Shape coexistence and the role of axial asymmetry in 72Ge

A. D. Ayangeakaa; R. V.F. Janssens; C. Y. Wu; J. M. Allmond; J. L. Wood; S. Zhu; M. Albers; S. Almaraz-Calderon; B. Bucher; M. P. Carpenter; C. J. Chiara; D. Cline; H. L. Crawford; H. M. David; J. Harker; A. B. Hayes; C. R. Hoffman; B. P. Kay; K. Kolos; A. Korichi; T. Lauritsen; A. O. Macchiavelli; A. Richard; D. Seweryniak; A. Wiens

doi:10.1016/j.physletb.2016.01.036

Shape coexistence and the role of axial asymmetry in ⁷²Ge

A. D. Ayangeakaa, R. V.F. Janssens, C. Y. Wu, J. M. Allmond, J. L. Wood, S. Zhu, M. Albers, S. Almaraz-Calderon, B. Bucher, M. P. Carpenter, C. J. Chiara, D. Cline, H. L. Crawford, H. M. David, J. Harker, A. B. Hayes, C. R. Hoffman, B. P. Kay, K. Kolos, A. KorichiT. Lauritsen, A. O. Macchiavelli, A. Richard, D. Seweryniak, A. Wiens

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Abstract

The quadrupole collectivity of low-lying states and the anomalous behavior of the 02+ and 23+ levels in ⁷²Ge are investigated via projectile multi-step Coulomb excitation with GRETINA and CHICO-2. A total of forty six E2 and M1 matrix elements connecting fourteen low-lying levels were determined using the least-squares search code, gosia. Evidence for triaxiality and shape coexistence, based on the model-independent shape invariants deduced from the Kumar-Cline sum rule, is presented. These are interpreted using a simple two-state mixing model as well as multi-state mixing calculations carried out within the framework of the triaxial rotor model. The results represent a significant milestone towards the understanding of the unusual structure of this nucleus.

Original language	English
Pages (from-to)	254-259
Number of pages	6
Journal	Physics Letters B
Volume	754
DOIs	https://doi.org/10.1016/j.physletb.2016.01.036
State	Published - Mar 10 2016

Funding

This material is based upon work supported by the U.S. Department of Energy , Office of Science, Office of Nuclear Physics under Contract numbers DE-AC02-06CH11357 and DE-AC52-07NA27344 , and under Grant Numbers DE-FG02-94ER40834 and DE-FG02- 08ER41556 , and by the National Science Foundation under grant number 0969079 . 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., Wu, C. Y., Allmond, J. M., Wood, J. L., Zhu, S., Albers, M., Almaraz-Calderon, S., Bucher, B., Carpenter, M. P., Chiara, C. J., Cline, D., Crawford, H. L., David, H. M., Harker, J., Hayes, A. B., Hoffman, C. R., Kay, B. P., Kolos, K., ... Wiens, A. (2016). Shape coexistence and the role of axial asymmetry in ⁷²Ge. Physics Letters B, 754, 254-259. https://doi.org/10.1016/j.physletb.2016.01.036

@article{63f695fab8cc441ea8a4b1866d1fbe1d,

title = "Shape coexistence and the role of axial asymmetry in 72Ge",

abstract = "The quadrupole collectivity of low-lying states and the anomalous behavior of the 02+ and 23+ levels in 72Ge are investigated via projectile multi-step Coulomb excitation with GRETINA and CHICO-2. A total of forty six E2 and M1 matrix elements connecting fourteen low-lying levels were determined using the least-squares search code, gosia. Evidence for triaxiality and shape coexistence, based on the model-independent shape invariants deduced from the Kumar-Cline sum rule, is presented. These are interpreted using a simple two-state mixing model as well as multi-state mixing calculations carried out within the framework of the triaxial rotor model. The results represent a significant milestone towards the understanding of the unusual structure of this nucleus.",

