H. Wang , K.Y. Ma , D. Zhao , J.Y. Li , H.Y. Ye , X.J. Zhao , Y.C. Hao , Z. Qiao , J.X. Teng , K.S. Su , X.R. Zhao , Z.H. Zhao , H.C. Zhang , Y.K. Pan , Y.J. Ma , J.B. Lu , Y. Zheng , C.B. Li , T.X. Li , X.G. Wu , Y.Q. Li
{"title":"134Cs中负宇称高自旋态的首次观测和奇奇Cs同位素中可能的手性边界","authors":"H. Wang , K.Y. Ma , D. Zhao , J.Y. Li , H.Y. Ye , X.J. Zhao , Y.C. Hao , Z. Qiao , J.X. Teng , K.S. Su , X.R. Zhao , Z.H. Zhao , H.C. Zhang , Y.K. Pan , Y.J. Ma , J.B. Lu , Y. Zheng , C.B. Li , T.X. Li , X.G. Wu , Y.Q. Li","doi":"10.1016/j.physletb.2025.139710","DOIUrl":null,"url":null,"abstract":"<div><div>Negative-parity high-spin states in neutron-rich cesium isotope <sup>134</sup>Cs are reported for the first time using the reaction <sup>130</sup>Te(<sup>7</sup>Li, 3n)<sup>134</sup>Cs. The previously known level scheme of <sup>134</sup>Cs is considerably extended with the addition of more than 50 new <em>γ</em> transitions. Two negative-parity bands are observed and proposed as pseudospin partner bands with <span><math><mi>π</mi><mo>(</mo><msub><mrow><mi>g</mi></mrow><mrow><mn>7</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>,</mo><msub><mrow><mi>d</mi></mrow><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>)</mo><mo>⊗</mo><mi>ν</mi><msub><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> configurations, supported by particle rotor model calculations. A pair of nearly degenerate positive-parity bands based on <span><math><mi>π</mi><msub><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>⊗</mo><mi>ν</mi><msub><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> configuration are identified and interpreted as chiral doublet bands in <sup>134</sup>Cs, which is the first chiral neutron-rich nucleus in the <span><math><mi>A</mi><mo>≈</mo><mn>130</mn></math></span> mass region. Meanwhile, <sup>134</sup>Cs is also currently the heaviest nucleus with chirality among Cs isotopes, meaning that it may be the boundary of the chiral nuclei in the odd-odd Cs isotopes while approaching <em>N</em> = 82. In addition, the electric dipole transitions linking the positive- and negative-parity bands are observed, suggesting the possible presence of octupole correlations in <sup>134</sup>Cs.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"868 ","pages":"Article 139710"},"PeriodicalIF":4.5000,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"First observation of negative-parity high-spin states in 134Cs and possible boundary of chirality in odd-odd Cs isotopes\",\"authors\":\"H. Wang , K.Y. Ma , D. Zhao , J.Y. Li , H.Y. Ye , X.J. Zhao , Y.C. Hao , Z. Qiao , J.X. Teng , K.S. Su , X.R. Zhao , Z.H. Zhao , H.C. Zhang , Y.K. Pan , Y.J. Ma , J.B. Lu , Y. Zheng , C.B. Li , T.X. Li , X.G. Wu , Y.Q. Li\",\"doi\":\"10.1016/j.physletb.2025.139710\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Negative-parity high-spin states in neutron-rich cesium isotope <sup>134</sup>Cs are reported for the first time using the reaction <sup>130</sup>Te(<sup>7</sup>Li, 3n)<sup>134</sup>Cs. The previously known level scheme of <sup>134</sup>Cs is considerably extended with the addition of more than 50 new <em>γ</em> transitions. Two negative-parity bands are observed and proposed as pseudospin partner bands with <span><math><mi>π</mi><mo>(</mo><msub><mrow><mi>g</mi></mrow><mrow><mn>7</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>,</mo><msub><mrow><mi>d</mi></mrow><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>)</mo><mo>⊗</mo><mi>ν</mi><msub><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> configurations, supported by particle rotor model calculations. A pair of nearly degenerate positive-parity bands based on <span><math><mi>π</mi><msub><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>⊗</mo><mi>ν</mi><msub><mrow><mi>h</mi></mrow><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> configuration are identified and interpreted as chiral doublet bands in <sup>134</sup>Cs, which is the first chiral neutron-rich nucleus in the <span><math><mi>A</mi><mo>≈</mo><mn>130</mn></math></span> mass region. Meanwhile, <sup>134</sup>Cs is also currently the heaviest nucleus with chirality among Cs isotopes, meaning that it may be the boundary of the chiral nuclei in the odd-odd Cs isotopes while approaching <em>N</em> = 82. In addition, the electric dipole transitions linking the positive- and negative-parity bands are observed, suggesting the possible presence of octupole correlations in <sup>134</sup>Cs.</div></div>\",\"PeriodicalId\":20162,\"journal\":{\"name\":\"Physics Letters B\",\"volume\":\"868 \",\"pages\":\"Article 139710\"},\"PeriodicalIF\":4.5000,\"publicationDate\":\"2025-07-07\",\"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/S037026932500471X\",\"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/S037026932500471X","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}
First observation of negative-parity high-spin states in 134Cs and possible boundary of chirality in odd-odd Cs isotopes
Negative-parity high-spin states in neutron-rich cesium isotope 134Cs are reported for the first time using the reaction 130Te(7Li, 3n)134Cs. The previously known level scheme of 134Cs is considerably extended with the addition of more than 50 new γ transitions. Two negative-parity bands are observed and proposed as pseudospin partner bands with configurations, supported by particle rotor model calculations. A pair of nearly degenerate positive-parity bands based on configuration are identified and interpreted as chiral doublet bands in 134Cs, which is the first chiral neutron-rich nucleus in the mass region. Meanwhile, 134Cs is also currently the heaviest nucleus with chirality among Cs isotopes, meaning that it may be the boundary of the chiral nuclei in the odd-odd Cs isotopes while approaching N = 82. In addition, the electric dipole transitions linking the positive- and negative-parity bands are observed, suggesting the possible presence of octupole correlations in 134Cs.
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.