First Exploration of Monopole-Driven Shell Evolution above the N = 126 shell closure : new Millisecond Isomers in 213Tl and 215Tl
Yeung, T. T., Morales, A. I., Wu, J., Liu, M., Yuan, C., Nishimura, S., Phong, V. H., Fukuda, N., Tain, J. L., Davinson, T., Rykaczewski, K. P., Yokoyama, R., Isobe, T., Niikura, M., Podolyák, Zs., Alcalá, G., Algora, A., Allmond, J. M., Agramunt, J., . . . Yap, J. M. (2024). First Exploration of Monopole-Driven Shell Evolution above the N = 126 shell closure : new Millisecond Isomers in 213Tl and 215Tl. Physical Review Letters, 133(7), Article 072501. https://doi.org/10.1103/PhysRevLett.133.072501
Julkaistu sarjassa
Physical Review LettersPäivämäärä
2024Tekijänoikeudet
© 2024 American Physical Society
Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closed shell has been performed for the first time at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. New millisecond isomers have been identified at low excitation energies, 985.3(19) keV in 213Tl and 874(5) keV in 215Tl. The measured half-lives of 1.34(5) ms in 213Tl and 3.0(3) ms in 215Tl suggest spins and parities 11/2- with the single proton-hole configuration h11/2 as leading component. They are populated via E1 transitions by the decay of higher-lying isomeric states with proposed spin and parity 17/2+, interpreted as arising from a single s1/2 proton hole coupled to the 8+ seniority isomer in the (A+1)Pb cores. The lowering of the 11/2- states is ascribed to an increase of the h11/2 proton effective single-particle energy as the second g9/2 orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the h11/2 and g9/2 orbitals. The new ms-isomers provide the first experimental observation of shell evolution in the almost unexplored N>126 nuclear region below doubly-magic 208Pb.
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American Physical SocietyISSN Hae Julkaisufoorumista
0031-9007Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/233563911
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We acknowledge the RI Beam Factory, operated by the RIKEN Nishina Center and CNS, University of Tokyo, for providing successful means to perform the experiment. Support of RIKEN RiNA-NET and JSPS KAKENHI (Grants No. 14F04808, No. 17H06090, No. 25247045, 20H05648, 22H04946, and No. 19340074), Spanish Ministerio de Economia y Competitividad, Ministerio de Ciencia, Innovación y Universidades (FPA2011-06419, FPA2011-28770-C03-03, FPA2014-52823-C2-1-P, FPA2014-52823-C2-2-P, SEV-2014-0398, FPA2017-83946-C2-1-P, FPA2017-83946-C2-2-P, PID2019–104714 GB-C21, PID2019–104714 GB-C22, CNS2023-144871), and Generalitat Valenciana, Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital (CISEJI/2022/25, PROMETEO/2019/007, CIPROM/2022/9) is acknowledged. This research was sponsored by the Office of Nuclear Physics, U.S. Department of Energy under Awards No. DE-AC02-98CH10886 (BNL) and No. DE-AC02-06CH11357 (ANL), by the U.S. Department of Energy (DOE), Office of Science, Office of Nuclear Physics, under Grant No. DE-SC0020451, the Office of Nuclear Physics, U.S. Department of Energy under Award No. DE-FG02-96ER40983 (UTK) and DE-AC05-00OR22725 (ORNL), and by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Award No. DE-NA0002132, the National Science Foundation under Grants No. PHY-1430152 (JINA Center for the Evolution of the Elements), No. PHY-1565546 (NSCL), and No. PHY-1714153 (Central Michigan University), by Guangdong Major Project of Basic and Applied Basic Research under Grant No. 2021B0301030006, by the UK Science and Technology Facilities Council, by NKFIH (NN128072 and K147010), by European Commission FP7/EURATOM Contract No. 605203, by the UK Science and Technology Facilities Council Grant No. ST/N00244X/1, ST//P004598/1, and ST/V001027/1, by the National Research Foundation (NRF) in South Korea (No. 2016K1A3A7A09005575, No. 2015H1A2A1030275) and by the Natural Sciences and Engineering Research Council of Canada (NSERC) via the Discovery Grant No. SAPIN-2019-00030. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. T. T. Y. acknowledges support from Grant-in-Aid for JSPS Fellows Grants No. 23KJ0727; Forefront Physics and Mathematics Program to Drive Transformation (FoPM), a World-leading Innovative Graduate Study (WINGS) Program, the University of Tokyo; JSR Fellowship, JSR-UTokyo Collaboration Hub, CURIE; Teijin Kumura Scholarship, Teijin Scholarship Foundation; and Monbukagakusho Honors Scholarship, Japan Student Services Organization. R. Y. acknowledges support from JSPS KAKENHI 22K14053. A. A. acknowledges partial support of the JSPS Invitational Fellowships for Research in Japan (ID: L1955). J. P. acknowledges support by the Institute for Basic Science (IBS-R031-D1). ...Lisenssi
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