Deformation and Collectivity in Doubly Magic Pb 208

J. Henderson; J. Heery; M. Rocchini; M. Siciliano; N. Sensharma; A. D. Ayangeakaa; R. V. F. Janssens; T. M. Kowalewski; Abhishek; P. D. Stevenson; E. Yüksel; B. A. Brown; T. R. Rodriguez; L. M. Robledo; C. Y. Wu; S. Kisyov; C. Müller-Gatermann; V. Bildstein; L. Canete; C. M. Campbell; S. Carmichael; M. P. Carpenter; W. N. Catford; P. Copp; C. Cousins; M. Devlin; D. T. Doherty; P. E. Garrett; U. Garg; L. P. Gaffney; K. Hadynska-Klek; D. J. Hartley; S. F. Hicks; H. Jayatissa; S. R. Johnson; D. Kalaydjieva; F. Kondev; D. Lascar; T. Lauritsen; G. Lotay; N. Marchini; M. Matejska-Minda; S. Nandi; A. Nannini; C. O’Shea; S. Pascu; C. J. Paxman; A. Perkoff; E. E. Peters; Zs Podolyák; A. Radich; R. Rathod; B. J. Reed; P. H. Regan; W. Reviol; E. Rubino; R. Russell; D. Seweryniak; J. R. Vanhoy; G. L. Wilson; K. Wrzosek-Lipska; S. W. Yates; I. Zanon

doi:10.1103/PhysRevLett.134.062502

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Deformation and Collectivity in Doubly Magic Pb 208

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Deformation and Collectivity in Doubly Magic Pb 208

J. Henderson, J. Heery, M. Rocchini, M. Siciliano, N. Sensharma, A. D. Ayangeakaa, R. V. F. Janssens, T. M. Kowalewski, Abhishek, P. D. Stevenson, …

Physical review letters, Vol.134(6), 062502

02/2025

DOI: https://doi.org/10.1103/PhysRevLett.134.062502

Abstract

Lead-208 is the heaviest known doubly magic nucleus and its structure is therefore of special interest. Despite this magicity, which acts to provide a strong restorative force toward sphericity, it is known to exhibit both strong octupole correlations and some of the strongest quadrupole collectivity observed in doubly magic systems. In this Letter, we employ state-of-the-art experimental equipment to conclusively demonstrate, through four Coulomb-excitation measurements, the presence of a large, negative, spectroscopic quadrupole moment for both the vibrational octupole 3 1 − and quadrupole 2 1 + state, indicative of a preference for prolate deformation of the states. The observed quadrupole moment is discussed in the context of the expected splitting of the 3 − ⊗ 3 − two-phonon states, due to the coupling of the quadrupole and octupole motion. These results are compared with theoretical values from three different methods, which are unable to reproduce both the sign and magnitude of this deformation. Thus, in spite of its well-studied nature, Pb 208 remains a puzzle for our understanding of nuclear structure.

