Thick target photon yeilds and angular distributions for the {sup 19}F{sub (p,alpha gamma)}{sup 16}O source reaction at incident proton energies between 1.5 and 4.0 MEV.
The absolute thick target yield of 6.129, 6.917 and 7.116 MeV {gamma}-rays produced from the {sup 19}F{sub (p,{alpha}{gamma})}{sup 16}O source reaction has been measured for incident proton energies between 1.5 and 4.0 MeV. The angular distributions of the respective {gamma}-lines have been determined for incident proton energies of 2.0 and 3.0 MeV. The experiments were performed at the 4.5 MV Tandem Van der Graaff accelerator at the Ohio University Edwards Accelerator Laboratory in Athens, Ohio, using a thick CaF{sub 2} target and a 7.62 cm x 7.62 cm Na(I) scintillation detector. The Monte Carlo code MCNP was used to calculate detector response functions for the three individual {gamma}-rays. A least-squares fit of these functions to a selected region in the pulse height spectrum was carried out to determine the relative intensities of these {gamma}-rays. The uncertainty in the fluence determination is based on the {chi}{sup 2} of the fit, the uncertainty in the response functions, the statistics of the data, and the uncertainty in the recording of the proton charge. A maximum photon yield of 1.316 x 10{sup 7} {gamma}/{mu}C/sr (at 90{sup o}) was determined for the sum of these three {gamma}-rays at the highest incident proton energy of 4.0 MeV. The contribution of the individual lines to the total photon yield depends strongly on the incident proton energy. The angular distributions are isotropic to within 15%.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 942788
- Report Number(s):
- ANL/TD/JA-34622; NIMAER; TRN: US0904230
- Journal Information:
- Nucl. Instrum. Methods Phys. Res. A, Vol. 450, Issue 2-3 ; Aug. 11, 2000; ISSN 0168-9002
- Country of Publication:
- United States
- Language:
- ENGLISH
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