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論文

Construction of a new multi-reflection time-of-flight mass spectrograph at RAON

Moon, J. Y.*; 伊藤 由太; 他13名*

Journal of the Korean Physical Society, 87(5), p.640 - 648, 2025/09

https://doi.org/10.1007/s40042-024-01237-x
 被引用回数：2 パーセンタイル：38.77(Physics, Multidisciplinary)

A new large-scale heavy-ion accelerator complex, RAON (Rare isotope Accelerator complex for ON-line experiments), in Korea has implemented the state-of-art device, multi-reflection time-of-flight mass spectrometer (MRTOF-MS) for the mass spectrometry of the exotic nuclei. Using the multi-reflections of ions between a pair of grid-free mirror electrodes and therefore extending the fly length, it can achieve the incredibly high mass resolving power of within a short measurement time of $$<$$ 10 ms, providing the nuclear mass of the exotic nuclei with a high-precision level of sub-ppm. The device is coupled to one of the beamlines in the ISOL experimental hall, ready for participating in the longstanding topics of nuclear structure in the outskirts of the nuclear chart and nucleosynthesis of heavy elements in explosive astrophysical environments. The exclusively high mass resolving power is also advantageous for reducing the isobaric contaminants that rare isotope ion beam facilities suffer from. In this paper, we present a summary of the construction and current performance of the RAON MRTOF-MS.

論文

超重核研究のための多重反射型飛行時間測定式質量分光器

Schury, P.*; 伊藤 由太; 和田 道治*

日本物理学会誌, 80(2), p.72 - 78, 2025/02

https://doi.org/10.11316/butsuri.80.2_72

多重反射型飛行時間測定質量分析装置は、近年、超重核の研究において非常に有用となっている。この装置は各イオンを効率的に利用し、その動作は飛行時間(TOF)イオン衝突検出器に崩壊検出器を組み込むことを容易に実現できる。このようにして、TOF-崩壊相関を測定することで、低収量放射性イオンを安定分子イオンや雑音カウントから明確に区別することができる。この技術は最終的に113番元素Nh同位体や115番元素Mc同位体のような極めて低収量の原子核の研究にも応用可能となるだろう。

論文

Comprehensive mass measurement study of $$^{252}$$Cf fission fragments with MRTOF-MS and detailed study of masses of neutron-rich Ce isotopes

木村 創大*; 伊藤 由太; 他8名*

Physical Review C, 110(4), p.045810_1 - 045810_9, 2024/10

https://doi.org/10.1103/PhysRevC.110.045810
 被引用回数：6 パーセンタイル：82.41(Physics, Nuclear)

We report the mass measurements of neutron-rich isotopes produced via spontaneous fission of $$^{252}$$Cf using a multireflection time-of-flight mass spectrograph. The mass of $$^{155}$$Ce is determined experimentally for the first time. A discrepancy between the experimental and literature values was found for the mass of $$^{127}$$Sb, which was previously deduced through indirect measurements. In comparison with several theoretical predictions, both the values and the trend of the mass excesses of $$^{152sim155}$$Ce cannot be consistently explained. The wide-range and simultaneous mass measurements of the multireflection time-of-flight mass spectrograph enable us to crosscheck the existing mass data, and the conflict between the measured time-of-flight ratio and the extracted mass would imply the necessity of re-examining them.

論文

Mass measurements of neutron-rich $$A approx 90$$ nuclei constrain element abundances

Xian, W.*; 伊藤 由太; 他30名*

Physical Review C, 109(3), p.035804_1 - 035804_10, 2024/03

https://doi.org/10.1103/PhysRevC.109.035804
 被引用回数：7 パーセンタイル：86.26(Physics, Nuclear)

Atomic masses of the neutron-rich isotopes $$^{83,84}$$Ga, $$^{82sim86}$$Ge, $$^{82sim89}$$As, $$^{82,84sim91}$$Se, $$^{85,86,89sim92}$$Br, $$^{89,91,92}$$Kr, and $$^{91}$$Rb have been measured with high precision and accuracy using the multi-reflection time-of-flight mass spectrograph at the RIBF facility. The masses of $$^{88,89}$$As were measured for the first time and the mass uncertainties of $$^{86}$$Ge and $$^{90,91}$$Se were significantly reduced from several hundred keV to below the 10 keV scale. Investigation of shell evolution and potential subshell closures are proceeded by analysis of two-neutron separation energy systematics. As a result of the precise mass measurements, no prominent change on the slope of the two-neutron separation energy beyond $$N=56$$ is observed in Se isotopes, indicating the subshell closure effect at $$N=56$$ of Se does not exist. Also, various leading mass models are compared with the measurements. The impact of the more precisely known data on r-process nucleosynthesis calculations is investigated in light of these new mass measurements, showing a remarkable reduction of reaction-rate uncertainties.

論文

First direct mass measurement for neutron-rich $$^{112}$$Mo with the new ZD-MRTOF mass spectrograph system

Hou, D. S.*; 伊藤 由太; 他30名*

Physical Review C, 108(5), p.054312_1 - 054312_10, 2023/11

https://doi.org/10.1103/PhysRevC.108.054312
 被引用回数：9 パーセンタイル：79.59(Physics, Nuclear)

理化学研究所RIビームファクトリーのZeroDegree多重反射型飛行時間質量分析装置(ZDMRTOF-MS)を用いて、$$^{111,113}$$Ag、$$^{111-113}$$Pd、$$^{111-113}$$Rh、$$^{111-113}$$Ru、$$^{111,112}$$Moの原子質量を測定した。ほとんどのケースにおいて、我々の結果は既存の実験データやAME2020で評価された質量と良好な一致を示した。本結果から、$$^{112}$$Moまでは、N = 70における調和振動子ギャップに対応する安定化殻効果は存在しないと結論付けた。

論文

The New MRTOF mass spectrograph following the ZeroDegree spectrometer at RIKEN's RIBF facility

Rosenbusch, M.*; 伊藤 由太; 他24名*

Nuclear Instruments and Methods in Physics Research A, 1047, p.167824_1 - 167824_12, 2023/02

https://doi.org/10.1016/j.nima.2022.167824
 被引用回数：30 パーセンタイル：96.51(Instruments & Instrumentation)

理化学研究所RIBFのZeroDegreeスペクトロメーター後方に新しい多重反射型飛行時間測定質量分析装置を設置した。パルスドリフトチューブ技術を用いてイオンの運動エネルギーを広範囲に変化させることで、システムの分散関数を直接的に評価し、静電ミラーに印加する電圧を最適化した。これにより、わずか12.5ミリ秒の全飛行時間で10$$^{6}$$の質量分解能を達成し、短寿命低エネルギー核異性体の研究を可能にした。

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