Yoshitaka Fujita
Associate Professor
Fundamental Nuclear Physics Group
Room 222, Laboratory of Nuclear Studies (Toyonaka Campus map )
1-1 Machikaneyama, Toyonaka, Osaka 560-0043
Research Interests:

Spin-Isospin and Electro-Magnetic Responses of Nuclei are studied by combining the measurements of nuclear reaction and nuclear decay.  
1) World-best High Energy-Resolution has been achieved in the study of nuclear reaction at intermediate incoming energies by using a magnetic spectrometer system.
2) Detailed nuclear excitations, such as Gamow-Teller or E1 excitations are studied by best using the achieved high resolution, thus detailed nuclear structures are studied.
3) Detailed studies from the reactions are combined and compared with those from β- and γ-decay studies using the idea of Isospin-Symmetry in nuclei.
4) The combined study allows to deduce the structures of proton-rich exotic nuclei, that plays important roles in the Nucleosynthesis, or at the time of Supernova Explosion.

One order of magnitude better energy resolution of the (3He, t) measurement compared to the pioneering (p, n) measurement brought a qualitative change in the energy spectra.

The Gamow-Teller transition strengths in the β-decay from a proton-rich exotic nucleus 50Fe [Fig. (c)] are deduced by multiplying the phase-space factor f [Fig.(b)] to the high resolution 50Cr(3He, t)50Mn spectrum [Fig. (a)].

Selected Publications:

Gamow-Teller transitions in exotic pf-shell nuclei relevant to supernova explosion, Y. Fujita, B. Rubio, T. Adachi, F. Molina, A. Algora, G.P.A. Berg, P. von Brentano, J. Buscher, T. Cocolios, D. De Frenne, C. Fransen, H. Fujita, K. Fujita, W. Gelletly, K. Hatanaka, M. Huyse, O. Ivanov, Yu. Kudryavtsev, E. Jacobs, D. Jordan, K. Nakanishi, A. Negret, D. Pauwels, A.B. Perez-Cerdan, N. Pietralla, Z. Podolyak, L. Popescu, R. Raabe, Y. Sakemi, M. Sawicka, Y. Shimbara, Y. Shimizu, T. Shizuma, Y. Tameshige, A. Tamii, P. Van den Bergh, J. Van de Walle, P. Van Duppen, M. Yosoi and K.O. Zell, Journal of Physics G 35, 014041 (2008).

Detailed study of Gamow-Teller transitions: the impact on astro- and nuclear-structure physics, Y. Fujita, Nuclear Physics A 805 408c (2008).

Gamow-Teller strengths in A=34 isobars: Comparison of the mirror transitions Tz=+1→0 and T_z=-1→0, Y. Fujita, R. Neveling, H. Fujita, T. Adachi, N.T. Botha, K. Hatanaka, T. Kaneda, H. Matsubara, K. Nakanishi, Y. Sakemi, Y. Shimizu, F.D. Smit, A. Tamii, and M. Yosoi, Physical Review C 75, 057305 (2007).

Gamow-Teller stengths in proton-rich exotic nuclei deduced in the combined analysis of mirror transitions, Y. Fujita, T. Adachi, P. von Brentano, G.P.A. Berg, C. Fransen, D. De Frenne, H. Fujita, K. Fujita, K. Hatanaka, E. Jacobs, K. Nakanishi, A. Negret, N. Pietralla, L. Popescu, B. Rubio, Y. Sakemi, Y. Shimbara, Y. Shimizu, Y. Tameshige, A. Tamii, M. Yosoi and K.O. Zell, Physical Review Letters 95, 212501 (2005).

Evidence for the existence of the [2 0 2]3/2 deformed band in mirror nuclei 25Mg and 25Al, Y. Fujita, I. Hamamoto, H. Fujita, Y. Shimbara, T. Adachi, G.P.A. Berg, K. Fujita, K. Hatanaka, J. Kamiya,
K. Nakanishi, Y. Sakemi, Y. Shimizu, M. Uchida, T. Wakasa and M. Yosoi, Physical Review Letters 92, 062502 (2004).


Yoshitaka Fujita received the Ph. D degree in Physics from Osaka University. He has been doing nuclear reaction experiments at RCNP, (Osaka), IUCF (Indiana), NSCL, MSU (Michigan), iThmba LABS (Cape Town) and nuclear decay experiments at ISOLDE (CERN), GSI (Darmstadt), CRC (Louvain la Neuve), GANIL (Caen), CNS-Tokyo/RIKEN (Saitama) and ELBE (Dresden).