Laser Spectroscopy of Neutron-Rich 207,208Hg Isotopes: Illuminating the Kink and Odd-Even Staggering in Charge Radii across the N = 126 Shell Closure

Lars Ghys; A.V. Afanasjev; Thomas Day Goodacre; Anatoly (A.E.) Barzakh; Anatoly (A.E.) Barzakh; Bruce A Marsh; Simon Sels; P. Ring; Andrei N. Andreyev; Piet Van Duppen; Numa A. Althubiti; Boris Andel; Dimitar Atanasov

doi:10.1103/PhysRevLett.126.032502

Laser Spectroscopy of Neutron-Rich 207,208Hg Isotopes: Illuminating the Kink and Odd-Even Staggering in Charge Radii across the N = 126 Shell Closure

Lars Ghys, A.V. Afanasjev, Thomas Day Goodacre, Anatoly (A.E.) Barzakh, Anatoly (A.E.) Barzakh, Bruce A Marsh, Simon Sels, P. Ring, Andrei N. Andreyev, Piet Van Duppen, Numa A. Althubiti, Boris Andel, Dimitar Atanasov

Safety Environment & Health

Research output › peer-review

Abstract

The mean-square charge radii of 207;208Hg (Z ¼ 80, N ¼ 127, 128) have been studied for the first time and those of 202;203;206Hg (N ¼ 122, 123, 126) remeasured by the application of in-source resonance-ionization laser spectroscopy at ISOLDE (CERN). The characteristic kink in the charge radii at the
N = 126 neutron shell closure has been revealed, providing the first information on its behavior below the Z = 82 proton shell closure. A theoretical analysis has been performed within relativistic Hartree-Bogoliubov and nonrelativistic Hartree-Fock-Bogoliubov approaches, considering both the new mercury
results and existing lead data. Contrary to previous interpretations, it is demonstrated that both the kink at N ¼ 126 and the odd-even staggering (OES) in its vicinity can be described predominately at the meanfield level and that pairing does not need to play a crucial role in their origin. A new OES mechanism is suggested, related to the staggering in the occupation of the different neutron orbitals in odd- and even-A nuclei, facilitated by particle-vibration coupling for odd-A nuclei.

Original language	English
Article number	032502
Pages (from-to)	1-7
Number of pages	7
Journal	Physical review Letters
Volume	126
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.126.032502
State	Published - 22 Jan 2021

Access to Document

10.1103/PhysRevLett.126.032502License: Unspecified

Cite this

Ghys, L., Afanasjev, A. V., Day Goodacre, T., Barzakh, A., Barzakh, A., Marsh, B. A., Sels, S., Ring, P., Andreyev, A. N., Van Duppen, P., Althubiti, N. A., Andel, B., & Atanasov, D. (2021). Laser Spectroscopy of Neutron-Rich 207,208Hg Isotopes: Illuminating the Kink and Odd-Even Staggering in Charge Radii across the N = 126 Shell Closure. Physical review Letters, 126(3), 1-7. Article 032502. https://doi.org/10.1103/PhysRevLett.126.032502

@article{cc1aaee101714cb4bfca4c573a5554e7,

title = "Laser Spectroscopy of Neutron-Rich 207,208Hg Isotopes: Illuminating the Kink and Odd-Even Staggering in Charge Radii across the N = 126 Shell Closure",

abstract = "The mean-square charge radii of 207;208Hg (Z ¼ 80, N ¼ 127, 128) have been studied for the first time and those of 202;203;206Hg (N ¼ 122, 123, 126) remeasured by the application of in-source resonance-ionization laser spectroscopy at ISOLDE (CERN). The characteristic kink in the charge radii at theN = 126 neutron shell closure has been revealed, providing the first information on its behavior below the Z = 82 proton shell closure. A theoretical analysis has been performed within relativistic Hartree-Bogoliubov and nonrelativistic Hartree-Fock-Bogoliubov approaches, considering both the new mercuryresults and existing lead data. Contrary to previous interpretations, it is demonstrated that both the kink at N ¼ 126 and the odd-even staggering (OES) in its vicinity can be described predominately at the meanfield level and that pairing does not need to play a crucial role in their origin. A new OES mechanism is suggested, related to the staggering in the occupation of the different neutron orbitals in odd- and even-A nuclei, facilitated by particle-vibration coupling for odd-A nuclei. ",

