Experimental and theoretical study of continuous proton spectra from high-energy deuteron induced reactions

doi:10.1016/0375-9474(80)90651-X

Nuclear Physics A

Volume 343, July 1980, Pages 221-233

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Abstract

Inclusive proton spectra were measured from 80 MeV deuteron-induced reactions on ²⁷Al, ⁹³Nb and ¹⁹⁷Au targets. At forward angles the spectra exhibit broad deuteron break-up peaks centered around one-half of the incident deuteron energy for all the nuclei studied. Double-differential as well as angle-integrated cross sections in the bump region are well reproduced by calculations in the framework of the DWBA approach to break-up taking elastic and inelastic reactions of the neutron with the target nucleus into account. Like the observation made in case of low-energy deuteron break-up as well as in high-energy alpha break-up, the inelastic break-up is found to be a dominant reaction mode at this higher deuteron energy also. The preequilibrium contributions to the outgoing proton spectra have also been calculated. The analysis of the experimental data has been discussed in the light of these two different reaction mechanisms. It is found that these two reaction mechanisms put together provide a good overall description of the experimental proton spectra.

References (23)

G. Baur et al.
G. Baur et al.
Nucl. Phys.
(1979)
J.R. Wu et al.
Phys. Rev.
(1979)
P.J.A. Buttle et al.
G. Duhamel et al.
Nucl. Phys.
(1971)
G. Baur et al.
Nucl. Phys.
(1976)
M. Blann
Ann. Rev. Nucl. Sci.
(1975)
E. Bětàk et al.
Z. Phys.
(1976)
R. Shyam et al.
Phys. Rev.
(1979)
A. Budzanowski et al.
Phys. Rev. Lett.
(1978)
A. Budzanowski et al.
Z. Phys.
(1979)

J. Pampus et al.

Nucl. Phys.

(1978)

G. Baur et al.

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^†: Alexander von Humboldt Fellow.

^††: Present address: Fys. Lab., University Utrecht, NL-3508 TA Utrecht, The Netherlands.

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Experimental and theoretical study of continuous proton spectra from high-energy deuteron induced reactions

Abstract

Nucl. Phys.

Phys. Rev.

Nucl. Phys.

Nucl. Phys.

Ann. Rev. Nucl. Sci.

Z. Phys.

Phys. Rev.

Phys. Rev. Lett.

Z. Phys.

Nucl. Phys.