Quadrupole moments of collective structures up to spin ̃65h in 157Er and 158Er: A challenge for understanding triaxiality in nuclei

X. Wang; M. A. Riley; J. Simpson; E. S. Paul; J. Ollier; R. V.F. Janssens; A. D. Ayangeakaa; H. C. Boston; M. P. Carpenter; C. J. Chiara; U. Garg; D. J. Hartley; D. S. Judson; F. G. Kondev; T. Lauritsen; N. M. Lumley; J. Matta; P. J. Nolan; M. Petri; J. P. Revill; L. L. Riedinger; S. V. Rigby; C. Unsworth; S. Zhu; I. Ragnarsson

doi:10.1016/j.physletb.2011.07.007

Quadrupole moments of collective structures up to spin ̃65h in 157Er and 158Er: A challenge for understanding triaxiality in nuclei

X. Wang, M. A. Riley, J. Simpson, E. S. Paul, J. Ollier, R. V.F. Janssens, A. D. Ayangeakaa, H. C. Boston, M. P. Carpenter, C. J. Chiara, U. Garg, D. J. Hartley, D. S. Judson, F. G. Kondev, T. Lauritsen, N. M. Lumley, J. Matta, P. J. Nolan, M. Petri, J. P. RevillL. L. Riedinger, S. V. Rigby, C. Unsworth, S. Zhu, I. Ragnarsson

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Abstract

The transition quadrupole moments, Qt, of four weakly populated collective bands up to spin ̃65h in ^157,158Er have been measured to be ̃11 eb demonstrating that these sequences are associated with large deformations. However, the data are inconsistent with calculated values from cranked Nilsson-Strutinsky calculations that predict the lowest energy triaxial shape to be associated with rotation about the short principal axis. The data appear to favor either a stable triaxial shape rotating about the intermediate axis or, alternatively, a triaxial shape with larger deformation rotating about the short axis. These new results challenge the present understanding of triaxiality in nuclei.

Original language	English
Pages (from-to)	127-130
Number of pages	4
Journal	Physics Letters B
Volume	702
Issue number	2-3
DOIs	https://doi.org/10.1016/j.physletb.2011.07.007
State	Published - Aug 11 2011
Externally published	Yes

Funding

The authors acknowledge Paul Morrall for preparing the targets, and the ATLAS operations staff for assistance. Discussions with S. Frauendorf and W. Nazarewicz are greatly appreciated. This work has been supported in part by the U.S. National Science Foundation under grants No. PHY-0756474 (FSU) , PHY-0554762 (USNA) , and PHY-0754674 (UND) , the U.S. Department of Energy, Office of Nuclear Physics , under contracts No. DE-AC02-06CH11357 (ANL) , DE-FG02-94ER40834 (UMD) , DE-AC02-05CH11231 (LBL) , and DE-FG02-96ER40983 (UTK) , the United Kingdom Science and Technology Facilities Council , the Swedish Science Research Council , and by the State of Florida .

Funders	Funder number
LBL	DE-FG02-96ER40983
State of Florida
Swedish Science Research Council
U.S. National Science Foundation	DE-AC02-06CH11357
Directorate for Mathematical and Physical Sciences	0554762, 0754674
Argonne National Laboratory	DE-FG02-94ER40834
University of Maryland	DE-AC02-05CH11231
Science and Technology Facilities Council	ST/F004192/1, ST/I504959/1, ST/J000094/1

Keywords

Cranked Nilsson-Strutinsky calculations
Transition quadrupole moments
Triaxial nuclear shape
Ultrahigh-spin collective structures

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10.1016/j.physletb.2011.07.007

