Triaxiality and the nature of low-energy excitations in Ge 76

A. D. Ayangeakaa; R. V.F. Janssens; S. Zhu; J. M. Allmond; B. A. Brown; C. Y. Wu; M. Albers; K. Auranen; B. Bucher; M. P. Carpenter; P. Chowdhury; D. Cline; H. L. Crawford; P. Fallon; A. M. Forney; A. Gade; D. J. Hartley; A. B. Hayes; J. Henderson; F. G. Kondev; Krishichayan; T. Lauritsen; J. Li; D. Little; A. O. MacChiavelli; D. Rhodes; D. Seweryniak; S. M. Stolze; W. B. Walters; J. Wu

doi:10.1103/PhysRevC.107.044314

Triaxiality and the nature of low-energy excitations in Ge 76

A. D. Ayangeakaa, R. V.F. Janssens, S. Zhu, J. M. Allmond, B. A. Brown, C. Y. Wu, M. Albers, K. Auranen, B. Bucher, M. P. Carpenter, P. Chowdhury, D. Cline, H. L. Crawford, P. Fallon, A. M. Forney, A. Gade, D. J. Hartley, A. B. Hayes, J. Henderson, F. G. KondevKrishichayan, T. Lauritsen, J. Li, D. Little, A. O. MacChiavelli, D. Rhodes, D. Seweryniak, S. M. Stolze, W. B. Walters, J. Wu

Nuclear Structure and Nuclear Astrophysi

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Abstract

The deformation properties of the low-lying states in Ge76 have been investigated following a safe-energy Coulomb excitation measurement with the GRETINA tracking array and CHICO2 heavy-ion counter at the ATLAS accelerator facility at Argonne National Laboratory. A comprehensive set of transition and static E2 matrix elements were extracted from the measured differential Coulomb cross sections and compared with results of configuration-interaction shell-model calculations and computations carried out within the framework of the generalized triaxial rotor model. The remarkable agreement between the calculated and experimental data supports a near-maximum triaxial deformation for the ground state of Ge76. In addition, the degree of softness of the asymmetry in Ge76 and Se76 was investigated using rotational invariants generated from configuration-interaction shell-model wave functions computed with the jj44b and JUN45 effective interactions. The resulting invariants are shown to be consistent with a stiff triaxial deformation in Ge76 and a predominantly soft triaxial potential for Se76, in agreement with the conclusions of recent works by this collaboration.

Original language	English
Article number	044314
Journal	Physical Review C
Volume	107
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.107.044314
State	Published - Apr 2023

Funding

This work was funded by the U.S. Department of Energy, 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-FG02-08ER41556 (MSU), No. DE-FG02-94ER40848 (UML), and No. DE-FG02-94ER4084 (Maryland), and under Contracts No. DE-AC02-06CH11357 (ANL), No. DE-AC52-07NA27344 (LLNL), No. DE-AC02-05CH11231 (LBNL), No. DE-AC05-00OR22725 (ORNL), and by the National Science Foundation under Grants No. PHY-1565546, No. PHY-2110365 (MSU), No. DE-SC0020451 (MSU), and No. PHY-1502092 (USNA). GRETINA was funded by the U.S. DOE, Office of Science, Office of Nuclear Physics under the ANL and LBNL contract numbers above. This research used resources of ANL's ATLAS facility, which is a DOE Office of Science User Facility.

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Ayangeakaa, A. D., Janssens, R. V. F., Zhu, S., Allmond, J. M., Brown, B. A., Wu, C. Y., Albers, M., Auranen, K., Bucher, B., Carpenter, M. P., Chowdhury, P., Cline, D., Crawford, H. L., Fallon, P., Forney, A. M., Gade, A., Hartley, D. J., Hayes, A. B., Henderson, J., ... Wu, J. (2023). Triaxiality and the nature of low-energy excitations in Ge 76. Physical Review C, 107(4), Article 044314. https://doi.org/10.1103/PhysRevC.107.044314

@article{77348ab6b2e64baba676d1ed22eeb5f2,

title = "Triaxiality and the nature of low-energy excitations in Ge 76",

abstract = "The deformation properties of the low-lying states in Ge76 have been investigated following a safe-energy Coulomb excitation measurement with the GRETINA tracking array and CHICO2 heavy-ion counter at the ATLAS accelerator facility at Argonne National Laboratory. A comprehensive set of transition and static E2 matrix elements were extracted from the measured differential Coulomb cross sections and compared with results of configuration-interaction shell-model calculations and computations carried out within the framework of the generalized triaxial rotor model. The remarkable agreement between the calculated and experimental data supports a near-maximum triaxial deformation for the ground state of Ge76. In addition, the degree of softness of the asymmetry in Ge76 and Se76 was investigated using rotational invariants generated from configuration-interaction shell-model wave functions computed with the jj44b and JUN45 effective interactions. The resulting invariants are shown to be consistent with a stiff triaxial deformation in Ge76 and a predominantly soft triaxial potential for Se76, in agreement with the conclusions of recent works by this collaboration.",

