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稀土区奇A核晕带存在从转动到振动形状演化的直接证据(英文)

周厚兵 黄山 董国香 沈自序 卢慧金 王乐乐 孙小军 许甫荣

周厚兵, 黄山, 董国香, 沈自序, 卢慧金, 王乐乐, 孙小军, 许甫荣. 稀土区奇A核晕带存在从转动到振动形状演化的直接证据(英文)[J]. 原子核物理评论, 2018, 35(3): 243-249. doi: 10.11804/NuclPhysRev.35.03.243
引用本文: 周厚兵, 黄山, 董国香, 沈自序, 卢慧金, 王乐乐, 孙小军, 许甫荣. 稀土区奇A核晕带存在从转动到振动形状演化的直接证据(英文)[J]. 原子核物理评论, 2018, 35(3): 243-249. doi: 10.11804/NuclPhysRev.35.03.243
ZHOU Houbing, HUANG Shan, DONG Guoxiang, SHEN Zixu, LU Huijin, WANG Lele, SUN Xiaojun, XU Furong. Evidence for Rotational to Vibrational Evolution Along the Yrast Line in the Odd-A Rare-earth Nuclei[J]. Nuclear Physics Review, 2018, 35(3): 243-249. doi: 10.11804/NuclPhysRev.35.03.243
Citation: ZHOU Houbing, HUANG Shan, DONG Guoxiang, SHEN Zixu, LU Huijin, WANG Lele, SUN Xiaojun, XU Furong. Evidence for Rotational to Vibrational Evolution Along the Yrast Line in the Odd-A Rare-earth Nuclei[J]. Nuclear Physics Review, 2018, 35(3): 243-249. doi: 10.11804/NuclPhysRev.35.03.243

稀土区奇A核晕带存在从转动到振动形状演化的直接证据(英文)

doi: 10.11804/NuclPhysRev.35.03.243
基金项目: 国家自然科学基金资助项目(11505035,11465005,11505056,11605054,11675266,U1732138,11775057,11765004,11565008);广西自然科学基金资助项目(2017GXNSFAA198160,2015GXNSFDA139004);广西高等学校高水平创新团队及卓越学者计划资助项目
详细信息
  • 中图分类号: O571.2

Evidence for Rotational to Vibrational Evolution Along the Yrast Line in the Odd-A Rare-earth Nuclei

Funds: National Natural Science Foundation of China (11505035, 11465005, 11505056, 11605054, 11675266, U1732138, 11775057, 11765004, 11565008); Natural Science Foundation of Guangxi, China (2017GXNSFAA198160, 2015GXNSFDA139004); Project of Innovative Team and Distinguished Scholar in Institutions of Higher Education of Guangxi, China
  • 摘要: 原子核的形状演化效应是核结构研究的重要基础问题之一。通常认为,A=160质量区的奇A核位于大形变核区域,它们的激发态能谱将呈现出典型的转动激发特征。然而,基于E-GOS曲线方法,发现随着角动量的增加,该质量区奇A核的晕带具有显著地从转动激发演化成为振动激发的形状演化现象。此外,为深入理解原子核形状演化的微观机制,采用Total-Routhian-Surface(TRS)方法针对稀土区的奇A核进行了理论计算,结果表明,165Yb和157Dy同位素在低激发态时具有稳定的长椭形变,当角动量大于0.50 MeV后,核芯的四极形变显著减小并开始产生三轴形变。


    The phase transition of nuclei with increasing angular momentum (or spin) and excitation energy is one of the most fundamental topics of nuclear structure research. The odd-N nuclei with A ≈160 are widely considered belonging to the well-deformed region, and their excitation spectra are energetically favored to exhibit the rotational characteristics. In this work, however, the evidence suggesting that the nuclei changes from rotation to vibration along the yrast lines as a function of spin was found. The simple method, named as E-Gamma Over Spin (E-GOS) curves, would be used to discern the evolution from rotational to vibrational structure in nuclei for various spin ranges. Meanwhile, in order to understand the band structure properties of nuclei, theoretical calculations have been performed for the yrast bands of the odd-A rare-earth nuclei within the framework of the total routhian surface (TRS) model. The TRS plots predict that the 165Yb and 157Dy isotopes have large quadrupole shapes at low spin states. At higher rotational frequency (~ >0.50 MeV), a clear reduction of the quadrupole deformation is indicated by the present results, and the isotopes become rigid in the γ deformation.
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出版历程
  • 收稿日期:  2018-05-23
  • 修回日期:  2018-06-22
  • 刊出日期:  2018-09-20

