Suppressed electric quadrupole collectivity in Si 32

J. Heery; J. Henderson; C. R. Hoffman; A. M. Hill; T. Beck; C. Cousins; P. Farris; A. Gade; S. A. Gillespie; J. D. Holt; B. Hu; H. Iwasaki; S. Kisyov; A. N. Kuchera; B. Longfellow; C. Müller-Gatermann; A. Poves; E. Rubino; R. Russell; R. Salinas; A. Sanchez; D. Weisshaar; C. Y. Wu; J. Wu

doi:10.1103/PhysRevC.109.014327

Suppressed electric quadrupole collectivity in Si 32

J. Heery, J. Henderson, C. R. Hoffman, A. M. Hill, T. Beck, C. Cousins, P. Farris, A. Gade, S. A. Gillespie, J. D. Holt, B. Hu, H. Iwasaki, S. Kisyov, A. N. Kuchera, B. Longfellow, C. Müller-Gatermann, A. Poves, E. Rubino, R. Russell, R. SalinasA. Sanchez, D. Weisshaar, C. Y. Wu, J. Wu

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Abstract

Lying between O16 and Ca40, the sd shell is well described by robust phenomenological and ab initio nuclear theories. In this work, however, we highlight an unexplained reduction in electric-quadrupole strength in the rare isotope Si32, studied through sub-barrier Coulomb excitation. It is found that the oblate nature of the deformation is well reproduced, while the absolute scale of quadrupole deformation, however, is inhibited by approximately a factor of 2 compared to theoretical predictions. Through comparison with shell-model and ab initio calculations, we present a number of possible explanations for this inhibited E2 strength. By comparing the results of these calculations to multiple observables, we conclude that there is a reduced role for out-of-space excitations in Si32, resulting in a reduction in the corrections normally applied to both models.

Original language	English
Article number	014327
Journal	Physical Review C
Volume	109
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.109.014327
State	Published - Jan 2024
Externally published	Yes

Funding

The authors thank the beam-delivery team at the National Superconducting Cyclotron Laboratory for providing a high-quality beam. Work at the University of Surrey was supported under UKRI Future Leaders Fellowship Grant No. MR/T022264/1 and by the Science and Technologies Facilities Council (STFC). The work was supported by U.S. DOE Contract No. 89233218CNA000001, by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 (ANL) and under Grant No. DE-SC0020451 (MSU), by the U.S. National Science Foundation (NSF) under Grant No. PHY-1565546, by the DOE National Nuclear Security Administration through the Nuclear Science and Security Consortium under Award No. DE-NA0003180, by NSERC under Grants No. SAPIN-2018-00027 and No. RGPAS-2018-522453, and by the Arthur B. McDonald Canadian Astroparticle Physics Research Institute. Work at Lawrence Livermore National Laboratory was performed under the auspices of the U.S. Department of Energy under Contract No. DE-AC52-07NA27344. A.P. is supported by Grants No. CEX2020-001007-S funded by MCIN/AEI/10.13039/501100011033 and No. PID2021-127890NB-I00. Computations were performed with an allocation of computing resources on Cedar at WestGrid and Compute Canada.

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10.1103/PhysRevC.109.014327

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Heery, J., Henderson, J., Hoffman, C. R., Hill, A. M., Beck, T., Cousins, C., Farris, P., Gade, A., Gillespie, S. A., Holt, J. D., Hu, B., Iwasaki, H., Kisyov, S., Kuchera, A. N., Longfellow, B., Müller-Gatermann, C., Poves, A., Rubino, E., Russell, R., ... Wu, J. (2024). Suppressed electric quadrupole collectivity in Si 32. Physical Review C, 109(1), Article 014327. https://doi.org/10.1103/PhysRevC.109.014327

