PHYS01200804001 Sohrab Abbas - Homi Bhabha National Institute
PHYS01200804001 Sohrab Abbas - Homi Bhabha National Institute
PHYS01200804001 Sohrab Abbas - Homi Bhabha National Institute
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A 124 mm wide symmetric {220} LLL IFM [158] fabricated by Prof. Rauch′s group at the<br />
Atominstitut in Vienna, with 50.4 mm gaps between successive blades operating at a Bragg angle<br />
of 38° for 2.36Å neutrons, constrains the maximum allowed thickness of the dual sample to 18 mm<br />
due to beam widening in the mirror blade. The source-wise contributions to b c /b c for the Si<br />
sample are listed in LHS of Table 4 for the Ioffe et al. experiment [127] and in RHS for our<br />
Table 4: Comparison between various b c /b c contributions at Ioffe et al. [127] and in the proposed<br />
experiments with dual Si-sample.<br />
Ioffe et al Source Proposed<br />
[111] [220]<br />
5.0 * 10 -5 Thickness: D 0.1 μm<br />
2.78 * 10-6<br />
(Precision grinding)<br />
9.0 * 10 -6 Phase: Ф = 0.3 o , typical 5.6 * 10 -7 9.1 * 10 -7<br />
2.2 * 10 -6 Air: ( N a b a /N)=9 * 10 -6 fm<br />
2.2 * 10 -6<br />
Eliminate: Vacuum expt<br />
1.1*10 -7 Rotation: δθ 0.01 o , typical 6.5*10 -8<br />
1.4 * 10 -7 Tilt: δγ 0.01 o , typical 1.5 * 10 -8<br />
3.7 * 10 -9 {Nd} Si = 6 * 10 6 cm -2 3.7 * 10 -9<br />
5.1 * 10 -5 Total 3.6 * 10 -6 3.7 * 10 -6<br />
Vacuum experiment 2.8 * 10 -6 2.9 * 10 -6<br />
105