First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in Tl 213 and Tl 215

T. T. Yeung; A. I. Morales; J. Wu; M. Liu; C. Yuan; S. Nishimura; V. H. Phong; N. Fukuda; J. L. Tain; T. Davinson; K. P. Rykaczewski; R. Yokoyama; T. Isobe; M. Niikura; Zs Podolyák; G. Alcalá; A. Algora; J. M. Allmond; J. Agramunt; C. Appleton; H. Baba; R. Caballero-Folch; F. Calvino; M. P. Carpenter; I. Dillmann; A. Estrade; T. Gao; C. J. Griffin; R. K. Grzywacz; O. Hall; Y. Hirayama; B. M. Hue; E. Ideguchi; G. G. Kiss; K. Kokubun; F. G. Kondev; R. Mizuno; M. Mukai; N. Nepal; M. N. Nurhafiza; S. Ohta; S. E.A. Orrigo; M. Pallàs; J. Park; B. C. Rasco; D. Rodríguez-García; H. Sakurai; L. Sexton; Y. Shimizu; H. Suzuki; A. Vitéz-Sveiczer; H. Takeda; A. Tarifeno-Saldivia; A. Tolosa-Delgado; J. A. Victoria; Y. X. Watanabe; J. M. Yap

doi:10.1103/PhysRevLett.133.072501

First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in Tl 213 and Tl 215

T. T. Yeung, A. I. Morales, J. Wu, M. Liu, C. Yuan, S. Nishimura, V. H. Phong, N. Fukuda, J. L. Tain, T. Davinson, K. P. Rykaczewski, R. Yokoyama, T. Isobe, M. Niikura, Zs Podolyák, G. Alcalá, A. Algora, J. M. Allmond, J. Agramunt, C. AppletonH. Baba, R. Caballero-Folch, F. Calvino, M. P. Carpenter, I. Dillmann, A. Estrade, T. Gao, C. J. Griffin, R. K. Grzywacz, O. Hall, Y. Hirayama, B. M. Hue, E. Ideguchi, G. G. Kiss, K. Kokubun, F. G. Kondev, R. Mizuno, M. Mukai, N. Nepal, M. N. Nurhafiza, S. Ohta, S. E.A. Orrigo, M. Pallàs, J. Park, B. C. Rasco, D. Rodríguez-García, H. Sakurai, L. Sexton, Y. Shimizu, H. Suzuki, A. Vitéz-Sveiczer, H. Takeda, A. Tarifeno-Saldivia, A. Tolosa-Delgado, J. A. Victoria, Y. X. Watanabe, J. M. Yap

Nuclear Structure and Nuclear Astrophysi

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

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 Tl213 and 874(5) keV in Tl215. The measured half-lives of 1.34(5) ms in Tl213 and 3.0(3) ms in Tl215 suggest spins and parities 11/2- with the single proton-hole configuration πh11/2 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 πs1/2 proton hole coupled to the 8+ seniority isomer in the PbA+1 cores. The lowering of the 11/2- states is ascribed to an increase of the πh11/2 proton effective single-particle energy as the second νg9/2 orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the πh11/2 and νg9/2 orbitals. The new ms isomers provide the first experimental observation of shell evolution in the almost unexplored N>126 nuclear region below doubly magic Pb208.

Original language	English
Article number	072501
Journal	Physical Review Letters
Volume	133
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.133.072501
State	Published - Aug 16 2024

Funding

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, Innovaci\u00F3n 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\u2013104714 GB-C21, PID2019\u2013104714 GB-C22, CNS2023-144871), and Generalitat Valenciana, Conselleria de Innovaci\u00F3n, 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.\u2009T.\u2009Y. 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.\u2009Y. acknowledges support from JSPS KAKENHI 22K14053. A.\u2009A. acknowledges partial support of the JSPS Invitational Fellowships for Research in Japan (ID: L1955). J.\u2009P. acknowledges support by the Institute for Basic Science (IBS-R031-D1). 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, Innovacien 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 Innovacien, 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).

