Proton distribution radii (PDR) in light neutron rich nuclei, in particular for B, C, N, and O isotopes) will be determined though the measurements of charge changing cross sections using the radioactive isotope beams (RIB) of such nuclei available at the Ring cyclotron facility in Research Center for Nuclear Physics. The PDR for of light neutron-rich nuclei (He, Li, Be) were determined recently by isotope-shift measurements and provided unprecedented information on nuclear structure.  However this method is extremely difficult to apply for isotopes proposed here.  Presently proposed research will provide unique information on the PDR of nuclei of the elements heavier than Be.  That is why the presently proposed experiment has essential importance. Measured results in light nuclei would be compared with the predictions of new types of nuclear models based on so-called ab-initio calculations.  The validity of such model will be tested by this research project.

-The experiment for 10 days of beam time for measuring the charge changing cross-sections of the light neutron-rich nuclei using EN beam line of the ring cyclotron of The Research Center for Nuclear Physics (Oska University) was performed.

-The subject of investigation of charge changing cross-sections of the light neutron-rich nuclei will be continued in the future in collaboration with the Research Center for Nuclear Physics (Oska University).
- A new joint project with the center of suitanable energy and environment of Osaka Unversity has been created.
- Two Vietnamese researchers were granted postgraduate scholarships by Osaka University:
Tran Đinh Trong: Ph.D scholarship
Nguyen Thi Ha: Master scholarship
-02 master students were successfully received their master of science diploms:
Tran Van Huynh (2011)
Dang Hong Giang (2014)

-Kiểm tra các mẫu cấu trúc hạt nhân mới được đề xuất trong thời gian gần đây.
- We designed the MUSIC detector for energy-loss measurement and postion determination of the charged particles produced in nuclear reaction and used it in our experiment.
-The obtained data will be used for cheking some new nuclear reaction models proposed recently.

- Numer of papers published in peer review journals: 04
1. Le Hong Khiem, Tran Dinh Trong, Nguyen Tran Tho: An empirical formula for calculation of range of charged particles with Z from 2 to 103 and energy from 2.5 MeV/nucleon to 500 MeV/nucleon in beryllium, Nuclear Instruments and Methods in Physics Research B, Vol.B269 (2011) 2145-2149 (SCI)
2. D.T.Tran, T.T.Nguyen, K.Kimura, H.J.Ong, I.Tanihata, N.Aoi, N.D.Nguyen, H.K.Le, H.Sakaguchi, J.Tanaka: Perfomance of Multi-Sampling Ion Chamber (MUSIC) for particles identification of lightneutron-rich isotopes. RCNP Annual Report 2012.Osaka Univeristy.
3. N.T.Tho, T.Naito, M.Taniguchi, H.J.Ong, M.Fukuda, D.Nishimura, J.Tanaka, K.Hirota, K.Iwamoto, T.Kawabata, K.Matsuta, M.Mihara, S.Momota, D.Nagae, A.Ozawa, H.Sakaguchi, T.Suzuki, M.Takechi, A.Tamii, H.Uenishi, M.Yaguchi, T.Yamaguchi, K.Yokoyama, I.Tanihata: Determination of proton distribution Radii of p-sd shell nuclei by charge-changing cross sections measurements. RCNP Annual Report 2013.Osaka Univesity.
4. Le Hong Khiem, Tran Dinh Trong and Nguyen The Nghia: Stopping powers of alpha particles in some gases at energies from 1.0 to 6.0 MeV. Communications in Physics.Vol.24(2012) 19