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Wang, X., Riley, M. A., Simpson, J., Paul, E. S., Ollier, J., Janssens, R. V. F., Ayangeakaa, A. D., Boston, H. C., Carpenter, M. P., Chiara, C. J., Garg, U., Hartley, D. J., Judson, D. S., Kondev, F. G., Lauritsen, T., Lumley, N. M., Matta, J., Nolan, P. J., Petri, M., ... Ragnarsson, I. (2011). Quadrupole moments of collective structures up to spin ̃65h in 157Er and 158Er: A challenge for understanding triaxiality in nuclei. Physics Letters B, 702(2-3), 127-130. https://doi.org/10.1016/j.physletb.2011.07.007

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title = "Quadrupole moments of collective structures up to spin{\~ }65h in 157Er and 158Er: A challenge for understanding triaxiality in nuclei",

abstract = "The transition quadrupole moments, Qt, of four weakly populated collective bands up to spin{\~ }65h in 157,158Er have been measured to be{\~ }11 eb demonstrating that these sequences are associated with large deformations. However, the data are inconsistent with calculated values from cranked Nilsson-Strutinsky calculations that predict the lowest energy triaxial shape to be associated with rotation about the short principal axis. The data appear to favor either a stable triaxial shape rotating about the intermediate axis or, alternatively, a triaxial shape with larger deformation rotating about the short axis. These new results challenge the present understanding of triaxiality in nuclei.",

keywords = "Cranked Nilsson-Strutinsky calculations, Transition quadrupole moments, Triaxial nuclear shape, Ultrahigh-spin collective structures",

author = "X. Wang and Riley, {M. A.} and J. Simpson and Paul, {E. S.} and J. Ollier and Janssens, {R. V.F.} and Ayangeakaa, {A. D.} and Boston, {H. C.} and Carpenter, {M. P.} and Chiara, {C. J.} and U. Garg and Hartley, {D. J.} and Judson, {D. S.} and Kondev, {F. G.} and T. Lauritsen and Lumley, {N. M.} and J. Matta and Nolan, {P. J.} and M. Petri and Revill, {J. P.} and Riedinger, {L. L.} and Rigby, {S. V.} and C. Unsworth and S. Zhu and I. Ragnarsson",

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doi = "10.1016/j.physletb.2011.07.007",

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Wang, X, Riley, MA, Simpson, J, Paul, ES, Ollier, J, Janssens, RVF, Ayangeakaa, AD, Boston, HC, Carpenter, MP, Chiara, CJ, Garg, U, Hartley, DJ, Judson, DS, Kondev, FG, Lauritsen, T, Lumley, NM, Matta, J, Nolan, PJ, Petri, M, Revill, JP, Riedinger, LL, Rigby, SV, Unsworth, C, Zhu, S & Ragnarsson, I 2011, 'Quadrupole moments of collective structures up to spin ̃65h in 157Er and 158Er: A challenge for understanding triaxiality in nuclei', Physics Letters B, vol. 702, no. 2-3, pp. 127-130. https://doi.org/10.1016/j.physletb.2011.07.007

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AU - Paul, E. S.

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AU - Judson, D. S.

AU - Kondev, F. G.

AU - Lauritsen, T.

AU - Lumley, N. M.

AU - Matta, J.

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AU - Petri, M.

AU - Revill, J. P.

AU - Riedinger, L. L.

AU - Rigby, S. V.

AU - Unsworth, C.

AU - Zhu, S.

AU - Ragnarsson, I.

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AB - The transition quadrupole moments, Qt, of four weakly populated collective bands up to spin ̃65h in 157,158Er have been measured to be ̃11 eb demonstrating that these sequences are associated with large deformations. However, the data are inconsistent with calculated values from cranked Nilsson-Strutinsky calculations that predict the lowest energy triaxial shape to be associated with rotation about the short principal axis. The data appear to favor either a stable triaxial shape rotating about the intermediate axis or, alternatively, a triaxial shape with larger deformation rotating about the short axis. These new results challenge the present understanding of triaxiality in nuclei.

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Quadrupole moments of collective structures up to spin ̃65h in 157Er and 158Er: A challenge for understanding triaxiality in nuclei

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