- Physical Review Journals
All JournalsPhysics Magazine

Physical Review C

Reuse & Permissions

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4.0 International license. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

Export citation

Export citation

Choose format for download:

Download Citation
  • Letter
  • Open Access

Nature of seniority symmetry breaking in the semimagic nucleus Ru94

B. Das1,*, B. Cederwall1,†, C. Qi1, M. Górska2, P. H. Regan3,4, Ö. Aktas1, H. M. Albers2, A. Banerjee2, M. M. R. Chishti3 et al.

J. Gerl2, N. Hubbard2,5, S. Jazrawi3,4, J. Jolie6, A. K. Mistry2,5, M. Polettini7,8, A. Yaneva2,6, S. Alhomaidhi2,5, J. Zhao2, T. Arici2, S. Bagchi9, G. Benzoni8, P. Boutachkov2, T. Davinson10, T. Dickel2,11, E. Haettner2, O. Hall10, Ch. Hornung2, J. P. Hucka5, P. R. John5, I. Kojouharov2, R. Knöbel2, D. Kostyleva2, N. Kuzminchuk2, I. Mukha2, W. R. Plass2,11, B. S. Nara Singh12, J. Vasiljević1, S. Pietri2, Zs. Podolyák3, M. Rudigier5, H. Rösch5, E. Sahin2,5, H. Schaffner2, C. Scheidenberger2, F. Schirru2, A. Sharma13, R. Shearman4, Y. Tanaka2, J. Vesić14, H. Weick2, H. J. Wollersheim2, U. Ahmed5, A. Algora15,16, C. Appleton10, J. Benito17, A. Blazhev6, A. Bracco7,8, A. M. Bruce18, M. Brunet3, R. Canavan3,4, A. Esmaylzadeh6, L. M. Fraile17, G. Häfner19,6, H. Heggen2, D. Kahl10, V. Karayonchev6, R. Kern5, A. Korgul20, G. Kosir14, N. Kurz2, R. Lozeva19, M. Mikolajczuk20,2, P. Napiralla5, R. Page21, C. M. Petrache19, N. Pietralla5, J.-M. Régis6, P. Ruotsalainen22, L. Sexton10, V. Sanchez-Temble17, M. Si19, J. Vilhena23, V. Werner5, J. Wiederhold5, W. Witt5, P. J. Woods10, and G. Zimba22

  • 1KTH Royal Institute of Technology, 10691 Stockholm, Sweden
  • 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 3Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
  • 4National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom
  • 5Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
  • 6Institut für Kernphysik der Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
  • 7Dipartimento di Fisica, Università degli Studi di Milano, 20133 Milano, Italy
  • 8INFN, Sezione di Milano, 20133 Milano, Italy
  • 9Indian Institute of Technology, Dhanbad 826004, Jharkhand, India
  • 10School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
  • 11Justus Liebig University, 35390 Giessen, Germany
  • 12SUPA, School of Computing, Engineering and Physical Sciences, University of the West of Scotland, PA1 2BE Paisley, United Kingdom
  • 13Department of Physics, Indian Institute of Technology Ropar, Rupnagar-140 001, Punjab, India
  • 14Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
  • 15Instituto de Fisica Corpuscular, CSIC–Universidad de Valencia, E-46071 Valencia, Spain
  • 16Institute for Nuclear Research (ATOMKI), Bem ter 18/c, H-4026 Debrecen, Hungary
  • 17Grupo de Física Nuclear and IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, E-28040 Madrid, Spain
  • 18School of Computing Engineering and Mathematics, University of Brighton, BN2 4AT Brighton, United Kingdom
  • 19Université Paris-Saclay, IJCLab, CNRS/IN2P3, F-91405 Orsay, France
  • 20Faculty of Physics, University of Warsaw, PL 02-093, Warsaw, Poland
  • 21Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 22University of Jyväskylä, Seminaarinkatu 15, 40014 Jyväskylän yliopisto, Finland
  • 23Laboratoire de Physique de la Matiére Condensé et Nanostructures, Université Lyon I, CNRS, UMR 5586, Domaine scientifique de la Doua, F-69622 Villeurbanne Cedex, France

