Octupole deformation in 143,145,146Ba

N. T. Brewer; E. H. Wang; W. A. Yzaguirre; J. H. Hamilton; K. Nomura; A. V. Ramayya; S. H. Liu; J. K. Hwang; B. M. Musangu; J. M. Eldridge; C. J. Zachary; Y. X. Luo; J. O. Rasmussen; S. J. Zhu; C. Goodin; G. M. Ter-Akopian; A. V. Daniel; Yu Ts Oganessian

doi:10.1016/j.nuclphysa.2023.122738

Octupole deformation in ^143,145,146Ba

N. T. Brewer
, E. H. Wang
, W. A. Yzaguirre
, J. H. Hamilton
, K. Nomura
, A. V. Ramayya
, S. H. Liu
, J. K. Hwang
, B. M. Musangu
, J. M. Eldridge
, C. J. Zachary
, Y. X. Luo
, J. O. Rasmussen
, S. J. Zhu
, C. Goodin
, G. M. Ter-Akopian
, A. V. Daniel
, Yu Ts Oganessian

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

2 Scopus citations

Abstract

Gamma rays emitted by fission fragments of ²⁵²Cf and measured using the Gammasphere array continue to give insight into neutron rich nuclei. Using our high statistics data, we have reexamined high-spin states and linking transitions associated with octupole correlations in ^143,145,146Ba. This has been a region of interest, when it was proposed that near ¹⁴⁵Ba there was a region of octupole deformation. In an even-A system, it is possible that rotational band structures are explainable by simplex quantum numbers, s=+1 and s=−1. The previous bands including octupole bands in ^143,145,146Ba have been extended. The new s=i octupole bands in ¹⁴⁵Ba and new s=−1 octupole bands in ¹⁴⁶Ba have been identified. In addition, collective model analysis of energy displacement, rotational frequency and B(E1)/B(E2) ratios have been carried out. Evidence of the rotational consequences of octupole deformation in even-even and even-odd isotopes is given. These nuclei have trends as rotation stabilizes the vibrational degrees of freedom. The experimental results are in agreement with theoretical calculations using the interacting boson and boson-fermion models that are based on a universal nuclear energy density functional.

Original language	English
Article number	122738
Journal	Nuclear Physics A
Volume	1039
DOIs	https://doi.org/10.1016/j.nuclphysa.2023.122738
State	Published - Nov 2023
Externally published	Yes

Funding

The work at Vanderbilt University and Lawrence Berkeley National Laboratory was supported by the U.S. Department of Energy under Grant and Contract Nos. DE-FG05-88ER40407 and DE-AC03-76SF00098. The work at Tsinghua University was supported by the National Natural Science Foundation of China under Grant Nos. 11175095. The Joint Institute for Heavy Ion Research is supported by its members, the University of Tennessee, Vanderbilt University, and the US DOE through Contract No. DE-FG05-87ER40311 with the University of Tennessee. The work of K.N. is supported by the Tenure Track Pilot Programme of the Croatian Science Foundation and the École Polytechnique Fédérale de Lausanne, and the Project TTP-2018-07-3554 Exotic Nuclear Structure and Dynamics, with funds of the Croatian-Swiss Research Programme. The work at JINR was supported by the Russian Foundation for Basic Research Grant No. 08-02-00089 and by the INTAS Grant No. 03-51-4496.

Keywords

B(E1)/B(E2) ratios
Ba
Cf spontaneous fission
Gammasphere
Interacting boson and boson-fermion models
Octupole

Access to Document

10.1016/j.nuclphysa.2023.122738

Cite this

Brewer, N. T., Wang, E. H., Yzaguirre, W. A., Hamilton, J. H., Nomura, K., Ramayya, A. V., Liu, S. H., Hwang, J. K., Musangu, B. M., Eldridge, J. M., Zachary, C. J., Luo, Y. X., Rasmussen, J. O., Zhu, S. J., Goodin, C., Ter-Akopian, G. M., Daniel, A. V., & Oganessian, Y. T. (2023). Octupole deformation in ^143,145,146Ba. Nuclear Physics A, 1039, Article 122738. https://doi.org/10.1016/j.nuclphysa.2023.122738

