Probing the N = 14 subshell closure: g factor of the Mg26(21                             +) state

B. P. McCormick; A. E. Stuchbery; T. Kibédi; G. J. Lane; M. W. Reed; T. K. Eriksen; S. S. Hota; B. Q. Lee; N. Palalani

doi:10.1016/j.physletb.2018.02.032

Probing the N = 14 subshell closure: g factor of the Mg26(2₁ ⁺) state

B. P. McCormick, A. E. Stuchbery^*, T. Kibédi, G. J. Lane, M. W. Reed, T. K. Eriksen, S. S. Hota, B. Q. Lee, N. Palalani

^*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

The first-excited state g factor of ²⁶Mg has been measured relative to the g factor of the Mg24(2₁ ⁺) state using the high-velocity transient-field technique, giving g=+0.86±0.10. This new measurement is in strong disagreement with the currently adopted value, but in agreement with the sd-shell model using the USDB interaction. The newly measured g factor, along with E(2₁ ⁺) and B(E2) systematics, signal the closure of the νd_5/2 subshell at N=14. The possibility that precise g-factor measurements may indicate the onset of neutron pf admixtures in first-excited state even–even magnesium isotopes below ³²Mg is discussed and the importance of precise excited-state g-factor measurements on sd shell nuclei with N≠Z to test shell-model wavefunctions is noted.

Original language	English
Pages (from-to)	445-451
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	779
DOIs	https://doi.org/10.1016/j.physletb.2018.02.032
Publication status	Published - 10 Apr 2018

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McCormick, B. P., Stuchbery, A. E., Kibédi, T., Lane, G. J., Reed, M. W., Eriksen, T. K., Hota, S. S., Lee, B. Q., & Palalani, N. (2018). Probing the N = 14 subshell closure: g factor of the Mg26(2₁ ⁺) state. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 779, 445-451. https://doi.org/10.1016/j.physletb.2018.02.032

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title = "Probing the N = 14 subshell closure: g factor of the Mg26(21 +) state",

abstract = "The first-excited state g factor of 26Mg has been measured relative to the g factor of the Mg24(21 +) state using the high-velocity transient-field technique, giving g=+0.86±0.10. This new measurement is in strong disagreement with the currently adopted value, but in agreement with the sd-shell model using the USDB interaction. The newly measured g factor, along with E(21 +) and B(E2) systematics, signal the closure of the νd5/2 subshell at N=14. The possibility that precise g-factor measurements may indicate the onset of neutron pf admixtures in first-excited state even–even magnesium isotopes below 32Mg is discussed and the importance of precise excited-state g-factor measurements on sd shell nuclei with N≠Z to test shell-model wavefunctions is noted.",

keywords = "Island of inversion, Mg, Shell-model calculations, Transient-field, g factors, sd shell",

author = "McCormick, {B. P.} and Stuchbery, {A. E.} and T. Kib{\'e}di and Lane, {G. J.} and Reed, {M. W.} and Eriksen, {T. K.} and Hota, {S. S.} and Lee, {B. Q.} and N. Palalani",

note = "Publisher Copyright: {\textcopyright} 2018 The Authors",

year = "2018",

month = apr,

day = "10",

doi = "10.1016/j.physletb.2018.02.032",

language = "English",

volume = "779",

pages = "445--451",

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T1 - Probing the N = 14 subshell closure

T2 - g factor of the Mg26(21 +) state

AU - McCormick, B. P.

AU - Stuchbery, A. E.

AU - Kibédi, T.

AU - Lane, G. J.

AU - Reed, M. W.

AU - Eriksen, T. K.

AU - Hota, S. S.

AU - Lee, B. Q.

AU - Palalani, N.

PY - 2018/4/10

Y1 - 2018/4/10

N2 - The first-excited state g factor of 26Mg has been measured relative to the g factor of the Mg24(21 +) state using the high-velocity transient-field technique, giving g=+0.86±0.10. This new measurement is in strong disagreement with the currently adopted value, but in agreement with the sd-shell model using the USDB interaction. The newly measured g factor, along with E(21 +) and B(E2) systematics, signal the closure of the νd5/2 subshell at N=14. The possibility that precise g-factor measurements may indicate the onset of neutron pf admixtures in first-excited state even–even magnesium isotopes below 32Mg is discussed and the importance of precise excited-state g-factor measurements on sd shell nuclei with N≠Z to test shell-model wavefunctions is noted.

AB - The first-excited state g factor of 26Mg has been measured relative to the g factor of the Mg24(21 +) state using the high-velocity transient-field technique, giving g=+0.86±0.10. This new measurement is in strong disagreement with the currently adopted value, but in agreement with the sd-shell model using the USDB interaction. The newly measured g factor, along with E(21 +) and B(E2) systematics, signal the closure of the νd5/2 subshell at N=14. The possibility that precise g-factor measurements may indicate the onset of neutron pf admixtures in first-excited state even–even magnesium isotopes below 32Mg is discussed and the importance of precise excited-state g-factor measurements on sd shell nuclei with N≠Z to test shell-model wavefunctions is noted.

KW - Island of inversion

KW - Mg

KW - Shell-model calculations

KW - Transient-field

KW - g factors

KW - sd shell

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U2 - 10.1016/j.physletb.2018.02.032

DO - 10.1016/j.physletb.2018.02.032

M3 - Article

SN - 0370-2693

VL - 779

SP - 445

EP - 451

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Probing the N = 14 subshell closure: g factor of the Mg26(2₁ ⁺) state

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