and Gey, G. and LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble Cedex and ILL, 38042 Grenoble Cedex and Research Center for Nuclear Physics and Jungclaus, A. and Kojouharov, I. and Kurz, N. and Schaffner, H. and Lubos, D. and Physik Department E12, Technische Universität München, D-85748 Garching and Moschner, K. and IKP, University of Cologne, D-50937 Cologne and and others},
abstractNote = {β- and isomer-decay spectroscopy are sensitive probes of nuclear structure, and are often the only techniques capable of providing data for exotic nuclei that are produced with very low rates. Decay properties of exotic nuclei are also essential to model astrophysical events responsible for the evolution of the universe such as the rp- and r-processes. The EURICA project (EUROBALL RIKEN Cluster Array) has been launched in 2012 with the goal of performing spectroscopy of very exotic nuclei. Since 2012, five experimental campaigns have been successfully completed using fragmentation of {sup 124}Xe beam and in-flight-fission of {sup 238}U beam. In these proceedings we will introduce the experimental setup and highlight some key recent results around {sup 78}Ni, {sup 132}Sn, and {sup 110}Zn published during 2014 and 2015.},
doi = {10.1063/1.4955364},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1753,
place = {United States},
year = 2016,
month = 7
}
  • The study of nuclear structure at the limits of angular momentum and of the neutrons to protons ratio requires detector systems of unprecedented sensitivity in order to detect the very weak signals characteristic of such regimes. The Euroball {gamma}-ray spectrometer has been built to address the physics of high-spin states and of exotic nuclei lying far from stability. Euroball came into operation in spring 1997 and has been used for more than one year at the Legnaro National Laboratories, Italy. The first results obtained with this powerful instrument are presented in this talk.
  • Programs for studying nuclear reactions and structure of exotic nuclei available at the RIKEN Radioactive Isotope Beam Factory project are introduced and discussed through demonstrating recent highlights. Special emphasis is given to present status and future plans of new devices.
  • The next generation heavy ion accelerator facility, such as the RIKEN radio isotope (RI) beam factory, requires an intense beam of high charged heavy ions. In the past decade, performance of the electron cyclotron resonance (ECR) ion sources has been dramatically improved with increasing the magnetic field and rf frequency to enhance the density and confinement time of plasma. Furthermore, the effects of the key parameters (magnetic field configuration, gas pressure, etc.) on the ECR plasma have been revealed. Such basic studies give us how to optimize the ion source structure. Based on these studies and modern superconducting (SC) technology,more » we successfully constructed the new 28 GHz SC-ECRIS, which has a flexible magnetic field configuration to enlarge the ECR zone and to optimize the field gradient at ECR point. Using it, we investigated the effect of ECR zone size, magnetic field configuration, and biased disk on the beam intensity of the highly charged heavy ions with 18 GHz microwaves. In this article, we present the structure of the ion source and first experimental results with 18 GHz microwave in detail.« less
  • Picosecond lifetimes in {sup 129,130}Ba were determined using the recoil distance technique with a plunger device coupled to an array of EUROBALL-cluster-detectors for the first time. The differential decay curve method in coincidence mode was employed to derive lifetimes for six states in {sup 129}Ba and twelve states in {sup 130}Ba. The resulting B(E2) values are compared with triaxial rotor plus particle calculations for {sup 129}Ba and, in {sup 130}Ba, to the predictions of the general collective model, the interacting boson model, as well as to the symmetric and asymmetric rotor models. In {sup 130}Ba, the transitional quadrupole moment inmore » the ground state band is remarkably constant before and after the backbend. With this data the two-quasiparticle negative parity band in {sup 130}Ba was confirmed to be based on a {pi}(h{sub 11/2}(multiply-in-circle sign)d{sub 5/2}/g{sub 7/2}) configuration. (c) 2000 The American Physical Society.« less
  • CUORE is a 741 kg array of TeO 2 bolometers for the search of neutrinoless double beta decay of 130Te. The detector is being constructed at the Laboratori Nazionali del Gran Sasso, Italy, where it will start taking data in 2015. If the target background of 0.01 counts/(keV·kg·y) will be reached, in five years of data taking CUORE will have a 1σ half life sensitivity of 10 26y. CUORE-0 is a smaller experiment constructed to test and demonstrate the performances expected for CUORE. The detector is a single tower of 52 CUORE-like bolometers that started taking data in spring 2013.more » The status and perspectives of CUORE will be discussed, and the first CUORE-0 data will be presented.« less