γ rays from peripheral and central collisions in the reaction <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Ar</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>40</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mo>+</mo></mrow><mrow><mn>158</mn></mrow></msup></mrow></math>Gd at 44 MeV/nucleon

R. Hingmann; W. Kühn; V. Metag; R. Mühlhans; R. Novotny; A. Ruckelshausen; W. Cassing; H. Emling; R. Kulessa; H. J. Wollersheim; B. Hass; J. P. Vivien; A. Boullay; H. Delagrange; H. Doubre; C. Grégoire; Y. Schutz

doi:10.1103/PhysRevLett.58.759

γ rays from peripheral and central collisions in the reaction ${}^{40}{Ar}$ $+^{158}$ Gd at 44 MeV/nucleon

R. Hingmann, W. Kühn, V. Metag, R. Mühlhans, R. Novotny, A. Ruckelshausen, W. Cassing, H. Emling, R. Kulessa, H. J. Wollersheim, B. Hass, J. P. Vivien, A. Boullay, H. Delagrange, H. Doubre, C. Grégoire, and Y. Schutz

Phys. Rev. Lett. 58, 759 – Published 23 February 1987

Abstract

Inclusive and exclusive γ-ray spectra have been measured in the reaction ${}^{40}{Gd}$ at 44 MeV/nucleon. Impact-parameter selection has been provided by various coincidence conditions with a forward-angle particle detector. The γ yield for $E_{γ}$ >25 MeV is consistent with emission from the nucleon-nucleon system and decreases strongly for larger impact parameters. Below 25 MeV, the photons originate from statistical decay of the excited fragments with a strength function dominated by giant resonances. The observed γ yields provide information on the excitation energies of the reaction products.