## Abstract

The {sup 40}Ca({gamma},n) reaction cross section has been measured with tagged photons with energies ranging from 31.2 to 102 MeV, for neutron emission angles of 45, 60, 75, 90 and 135 degrees. Exclusive differential cross sections for the {sup 40}Ca({gamma},n) and {sup 40}Ca({gamma},p) reactions are found to be of a similar magnitude, but are not well predicted by recent RPA and relativistic direct knock-out calculations. A quasi-deuteron model calculation with spin-orbit splitting of single-particle shells and an improved nucleon transparency correction is found to be consistent with the data. However, it is shown that this does not establish that the photo-absorption matrix element for the deuteron is necessarily similar to that of a correlated np-pair in nuclear matter. This result is generalized to question the predicted sensitivity to short-range correlations for photonuclear reactions calculated within the Gottfried factorization. 41 refs., 2 tabs., 5 figs.

Eden, J A;
O`Keefe, G J;
Rassool, R P;

^{[1] }Suda, T; Nomura, I; Yokokawa, J^{[2] }- Melbourne Univ., Parkville (Australia). School of Physics
- Tohoku Univ., Sendai (Japan). Lab. of Nuclear Science; and others

## Citation Formats

Eden, J A, O`Keefe, G J, Rassool, R P, Suda, T, Nomura, I, and Yokokawa, J.
{sup 40}Ca photoneutron cross section above the GDR.
Australia: N. p.,
1991.
Web.

Eden, J A, O`Keefe, G J, Rassool, R P, Suda, T, Nomura, I, & Yokokawa, J.
{sup 40}Ca photoneutron cross section above the GDR.
Australia.

Eden, J A, O`Keefe, G J, Rassool, R P, Suda, T, Nomura, I, and Yokokawa, J.
1991.
"{sup 40}Ca photoneutron cross section above the GDR."
Australia.

@misc{etde_10115335,

title = {{sup 40}Ca photoneutron cross section above the GDR}

author = {Eden, J A, O`Keefe, G J, Rassool, R P, Suda, T, Nomura, I, and Yokokawa, J}

abstractNote = {The {sup 40}Ca({gamma},n) reaction cross section has been measured with tagged photons with energies ranging from 31.2 to 102 MeV, for neutron emission angles of 45, 60, 75, 90 and 135 degrees. Exclusive differential cross sections for the {sup 40}Ca({gamma},n) and {sup 40}Ca({gamma},p) reactions are found to be of a similar magnitude, but are not well predicted by recent RPA and relativistic direct knock-out calculations. A quasi-deuteron model calculation with spin-orbit splitting of single-particle shells and an improved nucleon transparency correction is found to be consistent with the data. However, it is shown that this does not establish that the photo-absorption matrix element for the deuteron is necessarily similar to that of a correlated np-pair in nuclear matter. This result is generalized to question the predicted sensitivity to short-range correlations for photonuclear reactions calculated within the Gottfried factorization. 41 refs., 2 tabs., 5 figs.}

place = {Australia}

year = {1991}

month = {Dec}

}

title = {{sup 40}Ca photoneutron cross section above the GDR}

author = {Eden, J A, O`Keefe, G J, Rassool, R P, Suda, T, Nomura, I, and Yokokawa, J}

abstractNote = {The {sup 40}Ca({gamma},n) reaction cross section has been measured with tagged photons with energies ranging from 31.2 to 102 MeV, for neutron emission angles of 45, 60, 75, 90 and 135 degrees. Exclusive differential cross sections for the {sup 40}Ca({gamma},n) and {sup 40}Ca({gamma},p) reactions are found to be of a similar magnitude, but are not well predicted by recent RPA and relativistic direct knock-out calculations. A quasi-deuteron model calculation with spin-orbit splitting of single-particle shells and an improved nucleon transparency correction is found to be consistent with the data. However, it is shown that this does not establish that the photo-absorption matrix element for the deuteron is necessarily similar to that of a correlated np-pair in nuclear matter. This result is generalized to question the predicted sensitivity to short-range correlations for photonuclear reactions calculated within the Gottfried factorization. 41 refs., 2 tabs., 5 figs.}

place = {Australia}

year = {1991}

month = {Dec}

}