keywords = "Isotopes, Laser spectroscopy, Nuclear charge, Nuclear Phsyics",

author = "Lars Ghys and A.V. Afanasjev and {Day Goodacre}, Thomas and Barzakh, {Anatoly (A.E.)} and Barzakh, {Anatoly (A.E.)} and Marsh, {Bruce A} and Simon Sels and P. Ring and Andreyev, {Andrei N.} and {Van Duppen}, Piet and Althubiti, {Numa A.} and Boris Andel and Dimitar Atanasov",

note = "Score=10",

year = "2021",

month = jan,

day = "22",

doi = "10.1103/PhysRevLett.126.032502",

language = "English",

volume = "126",

pages = "1--7",

journal = "Physical review Letters",

issn = "0031-9007",

publisher = "APS - American Physical Society",

number = "3",

}

Ghys, L, Afanasjev, AV, Day Goodacre, T, Barzakh, A, Barzakh, A, Marsh, BA, Sels, S, Ring, P, Andreyev, AN, Van Duppen, P, Althubiti, NA, Andel, B & Atanasov, D 2021, 'Laser Spectroscopy of Neutron-Rich 207,208Hg Isotopes: Illuminating the Kink and Odd-Even Staggering in Charge Radii across the N = 126 Shell Closure', Physical review Letters, vol. 126, no. 3, 032502, pp. 1-7. https://doi.org/10.1103/PhysRevLett.126.032502

TY - JOUR

T1 - Laser Spectroscopy of Neutron-Rich 207,208Hg Isotopes: Illuminating the Kink and Odd-Even Staggering in Charge Radii across the N = 126 Shell Closure

AU - Ghys, Lars

AU - Afanasjev, A.V.

AU - Day Goodacre, Thomas

AU - Barzakh, Anatoly (A.E.)

AU - Marsh, Bruce A

AU - Sels, Simon

AU - Ring, P.

AU - Andreyev, Andrei N.

AU - Van Duppen, Piet

AU - Althubiti, Numa A.

AU - Andel, Boris

AU - Atanasov, Dimitar

N1 - Score=10

PY - 2021/1/22

Y1 - 2021/1/22

N2 - The mean-square charge radii of 207;208Hg (Z ¼ 80, N ¼ 127, 128) have been studied for the first time and those of 202;203;206Hg (N ¼ 122, 123, 126) remeasured by the application of in-source resonance-ionization laser spectroscopy at ISOLDE (CERN). The characteristic kink in the charge radii at theN = 126 neutron shell closure has been revealed, providing the first information on its behavior below the Z = 82 proton shell closure. A theoretical analysis has been performed within relativistic Hartree-Bogoliubov and nonrelativistic Hartree-Fock-Bogoliubov approaches, considering both the new mercuryresults and existing lead data. Contrary to previous interpretations, it is demonstrated that both the kink at N ¼ 126 and the odd-even staggering (OES) in its vicinity can be described predominately at the meanfield level and that pairing does not need to play a crucial role in their origin. A new OES mechanism is suggested, related to the staggering in the occupation of the different neutron orbitals in odd- and even-A nuclei, facilitated by particle-vibration coupling for odd-A nuclei.

AB - The mean-square charge radii of 207;208Hg (Z ¼ 80, N ¼ 127, 128) have been studied for the first time and those of 202;203;206Hg (N ¼ 122, 123, 126) remeasured by the application of in-source resonance-ionization laser spectroscopy at ISOLDE (CERN). The characteristic kink in the charge radii at theN = 126 neutron shell closure has been revealed, providing the first information on its behavior below the Z = 82 proton shell closure. A theoretical analysis has been performed within relativistic Hartree-Bogoliubov and nonrelativistic Hartree-Fock-Bogoliubov approaches, considering both the new mercuryresults and existing lead data. Contrary to previous interpretations, it is demonstrated that both the kink at N ¼ 126 and the odd-even staggering (OES) in its vicinity can be described predominately at the meanfield level and that pairing does not need to play a crucial role in their origin. A new OES mechanism is suggested, related to the staggering in the occupation of the different neutron orbitals in odd- and even-A nuclei, facilitated by particle-vibration coupling for odd-A nuclei.

KW - Isotopes

KW - Laser spectroscopy

KW - Nuclear charge

KW - Nuclear Phsyics

UR - https://ecm.sckcen.be/OTCS/llisapi.dll?func=ll&objaction=overview&objid=43022783

U2 - 10.1103/PhysRevLett.126.032502

DO - 10.1103/PhysRevLett.126.032502

M3 - Article

SN - 0031-9007

VL - 126

SP - 1

EP - 7

JO - Physical review Letters

JF - Physical review Letters

IS - 3

M1 - 032502

ER -