Difference between revisions of "Bubble Chamber Beam Test September 2015"
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* '''Run Plan:''' | * '''Run Plan:''' | ||
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| + | * Suppression of <sup>14</sup>N(γ,p)<sup>13</sup>C events: | ||
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# Determine an initial pressure and temperature with no beam | # Determine an initial pressure and temperature with no beam | ||
# Start with beam at K.E. 6.5 MeV | # Start with beam at K.E. 6.5 MeV | ||
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# At K.E. of 8.5 MeV, increase the chamber threshold by increasing the pressure. Suppress the <sup>14</sup>N(γ,p)<sup>13</sup>C events. | # At K.E. of 8.5 MeV, increase the chamber threshold by increasing the pressure. Suppress the <sup>14</sup>N(γ,p)<sup>13</sup>C events. | ||
# Once <sup>14</sup>N(γ,p)<sup>13</sup>C is suppressed, the rate should drop by three orders of magnitude | # Once <sup>14</sup>N(γ,p)<sup>13</sup>C is suppressed, the rate should drop by three orders of magnitude | ||
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| + | * Measuring rates from <sup>18</sup>O(γ,α)<sup>14</sup>C: | ||
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# | # | ||
Revision as of 17:58, 3 September 2015
Run Plan
- Chamber is filled with natural N2O
- Cross sections:
The cross sections are shown in the following figure:
- Expected rates:
The expected rates are calculated with 3 cm cell thickness and thin radiator.
- The expected rates are shown in the following figure:
- The expected rates from oxygen isotopes are shown in the following figure:
- Run Plan:
- Suppression of 14N(γ,p)13C events:
- Determine an initial pressure and temperature with no beam
- Start with beam at K.E. 6.5 MeV
- Increase beam K.E. by 0.1 MeV steps all the way to 8.5 MeV
- Reproduce the overall rate shown above
- At K.E. of 8.5 MeV, increase the chamber threshold by increasing the pressure. Suppress the 14N(γ,p)13C events.
- Once 14N(γ,p)13C is suppressed, the rate should drop by three orders of magnitude
- Measuring rates from 18O(γ,α)14C: