Heavy Ion Nuclear Physics Laboratory
Chief Scientist
Tohru MOTOBAYASHI (D.Sci.)
With fast RI beams provided by the RIBF cyclotron complex, we study exotic behavior of nuclei far from the stability valley, explosive nuclear burning in high-temperature and high-density environment in stars and early universe, and nuclear reactions related to solar neutrino production. For that purpose, we develop various experimental methods based on intermediate-energy inelastic scattering including Coulomb excitation, Coulomb dissociation, transfer- and fragmentation-reactions coupled with gamma-ray and particle-decay measurements. We perform also study of the three-nucleon forces by precise measurements of elastic scattering and breakup reactions of few-nucleon systems and development of new technics including new laser-spectroscopy for exotic nuclei. Developments of radiation detectors such as semiconductor detectors and scintillation detectors, data processing methods, and construction of experimental equipment are also made.
- Spectroscopy of unstable nuclei with direct reactions
- Development of radiation detector systems with high precision and high efficiency
- Study of astrophysical nuclear reactions with fast beams of unstable nuclei
- Development of laser spectroscopy for unstable nuclei
- Elementary processes for nuclear transmutation studied by fast RI beams
- Takeuchi, S., Aoi, N., Motobayashi, T., Ota, S., Takeshita, E., Suzuki, H., Baba, H., Fukui, T., Hashimoto, Y., Ieki, K., Imai, N., Iwasaki, H., Kanno, S., Kondo, Y., Kubo, T., Kurita, K., Minemura, T., Nakabayash, T., Nakamura, I T., Okumura, T., Onishi, T.K., Sakurai, H., Shimoura, S,, Sugou, R., Suzuki, D.:
Suzuki, M.K., Takashina, M., Tamaki, M., Tanaka, K., Togano, Y., and Yamada, K.:
"Low-lying states in 32Mg studied by proton inelastic scattering."
Phys. Rev. C79, 054319. (2009) - Aoi, N., Takeshita, E., Suzuki, H., Takeuchi, S., Ota, S., Baba, H., Bishop, S., Fukui, T., Hashimoto, Y., Ong, H.J., Ideguchi, E., Ieki, K., Imai, N., Ishihara, M., Iwasaki, H., Kanno, S., Kondo, Y., Kubo, T., Kurita, K., Kusaka, K., Minemura, T., Motobayashi, T., Nakabayashi, T., Nakamura, T., Nakao, T., Niikura, M., Okumura, T., Ohnishi, T.K., Sakurai, H., Shimoura, S., Sugo, R., Suzuki, D., Suzuki, M.K., Tamaki, M., Tanaka, K., Togano, Y., and Yamada, K.:
"Development of large deformation in 62Cr."
Phys. Rev. Lett. 102 (2009) 012502. - Gibelin, J., Beaumel, D., Motobayashi, T., Blumenfeld, Y., Aoi, N., Baba, H., Elekes, Z., Fortier, S., Frascaria, N., Fukuda, N., Gomi, T., Ishikawa, K., Kondo, Y., Kubo, T., Lima, V., Nakamura, T., Saito, A., Satou, Y., Scarpaci, J.A., Takeshita, E., Takeuchi, S., Teranishi, T., Togano, Y., Vinodkumar, A. M., Yanagisawa, Y., and Yoshida, K.:
"Decay pattern of pygmy states observed in neutron-rich 26Ne."
Phys. Rev. Lett. 101 (2008) 212503 - Furukawa, T., Matsuo, Y., Hatakeyama, A., Fukuyama, Y., Kobayashi, T., Izumi, H., and Shimoda, T.:
"Measurement of a Long Electronic Spin Relaxation Time of Cesium Atoms in Superfulid Helium."
Phys. Rev. Lett. 96, 095301 (2006) - Michimasa, S., Shimoura, S., Iwasaki, H., Tamaki, M., Ota, S., Aoi, N., Baba, H., Iwasa, N., Kanno, S., Kubono, S., Kurita, K., Kurokawa, M., Minemura, T., Motobayashi, T., Notani, M., Ong, H.J., Saito, A., Sakurai, H., Takeshita, E., Takeuchi, S., Yanagisawa, Y., and Yoshida, A.:
"Proton single-particle states in the neutron-rich 23F nucleus."
Phys. Lett. B638. 146(2006) - Ryuto, H., Kunibu, M., Minemura, T., Motobayashi, T., Sagara, K., Shimoura, S., Tamaki, M., Yanagisawa, Y., and Yano, Y.:
"Liquid hydrogen and helium targets for radioisotope beams at RIKEN."
Nucl. Instrm. Meth. A555 , 1-5(2005) - Elekes, Z., Dombradi, Zs., Krasznahorkay, A., Baba, H., Castlos, M., Dsige, L., Fukuda, N., Fulop, Zs., Gasci, Z., Gulyas, J., Iwasa, N., Kinugawa, H., Kubono, S., Kurokawa, X., Liu, S., Michimasa, T., Minemura, T., Motobayashi, A., Ozawa, A.,and Saito, S.:
"Decoupling of valence neutrons from the core in 16C."
Phys. Lett. B586, 34 (2004). - Yamada, K., Motobayashi, T. , Akiyoshi, H., Aoi, N., Fulop, Zs., Gomi, T., Higurashi, Y., Imai, N., Iwasa, N., Iwasaki, H., Iwata, Y., Kobayashi, H., Kurokawa, M., Liu, Z., Minemura, T., Ozawa, S., Sakurai, H., Serata, M., Shimoura, S., Takeuchi, S.,and Tera.:
"E1 strength of the subthreshold 3/2+ state in 15O studied by Coulomb excitation."
Phys. Lett. B579, 265-270 (2004). - Yanagisawa, Y., Notani, M., Sakurai, H., Kunibu, M., Akiyoshi, H., Aoi, N., Baba, H., Demichi, H., Fukuda, N., Hasegawa, K., Higurashi, Y., Ishihara, M., Iwasa, N., Iwasaki, H., Gomi, T., Kanno, S., Kurokawa, M., Matsuyama, Y.U., Michimasa, S.,and Miemura, T.:
"The first excited state in 30Ne studies by proton inelastic scattering in reversed kinematics."
Phys. Lett. B566, 84-89 (2003). - Motobayashi, T.:
"Indirect measurements of the solar-neutrino production reaction 7Be(p,γ)8B."
Nucl. Phys. A693, 258-268 (2001).