稀土区奇A核晕带存在从转动到振动形状演化的直接证据(英文)

doi: 10.11804/NuclPhysRev.35.03.243
    基金项目:  国家自然科学基金资助项目(11505035,11465005,11505056,11605054,11675266,U1732138,11775057,11765004,11565008);广西自然科学基金资助项目(2017GXNSFAA198160,2015GXNSFDA139004);广西高等学校高水平创新团队及卓越学者计划资助项目
  • 中图分类号: O571.2

摘要: 原子核的形状演化效应是核结构研究的重要基础问题之一。通常认为,A=160质量区的奇A核位于大形变核区域,它们的激发态能谱将呈现出典型的转动激发特征。然而,基于E-GOS曲线方法,发现随着角动量的增加,该质量区奇A核的晕带具有显著地从转动激发演化成为振动激发的形状演化现象。此外,为深入理解原子核形状演化的微观机制,采用Total-Routhian-Surface(TRS)方法针对稀土区的奇A核进行了理论计算,结果表明,165Yb和157Dy同位素在低激发态时具有稳定的长椭形变,当角动量大于0.50 MeV后,核芯的四极形变显著减小并开始产生三轴形变。


The phase transition of nuclei with increasing angular momentum (or spin) and excitation energy is one of the most fundamental topics of nuclear structure research. The odd-N nuclei with A ≈160 are widely considered belonging to the well-deformed region, and their excitation spectra are energetically favored to exhibit the rotational characteristics. In this work, however, the evidence suggesting that the nuclei changes from rotation to vibration along the yrast lines as a function of spin was found. The simple method, named as E-Gamma Over Spin (E-GOS) curves, would be used to discern the evolution from rotational to vibrational structure in nuclei for various spin ranges. Meanwhile, in order to understand the band structure properties of nuclei, theoretical calculations have been performed for the yrast bands of the odd-A rare-earth nuclei within the framework of the total routhian surface (TRS) model. The TRS plots predict that the 165Yb and 157Dy isotopes have large quadrupole shapes at low spin states. At higher rotational frequency (~ >0.50 MeV), a clear reduction of the quadrupole deformation is indicated by the present results, and the isotopes become rigid in the γ deformation.

English Abstract

周厚兵, 黄山, 董国香, 沈自序, 卢慧金, 王乐乐, 孙小军, 许甫荣. 稀土区奇A核晕带存在从转动到振动形状演化的直接证据(英文)[J]. 原子核物理评论, 2018, 35(3): 243-249. doi: 10.11804/NuclPhysRev.35.03.243
引用本文: 周厚兵, 黄山, 董国香, 沈自序, 卢慧金, 王乐乐, 孙小军, 许甫荣. 稀土区奇A核晕带存在从转动到振动形状演化的直接证据(英文)[J]. 原子核物理评论, 2018, 35(3): 243-249. doi: 10.11804/NuclPhysRev.35.03.243
ZHOU Houbing, HUANG Shan, DONG Guoxiang, SHEN Zixu, LU Huijin, WANG Lele, SUN Xiaojun, XU Furong. Evidence for Rotational to Vibrational Evolution Along the Yrast Line in the Odd-A Rare-earth Nuclei[J]. Nuclear Physics Review, 2018, 35(3): 243-249. doi: 10.11804/NuclPhysRev.35.03.243
Citation: ZHOU Houbing, HUANG Shan, DONG Guoxiang, SHEN Zixu, LU Huijin, WANG Lele, SUN Xiaojun, XU Furong. Evidence for Rotational to Vibrational Evolution Along the Yrast Line in the Odd-A Rare-earth Nuclei[J]. Nuclear Physics Review, 2018, 35(3): 243-249. doi: 10.11804/NuclPhysRev.35.03.243
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