First Observation of the Low-lying Isomer State of <sup>101</sup>In

LIU Junhao; ZHANG Yuhu; XING Yuanming; XU Xing; SHUAI Peng; WANG Meng; TU Xiaolin; ZHANG Peng; ZENG Qi; CHEN Ruijiu; CHEN Xiangcheng; FU Chaoyi; LI Hongfu; SUN Mingze; YAN Xinliang; GAO Bingshui; YANG Jiancheng; YUAN Youjin; Yu. A. Litvinov; K. Blaum; S. Naimi; ZHOU Xiaohong; XU Hushan

doi:10.11804/NuclPhysRev.35.04.439

Isochronous mass spectrometry has been applied to ¹¹²Sn projectile fragments at the HIRFL-CSR facility in Lanzhou. To produce short-lived nuclei of interest, we used projectile fragmentation of ¹¹²Sn³⁵⁺ primary beams in a~10 mm thick ⁹Be production target. The fragments were selected and analyzed by RIBLL2 and injected into the experimental storage ring(CSRe) every 25 s. To measure revolution times of stored ions,we used a Time-Of-Flight detector installed in CSRe. A new particle identification method was developed to distinguish ions on the measured revolution time spectrum for each injection. Based on this method, the shifts of the revolution time due to instable dipole magnet fields can be corrected and the ground and isomeric states of ¹⁰¹In have been well-resolved. The measured excitation energy is consistent with the theoretical value in the error range of 112 keV. The lifetime of the isomeric states of ¹⁰¹In is more than 200 μs.

First Observation of the Low-lying Isomer State of ¹⁰¹In

1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;

2. University of Chinese Academy of Sciences, Beijing 100049, China;

3. University of Science and Technology of China, Hefei 230026, China;

4. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291 Germany;

5. Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg, 69117 Germany;

6. RIKEN Nishina Center, Wako, Saitama 351-0198, Japan

Funds: National Natural Science Foundation of China(U1232208, U1432125, 11605248, 11605252, 11605249, 11605267, 11575112, 11575007); National Basic Research Program of China(2018YFA0404401, 2016YFA0400504); European Research Council(ERCCG 682841 "ASTRUm")

Received Date: 2018-09-05

Rev Recd Date: 2018-11-02

Publish Date: 2020-05-03

Key words:

Abstract: Isochronous mass spectrometry has been applied to ¹¹²Sn projectile fragments at the HIRFL-CSR facility in Lanzhou. To produce short-lived nuclei of interest, we used projectile fragmentation of ¹¹²Sn³⁵⁺ primary beams in a~10 mm thick ⁹Be production target. The fragments were selected and analyzed by RIBLL2 and injected into the experimental storage ring(CSRe) every 25 s. To measure revolution times of stored ions,we used a Time-Of-Flight detector installed in CSRe. A new particle identification method was developed to distinguish ions on the measured revolution time spectrum for each injection. Based on this method, the shifts of the revolution time due to instable dipole magnet fields can be corrected and the ground and isomeric states of ¹⁰¹In have been well-resolved. The measured excitation energy is consistent with the theoretical value in the error range of 112 keV. The lifetime of the isomeric states of ¹⁰¹In is more than 200 μs.

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First Observation of the Low-lying Isomer State of ¹⁰¹In

doi: 10.11804/NuclPhysRev.35.04.439

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First Observation of the Low-lying Isomer State of ¹⁰¹In

doi: 10.11804/NuclPhysRev.35.04.439

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First Observation of the Low-lying Isomer State of 101In

doi: 10.11804/NuclPhysRev.35.04.439

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

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First Observation of the Low-lying Isomer State of 101In

doi: 10.11804/NuclPhysRev.35.04.439

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First Observation of the Low-lying Isomer State of ¹⁰¹In

First Observation of the Low-lying Isomer State of ¹⁰¹In