Funders	Funder number
Teijin Kumura Scholarship
Science and Technology Facilities Council
JSR
Forefront Physics and Mathematics Program
Oak Ridge National Laboratory
Conselleria de Innovacien, Universidades, Ciencia y Sociedad Digital
Ministerio de Economía y Competitividad
JSR-UTokyo Collaboration Hub
European Commission
Argonne National Laboratory
Central Michigan University
RIKEN
Generalitat Valenciana
CURIE
Nuclear Physics
National Research Council Canada
University of Tokyo
U.S. Department of Energy	DE-AC02-98CH10886, DE-AC02-06CH11357
U.S. Department of Energy
NSCL	PHY-1714153
Teijin Scholarship Foundation	L1955, 22K14053
National Science Foundation	PHY-1430152, PHY-1565546
National Science Foundation
Ministerio de Ciencia, Innovación y Universidades	PID2019–104714 GB-C21, PID2019–104714 GB-C22, CNS2023-144871, FPA2011-28770-C03-03, FPA2011-06419, FPA2014-52823-C2-1-P, SEV-2014-0398, FPA2017-83946-C2-1-P, FPA2014-52823-C2-2-P, FPA2017-83946-C2-2-P
Ministerio de Ciencia, Innovación y Universidades
Institute for Basic Science	IBS-R031-D1
Institute for Basic Science
Guangdong Major Project of Basic and Applied Basic Research	2021B0301030006
National Research Foundation of Korea	2015H1A2A1030275, 2016K1A3A7A09005575
National Research Foundation of Korea
H2020 Euratom	ST//P004598/1, ST/V001027/1, 605203, ST/N00244X/1
H2020 Euratom
Japan Society for the Promotion of Science	19340074, 25247045, 22H04946, 14F04808, 17H06090, 20H05648
Japan Society for the Promotion of Science
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal	K147010, NN128072
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal
Natural Sciences and Engineering Research Council of Canada	23KJ0727, SAPIN-2019-00030
Natural Sciences and Engineering Research Council of Canada
National Nuclear Security Administration	DE-NA0002132
National Nuclear Security Administration
Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital	PROMETEO/2019/007, CIPROM/2022/9, CISEJI/2022/25
Office of Science	DE-SC0020451, DE-AC05-00OR22725, DE-FG02-96ER40983
Office of Science

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10.1103/PhysRevLett.133.072501

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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, Z., 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 Tl 213 and Tl 215. Physical Review Letters, 133(7), Article 072501. https://doi.org/10.1103/PhysRevLett.133.072501

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title = "First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in Tl 213 and Tl 215",

abstract = "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 Tl213 and 874(5) keV in Tl215. The measured half-lives of 1.34(5) ms in Tl213 and 3.0(3) ms in Tl215 suggest spins and parities 11/2- with the single proton-hole configuration πh11/2 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 πs1/2 proton hole coupled to the 8+ seniority isomer in the PbA+1 cores. The lowering of the 11/2- states is ascribed to an increase of the πh11/2 proton effective single-particle energy as the second νg9/2 orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the πh11/2 and νg9/2 orbitals. The new ms isomers provide the first experimental observation of shell evolution in the almost unexplored N>126 nuclear region below doubly magic Pb208.",

author = "Yeung, {T. T.} and Morales, {A. I.} and J. Wu and M. Liu and C. Yuan and S. Nishimura and Phong, {V. H.} and N. Fukuda and Tain, {J. L.} and T. Davinson and Rykaczewski, {K. P.} and R. Yokoyama and T. Isobe and M. Niikura and Zs Podoly{\'a}k and G. Alcal{\'a} and A. Algora and Allmond, {J. M.} and J. Agramunt and C. Appleton and H. Baba and R. Caballero-Folch and F. Calvino and Carpenter, {M. P.} and I. Dillmann and A. Estrade and T. Gao and Griffin, {C. J.} and Grzywacz, {R. K.} and O. Hall and Y. Hirayama and Hue, {B. M.} and E. Ideguchi and Kiss, {G. G.} and K. Kokubun and Kondev, {F. G.} and R. Mizuno and M. Mukai and N. Nepal and Nurhafiza, {M. N.} and S. Ohta and Orrigo, {S. E.A.} and M. Pall{\`a}s and J. Park and Rasco, {B. C.} and D. Rodr{\'i}guez-Garc{\'i}a and H. Sakurai and L. Sexton and Y. Shimizu and H. Suzuki and A. Vit{\'e}z-Sveiczer and H. Takeda and A. Tarifeno-Saldivia and A. Tolosa-Delgado and Victoria, {J. A.} and Watanabe, {Y. X.} and Yap, {J. M.}",

