2022 Fiscal Year Annual Research Report
An advanced in-trap deflector for background-free nuclear mass measurements
| Project/Area Number |
21K13951
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
Rosenbusch Marco 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 特任助教 (50790945)
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| Project Period (FY) |
2021-04-01 – 2023-03-31
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| Keywords | Nuclear Structure / Nuclear Astrophysics / Ion Traps / Ion Manipulation / MRTOF-MS / Isotope Separation / Background Reduction |
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| Outline of Annual Research Achievements |
The new project for an in-MRTOF deflection system has been completed with great success and applied to different MRTOF-MS systems. In FY2020, before the installation, the required voltage pulse sequence has been developed [M. Rosenbusch et al., NIM A 1047, 167824 (2022)]). Result: Discovery of a low N=34 two-neutron shell gap in Ti and V isotopes [S. Iimura, M. Rosenbusch et al., PRL 130, 012501 (2023)].
The construction took place FY2020/2021. Tests were performed using molecules ionized in helium. The molecules have been forwarded to the MRTOF-MS. Using the developed pulse sequence, a single mass unit was transmitted to the TOF detector while all other have been removed. New programming allowed for multiple mass units (e.g. A=74, A=75, and A=76) simultaneously while excluding all others.
In FY2021/FY2022, this new system was applied for experiment RIBF199 and RIBF202 (see RIKEN RIBF). Result: Masses of 73Ni and 74Ni were measured at the same time, and also 74Ni and 75Ni (publication FY2023).
In FY2021 two other deflector systems have been installed in MRTOF-MS systems. In FY2021 the in-MRTOF deflector at the GARIS-II enabled taking data on the superheavy isotopes 257Db [RIKEN Accel. Prog. Rep. 55, 6 (2022)] and also 258Db [RIKEN Accel. Prog. Rep. 55, 7 (2022)].
During FY2022, the in-MRTOF deflector allowed to solve the problem of the unknown charge states for different chemical elements. A fission source (10kBq, Am) produced a large variety of radioisotopes. Ions have been selected and the dominant charge state could be revealed for upcoming accelerator experiments.
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[Journal Article] The new MRTOF mass spectrograph following the ZeroDegree spectrometer at RIKEN’s RIBF facility2023
Author(s)
Rosenbusch M.、Wada M.、Chen S.、Takamine A.、Iimura S.、Hou D.、Xian W.、Yan S.、Schury P.、Hirayama Y.、Ito Y.、Ishiyama H.、Kimura S.、Kojima T.、Lee J.、Liu J.、Michimasa S.、Miyatake H.、Moon J.Y.、Mukai M.、Naimi S.、Nishimura S.、Niwase T.、Sonoda T.、Watanabe Y.X.、Wollnik H.
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Journal Title
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume: 1047
Pages: 167824～167824
DOI
Peer Reviewed / Int'l Joint Research
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