B. Moon , W. Korten , K. Wimmer , P. Doornenbal , T.R. Rodríguez , N. Aoi , H. Baba , F. Browne , C. Campbell , S. Chen , H. Crawford , H. de Witte , C. Fransen , H. Hess , E. Ideguchi , S. Iwazaki , J. Kim , N. Kitamura , A. Kohda , T. Koiwai , Y. Yamamoto
{"title":"通过高分辨率束内γ射线光谱探究富中子锆核的三轴形变","authors":"B. Moon , W. Korten , K. Wimmer , P. Doornenbal , T.R. Rodríguez , N. Aoi , H. Baba , F. Browne , C. Campbell , S. Chen , H. Crawford , H. de Witte , C. Fransen , H. Hess , E. Ideguchi , S. Iwazaki , J. Kim , N. Kitamura , A. Kohda , T. Koiwai , Y. Yamamoto","doi":"10.1016/j.physletb.2024.139047","DOIUrl":null,"url":null,"abstract":"<div><div>Lifetimes of excited states in the very exotic nuclides <sup>108</sup>Zr<sub>68</sub> and <sup>110</sup>Zr<sub>70</sub> were measured for the first time applying high-resolution in-beam <em>γ</em>-ray spectroscopy at relativistic energies. The experiment was carried out at the Radioactive Isotope Beam Factory in RIKEN, using nucleon removal reactions of radioactive Nb ions to produce <sup>108</sup>Zr and <sup>110</sup>Zr. Emitted <em>γ</em> rays from the excited states were measured by the High-resolution Cluster Array at RIBF (HiCARI) and lifetimes were extracted from the observed line shapes caused by relativistic Doppler-shift effects. In addition to the new lifetime information, the precision of the <span><math><mi>E</mi><mo>(</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo></math></span> and <span><math><msub><mrow><mi>R</mi></mrow><mrow><mn>4</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>=</mo><mi>E</mi><mo>(</mo><msubsup><mrow><mn>4</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo><mo>/</mo><mi>E</mi><mo>(</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo></math></span> values of <sup>110</sup>Zr could be significantly improved. The low-lying <span><math><msubsup><mrow><mn>2</mn></mrow><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msubsup></math></span> states in both nuclei are also newly observed, which are indicative of the triaxiality. The various physical quantities were compared with theoretical models to investigate the collectivity in Zr isotopes towards <span><math><mi>N</mi><mo>=</mo><mn>70</mn></math></span>. Together the experimental and theoretical results point at a reduction of the axial deformation while triaxial collectivity increases.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"858 ","pages":"Article 139047"},"PeriodicalIF":4.3000,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy\",\"authors\":\"B. Moon , W. Korten , K. Wimmer , P. Doornenbal , T.R. Rodríguez , N. Aoi , H. Baba , F. Browne , C. Campbell , S. Chen , H. Crawford , H. de Witte , C. Fransen , H. Hess , E. Ideguchi , S. Iwazaki , J. Kim , N. Kitamura , A. Kohda , T. Koiwai , Y. Yamamoto\",\"doi\":\"10.1016/j.physletb.2024.139047\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Lifetimes of excited states in the very exotic nuclides <sup>108</sup>Zr<sub>68</sub> and <sup>110</sup>Zr<sub>70</sub> were measured for the first time applying high-resolution in-beam <em>γ</em>-ray spectroscopy at relativistic energies. The experiment was carried out at the Radioactive Isotope Beam Factory in RIKEN, using nucleon removal reactions of radioactive Nb ions to produce <sup>108</sup>Zr and <sup>110</sup>Zr. Emitted <em>γ</em> rays from the excited states were measured by the High-resolution Cluster Array at RIBF (HiCARI) and lifetimes were extracted from the observed line shapes caused by relativistic Doppler-shift effects. In addition to the new lifetime information, the precision of the <span><math><mi>E</mi><mo>(</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo></math></span> and <span><math><msub><mrow><mi>R</mi></mrow><mrow><mn>4</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>=</mo><mi>E</mi><mo>(</mo><msubsup><mrow><mn>4</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo><mo>/</mo><mi>E</mi><mo>(</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo></math></span> values of <sup>110</sup>Zr could be significantly improved. The low-lying <span><math><msubsup><mrow><mn>2</mn></mrow><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msubsup></math></span> states in both nuclei are also newly observed, which are indicative of the triaxiality. The various physical quantities were compared with theoretical models to investigate the collectivity in Zr isotopes towards <span><math><mi>N</mi><mo>=</mo><mn>70</mn></math></span>. Together the experimental and theoretical results point at a reduction of the axial deformation while triaxial collectivity increases.</div></div>\",\"PeriodicalId\":20162,\"journal\":{\"name\":\"Physics Letters B\",\"volume\":\"858 \",\"pages\":\"Article 139047\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2024-10-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physics Letters B\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0370269324006051\",\"RegionNum\":2,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics Letters B","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0370269324006051","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy
Lifetimes of excited states in the very exotic nuclides 108Zr68 and 110Zr70 were measured for the first time applying high-resolution in-beam γ-ray spectroscopy at relativistic energies. The experiment was carried out at the Radioactive Isotope Beam Factory in RIKEN, using nucleon removal reactions of radioactive Nb ions to produce 108Zr and 110Zr. Emitted γ rays from the excited states were measured by the High-resolution Cluster Array at RIBF (HiCARI) and lifetimes were extracted from the observed line shapes caused by relativistic Doppler-shift effects. In addition to the new lifetime information, the precision of the and values of 110Zr could be significantly improved. The low-lying states in both nuclei are also newly observed, which are indicative of the triaxiality. The various physical quantities were compared with theoretical models to investigate the collectivity in Zr isotopes towards . Together the experimental and theoretical results point at a reduction of the axial deformation while triaxial collectivity increases.
期刊介绍:
Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.