note = "Publisher Copyright: {\textcopyright} 2024 American Physical Society.",

year = "2024",

month = aug,

day = "16",

doi = "10.1103/PhysRevLett.133.072501",

language = "English",

volume = "133",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "7",

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Yeung, TT, Morales, AI, Wu, J, Liu, M, Yuan, C, Nishimura, S, Phong, VH, Fukuda, N, Tain, JL, Davinson, T, Rykaczewski, KP, Yokoyama, R, Isobe, T, Niikura, M, Podolyák, Z, Alcalá, G, Algora, A, Allmond, JM, Agramunt, J, Appleton, C, Baba, H, Caballero-Folch, R, Calvino, F, Carpenter, MP, Dillmann, I, Estrade, A, Gao, T, Griffin, CJ, Grzywacz, RK, Hall, O, Hirayama, Y, Hue, BM, Ideguchi, E, Kiss, GG, Kokubun, K, Kondev, FG, Mizuno, R, Mukai, M, Nepal, N, Nurhafiza, MN, Ohta, S, Orrigo, SEA, Pallàs, M, Park, J, Rasco, BC, Rodríguez-García, D, Sakurai, H, Sexton, L, Shimizu, Y, Suzuki, H, Vitéz-Sveiczer, A, Takeda, H, Tarifeno-Saldivia, A, Tolosa-Delgado, A, Victoria, JA, Watanabe, YX & Yap, JM 2024, 'First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in Tl 213 and Tl 215', Physical Review Letters, vol. 133, no. 7, 072501. https://doi.org/10.1103/PhysRevLett.133.072501

TY - JOUR

T1 - First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure

T2 - New Millisecond Isomers in Tl 213 and Tl 215

AU - Yeung, T. T.

AU - Morales, A. I.

AU - Wu, J.

AU - Liu, M.

AU - Yuan, C.

AU - Nishimura, S.

AU - Phong, V. H.

AU - Fukuda, N.

AU - Tain, J. L.

AU - Davinson, T.

AU - Rykaczewski, K. P.

AU - Yokoyama, R.

AU - Isobe, T.

AU - Niikura, M.

AU - Podolyák, Zs

AU - Alcalá, G.

AU - Algora, A.

AU - Allmond, J. M.

AU - Agramunt, J.

AU - Appleton, C.

AU - Baba, H.

AU - Caballero-Folch, R.

AU - Calvino, F.

AU - Carpenter, M. P.

AU - Dillmann, I.

AU - Estrade, A.

AU - Gao, T.

AU - Griffin, C. J.

AU - Grzywacz, R. K.

AU - Hall, O.

AU - Hirayama, Y.

AU - Hue, B. M.

AU - Ideguchi, E.

AU - Kiss, G. G.

AU - Kokubun, K.

AU - Kondev, F. G.

AU - Mizuno, R.

AU - Mukai, M.

AU - Nepal, N.

AU - Nurhafiza, M. N.

AU - Ohta, S.

AU - Orrigo, S. E.A.

AU - Pallàs, M.

AU - Park, J.

AU - Rasco, B. C.

AU - Rodríguez-García, D.

AU - Sakurai, H.

AU - Sexton, L.

AU - Shimizu, Y.

AU - Suzuki, H.

AU - Vitéz-Sveiczer, A.

AU - Takeda, H.

AU - Tarifeno-Saldivia, A.

AU - Tolosa-Delgado, A.

AU - Victoria, J. A.

AU - Watanabe, Y. X.

AU - Yap, J. M.

PY - 2024/8/16

Y1 - 2024/8/16

N2 - 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 Tl213 and 874(5) keV in Tl215. The measured half-lives of 1.34(5) ms in Tl213 and 3.0(3) ms in Tl215 suggest spins and parities 11/2- with the single proton-hole configuration πh11/2 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 πs1/2 proton hole coupled to the 8+ seniority isomer in the PbA+1 cores. The lowering of the 11/2- states is ascribed to an increase of the πh11/2 proton effective single-particle energy as the second νg9/2 orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the πh11/2 and νg9/2 orbitals. The new ms isomers provide the first experimental observation of shell evolution in the almost unexplored N>126 nuclear region below doubly magic Pb208.

AB - 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 Tl213 and 874(5) keV in Tl215. The measured half-lives of 1.34(5) ms in Tl213 and 3.0(3) ms in Tl215 suggest spins and parities 11/2- with the single proton-hole configuration πh11/2 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 πs1/2 proton hole coupled to the 8+ seniority isomer in the PbA+1 cores. The lowering of the 11/2- states is ascribed to an increase of the πh11/2 proton effective single-particle energy as the second νg9/2 orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the πh11/2 and νg9/2 orbitals. The new ms isomers provide the first experimental observation of shell evolution in the almost unexplored N>126 nuclear region below doubly magic Pb208.

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U2 - 10.1103/PhysRevLett.133.072501

DO - 10.1103/PhysRevLett.133.072501

M3 - Article

AN - SCOPUS:85201281453

SN - 0031-9007

VL - 133

JO - Physical Review Letters

JF - Physical Review Letters

IS - 7

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ER -

First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in Tl 213 and Tl 215

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