Evidence for triaxial shape coexistence in 74Ge

N. Sensharma; A. D. Ayangeakaa; T. M. Kowalewski; R. V.F. Janssens; Y. M. Wang; Q. B. Chen; J. M. Allmond; C. M. Campbell; S. R. Carmichael; M. P. Carpenter; P. Copp; C. Cousins; M. Devlin; U. Garg; C. Müller-Gatermann; D. J. Hartley; J. Heery; J. Henderson; H. Jayatissa; S. R. Johnson; S. P. Kisyov; F. G. Kondev; T. Lauritsen; S. Nandi; R. Rathod; W. Reviol; M. Rocchini; E. Rubino; R. Russell; A. Saracino; D. Seweryniak; M. Siciliano; C. Y. Wu

doi:10.1103/h839-vb3z

Evidence for triaxial shape coexistence in ⁷⁴Ge

N. Sensharma
, A. D. Ayangeakaa
, T. M. Kowalewski
, R. V.F. Janssens
, Y. M. Wang
, Q. B. Chen
, J. M. Allmond
, C. M. Campbell
, S. R. Carmichael
, M. P. Carpenter
, P. Copp
, C. Cousins
, M. Devlin
, U. Garg
, C. Müller-Gatermann
, D. J. Hartley
, J. Heery
, J. Henderson
, H. Jayatissa
, S. R. Johnson

S. P. Kisyov, F. G. Kondev, T. Lauritsen, S. Nandi, R. Rathod, W. Reviol, M. Rocchini, E. Rubino, R. Russell, A. Saracino, D. Seweryniak, M. Siciliano, C. Y. Wu

Nuclear Structure and Nuclear Astrophysi

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

2 Scopus citations

Abstract

The deformation properties of the low-lying states in ⁷⁴Ge have been investigated using multistep Coulomb excitation. The measurements were carried out with the advanced γ -ray tracking array, GRETINA, and the CHICO2 particle detector. A comprehensive set of E2 transition and diagonal matrix elements was deduced following an analysis with the semiclassical coupled-channels code GOSIA. The data were compared with results of calculations carried out within the framework of the generalized triaxial rotor model as well as with the configuration interaction shell model and the symmetric rotor model. Results from calculations with covariant density functional theory were used to construct a five-dimensional collective Hamiltonian for further comparisons with the data. Collectively, the calculations provide an accurate reproduction of the experimental matrix elements and further support an understanding in terms of the coexistence of two axially asymmetric shapes. This leads to an overall interpretation of the underlying structure of ⁷⁴Ge requiring triaxiality, as is also the case in the neighboring even-mass Ge isotopes.

Original language	English
Article number	024311
Journal	Physical Review C
Volume	112
Issue number	2
DOIs	https://doi.org/10.1103/h839-vb3z
State	Published - Aug 4 2025

Funding

This work was supported in part by the U.S. DOE, Office of Science, Office of Nuclear Physics, under Grants No. DE-SC0023010 (UNC), No. DE-FG02-97ER41041 (UNC), No. DE-FG02-97ER41033 (TUNL), No. DE-AC02-06CH11357, No. DE-AC05-00OR22725 (ORNL) and Grants No. DE-FG02-94ER40834, No. DE-FG02-08ER41556, No. DE-FG02-94ER40848, and No. DE-SC0020451; by the NSF under Contracts No. PHY-0606007, No. PHY-2011890, No. PHY-2208137, and No. PHY-2310059; by the UNC Startup Funds of ADA; by the National Natural Science Foundation of China under Grant No. 12205103; and by the National Key R&D Program of China Grants No. 2024YFE0109800 and No. 2024YFE0109803. 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 Los Alamos National Laboratory, operated by Triad National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy was done under Contract No. 89233218CNA000001. GRETINA was funded by the U.S. DOE, Office of Science, Office of Nuclear Physics, and operated by the ANL and LBNL, under Contract No. DEAC02-05CH11231 (LBNL). This research used the resources of Argonne National Laboratory’s ATLAS facility, a DOE Office of Science User Facility.

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Sensharma, N., Ayangeakaa, A. D., Kowalewski, T. M., Janssens, R. V. F., Wang, Y. M., Chen, Q. B., Allmond, J. M., Campbell, C. M., Carmichael, S. R., Carpenter, M. P., Copp, P., Cousins, C., Devlin, M., Garg, U., Müller-Gatermann, C., Hartley, D. J., Heery, J., Henderson, J., Jayatissa, H., ... Wu, C. Y. (2025). Evidence for triaxial shape coexistence in ⁷⁴Ge. Physical Review C, 112(2), Article 024311. https://doi.org/10.1103/h839-vb3z

@article{ad07881cec8c48b9b1a024b91dd96686,

title = "Evidence for triaxial shape coexistence in 74Ge",

abstract = "The deformation properties of the low-lying states in 74Ge have been investigated using multistep Coulomb excitation. The measurements were carried out with the advanced γ -ray tracking array, GRETINA, and the CHICO2 particle detector. A comprehensive set of E2 transition and diagonal matrix elements was deduced following an analysis with the semiclassical coupled-channels code GOSIA. The data were compared with results of calculations carried out within the framework of the generalized triaxial rotor model as well as with the configuration interaction shell model and the symmetric rotor model. Results from calculations with covariant density functional theory were used to construct a five-dimensional collective Hamiltonian for further comparisons with the data. Collectively, the calculations provide an accurate reproduction of the experimental matrix elements and further support an understanding in terms of the coexistence of two axially asymmetric shapes. This leads to an overall interpretation of the underlying structure of 74Ge requiring triaxiality, as is also the case in the neighboring even-mass Ge isotopes.",

author = "N. Sensharma and Ayangeakaa, \{A. D.\} and Kowalewski, \{T. M.\} and Janssens, \{R. V.F.\} and Wang, \{Y. M.\} and Chen, \{Q. B.\} and Allmond, \{J. M.\} and Campbell, \{C. M.\} and Carmichael, \{S. R.\} and Carpenter, \{M. P.\} and P. Copp and C. Cousins and M. Devlin and U. Garg and C. M{\"u}ller-Gatermann and Hartley, \{D. J.\} and J. Heery and J. Henderson and H. Jayatissa and Johnson, \{S. R.\} and Kisyov, \{S. P.\} and Kondev, \{F. G.\} and T. Lauritsen and S. Nandi and R. Rathod and W. Reviol and M. Rocchini and E. Rubino and R. Russell and A. Saracino and D. Seweryniak and M. Siciliano and Wu, \{C. Y.\}",

note = "Publisher Copyright: {\textcopyright} 2025 American Physical Society",

year = "2025",

month = aug,

day = "4",

doi = "10.1103/h839-vb3z",

language = "English",

volume = "112",

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Sensharma, N, Ayangeakaa, AD, Kowalewski, TM, Janssens, RVF, Wang, YM, Chen, QB, Allmond, JM, Campbell, CM, Carmichael, SR, Carpenter, MP, Copp, P, Cousins, C, Devlin, M, Garg, U, Müller-Gatermann, C, Hartley, DJ, Heery, J, Henderson, J, Jayatissa, H, Johnson, SR, Kisyov, SP, Kondev, FG, Lauritsen, T, Nandi, S, Rathod, R, Reviol, W, Rocchini, M, Rubino, E, Russell, R, Saracino, A, Seweryniak, D, Siciliano, M & Wu, CY 2025, 'Evidence for triaxial shape coexistence in ⁷⁴Ge', Physical Review C, vol. 112, no. 2, 024311. https://doi.org/10.1103/h839-vb3z

TY - JOUR

T1 - Evidence for triaxial shape coexistence in 74Ge

AU - Sensharma, N.

AU - Ayangeakaa, A. D.

AU - Kowalewski, T. M.

AU - Janssens, R. V.F.

AU - Wang, Y. M.

AU - Chen, Q. B.

AU - Allmond, J. M.

AU - Campbell, C. M.

AU - Carmichael, S. R.

AU - Carpenter, M. P.

AU - Copp, P.

AU - Cousins, C.

AU - Devlin, M.

AU - Garg, U.

AU - Müller-Gatermann, C.

AU - Hartley, D. J.

AU - Heery, J.

AU - Henderson, J.

AU - Jayatissa, H.

AU - Johnson, S. R.

AU - Kisyov, S. P.

AU - Kondev, F. G.

AU - Lauritsen, T.

AU - Nandi, S.

AU - Rathod, R.

AU - Reviol, W.

AU - Rocchini, M.

AU - Rubino, E.

AU - Russell, R.

AU - Saracino, A.

AU - Seweryniak, D.

AU - Siciliano, M.

AU - Wu, C. Y.

PY - 2025/8/4

Y1 - 2025/8/4

N2 - The deformation properties of the low-lying states in 74Ge have been investigated using multistep Coulomb excitation. The measurements were carried out with the advanced γ -ray tracking array, GRETINA, and the CHICO2 particle detector. A comprehensive set of E2 transition and diagonal matrix elements was deduced following an analysis with the semiclassical coupled-channels code GOSIA. The data were compared with results of calculations carried out within the framework of the generalized triaxial rotor model as well as with the configuration interaction shell model and the symmetric rotor model. Results from calculations with covariant density functional theory were used to construct a five-dimensional collective Hamiltonian for further comparisons with the data. Collectively, the calculations provide an accurate reproduction of the experimental matrix elements and further support an understanding in terms of the coexistence of two axially asymmetric shapes. This leads to an overall interpretation of the underlying structure of 74Ge requiring triaxiality, as is also the case in the neighboring even-mass Ge isotopes.

AB - The deformation properties of the low-lying states in 74Ge have been investigated using multistep Coulomb excitation. The measurements were carried out with the advanced γ -ray tracking array, GRETINA, and the CHICO2 particle detector. A comprehensive set of E2 transition and diagonal matrix elements was deduced following an analysis with the semiclassical coupled-channels code GOSIA. The data were compared with results of calculations carried out within the framework of the generalized triaxial rotor model as well as with the configuration interaction shell model and the symmetric rotor model. Results from calculations with covariant density functional theory were used to construct a five-dimensional collective Hamiltonian for further comparisons with the data. Collectively, the calculations provide an accurate reproduction of the experimental matrix elements and further support an understanding in terms of the coexistence of two axially asymmetric shapes. This leads to an overall interpretation of the underlying structure of 74Ge requiring triaxiality, as is also the case in the neighboring even-mass Ge isotopes.

UR - https://www.scopus.com/pages/publications/105020738838

U2 - 10.1103/h839-vb3z

DO - 10.1103/h839-vb3z

M3 - Article

AN - SCOPUS:105020738838

SN - 2469-9985

VL - 112

JO - Physical Review C

JF - Physical Review C

IS - 2

M1 - 024311

ER -

Evidence for triaxial shape coexistence in ⁷⁴Ge

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