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title = "Octupole deformation in 143,145,146Ba",

abstract = "Gamma rays emitted by fission fragments of 252Cf and measured using the Gammasphere array continue to give insight into neutron rich nuclei. Using our high statistics data, we have reexamined high-spin states and linking transitions associated with octupole correlations in 143,145,146Ba. This has been a region of interest, when it was proposed that near 145Ba there was a region of octupole deformation. In an even-A system, it is possible that rotational band structures are explainable by simplex quantum numbers, s=+1 and s=−1. The previous bands including octupole bands in 143,145,146Ba have been extended. The new s=i octupole bands in 145Ba and new s=−1 octupole bands in 146Ba have been identified. In addition, collective model analysis of energy displacement, rotational frequency and B(E1)/B(E2) ratios have been carried out. Evidence of the rotational consequences of octupole deformation in even-even and even-odd isotopes is given. These nuclei have trends as rotation stabilizes the vibrational degrees of freedom. The experimental results are in agreement with theoretical calculations using the interacting boson and boson-fermion models that are based on a universal nuclear energy density functional.",

keywords = "B(E1)/B(E2) ratios, Ba, Cf spontaneous fission, Gammasphere, Interacting boson and boson-fermion models, Octupole",

author = "Brewer, \{N. T.\} and Wang, \{E. H.\} and Yzaguirre, \{W. A.\} and Hamilton, \{J. H.\} and K. Nomura and Ramayya, \{A. V.\} and Liu, \{S. H.\} and Hwang, \{J. K.\} and Musangu, \{B. M.\} and Eldridge, \{J. M.\} and Zachary, \{C. J.\} and Luo, \{Y. X.\} and Rasmussen, \{J. O.\} and Zhu, \{S. J.\} and C. Goodin and Ter-Akopian, \{G. M.\} and Daniel, \{A. V.\} and Oganessian, \{Yu Ts\}",

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year = "2023",

month = nov,

doi = "10.1016/j.nuclphysa.2023.122738",

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AU - Brewer, N. T.

AU - Wang, E. H.

AU - Yzaguirre, W. A.

AU - Hamilton, J. H.

AU - Nomura, K.

AU - Ramayya, A. V.

AU - Liu, S. H.

AU - Hwang, J. K.

AU - Musangu, B. M.

AU - Eldridge, J. M.

AU - Zachary, C. J.

AU - Luo, Y. X.

AU - Rasmussen, J. O.

AU - Zhu, S. J.

AU - Goodin, C.

AU - Ter-Akopian, G. M.

AU - Daniel, A. V.

AU - Oganessian, Yu Ts

PY - 2023/11

Y1 - 2023/11

N2 - Gamma rays emitted by fission fragments of 252Cf and measured using the Gammasphere array continue to give insight into neutron rich nuclei. Using our high statistics data, we have reexamined high-spin states and linking transitions associated with octupole correlations in 143,145,146Ba. This has been a region of interest, when it was proposed that near 145Ba there was a region of octupole deformation. In an even-A system, it is possible that rotational band structures are explainable by simplex quantum numbers, s=+1 and s=−1. The previous bands including octupole bands in 143,145,146Ba have been extended. The new s=i octupole bands in 145Ba and new s=−1 octupole bands in 146Ba have been identified. In addition, collective model analysis of energy displacement, rotational frequency and B(E1)/B(E2) ratios have been carried out. Evidence of the rotational consequences of octupole deformation in even-even and even-odd isotopes is given. These nuclei have trends as rotation stabilizes the vibrational degrees of freedom. The experimental results are in agreement with theoretical calculations using the interacting boson and boson-fermion models that are based on a universal nuclear energy density functional.

AB - Gamma rays emitted by fission fragments of 252Cf and measured using the Gammasphere array continue to give insight into neutron rich nuclei. Using our high statistics data, we have reexamined high-spin states and linking transitions associated with octupole correlations in 143,145,146Ba. This has been a region of interest, when it was proposed that near 145Ba there was a region of octupole deformation. In an even-A system, it is possible that rotational band structures are explainable by simplex quantum numbers, s=+1 and s=−1. The previous bands including octupole bands in 143,145,146Ba have been extended. The new s=i octupole bands in 145Ba and new s=−1 octupole bands in 146Ba have been identified. In addition, collective model analysis of energy displacement, rotational frequency and B(E1)/B(E2) ratios have been carried out. Evidence of the rotational consequences of octupole deformation in even-even and even-odd isotopes is given. These nuclei have trends as rotation stabilizes the vibrational degrees of freedom. The experimental results are in agreement with theoretical calculations using the interacting boson and boson-fermion models that are based on a universal nuclear energy density functional.

KW - B(E1)/B(E2) ratios

KW - Ba

KW - Cf spontaneous fission

KW - Gammasphere

KW - Interacting boson and boson-fermion models

KW - Octupole

UR - https://www.scopus.com/pages/publications/85168813353

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DO - 10.1016/j.nuclphysa.2023.122738

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