- Access by Xinjiang University
Measurement of the proton-carbon bremsstrahlung cross sections at 2.135 MeV: Testing soft-photon approximations
Phys. Rev. C 45, 331 – Published 1 January, 1992
DOI: https://doi.org/10.1103/PhysRevC.45.331
Abstract
The proton-carbon bremsstrahlung (p ) cross sections as a function of photon energy have been measured at the incident proton energy of 2.135 MeV for two proton scattering angles: one at 155° and another one at 175°. We have extended the range of photon energy up to about 1.7 MeV, which is near the maximum photon energy, in order to study all possible resonant structures. Two resonant structures have been observed in the bremsstrahlung spectrum. The first is identified as the structure due to the 1.7-MeV elastic scattering resonance and the second is attributed to the 0.5-MeV resonance. These measured Cγ spectra with the detailed information about the resonant structure have been used to test the range of validity of various soft-photon approximations. We have found that our data can be described by a special two-energy–two-angle approximation, which depends on one elastic T matrix evaluated at the initial energy (or total energy squared) and another elastic T matrix evaluated at the final energy, but the approximation is free of any derivative of the elastic T matrix with respect to energy or scattering angle (or momentum transfer squared). Our study also shows that the resonant structure predicted by the one-energy–one-angle approximation disagrees with the experimental data.
References (14)
- M. K. Liou and Z. M. Ding, Phys. Rev. C 35, 651 (1987).
- C. Maroni, I. Massa and G. Vannini, Nucl. Phys. A273, 429 (1976); A. Cristallini, C. Maroni, I. Massa and G. Vannini, Phys. Lett. 56B, 245 (1975).
- C. C. Trail, P. M. S. Lesser, A. H. Bond, M. K. Liou and C. K. Liu, Phys. Rev. C 21, 2131 (1980).
- H. Taketani, M. Adachi, N. Endo and T. Suzuki, Phys. Lett. 113B, 11 (1982); H. Taketani, N. Endo, G. Ishikawa, T. Suzuki, M. Adachi, T. Kohno, A. Makishima and T. Ikuta, Nucl. Instrum. Methods 196, 283 (1982).
- P. M. S. Lesser, C. C. Trial, C. C. Perng and M. K. Liou, Phys. Rev. Lett. 48, 308 (1982).
- M. K. Liou, C. K. Liu, P.M.S. Lesser and C. C. Trail, Phys. Rev. C 21, 518 (1980).
- C. C. Perng, G. J. Jan, and M. K. Liou, Phys. Rev. C 23, 2357 (1981); G. J. Jan, C. C. Perng and M. K. Liou, Phys. Lett. 85B, 25 (1979).
- C. K. Liu, M. K. Liou C. C Trail, and P. M. S. Lesser, Phys. Rev. C 26, 723 (1982).
- Z. M. Ding and M. K. Liou, Mod. Phys. Lett. A 3, 1065 (1988); Z. M. Ding, Dahang Lin and M. K. Liou, Phys. Rev. C 40, 1291 (1989).
- F. E. Low, Phys. Rev. 110, 974 (1958).
- H. Feshbach, and D. R. Yennie, Nucl. Phys. 37, 150 (1962).
- C. C. Perng, D. Yan, P. M. S. Lesser, C. C. Trail and M. K. Liou, Phys. Rev. C 38, 514 (1988).
- J. B. Marion and F. C. Young, Nuclear Reaction Analysis: Graphs and Tables (North-Holland, Amsterdam, 1968).
- J. C. Armstrong, M. J. Baggett, W. R. Harris and V. A. Latonne, Phys. Rev. 144, 823 (1966).