  • *Corresponding author: bdas@kth.se
  • †Corresponding author: bc@kth.se
PDF

Phys. Rev. C 105, L031304 – Published 25 March, 2022

DOI: https://doi.org/10.1103/PhysRevC.105.L031304

Abstract

Direct lifetime measurements via γ−γ coincidences using a fast timing detector array consisting of LaBr3(Ce) scintillators has been applied to determine the lifetime of low-lying states in the semimagic (N=50) nucleus Ru94. The experiment was carried out as the first in a series of “FAIR-0” experiments with the DESPEC experimental setup at the Facility for Antiproton and Ion Research (FAIR). Excited states in Ru94 were populated primarily via the β-delayed proton emission of Pd95 nuclei, produced in the projectile fragmentation of an 850 MeV/nucleon Xe124 beam impinging on a 4 g/cm2Be9 target. While the deduced E2 strength for the 2+→0+ transition in the yrast cascade follows the expected behavior for conserved seniority symmetry, the intermediate 4+→2+ transition exhibits a drastic enhancement of transition strength in comparison with pure-seniority model predictions as well as standard shell model predictions in the fpg proton hole space with respect to doubly magic Sn100. The anomalous behavior is ascribed to a subtle interference between the wave function of the lowest seniority ν=2, Iπ=4+ state and that of a close-lying ν=4 state that exhibits partial dynamic symmetry. In addition, the observed strongly prohibitive 6+→4+ transition can be attributed to the same mechanism but with a destructive interference. It is noted that such effects may provide stringent tests of the nucleon-nucleon interactions employed in state-of-the-art theoretical model calculations.

View figure in article

Physics Subject Headings (PhySH)

Article Text

References (45)