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title = "Suppressed electric quadrupole collectivity in Si 32",

abstract = "Lying between O16 and Ca40, the sd shell is well described by robust phenomenological and ab initio nuclear theories. In this work, however, we highlight an unexplained reduction in electric-quadrupole strength in the rare isotope Si32, studied through sub-barrier Coulomb excitation. It is found that the oblate nature of the deformation is well reproduced, while the absolute scale of quadrupole deformation, however, is inhibited by approximately a factor of 2 compared to theoretical predictions. Through comparison with shell-model and ab initio calculations, we present a number of possible explanations for this inhibited E2 strength. By comparing the results of these calculations to multiple observables, we conclude that there is a reduced role for out-of-space excitations in Si32, resulting in a reduction in the corrections normally applied to both models.",

author = "J. Heery and J. Henderson and Hoffman, {C. R.} and Hill, {A. M.} and T. Beck and C. Cousins and P. Farris and A. Gade and Gillespie, {S. A.} and Holt, {J. D.} and B. Hu and H. Iwasaki and S. Kisyov and Kuchera, {A. N.} and B. Longfellow and C. M{\"u}ller-Gatermann and A. Poves and E. Rubino and R. Russell and R. Salinas and A. Sanchez and D. Weisshaar and Wu, {C. Y.} and J. Wu",

note = "Publisher Copyright: {\textcopyright} 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.",

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Heery, J, Henderson, J, Hoffman, CR, Hill, AM, Beck, T, Cousins, C, Farris, P, Gade, A, Gillespie, SA, Holt, JD, Hu, B, Iwasaki, H, Kisyov, S, Kuchera, AN, Longfellow, B, Müller-Gatermann, C, Poves, A, Rubino, E, Russell, R, Salinas, R, Sanchez, A, Weisshaar, D, Wu, CY & Wu, J 2024, 'Suppressed electric quadrupole collectivity in Si 32', Physical Review C, vol. 109, no. 1, 014327. https://doi.org/10.1103/PhysRevC.109.014327

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T1 - Suppressed electric quadrupole collectivity in Si 32

AU - Heery, J.

AU - Henderson, J.

AU - Hoffman, C. R.

AU - Hill, A. M.

AU - Beck, T.

AU - Cousins, C.

AU - Farris, P.

AU - Gade, A.

AU - Gillespie, S. A.

AU - Holt, J. D.

AU - Hu, B.

AU - Iwasaki, H.

AU - Kisyov, S.

AU - Kuchera, A. N.

AU - Longfellow, B.

AU - Müller-Gatermann, C.

AU - Poves, A.

AU - Rubino, E.

AU - Russell, R.

AU - Salinas, R.

AU - Sanchez, A.

AU - Weisshaar, D.

AU - Wu, C. Y.

AU - Wu, J.

N1 - Publisher Copyright: © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2024/1

Y1 - 2024/1

N2 - Lying between O16 and Ca40, the sd shell is well described by robust phenomenological and ab initio nuclear theories. In this work, however, we highlight an unexplained reduction in electric-quadrupole strength in the rare isotope Si32, studied through sub-barrier Coulomb excitation. It is found that the oblate nature of the deformation is well reproduced, while the absolute scale of quadrupole deformation, however, is inhibited by approximately a factor of 2 compared to theoretical predictions. Through comparison with shell-model and ab initio calculations, we present a number of possible explanations for this inhibited E2 strength. By comparing the results of these calculations to multiple observables, we conclude that there is a reduced role for out-of-space excitations in Si32, resulting in a reduction in the corrections normally applied to both models.

AB - Lying between O16 and Ca40, the sd shell is well described by robust phenomenological and ab initio nuclear theories. In this work, however, we highlight an unexplained reduction in electric-quadrupole strength in the rare isotope Si32, studied through sub-barrier Coulomb excitation. It is found that the oblate nature of the deformation is well reproduced, while the absolute scale of quadrupole deformation, however, is inhibited by approximately a factor of 2 compared to theoretical predictions. Through comparison with shell-model and ab initio calculations, we present a number of possible explanations for this inhibited E2 strength. By comparing the results of these calculations to multiple observables, we conclude that there is a reduced role for out-of-space excitations in Si32, resulting in a reduction in the corrections normally applied to both models.

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SN - 2469-9985

VL - 109

JO - Physical Review C

JF - Physical Review C

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ER -

Suppressed electric quadrupole collectivity in Si 32

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