Manifestation of the Berry phase in the atomic nucleus 213Pb

J. J. Valiente-Dobón, A. Gottardo, G. Benzoni, A. Gadea, S. Lunardi, A. Algora, G. de Angelis, D. Bazzacco, J. Benlliure, P. Boutachkov, A. Bracco, A. M. Bruce, F. Camera, E. Casarejos, M. L. Cortés, F. C.L. Crespi, A. Corsi, C. Domingo-Pardo, M. Doncel, T. EngertH. Geissel, J. Gerl, A. Goasduff, N. Goel, M. Górska, J. Grebosz, E. Gregor, T. Habermann, S. Klupp, I. Kojouharov, N. Kurz, S. M. Lenzi, S. Leoni, S. Mandal, R. Menegazzo, D. Mengoni, B. Million, A. I. Morales, D. R. Napoli, F. Naqvi, C. Nociforo, M. Pfützner, S. Pietri, Zs Podolyák, A. Prochazka, F. Recchia, P. H. Regan, D. Rudolph, E. Sahin, H. Schaffner, A. Sharma, B. Sitar, D. Siwal, P. Strmen, I. Szarka, C. A. Ur, P. M. Walker, H. Weick, O. Wieland, H. J. Wollersheim, P. Van Isacker

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The neutron-rich 213Pb isotope was produced in the fragmentation of a primary 1 GeV A 238U beam, separated in FRS in mass and atomic number, and then implanted for isomer decay γ-ray spectroscopy with the RISING setup at GSI. A newly observed isomer and its measured decay properties indicate that states in 213Pb are characterized by the seniority quantum number that counts the nucleons not in pairs coupled to angular momentum J=0. The conservation of seniority is a consequence of a geometric phase associated with particle-hole conjugation, which becomes observable in semi-magic nuclei where nucleons half-fill the valence shell. The γ-ray spectroscopic observables in 213Pb are thus found to be driven by two mechanisms, particle-hole conjugation and seniority conservation, which are intertwined through a Berry phase.

    Original languageEnglish
    Article number136183
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume816
    DOIs
    Publication statusPublished - 26 Feb 2021

    Bibliographical note

    Funding Information:
    We thank F. Nowacki for providing the NATHAN and ANTOINE codes. The GSI accelerator staff are acknowledged. The authors acknowledge the support of the Italian Istituto Nazionale di Fisica Nucleare. This work was partially supported by the Ministry of Science, and Generalitat Valenciana, Spain, under the Grants SEV-2014-0398, FPA2017-84756-C4, PROMETEO/2019/005 and by the EU FEDER funds. The support of the UK STFC, of the Swedish Research Council under Contract No. 2008-4240 and No. 2016-3969 and of the DFG (EXC 153) is also acknowledged. The experimental activity has been partially supported by the EU under the FP6-Integrated Infrastructure Initiative EURONS, Contract No. RII3-CT-2004-506065 and FP7-Integrated Infrastructure Initiative ENSAR, Grant No. 262010.

    Funding Information:
    We thank F. Nowacki for providing the NATHAN and ANTOINE codes. The GSI accelerator staff are acknowledged. The authors acknowledge the support of the Italian Istituto Nazionale di Fisica Nucleare . This work was partially supported by the Ministry of Science, and Generalitat Valenciana , Spain, under the Grants SEV-2014-0398 , FPA2017-84756-C4 , PROMETEO/2019/005 and by the EU FEDER funds. The support of the UK STFC , of the Swedish Research Council under Contract No. 2008-4240 and No. 2016-3969 and of the DFG ( EXC 153 ) is also acknowledged. The experimental activity has been partially supported by the EU under the FP6-Integrated Infrastructure Initiative EURONS , Contract No. RII3-CT-2004-506065 and FP7-Integrated Infrastructure Initiative ENSAR , Grant No. 262010 .

    Publisher Copyright:
    © 2021 The Authors

    Copyright:
    Copyright 2021 Elsevier B.V., All rights reserved.

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