Mapping of a New Deformation Region Around 
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Michimasa, S.; Kobayashi, Mariko; Kiyokawa, Yasushi; Ota, S.; Yokoyama, R.; Nishimura, D.; Ahn, D. S.; Baba, H.; Berg, G.P.A.; Dozono, M.; Fukuda, N.; Furuno, T.; Ideguchi, E.; Inabe, N.; Kawabata, T.; Kawase, S.; Kisamori, K.; Kobayashi, K.; Kubo, T.; Kubota, Yuki; Lee, C. S.; Matsushita, M.; Miya, Hiroyuki; Mizukami, A.; Nagakura, Hiroki; Oikawa, Hiroyuki; Sakai, H.; Shimizu, Y.; Stolz, A.; Suzuki, Hiroshi; Takaki, M.; Takeda, Hiroyuki; Takeuchi, Satoshi; Tokieda, H.; Uesaka, T.; Yako, K.; Yamaguchi, Yoshitaka; Yanagisawa, Y.; Yoshida, Kôichi; Shimoura, S.

doi:10.1103/physrevlett.125.122501

Cited by 35 publications

(22 citation statements)

References 66 publications

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“…Nevertheless, the commissioning was highly successful for the study of nuclear masses with more than 70 atomic masses measured during the campaign. Around neutron-rich Ti and V iso-topes, our results include isotopes from Sc to Fe with 55 Sc, 58 Ti, and 59 V being the most exotic ones measured in this region, which improve nuclear masses recently measured using the TOF-Bρ method at NSCL [77] and RIBF [16] being the forefront of nuclear mass studies in this region. In the neutron-rich region above Ni, nuclides have been studied reaching from Ga to Kr with 84 Ga, 86 Ge, 89 As, and 91 Se as most exotic species.…”

Section: Online Experimentsmentioning

confidence: 53%

“…In particular for astrophysical nucleosynthesis, RIBF dominated the production of nuclei near the N = 82 shell closure and also the rare-earth region [10], while further developments to produce nuclei near the N = 126 shell closure (see KISS project of KEK [11,12]) are ongoing and expanding its territory. In the recent years the topic of precision atomic mass measurements has quickly gained in popularity and the facility now employs magnetic storage ring [13,14], a Bρ timeof-flight mass spectrometer [15,16], and multi-reflection time-of-flight mass spectrographs (MRTOF-MS) [17,18]. Recently a new state-of-the-art MRTOF apparatus [19] referred to as ZeroDegree-MRTOF (ZD-MRTOF) system has become operational at RIBF.…”

Section: Introductionmentioning

confidence: 99%

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

Rosenbusch¹,

Wada²,

S.³

et al. 2021

Preprint

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Section: Online Experimentsmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

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

Rosenbusch¹,

Wada²,

S.³

et al. 2021

Preprint

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“…Also in this case, the measured lifetimes favor M2 decays, whereas again E 3 cannot be fully excluded. Recently, isomeric states have also been reported in another experiment focused on measuring the mass of nuclei in the N = 40 island of inversion [20]. In that study, the transitions at 413 and 580 keV have been observed, albeit with a larger relative intensity for the 580-keV γ ray.…”

Section: Discussionmentioning

confidence: 79%

“…The large background of the work of Ref. [20] also prevented the extraction of consistent lifetimes.…”

Section: Discussionmentioning

confidence: 99%

Isomeric states in neutron-rich nuclei near N=40

Wimmer¹,

Recchia²,

Lenzi³

et al. 2021

Phys. Rev. C

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“…Two-neutron separation energy of the neutron-rich nuclei on Ca, Ti, Pm, Sm isotopic chains given by different models. The red stars and green dots represent the experimental data from AME2016 and the latest measurement from Refs [45,46]…”

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confidence: 99%

Machine learning the nuclear mass

Gao¹,

Wang²,

Lü³

et al. 2021

Preprint

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Background:The masses of about 2500 nuclei have been measured experimentally, however more than 7000 isotopes are predicted to exist in the nuclear landscape from H (Z=1) to Og (Z=118) based on various theoretical calculations. Exploring the mass of the remains is a hot topic in nuclear physics. Machine learning has been served as a powerful tool in learning complex representations of big data in many fields. Purpose: We use Light Gradient Boosting Machine (LightGBM) which is a highly efficient machine learning algorithm to predict the masses of unknown nuclei and to explore the nuclear landscape in neutron-rich side from learning the measured nuclear masses. Methods: Several characteristic quantities (e.g., mass number, proton number) are fed into LightGBM algorithm to mimic the patterns of the residual δ(Z, A) between the experimental binding energy and the theoretical one given by the liquid-drop model (LDM), Duflo-Zucker (DZ) mass model, finite-range droplet model (FRDM), as well as the Weizsäcker-Skyrme (WS4) model, so as to refine these mass models. Results: By using the experimental data of 80 percent of known nuclei as the training dataset, the root mean square deviation (RMSD) between the predicted and the experimental binding energy of the remaining 20% is about 0.234±0.022 MeV, 0.213±0.018 MeV, 0.170±0.011 MeV, and 0.222±0.016 MeV for the LightGBM-refined LDM, DZ, WS4, and FRDM models, respectively. These values are of about 90%, 65%, 40%, and 60% smaller than the corresponding origin mass models. The RMSD for 66 newly measured nuclei that appeared in AME2020 is also significantly improved on the same foot. One-neutron and two-neutron separation energies predicted by these refined models are in consistence with several theoretical predictions based on various physical models. In addition, the two-neutron separation energy of several newly measured nuclei (e.g., some isotopes of Ca, Ti, Pm, Sm) predicted with LightGBM-refined mass models are also in good agreement with the latest experimental data. Conclusions: LightGBM can be used to refine theoretical nuclear mass models so as to predict the binding energy of unknown nuclei. Moreover, the correlation between the input characteristic quantities and the output can be interpreted by SHapley Additive exPlanations (SHAP, a popular explainable artificial intelligence tool), this may provide new insights on developing theoretical nuclear mass models.

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Mapping of a New Deformation Region Around Ti62

Cited by 35 publications

References 66 publications

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

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

Isomeric states in neutron-rich nuclei near N=40

Machine learning the nuclear mass

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