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. Korichi

T. Lauritsen, A. O. Macchiavelli, A. Richard, D. Seweryniak, A. Wiens

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

72 Scopus citations

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

volume = "754",

pages = "254--259",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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

UR - https://www.scopus.com/pages/publications/84955238241

U2 - 10.1016/j.physletb.2016.01.036

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

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

ER -

Shape coexistence and the role of axial asymmetry in ⁷²Ge

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