Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A=130 mass region

Petrache, C. M.; Walker, P. M.; Guo, S.; Chen, Q. B.; Frauendorf, S.; Liu, Y. X.; Wyss, R. A.; Mengoni, D.; Qiang, Y. H.; Astier, A.; Dupont, E.; Li, R.; Lv, B. F.; Zheng, K. K.; Bazzacco, D.; Boso, A.; Goasduff, A.; Recchia, F.; Testov, D.; Galtarossa, F.; Jaworski, G.; Napoli, D. R.; Riccetto, S.; Siciliano, M.; Valiente-Dobon, J. J.; Liu, M. L.; Zhou, X. H.; Wang, J. G.; Andreoiu, C.; Garcia, F. H.; Ortner, K.; Whitmore, K.; Bäck, T.; Cederwall, B.; Lawrie, E. A.; Kuti, I.; Sohler, D.; Timár, J.; Marchlewski, T.; Srebrny, J.; Tucholski, A.

doi:10.1016/j.physletb.2019.06.040

Title: Diversity of shapes and rotations in the γ-soft ¹³⁰Ba nucleus: First observation of a t-band in the A=130 mass region

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Abstract

Several new bands have been identified in ¹³⁰Ba, among which there is one with band-head spin $8^{+}$ . Its properties are in agreement with the Fermi-aligned $ν h_{11 / 2}^{2}$ , $7 / 2^{-} [523] Ⓧ 9 / 2^{-} [514]$ Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the $A = 130$ mass region. The t-band is fed by a dipole band involving two additional $h_{11 / 2}$ protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, total Routhians surfaces (TRS), tilted axis cranking (TAC), particle rotor model (PRM) and projected shell model (PSM), which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, ¹³⁰Ba presents one of the best and most complete sets of collective excitations that a γ-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the $A = 130$ mass region.

Authors:

; Walker, P. M.; Guo, S.; Chen, Q. B.; Frauendorf, S.; Liu, Y. X.; Wyss, R. A.; Mengoni, D.; Qiang, Y. H.; Astier, A.; Dupont, E.; Li, R.; Lv, B. F.; Zheng, K. K.; Bazzacco, D.; Boso, A.; Goasduff, A.; Recchia, F.; Testov, D.; Galtarossa, F. more »

Publication Date:: Thu Aug 01 00:00:00 EDT 2019

Research Org.:: Univ. of Notre Dame, IN (United States)

Sponsoring Org.:: National Natural Science Foundation of China (NSFC); National Research Foundation of South Africa; USDOE Office of Science (SC)

OSTI Identifier:: 1528671

Alternate Identifier(s):: OSTI ID: 1632109

Grant/Contract Number:: FG02-03ER83715; FG02-95ER4093

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Name: Physics Letters B Journal Volume: 795 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear structure; Collective rotations; Shape coexistence; Particle rotor model; Projected shell model; Tiltid axis cranking

Citation Formats


                    Petrache, C. M., Walker, P. M., Guo, S., Chen, Q. B., Frauendorf, S., Liu, Y. X., Wyss, R. A., Mengoni, D., Qiang, Y. H., Astier, A., Dupont, E., Li, R., Lv, B. F., Zheng, K. K., Bazzacco, D., Boso, A., Goasduff, A., Recchia, F., Testov, D., Galtarossa, F., Jaworski, G., Napoli, D. R., Riccetto, S., Siciliano, M., Valiente-Dobon, J. J., Liu, M. L., Zhou, X. H., Wang, J. G., Andreoiu, C., Garcia, F. H., Ortner, K., Whitmore, K., Bäck, T., Cederwall, B., Lawrie, E. A., Kuti, I., Sohler, D., Timár, J., Marchlewski, T., Srebrny, J., and Tucholski, A. Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A=130 mass region.  Netherlands: N. p., 2019. 
Web.  doi:10.1016/j.physletb.2019.06.040.

