Nuclear Structure Research Group

Stuff

Research Areas

Far-unstable RIs (radioactive isotopes), whose proton/neutron ratios differ significantly from those of naturally-occurring stable nuclei, have been shown to exhibit unique nuclear structures and properties, and their structural studies are one of the central subjects in nuclear physics. The research group has been conducting physics research based on various nuclear spectroscopic techniques, such as β-ray spectroscopy (β-NMR, μSR, etc.), γ-ray spectroscopy (γ-TDPAD, Mössbauer spectroscopy, etc), laser spectroscopy, and TOF mass spectroscopy. In particular, the group is working on the development of the device to control RI spins and the universal low-energy RI-beam device, SLOWRI, aiming at new experimental research using the unique RI beams produced.

Research Subject

1. Production of spin-oriented RI beams and its application to the nuclear-moment measurements of unstable nuclei
2. RIPS upgrade and development of highly polarized slow RI beams
3. Fundamental physics: study of symmetry
4. Condensed matter studies using radioactive nuclear probe

List of Selected Publications

1. Ishibashi, Y., Gladkov, A., Ichikawa, Y., Takamine, A., Nishibata, H., Sato, T., Yamazaki, H., Abe, T., Daugas, J. M., Egami, T., Fujita, T., Georgiev, G., Imamura, K., Kawaguchi, T., Kobayashi, W., Nakamura, Y., Ozawa, A., Sanjo, M., Shimizu, N., Tominaga, D., Tao, L. C., Asahi, K., Ueno, H.:
   “Nuclear magnetic moment of the neutron-rich nucleus ²¹O”
   Phys. Rev. C 107, 024306-1‒7 (2023)
   
2. Iimura, S., Rosenbusch, M., Takamine, A., Tsunoda, Y., Wada, M., Chen, S., Hou, D. S., Xian, W., Ishiyama, H., Yan, S., Schury, P., Crawford, H., Doornenbal, P., Hirayama, Y., Ito, Y., Kimura, S., Koiwai, T., Kojima, T. M., Koura, H., Lee, J., Liu, J., Michimasa, S., Miyatake, H., Moon, J. Y., Nishimura, S., Naimi, S., Niwase, T., Odahara, A., Otsuka, T., Paschalis, S., Petri, M., Shimizu, N., Sonoda, T., Suzuki, D., Watanabe, Y. X., Wimmer, K., and Wollnik, H.:
   “A new study of the N = 32 and N = 34 shell gap for Ti and V by the first high-precision MRTOF mass measurements at BigRIPS-SLOWRI”
   Phys. Rev. Lett. 130, 012501-1‒6 (2023).
   
3. 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., Mukai, M., Moon, J. Y., Nishimura, S., Naimi, S., Niwase, T., Sonoda, T., Watanabe, Y. X., and Wollnik, H.:
   “The new MRTOF mass spectrograph following the ZeroDegree spectrometer at RIKEN's RIBF facility”
   Nucl. Instrum. Methods Phys. Res. A 1047,167824-1‒12 (2023).
   
4. Otsuka, T., Abe, T., Yoshida, T., Tsunoda, Y., Shimizu, N., Itagaki, N., Utsuno, Y., Vary, J., Maris, P., Ueno, H.:
   “α-Clustering in atomic nuclei from first principles with statistical learning and the Hoyle state character”
   Nat. Commum. 13, 2234-1‒10 (2022).
   
5. Ramadhan, M. R., Adiperdana, B., Ramli, I., Sari, D. P., Putri, A. E., Wydiaiswari, U., Rozak, H., Zaharim, W. N., Manaf, A., Kurniawan, B., Mohamed-Ibrahim, M. I., Sulaiman, S., Kawamata, T., Adachi, T., Koike, Y., Watanabe, I.:
   “Estimation of the on-site Coulomb potential and covalent state in La₂CuO₄ by muon spin rotation and density functional theory calculations”
   Phys. Rev. Research 4, 033044-1‒10 (2022).
   
6. Sari, D. P., Asih, R., Hiraki, K., Nakano, T., Nozue, Y., Ishii, Y., Hillier, A. D., Watanabe, I.:
   “Distorted superconducting nodal line on a single Fermi surface in the anisotropic organic superconductor λ-(BETS)₂GaCl₄”
   Phys. Rev. B 104, 224506-1‒9 (2021).
   
7. Boulay, F., Simpson, G. S., Ichikawa, Y., Kisyov, S., Bucurescu, D., Takamine, A., Ahn, D. S., Asahi, K., Baba, H., Balabanski, D. L., Egami, T., Fujita, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Gladkov, A., Hass, M., Imamura, K., Inabe, N., Ishibashi, Y., Kawaguchi, T., Kawamura, T., Kim, W., Kobayashi, Y., Kojima, S., Kusoglu, A., Lozeva, R., Momiyama, S., Mukul, I., Niikura, M., Nishibata, H., Nishizaka, T., Odahara, A., Ohtomo, Y., Ralet, D., Sato, T., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Tao, L. C., Togano, Y., Tominaga, D., Ueno, H., Yamazaki, H., Yang, X. F., Daugas, J. M.:
   “g-Factor of the ⁹⁹Zr (7/2⁺) isomer: Monopole evolution in shape coexisting region”
   Phys. Rev. Lett. 124, 112501-1‒6 (2020).
   
8. Tsunoda, N., Otsuka, T., Takayanagi, K., Shimizu, N., Suzuki, T. Utsuno, Y. Yoshida, S., Ueno, H.
   “The impact of nuclear shape on the emergence of the neutron dripline”
   Nature 587, 66‒71 (2020).
   
9. Walker, P. M., Hirayama, Y., Lane, G. J., Watanabe, H., Dracoulis, G. D., Ahmed, M., Brunet, M., Hashimoto, T., Ishizawa, S., Kondev, F. G., Litvinov, Y., Miyatake, H., Moon, J. Y., Mukai, M., Niwase, T., Park, J. H., Podolyák, Z., Rosenbusch, M., Schury, P., Wada, M., Watanabe, X. Y., Liang, W. Y., Xu, F. R.:
   “Properties of ¹⁸⁷Ta revealed through isomeric decay”
   Phys. Rev. Lett. 125, 192505-1–5 (2020).
   
10. Ichikawa, Y., Nishibata, H., Tsunoda, Y., Takamine, A., Imamura, K., Fujita, T., Sato, T., Momiyama, S., Shimizu, Y., Ahn, D. S., Asahi, K., Baba, H., Balabanski, D. L., Boulay, F., Daugas, J. M., Egami, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Gladkov, A., Inabe, N., Ishibashi, Y., Kobayashi, Y., Kojima, S., Kusoglu, A., Kawaguchi, T., Kawamura, T., Mukul, I., Niikura, M., Nishizaka, T., Odahara, A., Ohtomo, Y., Otsuka, T., Ralet, D., Simpson, G. S., Sumikama, T., Suzuki, H., Takeda, H., Tao, L. C., Togano, Y., Tomonaga, D., Ueno, H., Yamazaki, H., Yang, X. F.:
    “Measurement of the magnetic moment of ⁷⁵Cu reveals the interplay between nuclear shell evolution and shape deformation”
    Nat. Phys. 15, 321‒325 (2019).

Laboratory Team