Abstract
We measured the Be-7(p,gamma)B-8 cross section from E-p = 221 keV to 1376 keV. A uniformly distributed beam that illuminated the whole area of a small diameter target was used to eliminate systematic error from Be-7 target non-uniformity. The energy loss profile of the target to the incident beam was measured using the Be-7(alpha,gamma)C-11 resonance at E-alpha = 1376 keV. The (alpha,gamma) measurement also demonstrated that the target had a high Be-7 atomic purity. The measured yield of the detected B-8 was normalized to the activity of the target and the solid angle of the counting detector. Corrections for B-8 decay during bombardment and arm rotation were applied. For the first time, the correction due to lost 'B from backscattering was determined experimentally. A new experiment is presently underway, extending to lower proton energy. Due to a problem in the determination of the alpha-detector solid angle in the first measurement, the solid angle in the new measurement will be determined by a different technique using a Gd-148 alpha source and a silicon detector whose distance to the source can be precisely adjusted.
| Original language | English |
|---|---|
| Pages (from-to) | 113C-116C |
| Number of pages | 4 |
| Journal | Nuclear Physics A |
| Volume | 718 |
| DOIs | |
| Publication status | Published - 5 May 2003 |