author = "Ayangeakaa, {A. D.} and Janssens, {R. V.F.} and S. Zhu and Allmond, {J. M.} and Brown, {B. A.} and Wu, {C. Y.} and M. Albers and K. Auranen and B. Bucher and Carpenter, {M. P.} and P. Chowdhury and D. Cline and Crawford, {H. L.} and P. Fallon and Forney, {A. M.} and A. Gade and Hartley, {D. J.} and Hayes, {A. B.} and J. Henderson and Kondev, {F. G.} and Krishichayan and T. Lauritsen and J. Li and D. Little and MacChiavelli, {A. O.} and D. Rhodes and D. Seweryniak and Stolze, {S. M.} and Walters, {W. B.} and J. Wu",

note = "Publisher Copyright: {\textcopyright} 2023 American Physical Society. ",

year = "2023",

month = apr,

doi = "10.1103/PhysRevC.107.044314",

language = "English",

volume = "107",

journal = "Physical Review C",

issn = "2469-9985",

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Ayangeakaa, AD, Janssens, RVF, Zhu, S, Allmond, JM, Brown, BA, Wu, CY, Albers, M, Auranen, K, Bucher, B, Carpenter, MP, Chowdhury, P, Cline, D, Crawford, HL, Fallon, P, Forney, AM, Gade, A, Hartley, DJ, Hayes, AB, Henderson, J, Kondev, FG, Krishichayan, Lauritsen, T, Li, J, Little, D, MacChiavelli, AO, Rhodes, D, Seweryniak, D, Stolze, SM, Walters, WB & Wu, J 2023, 'Triaxiality and the nature of low-energy excitations in Ge 76', Physical Review C, vol. 107, no. 4, 044314. https://doi.org/10.1103/PhysRevC.107.044314

TY - JOUR

T1 - Triaxiality and the nature of low-energy excitations in Ge 76

AU - Ayangeakaa, A. D.

AU - Janssens, R. V.F.

AU - Zhu, S.

AU - Allmond, J. M.

AU - Brown, B. A.

AU - Wu, C. Y.

AU - Albers, M.

AU - Auranen, K.

AU - Bucher, B.

AU - Carpenter, M. P.

AU - Chowdhury, P.

AU - Cline, D.

AU - Crawford, H. L.

AU - Fallon, P.

AU - Forney, A. M.

AU - Gade, A.

AU - Hartley, D. J.

AU - Hayes, A. B.

AU - Henderson, J.

AU - Kondev, F. G.

AU - Krishichayan,

AU - Lauritsen, T.

AU - Li, J.

AU - Little, D.

AU - MacChiavelli, A. O.

AU - Rhodes, D.

AU - Seweryniak, D.

AU - Stolze, S. M.

AU - Walters, W. B.

AU - Wu, J.

PY - 2023/4

Y1 - 2023/4

N2 - The deformation properties of the low-lying states in Ge76 have been investigated following a safe-energy Coulomb excitation measurement with the GRETINA tracking array and CHICO2 heavy-ion counter at the ATLAS accelerator facility at Argonne National Laboratory. A comprehensive set of transition and static E2 matrix elements were extracted from the measured differential Coulomb cross sections and compared with results of configuration-interaction shell-model calculations and computations carried out within the framework of the generalized triaxial rotor model. The remarkable agreement between the calculated and experimental data supports a near-maximum triaxial deformation for the ground state of Ge76. In addition, the degree of softness of the asymmetry in Ge76 and Se76 was investigated using rotational invariants generated from configuration-interaction shell-model wave functions computed with the jj44b and JUN45 effective interactions. The resulting invariants are shown to be consistent with a stiff triaxial deformation in Ge76 and a predominantly soft triaxial potential for Se76, in agreement with the conclusions of recent works by this collaboration.

AB - The deformation properties of the low-lying states in Ge76 have been investigated following a safe-energy Coulomb excitation measurement with the GRETINA tracking array and CHICO2 heavy-ion counter at the ATLAS accelerator facility at Argonne National Laboratory. A comprehensive set of transition and static E2 matrix elements were extracted from the measured differential Coulomb cross sections and compared with results of configuration-interaction shell-model calculations and computations carried out within the framework of the generalized triaxial rotor model. The remarkable agreement between the calculated and experimental data supports a near-maximum triaxial deformation for the ground state of Ge76. In addition, the degree of softness of the asymmetry in Ge76 and Se76 was investigated using rotational invariants generated from configuration-interaction shell-model wave functions computed with the jj44b and JUN45 effective interactions. The resulting invariants are shown to be consistent with a stiff triaxial deformation in Ge76 and a predominantly soft triaxial potential for Se76, in agreement with the conclusions of recent works by this collaboration.

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U2 - 10.1103/PhysRevC.107.044314

DO - 10.1103/PhysRevC.107.044314

M3 - Article

AN - SCOPUS:85160086989

SN - 2469-9985

VL - 107

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 044314

ER -

Triaxiality and the nature of low-energy excitations in Ge 76

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