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Article Navigation >  Nuclear Physics Review  > 2019  >  36(3): 294-304

GE Zhuang, WANG Qian, WANG Meng, UESAKA Tomohiro. Study of Mass-measurement Method for N=Z Nuclei with Isochronous Mass Spectrometry[J]. Nuclear Physics Review, 2019, 36(3): 294-304. doi: 10.11804/NuclPhysRev.36.03.294
Citation: GE Zhuang, WANG Qian, WANG Meng, UESAKA Tomohiro. Study of Mass-measurement Method for N=Z Nuclei with Isochronous Mass Spectrometry[J]. Nuclear Physics Review, 2019, 36(3): 294-304. doi: 10.11804/NuclPhysRev.36.03.294
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Study of Mass-measurement Method for N=Z Nuclei with Isochronous Mass Spectrometry

doi: 10.11804/NuclPhysRev.36.03.294
  • 1.

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

  • 2.

    School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China;

  • 3.

    RIKEN, Wako 351-0198, Japan

Funds:  National Natural Science Foundation of China(11605248, 11605249, 11605267, 11805032)
  • Received Date: 2019-03-30
  • Rev Recd Date: 2019-04-20
  • Publish Date: 2019-09-20
  • Nuclear mass data of N=Z nuclei is crucial for the investigation of the rp-and the νp-processes. In addition, access to the nuclei on the N=Z line will help us solve key questions relating to many open questions of nuclear structure. Isochronous mass spectrometry (IMS) combined with a fragment separator is a very fast, efficient and high resolution mass measurement tool. Since the m/q values of the N=Z nuclei are very close, the current storage ring mass spectrometers CSRe/IMP and ESR/GSI cannot realize the identification of the N=Z ions of different species via revolution time spectrum, so it is impossible to realize mass measurements on them. An IMS using a newly constructed storage ring named the ‘Rare-RI Ring’ (R3) has been implemented at the RIKEN Nishina Center to determine the masses of short-lived rare nuclei with a relative precision of the order of 10-6. With the R3 operated as an IMS coupled to the high-resolution beam-line BigRIPS employed as a fragment separator, high-resolution particle identification of the N=Z nuclei on an event-by-event basis with the beam-line before their injection to R3 makes the mass measurements possible. Monte Carlo simulation studies of beam tracking, high-resolution particle identification and selection of the secondary beams have been carried out with a dedicated ion-optics design. The results show that the revolution time of all the N=Z nuclei are independent of momentum dispersion in the storage ring when we set one species of N=Z nucleus in an isochronous condition. The mass calibration method for the N=Z nuclei has also been discussed in this report based on the simulation.
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Study of Mass-measurement Method for N=Z Nuclei with Isochronous Mass Spectrometry

doi: 10.11804/NuclPhysRev.36.03.294
  • 1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
  • 2. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
  • 3. RIKEN, Wako 351-0198, Japan
Funds:  National Natural Science Foundation of China(11605248, 11605249, 11605267, 11805032)
  • Received Date: 2019-03-30
  • Rev Recd Date: 2019-04-20
  • Publish Date: 2019-09-20

Abstract: Nuclear mass data of N=Z nuclei is crucial for the investigation of the rp-and the νp-processes. In addition, access to the nuclei on the N=Z line will help us solve key questions relating to many open questions of nuclear structure. Isochronous mass spectrometry (IMS) combined with a fragment separator is a very fast, efficient and high resolution mass measurement tool. Since the m/q values of the N=Z nuclei are very close, the current storage ring mass spectrometers CSRe/IMP and ESR/GSI cannot realize the identification of the N=Z ions of different species via revolution time spectrum, so it is impossible to realize mass measurements on them. An IMS using a newly constructed storage ring named the ‘Rare-RI Ring’ (R3) has been implemented at the RIKEN Nishina Center to determine the masses of short-lived rare nuclei with a relative precision of the order of 10-6. With the R3 operated as an IMS coupled to the high-resolution beam-line BigRIPS employed as a fragment separator, high-resolution particle identification of the N=Z nuclei on an event-by-event basis with the beam-line before their injection to R3 makes the mass measurements possible. Monte Carlo simulation studies of beam tracking, high-resolution particle identification and selection of the secondary beams have been carried out with a dedicated ion-optics design. The results show that the revolution time of all the N=Z nuclei are independent of momentum dispersion in the storage ring when we set one species of N=Z nucleus in an isochronous condition. The mass calibration method for the N=Z nuclei has also been discussed in this report based on the simulation.

GE Zhuang, WANG Qian, WANG Meng, UESAKA Tomohiro. Study of Mass-measurement Method for N=Z Nuclei with Isochronous Mass Spectrometry[J]. Nuclear Physics Review, 2019, 36(3): 294-304. doi: 10.11804/NuclPhysRev.36.03.294
Citation: GE Zhuang, WANG Qian, WANG Meng, UESAKA Tomohiro. Study of Mass-measurement Method for N=Z Nuclei with Isochronous Mass Spectrometry[J]. Nuclear Physics Review, 2019, 36(3): 294-304. doi: 10.11804/NuclPhysRev.36.03.294
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