  1. G. Racah, Phys. Rev. 63, 367 (1943).
  2. G. Racah and I. Talmi, Physica 18, 1097 (1952).
  3. C. Schwartz and A. de Shalit, Phys. Rev. 94, 1257 (1954).
  4. A. de Shalit and I. Talmi, Nuclear Shell Theory (Academic, New York, 1963).
  5. I. Talmi, Simple Models of Complex Nuclei (Harwood Academic, Chur, 1993)
  6. P. Ring and P. Schuck, The Nuclear Many Body Problem, 3rd ed. (Springer, Berlin, 2004).
  7. D. H. Gloeckner, M. H. Macfarlane, R. D. Lawson, and F. J. D. Serduke, Phys. Lett. B 40, 597 (1972).
  8. R. Gross and A. Frenkel, Nucl. Phys. A 267, 85 (1976).
  9. R. D. Lawson, Z. Phys. A 303, 51 (1981).
  10. J. Blomqvist and L. Rydström, Phys. Scr. 31, 31 (1985).
  11. E. Caurier, M. Rejmund, and H. Grawe, Phys. Rev. C 67, 054310 (2003).
  12. L. Coraggio et al., J. Phys. G: Nucl. Part. Phys. 26, 1697 (2000).
  13. R. F. Casten, Nuclear Structure from a Simple Perspective (Oxford University Press, Oxford, 2000).
  14. J. J. Ressler, R. F. Casten, N. V. Zamfir, C. W. Beausang, R. B. Cakirli, H. Ai, H. Amro, M. A. Caprio, A. A. Hecht, A. Heinz, S. D. Langdown, E. A. McCutchan, D. A. Meyer, C. Plettner, P. H. Regan, M. J. S. Sciacchitano, and A. D. Yamamoto, Phys. Rev. C 69, 034317 (2004)
  15. L. D. Landau, Physik. Z. Sowjet. 2, 46 (1932); L. D. Landau and E. M. Lifshitz, Quantum Mechanics: Non-relativistic theory, 3rd ed. (Pergamon, New York, 1977), pp. 342–351.
  16. C. Zener, Proc. R. Soc. London A 137, 696 (1932)
  17. A. Escuderos and L. Zamick, Phys. Rev. C 73, 044302 (2006).
  18. P. Van Isacker and S. Heinze, Phys. Rev. Lett. 100, 052501 (2008).
  19. P. Van Isacker, Int. J. Mod. Phys. E 22, 1330028 (2013).
  20. H. Mach, A. Korgul, M. Gorska, H. Grawe, I. Matea, M. Stanoiu, L. M. Fraile, Y. E. Penionzkevich, F. D. Santos, D. Verney, S. Lukyanov, B. Cederwall, A. Covello, Z. Dlouhy, B. Fogelberg, G. DeFrance, A. Gargano, G. Georgiev, R. Grzywacz, A. F. Lisetskiy et al. Phys. Rev. C 95, 014313 (2017).
  21. C. Qi, Phys. Rev. C 83, 014307 (2011).
  22. C. Qi, Phys. Lett. B 773, 616 (2017).
  23. Y. Qian and C. Qi, Phys. Rev. C 98, 061303(R) (2018)
  24. A. I. Morales et al., Phys. Lett. B 781, 706 (2018).
  25. B. Cederwall et al., Nature (London) 469, 68 (2011).
  26. S. Zerguine and P. Van Isacker, Phys. Rev. C 83, 064314 (2011).
  27. H. Geissel et al., Nucl. Instrum. Methods Phys. Res., Sect. B 70, 286 (1992).
  28. A. B. Garnsworthy et al., Phys. Rev. C 80, 064303 (2009).
  29. C. J. Griffin et al., JPS Conf. Proc. 14, 020622 (2017).
  30. B. Rubio, Int. J. Mod. Phys. E 15, 1979 (2006).
  31. M. Polettini et al., IL Nuovo Cimento 44C, 67 (2021).
  32. M. Rudigier et al., Nucl. Instrum. Methods Phys. Res., Sect. A 969, 163967 (2020).
  33. J. Serrano et al., in ICALEPCS 2009, Proceedings of the International Conference on Accelerator and Large Experimental Physics Control Systems, Kobe, Japan, 2009 (ICALEPCS, Barcelona, 2009).
  34. E. Nolte and H. Hick, Phys. Lett. B 97, 55 (1980).
  35. W. Kurcewicz, E. F. Zganjar, R. Kirchner, O. Klepper, E. Roeckl, P. Komninos, E. Nolte, D. Schardt, and P. Tidemand-Petersson, Z. Phys. A 308, 21 (1982).
  36. H. A. Roth et al., Phys. Rev. C 50, 1330 (1994).
  37. J.-M. Régis, G. Pascovici, J. Jolie, and M. Rudigier, Nucl. Instrum. Methods Phys. Res., Sect. A 622, 83 (2010).
  38. J.-M. Régis et al., Nucl. Instrum. Methods Phys. Res., Sect. A 726, 191 (2013).
  39. S. Ansari, J. M. Regis, J. Jolie, N. Saed-Samii, N. Warr, W. Korten, M. Zielinska, M. D. Salsac, A. Blanc, M. Jentschel, U. Koster, P. Mutti, T. Soldner, G. S. Simpson, F. Drouet, A. Vancraeyenest, G. deFrance, E. Clement, O. Stezowski, C. A. Ur, W. Urban et al. Phys. Rev. C 96, 054323 (2017).
  40. E. R. Gamba, A. M. Bruce, and M. Rudigier, Nucl. Instrum. Methods Phys. Res., Sect. A 928, 93 (2019).
  41. O. Häusser, I. S. Towner, T. Faestermann, H. R. Andrews, J. R. Beene, D. Horn, and D. Ward, Nucl. Phys. A 293, 248 (1977).
  42. J.-M. Régis et al., Nucl. Instrum. Methods Phys. Res., Sect. A 763, 210 (2014).
  43. J.-M. Régis, J. Jolie, N. Saed-Samii, N. Warr, M. Pfeiffer, A. Blanc, M. Jentschel, U. Koster, P. Mutti, T. Soldner, G. S. Simpson, F. Drouet, A. Vancraeyenest, G. deFrance, E. Clement, O. Stezowski, C. A. Ur, W. Urban, P. H. Regan, Z. Podolyak, C. Larijani et al. Phys. Rev. C 95, 054319 (2017).
  44. M. Honma, T. Otsuka, T. Mizusaki, and M. Hjorth-Jensen, Phys. Rev. C 80, 064323 (2009).
  45. C. M. Lederer, J. M. Jaklevic, and J. M. Hollander, Nucl. Phys. A 169, 449 (1971).

Outline

Information

Phys. Rev. C 105, L031304– Published 25 March, 2022
  • Received 17 October 2021
  • Revised 17 January 2022
  • Accepted 11 March 2022
Crossmark - Check for updates button
Creative Commons Logo

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.

Published by the American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation