Measured Yields from Uranium Carbide Using the LaB6 Surface Ionization Ion Source

Measured Yields from Uranium Carbide Using the LaB<sub><font size="-2">6</font></sub> Surface Ionization Ion Source
This source is able to provide isobarically pure beams due to the chemical selectivity of the LaB6 surface. This uranium carbide target has been proven to withstand 10 uA of proton beam from ORIC.

Element Mass Half-life Cumulative production rate
ions/s/uA of protons
Yield from LaB6 source
ions/s/uA of protons
TIS efficiency1
Beam into tandem2
(with 5 uA of protons)
Br 83 2.40 h 9.04E+07 6.4E+06 7.1 3.2E+07
84g 31.8 m 1.12E+08 5.2E+06 4.6 2.6E+07
85 2.90 m 1.34E+08 3.2E+06 2.4 1.6E+07
86 55.1 s 1.32E+08 8.5E+05 0.6 4.3E+06
87 55.6 s 1.11E+08 1.5E+06 1.3 7.5E+06
88 16.3 s 6.82E+07 2.3E+05 0.3 1.2E+06
I 132m 1.39 h 1.35E+08 8.2E+0 0.61 4.1E+06
132g 2.3 h 1.35E+08 7.3E+05 0.54 3.7E+06
134m 3.6 m 3.60E+08 1.5E+06 0.42 7.5E+06
134g 52.5 m 4.13E+08 2.7E+06 0.65 1.4E+07
136m 46.9 s 2.20E+08 1.9E+06 0.87 9.5E+06
136g 1.39 m 2.26E+08 1.2E+06 0.53 6.0E+06
137 24.5 s 2.25E+08 2.2E+05 0.10 1.1E+06
138 6.5 s 7.65E+07 2.3E+04 0.03 1.2E+05
1Despite the small efficiencies, this source produces higher beam intensities than the EBPIS and charge exchange combination.
2Beam on target estimated to be 10% of that into the tandem for A<100 and 5% for A>100 assuming single stripping in the tandem. Double stripping reduces the beam intensity by a factor of 10 but should permit a more favorable initial charge state to be used.

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This file last modified Monday July 25, 2005