Lifetimes of low-lying excited states in the bands of the neutron-deficient osmium isotopes $^{169,171,173}$Os have been measured for the first time using the recoil-distance Doppler shift and recoil-isomer tagging techniques. An unusually low value is observed for the ratio in $^{169}$Os, similar to the “anomalously” low values of the ratio previously observed in several transitional rare-earth nuclides with even numbers of neutrons and protons, including the neighbouring $^{168,170}$Os. Furthermore, the evolution of with increasing neutron number in the odd-mass isotopic chain $^{169,171,173}$Os is observed to follow the same trend as observed previously in the even-even Os isotopes. These findings indicate that the possible quantum phase transition from a seniority conserving structure to a collective regime as a function of neutron number suggested for the even-even systems is maintained in these odd-mass osmium nuclei, with the odd valence neutron merely acting as a “spectator”. As for the even-even nuclei, the phenomenon is highly unexpected for nuclei that are not situated near closed shells.
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Sweden" } ], "surname": "Doncel", "given_names": "M.", "full_name": "Doncel, M." }, { "affiliations": [ { "country": "Sweden", "value": "KTH Royal Institute of Technology, Stockholm, Sweden" } ], "surname": "Aktas", "given_names": "\u00d6.", "full_name": "Aktas, \u00d6." }, { "affiliations": [ { "country": "Sweden", "value": "KTH Royal Institute of Technology, Stockholm, Sweden" }, { "country": "Turkey", "value": "Department of Physics, Faculty of Science, Istanbul University, Istanbul, Turkey" } ], "surname": "Ertoprak", "given_names": "A.", "full_name": "Ertoprak, A." }, { "affiliations": [ { "country": "Sweden", "value": "KTH Royal Institute of Technology, Stockholm, Sweden" } ], "surname": "Liotta", "given_names": "R.", "full_name": "Liotta, R." }, { "orcid": "0000-0002-1406-5695", "affiliations": [ { "country": "Sweden", "value": "KTH Royal Institute of Technology, Stockholm, Sweden" } ], "surname": "Qi", "given_names": "C.", "full_name": "Qi, C." }, { "orcid": 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"Lifetime measurements of excited states in Os: Persistence of anomalous ( 2) Ratios in Transitional Rare Earth Nuclei in the Presence of a Decoupled Valence Neutron" } ], "collections": [ { "primary": "Physics Letters B" } ], "dois": [ { "value": "10.1016/j.physletb.2021.136527" } ], "publication_info": [ { "journal_volume": "820 C", "journal_title": "Physics Letters B", "material": "article", "artid": "136527", "year": 2021 } ], "$schema": "http://repo.scoap3.org/schemas/hep.json", "abstracts": [ { "source": "Elsevier", "value": "Lifetimes of low-lying excited states in the <math><mi>\u03bd</mi><msub><mrow><mi>i</mi></mrow><mrow><mn>13</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup></mrow></msub></math> bands of the neutron-deficient osmium isotopes $^{169,171,173}$Os have been measured for the first time using the recoil-distance Doppler shift and recoil-isomer tagging techniques. An unusually low value is observed for the ratio <math><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>;</mo><mn>21</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>\u2192</mo><mn>17</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>)</mo><mo>/</mo><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>;</mo><mn>17</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>\u2192</mo><mn>13</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>)</mo></math> in $^{169}$Os, similar to the \u201canomalously\u201d low values of the ratio <math><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mrow><mn>4</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>\u2192</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo><mo>/</mo><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>\u2192</mo><msubsup><mrow><mn>0</mn></mrow><mrow><mi>gs</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo></math> previously observed in several transitional rare-earth nuclides with even numbers of neutrons and protons, including the neighbouring $^{168,170}$Os. Furthermore, the evolution of <math><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>;</mo><mn>21</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>\u2192</mo><mn>17</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>)</mo><mo>/</mo><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>;</mo><mn>17</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>\u2192</mo><mn>13</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>)</mo></math> with increasing neutron number in the odd-mass isotopic chain $^{169,171,173}$Os is observed to follow the same trend as observed previously in the even-even Os isotopes. These findings indicate that the possible quantum phase transition from a seniority conserving structure to a collective regime as a function of neutron number suggested for the even-even systems is maintained in these odd-mass osmium nuclei, with the odd valence neutron merely acting as a \u201cspectator\u201d. As for the even-even nuclei, the phenomenon is highly unexpected for nuclei that are not situated near closed shells." } ], "imprints": [ { "date": "2021-07-22", "publisher": "Elsevier" } ], "acquisition_source": { "date": "2021-10-07T18:30:39.812224", "source": "Elsevier", "method": "Elsevier", "submission_number": "947becec279c11ecbd5e2e123689e85f" } }