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                    Petrache, C. M., Walker, P. M., Guo, S., Chen, Q. B., Frauendorf, S., Liu, Y. X., Wyss, R. A., Mengoni, D., Qiang, Y. H., Astier, A., Dupont, E., Li, R., Lv, B. F., Zheng, K. K., Bazzacco, D., Boso, A., Goasduff, A., Recchia, F., Testov, D., Galtarossa, F., Jaworski, G., Napoli, D. R., Riccetto, S., Siciliano, M., Valiente-Dobon, J. J., Liu, M. L., Zhou, X. H., Wang, J. G., Andreoiu, C., Garcia, F. H., Ortner, K., Whitmore, K., Bäck, T., Cederwall, B., Lawrie, E. A., Kuti, I., Sohler, D., Timár, J., Marchlewski, T., Srebrny, J., & Tucholski, A. Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A=130 mass region.  Netherlands.  https://doi.org/10.1016/j.physletb.2019.06.040

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                    Petrache, C. M., Walker, P. M., Guo, S., Chen, Q. B., Frauendorf, S., Liu, Y. X., Wyss, R. A., Mengoni, D., Qiang, Y. H., Astier, A., Dupont, E., Li, R., Lv, B. F., Zheng, K. K., Bazzacco, D., Boso, A., Goasduff, A., Recchia, F., Testov, D., Galtarossa, F., Jaworski, G., Napoli, D. R., Riccetto, S., Siciliano, M., Valiente-Dobon, J. J., Liu, M. L., Zhou, X. H., Wang, J. G., Andreoiu, C., Garcia, F. H., Ortner, K., Whitmore, K., Bäck, T., Cederwall, B., Lawrie, E. A., Kuti, I., Sohler, D., Timár, J., Marchlewski, T., Srebrny, J., and Tucholski, A. Thu .  
"Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A=130 mass region".  Netherlands.  https://doi.org/10.1016/j.physletb.2019.06.040.

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@article{osti_1528671,

  title        = {Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A=130 mass region},

  author       = {Petrache, C. M. and Walker, P. M. and Guo, S. and Chen, Q. B. and Frauendorf, S. and Liu, Y. X. and Wyss, R. A. and Mengoni, D. and Qiang, Y. H. and Astier, A. and Dupont, E. and Li, R. and Lv, B. F. and Zheng, K. K. and Bazzacco, D. and Boso, A. and Goasduff, A. and Recchia, F. and Testov, D. and Galtarossa, F. and Jaworski, G. and Napoli, D. R. and Riccetto, S. and Siciliano, M. and Valiente-Dobon, J. J. and Liu, M. L. and Zhou, X. H. and Wang, J. G. and Andreoiu, C. and Garcia, F. H. and Ortner, K. and Whitmore, K. and Bäck, T. and Cederwall, B. and Lawrie, E. A. and Kuti, I. and Sohler, D. and Timár, J. and Marchlewski, T. and Srebrny, J. and Tucholski, A.},

  abstractNote = {Several new bands have been identified in 130Ba, among which there is one with band-head spin 8+. Its properties are in agreement with the Fermi-aligned νh11/22, 7/2-[523]Ⓧ9/2-[514] Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A=130 mass region. The t-band is fed by a dipole band involving two additional h11/2 protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, total Routhians surfaces (TRS), tilted axis cranking (TAC), particle rotor model (PRM) and projected shell model (PSM), which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, 130Ba presents one of the best and most complete sets of collective excitations that a γ-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A=130 mass region.},

  doi          = {10.1016/j.physletb.2019.06.040},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 795,

  place        = {Netherlands},

  year         = {Thu Aug 01 00:00:00 EDT 2019},

  month        = {Thu Aug 01 00:00:00 EDT 2019}

}

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https://doi.org/10.1016/j.physletb.2019.06.040

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Title: Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A=130 mass region

Abstract

Citation Formats

Title: Diversity of shapes and rotations in the γ-soft ¹³⁰Ba nucleus: First observation of a t-band in the A=130 mass region