Advanced Meson Science Laboratory
Chief Scientist
Masahiko IWASAKI (D.Sci.)
Particles like muons, pions, and kaons have finite life times, so they do not exist in natural nuclei or matters. Implanting these particles into nuclei/matters, exotic phenomena in varieties of objects can be studied from a new point of view. Kaon is a second lightest meson which has strange-quark as a constituent quark. It is expected that if one embed a kaon into nuclei, the sizes of the nuclei become smaller and forms a high density object beyond the normal nuclear density. Study of this object could lead better understanding of the origin of the mass of the matter, and may reveal the quark degree of freedom beyond the quark-confinement. Those properties can be studied by precise heavy pionic atom research in different angle. The other example is the weak interaction in nuclear matter. It can only be studied by the weak decay of hypernuclei, which have Lambda particle in the nuclei, Muon provides even wider variety of study from nuclear reaction to magnetism in matter. For instance, stopping positively charged muon in a material, we obtain information on the magnetic properties or the local field at the trapped site(muon-spin-relaxation method). Injecting negatively charged muon to mixture of deuterium and tritium, muon attracts surrounding atoms and is known to cause d-t fusions. In addition, the in-beam Mössabuer spectroscopy coupled with heavy-ion beams plays a complementary role to muon-spin-relaxation method. Mössbauer spectroscopy is one of the powerful tools to understand the chemical states and dynamic behaviors of localized atoms in condensed matters via hyperfine interaction. Theoretical research covers from the study of Quantum Hall system to the study string theory via matrix models. As is already clear, in our research we introduce different kind of impurities into nuclei/matters, and study new states of matter, new phenomena, or the object properties.
- Study of meson property and interaction in nuclei
- Origin of matter mass / quark degree of freedom in nuclei
- Materials science by muon-spin-relaxation method and Mössbauer spectroscopy
- Nuclear and particle physics studies via muon catalyzed fusion and ultra cold muon beam
- RIKEN Nishina Center for Accelerator-Based Science Website_Laboratories Page
- Individual Website Laboratory Page
- January 23,2009
- Escape from frustration
When the bonds between atoms suddenly alter in strength, structural changes in symmetry result
- December 12,2008
- Superconductivity breaks with convention
Magnetic fluctuations may play an important role in the mechanism for superconductivity in the iron-pnictides
- February 01,2008
- Sticky spins
Researchers show how spins freeze in a molecular magnet
- M. Iwasaki, H. Bhang, J. Chiba, Choi Seonho, Y. Fukuda, T. Hanaki, R.S. Hayano, M. Iio, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwai, P. Kienle, J.H. Kim, Y. Matsuda, H. Ohnishi, S. Okada, H. Outa, M. Sato, S. Suzuki, T. Suzuki, D. Tomono,:
"Search for strange tribaryon states in the inclusive He-4 (K-(stopped), p) reaction"
Nucl. Phys. A804, 186-196 (2008) - S. Okada, G. Beer, H. Bhang, M. Cargnelli, J. Chiba, Seonho Choi, C. Curceanu, Y. Fukuda, T. Hanaki, R.S. Hayano, M. Iio, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwai, M. Iwasaki, B. Juhasz, P. Kienle, J. Marton, Y. Matsuda, H. Ohnishi, H.:
"Precision measurement of the 3d ---> 2p x-ray energy in kaonic He-4"
Physics Letters B 653, 387-391 (2007). - T. Suzuki, H. Bhang, J. Chiba, S. Choi, Y. Fukuda, T. Hanaki, R. S. Hayano, M. Iio, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwai, M. Iwasaki, P. Kienle, J. H. Kim, Y. Matsuda, H. Ohnishi, S. Okada, H. Outa, M. Sato, S. Suzuki, D. Tomono,:
"Lambda d correlation from He-4(stopped K-, d) reaction"
Physicl Review C76, 068202 (2007) - Y. Tanabe, T. Adachi, K. Suzuki, Y. Koike, T. Kawamata1, Risdiana, T. Suzuki1, and I. Watanabe,:
"Similarity between Ni- and Zn-Impurity Effects on the Superconductivity and Cu-spin Correlation in La-214 High-TC Cuprates: Review Based on the Hole Trapping by Ni"
Phys. Rev. B 83, 144521-1-6 (2011) - F.L. Pratt, P.J. Baker, S.J. Blundell, T. Lancaster, S. Ohira-Kawamura, C. Baines, Y. Shimizu, K. Kanoda, and I. Watanabe,:
"Magnatic-Field-Induced Quantum-Phase-Transition in the Spin-Liquid Phase of a Frustrated Magnet"
Nature 471, 612-616 (2011) - T. Lancaster, F.L. Pratt, S.J. Blundell, A.J. Steele, P.J. Baker, J.D. Wright, I. Watanabe, R.S. Fishman, and J.S. Miller,:
"Local Magnetism in the Molecule-Based Metamagnet [Ru2(O2CMe)4]3[Cr(CN)6] Probed with Implanted Muons"
Phys. Rev. B 84, 092405-1-4 (2011) - Imao, H., Ishida, K., Kawamura, N., Matsuzaki, T., Matsuda, Y., Toyoda, A., Strasser, P., Iwasaki, M. and Nagamine, K.:
"Density effect in d-d muon-catalyzed fusion with ortho- and para-enriched D2"
Phys. Lett. B 658, 120-124 (2008) - Nagatomo, T., Kobayashi, Y., Kubo, M. K., Yamada, Y., Mihara, M., Sato, W., Miyazaki, J., Sato, S., and Kitagawa, A.:
"Remarkable improvement of signal-to-noise ratio of 57Mn in-beam Mössbauer spectroscopy"
Nuclear Instruments and Methods in Physics Research Section B 269 (2011) 455-459. - Bakule, P., Matsuda, Y., Miyake, Y., Nagamine, K., Iwasaki, M., Ikedo, Y., Shimomura, K., Strasser, P., and Makimura, S.:
"Pulsed source of ultra low energy positive muons for near-surface mSR studies"
Nuclear Instruments and Methods in Physical Research B 266, 335-346 (2008) - M. Hanada, M. Hayakawa, N. Ishibashi, H. Kawai, T. Kuroki, Y. Matsuo, T. Tada,:
"Loops versus Matrices - The nonperturbative aspects of noncritical string"
Prog.Theor.Phys. 112 (2004) 131-181
Principal Investigator
- Masahiko IWASAKI
- Chief Scientist
Staff Scientist
- Tsukasa TADA
- Vice Chief Scientist
- Katsuhiko ISHIDA
- Vice Chief Scientist
- Teiichiro MATSUZAKI
- Vice Chief Scientist
- Haruhiko OUTA
- Senior Research Scientist
- Hiroaki ONISHI
- Senior Research Scientist
- Yoshio KOBAYASHI
- Senior Research Scientist
- Isao WATANABE
- Senior Research Scientist
- Kenta ITAHASHI
- Senior Research Scientist
- Fuminori SAKUMA
- Research Scientist
Postdoctoral Fellow
- Kazuki UENO
- Special Postdoctoral Researcher
- Koji YOKOYAMA
- Contract Researcher
- Dai TOMONO
- Contract Researcher
- Ikuto KAWASAKI
- Postdoctoral Researcher
Student Trainee
- Yuya FUJIWARA
- Junior Research Associate
- Budi ADIPERDANA
- International Program Associate
- Makoto TOKUDA
- Junior Research Associate
- Yuta SADA
- Junior Research Associate
- Tadashi HASHIMOTO
- Junior Research Associate