Prolate-oblate shape coexistence close to the ground state in the strongly-deformed proton-rich nuclei is reported for the first time. One of the four reported bands in $^{119}$Cs, built on a state at 670 keV, consists of nearly degenerate signature partners, and has properties which unequivocally indicate the strongly-coupled configuration associated with oblate shape. Together with the decoupled band built on the prolate state at 110 keV, for which a half-life of has been measured, the new bands bring evidence of shape coexistence at low spin in the proton-rich strongly deformed nuclei, a phenomenon predicted since long time, but not yet observed. Calculations using the particle-number conserving cranked shell model and two dimensional tilted axis cranking covariant density functional theory support and well reproduce the observed oblate and prolate coexisting low-energy states in $^{119}$Cs.
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"affiliations": [ { "country": "China", "value": "Mathematics and Physics Department, North China Electric Power University, Beijing, China" } ], "surname": "Zhang", "given_names": "Z.H.", "full_name": "Zhang, Z.H." }, { "affiliations": [ { "country": "China", "value": "State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing, China" } ], "surname": "Zhao", "given_names": "P.W.", "full_name": "Zhao, P.W." }, { "affiliations": [ { "country": "China", "value": "State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing, China" } ], "surname": "Wang", "given_names": "Y.K.", "full_name": "Wang, Y.K." }, { "affiliations": [ { "country": "France", "value": "Universit\u00e9 Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France" } ], "surname": "Astier", "given_names": "A.", "full_name": "Astier, A." }, { "affiliations": [ { "country": "France", "value": "Universit\u00e9 Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, 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"titles": [ { "source": "Elsevier", "title": "Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus Cs" } ], "collections": [ { "primary": "Physics Letters B" } ], "dois": [ { "value": "10.1016/j.physletb.2021.136645" } ], "publication_info": [ { "journal_volume": "822 C", "journal_title": "Physics Letters B", "material": "article", "artid": "136645", "year": 2021 } ], "$schema": "http://repo.scoap3.org/schemas/hep.json", "abstracts": [ { "source": "Elsevier", "value": "Prolate-oblate shape coexistence close to the ground state in the strongly-deformed proton-rich <math><mi>A</mi><mo>\u2248</mo><mn>120</mn></math> nuclei is reported for the first time. One of the four reported bands in $^{119}$Cs, built on a <math><mn>11</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>\u2212</mo></mrow></msup></math> state at 670 keV, consists of nearly degenerate signature partners, and has properties which unequivocally indicate the strongly-coupled <math><mi>\u03c0</mi><msub><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>[</mo><mn>505</mn><mo>]</mo><mn>11</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>\u2212</mo></mrow></msup></math> configuration associated with oblate shape. Together with the decoupled <math><mi>\u03c0</mi><msub><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>[</mo><mn>541</mn><mo>]</mo><mn>3</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>\u2212</mo></mrow></msup></math> band built on the <math><mn>11</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>\u2212</mo></mrow></msup></math> prolate state at 110 keV, for which a half-life of <math><msub><mrow><mi>T</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>=</mo><mn>55</mn><mo>(</mo><mn>5</mn><mo>)</mo><mspace width=\"0.25em\"></mspace><mrow><mi>\u03bc</mi><mtext>s</mtext></mrow></math> has been measured, the new bands bring evidence of shape coexistence at low spin in the proton-rich strongly deformed <math><mi>A</mi><mo>\u2248</mo><mn>120</mn></math> nuclei, a phenomenon predicted since long time, but not yet observed. Calculations using the particle-number conserving cranked shell model and two dimensional tilted axis cranking covariant density functional theory support and well reproduce the observed oblate and prolate coexisting low-energy states in $^{119}$Cs." } ], "imprints": [ { "date": "2021-10-26", "publisher": "Elsevier" } ], "acquisition_source": { "date": "2021-10-26T06:32:59.086565", "source": "Elsevier", "method": "Elsevier", "submission_number": "25232ed0362611ecaa1b7aa32592193b" } }