NITROGEN-ALUMINIUM ELASTIC SCATTERING
Journal Article
·
· Nuclear Phys.
BS>The differential cross section for elastic scattering of 27.3-Mev nitrogen ions from aluminum was measured from 36 deg to 134 deg in the centre- of-mass system. A coincidence system detecting both the nitrogen and the aluminium ions was used to identify the elastic events. The angular resolution was about plus or minus 1 degree. The ratio of the elastic cross section to the Coulomb cross section exhibits a small rise above unity near 50 deg (c.m.), then drops almost exponentially from 60 deg to 134 deg (c.m.), where it has a value of 0.0265. The results of the experiment are compared with the predictions of a sharp cutoff calculation. Reasonably good agreement is obtained from 36 deg to 96 deg (c.m.) with an interaction radius R = 9.07 x 10/sup -13/ cm. If R = gamma /sub 0/(A/sub 1//sup 1/3/ + A/sub 2//sup 1/3/), the va lue of gamma /sub 0/ is 1.68 x 10/sup -13/ cm. Beyond 96 deg (c.m.) the sharp cutoff calculation displays increasing oscillations and no longer fits the data. The results of a semi-classical scattering theory due to Ford and Wheeler are compared with the experimental data. The best fit is obtained for a rainbow angle theta /sub r/ = 94 deg , corresponding to gamma /sub 0/ = 1.59 x 10/sup -13/ cm, and a s urface thickness parameter DELTA R = 0.83 x 10/sup -13/ cm. Quite good agreement between this theory and experiment is obtained from about 94 deg to 134 deg (c.m.). (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-016282
- OSTI ID:
- 4154103
- Journal Information:
- Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 16
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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