author = "Ayangeakaa, {A. D.} and Janssens, {R. V.F.} and Wu, {C. Y.} and Allmond, {J. M.} and Wood, {J. L.} and S. Zhu and M. Albers and S. Almaraz-Calderon and B. Bucher and Carpenter, {M. P.} and Chiara, {C. J.} and D. Cline and Crawford, {H. L.} and David, {H. M.} and J. Harker and Hayes, {A. B.} and Hoffman, {C. R.} and Kay, {B. P.} and K. Kolos and A. Korichi and T. Lauritsen and Macchiavelli, {A. O.} and A. Richard and D. Seweryniak and A. Wiens",

note = "Publisher Copyright: {\textcopyright} 2016 The Authors.",

year = "2016",

month = mar,

day = "10",

doi = "10.1016/j.physletb.2016.01.036",

language = "English",

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Ayangeakaa, AD, Janssens, RVF, Wu, CY, Allmond, JM, Wood, JL, Zhu, S, Albers, M, Almaraz-Calderon, S, Bucher, B, Carpenter, MP, Chiara, CJ, Cline, D, Crawford, HL, David, HM, Harker, J, Hayes, AB, Hoffman, CR, Kay, BP, Kolos, K, Korichi, A, Lauritsen, T, Macchiavelli, AO, Richard, A, Seweryniak, D & Wiens, A 2016, 'Shape coexistence and the role of axial asymmetry in ⁷²Ge', Physics Letters B, vol. 754, pp. 254-259. https://doi.org/10.1016/j.physletb.2016.01.036

TY - JOUR

T1 - Shape coexistence and the role of axial asymmetry in 72Ge

AU - Ayangeakaa, A. D.

AU - Janssens, R. V.F.

AU - Wu, C. Y.

AU - Allmond, J. M.

AU - Wood, J. L.

AU - Zhu, S.

AU - Albers, M.

AU - Almaraz-Calderon, S.

AU - Bucher, B.

AU - Carpenter, M. P.

AU - Chiara, C. J.

AU - Cline, D.

AU - Crawford, H. L.

AU - David, H. M.

AU - Harker, J.

AU - Hayes, A. B.

AU - Hoffman, C. R.

AU - Kay, B. P.

AU - Kolos, K.

AU - Korichi, A.

AU - Lauritsen, T.

AU - Macchiavelli, A. O.

AU - Richard, A.

AU - Seweryniak, D.

AU - Wiens, A.

PY - 2016/3/10

Y1 - 2016/3/10

N2 - The quadrupole collectivity of low-lying states and the anomalous behavior of the 02+ and 23+ levels in 72Ge are investigated via projectile multi-step Coulomb excitation with GRETINA and CHICO-2. A total of forty six E2 and M1 matrix elements connecting fourteen low-lying levels were determined using the least-squares search code, gosia. Evidence for triaxiality and shape coexistence, based on the model-independent shape invariants deduced from the Kumar-Cline sum rule, is presented. These are interpreted using a simple two-state mixing model as well as multi-state mixing calculations carried out within the framework of the triaxial rotor model. The results represent a significant milestone towards the understanding of the unusual structure of this nucleus.

AB - The quadrupole collectivity of low-lying states and the anomalous behavior of the 02+ and 23+ levels in 72Ge are investigated via projectile multi-step Coulomb excitation with GRETINA and CHICO-2. A total of forty six E2 and M1 matrix elements connecting fourteen low-lying levels were determined using the least-squares search code, gosia. Evidence for triaxiality and shape coexistence, based on the model-independent shape invariants deduced from the Kumar-Cline sum rule, is presented. These are interpreted using a simple two-state mixing model as well as multi-state mixing calculations carried out within the framework of the triaxial rotor model. The results represent a significant milestone towards the understanding of the unusual structure of this nucleus.

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DO - 10.1016/j.physletb.2016.01.036

M3 - Article

AN - SCOPUS:84955238241

SN - 0370-2693

VL - 754

SP - 254

EP - 259

JO - Physics Letters B

JF - Physics Letters B

ER -

Shape coexistence and the role of axial asymmetry in ⁷²Ge

Abstract

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