High resolution study of isovector negative parity states in the O16(He3,t)F16 reaction at 140 MeV/nucleon

H. Fujita, G. P.A. Berg, Y. Fujita, J. Rapaport, T. Adachi, N. T. Botha, H. Fujimura, K. Fujita, K. Hara, K. Hatanaka, J. Kamiya, T. Kawabata, K. Nakanishi, R. Neveling, N. Sakamoto, Y. Sakemi, Y. Shimbara, Y. Shimizu, F. D. Smit, M. UchidaT. Wakasa, M. Yoshifuku, M. Yosoi, R. G.T. Zegers

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Abstract

The isovector transitions from the ground state (g.s.) of O16 to the negative parity states in F16, i.e., the Jπ=0- g.s., the 0.193 MeV, 1- state, the 0.424 MeV, 2- state, the 0.721 MeV, 3- state, and the 4- "stretched" state at 6.372 MeV, were studied by using a high resolution O16(He3,t)F16 reaction at 140 MeV/nucleon. With the help of high energy resolution, these states were, for the first time, clearly resolved in a charge exchange reaction at an intermediate energy, which favorably excites spin-flip states. Angular distributions of the reaction cross sections were measured in the laboratory frame from 0° to 14°. Parameters of phenomenological effective interactions were derived so as to reproduce these angular distributions in distorted wave Born approximation (DWBA) calculations. The angular distribution of the 0- state could be reproduced well at θc.m.<10°. The empirical values, however, are larger by a factor of 2-2.5 in the larger angle region, where the contribution of the so-called "condensed pion field" is expected. The high resolution also enabled the decay widths of these states to be measured.

Original languageEnglish
Article number024314
JournalPhysical Review C - Nuclear Physics
Volume79
Issue number2
DOIs
Publication statusPublished - Feb 2 2009

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Fujita, H., Berg, G. P. A., Fujita, Y., Rapaport, J., Adachi, T., Botha, N. T., Fujimura, H., Fujita, K., Hara, K., Hatanaka, K., Kamiya, J., Kawabata, T., Nakanishi, K., Neveling, R., Sakamoto, N., Sakemi, Y., Shimbara, Y., Shimizu, Y., Smit, F. D., ... Zegers, R. G. T. (2009). High resolution study of isovector negative parity states in the O16(He3,t)F16 reaction at 140 MeV/nucleon. Physical Review C - Nuclear Physics, 79(2), [024314]. https://doi.org/10.1103/PhysRevC.79.024314