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Title: Deformation and Collectivity in Doubly Magic Pb 208
Creators: J. Henderson - University of Surrey
J. Heery - University of Surrey
M. Rocchini - Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
M. Siciliano - Argonne National Laboratory
N. Sensharma - Argonne National Laboratory
A. D. Ayangeakaa - Triangle Universities Nuclear Laboratory
R. V. F. Janssens - Triangle Universities Nuclear Laboratory
T. M. Kowalewski - Triangle Universities Nuclear Laboratory
Abhishek
P. D. Stevenson - University of Surrey
E. Yüksel - University of Surrey
B. A. Brown - Michigan State University
T. R. Rodriguez
L. M. Robledo - Instituto de Física Fundamental
C. Y. Wu - Lawrence Livermore National Laboratory
S. Kisyov - Lawrence Livermore National Laboratory
C. Müller-Gatermann - Argonne National Laboratory
V. Bildstein - University of Guelph
L. Canete - University of Surrey
C. M. Campbell - Lawrence Berkeley National Laboratory
S. Carmichael - Joint Institute for Nuclear Astrophysics
M. P. Carpenter - Argonne National Laboratory
W. N. Catford - University of Surrey
P. Copp - Argonne National Laboratory
C. Cousins
M. Devlin - Los Alamos National Laboratory
D. T. Doherty - University of Surrey
P. E. Garrett - University of Guelph
U. Garg - University of Notre Dame
L. P. Gaffney - University of Liverpool
K. Hadynska-Klek - University of Warsaw
D. J. Hartley - United States Naval Academy
S. F. Hicks - University of Kentucky
H. Jayatissa - Argonne National Laboratory
S. R. Johnson - Triangle Universities Nuclear Laboratory
D. Kalaydjieva - CEA Paris-Saclay
F. Kondev - Argonne National Laboratory
D. Lascar - Northwestern University
T. Lauritsen - Argonne National Laboratory
G. Lotay - University of Surrey
N. Marchini - Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
M. Matejska-Minda - Institute of Nuclear Physics, Polish Academy of Sciences
S. Nandi - Argonne National Laboratory
A. Nannini - Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
C. O’Shea - University of Surrey
S. Pascu - University of Surrey
C. J. Paxman - University of Surrey
A. Perkoff - United States Naval Academy
E. E. Peters - University of Kentucky
Zs Podolyák - University of Surrey
A. Radich - University of Guelph
R. Rathod - Joint Institute for Nuclear Astrophysics
B. J. Reed - University of Surrey
P. H. Regan - University of Surrey
W. Reviol - Argonne National Laboratory
E. Rubino - Michigan State University
R. Russell - University of Surrey
D. Seweryniak - Argonne National Laboratory
J. R. Vanhoy - United States Naval Academy
G. L. Wilson - Argonne National Laboratory
K. Wrzosek-Lipska - University of Warsaw
S. W. Yates - University of Kentucky
I. Zanon - Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
Publication Details: Physical review letters, Vol.134(6), 062502
Publisher: AMER PHYSICAL SOC; COLLEGE PK
Number of pages: 8
Publication Date: 02/2025
Grant note: UKRI Future Leaders Fellowship: MR/T022264/1 Science and Technologies Facilities Council (STFC): ST/V001108/1 NSF: PHY-2208137, PHY-1913028, PHY-2110365 U.S. Department of Energy, Office of Science, Office of Nuclear Physics: DE-AC02-06CH11357, DEAC02-05CH11231 U.S. Department of Energy: DE-AC52-07NA27344, DE-FG02-97ER41041, DE-FG02-97ER41033, 89233218CNA000001, DE-SC0021243 National Science Centre, Poland: 2023/50/E/ST2/00621
The authors thank the beam-delivery team at the ATLAS facility of Argonne National Laboratory for providing the beams. Work at the University of Surrey was supported under UKRI Future Leaders Fellowship Grant No. MR/T022264/1. Work at the University of Surrey was supported under the Science and Technologies Facilities Council (STFC) under Grant No. ST/V001108/1. Work at the University of Liverpool was supported by STFC. Work was supported by the NSF under Grants No. PHY-2208137, No. PHY-2011890, No. PHY-1913028, and No. PHY-2110365. Work of Argonne National Laboratory was sup-ported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. Work at Lawrence Livermore National Laboratory was performed under the auspices of the U.S. Department of Energy under Contract No. DE-AC52-07NA27344. Work at UNC is sponsored by the U.S. Department of Energy under Grants No. DE-FG02-97ER41041 (UNC) and No. DE-FG02-97ER41033 (TUNL) . Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy (Contract No. 89233218CNA000001) . Work was supported under U.S. Department of Energy under Contract No. DE-SC0021243. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DEAC02-05CH11231 (LBNL) . GRETINA was funded by the U.S. DOE, Office of Science, Office of Nuclear Physics, and operated by the ANL and LBNL contract numbers above. This research uses resources of ANL ' s ATLAS facility, which is a U.S. Department of Energy Office of Science User facility. Work was supported by the National Science Centre, Poland under Grant No. 2023/50/E/ST2/00621.
Identifiers: 99977410602346; WOS:001454814000002
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

Deformation and Collectivity in Doubly Magic Pb 208

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