Null scattering alloy

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The simulation of the inelastic background relies in the incoherent approximation, as inelastic coherent effects are too complicated and cannot be presently considered [ 11 ]. In the above equation for Z E , the angular brackets stand for an average over the momentum transfer Q [ 17 ], and E has to be restricted to the region where single-phonon emission dominates.

In the TOSCA measurements the energy and momentum transfer are not independent and therefore the average over Q cannot be properly performed to obtain Z E. This introduces a systematic error which may be particularly severe at low Q , i.

Figure 11 displays the GDoS obtained for vanadium, as a test case. For comparison, the DoS reported in Ref. We see a very good agreement except in the region between 8 and 15 meV. Since vanadium is an incoherent scatterer, the incoherent approximation is exact and the origin of the broad peak between 8 and 15 meV is unclear. The GDoS of the different alloys are displayed in Fig.

The two aluminium alloys show remarkably similar GDoS Fig. The same observation applies to the two NiCrAl alloys Fig. The sharp peaks centred at about 12 meV shown by the GDoS of CuBe, NiCrAl, and MP35N Figs a, b, and c, respectively are suspicious, since they are very similar and reminiscent of the broad peak shown by vanadium at the same position.

However, LET measurements are somehow noisy in that dynamic region and therefore we did not use it for the other alloys. In any case, it seems reasonable to remove from the GDoS the peaks around 12 meV. The effective GDoS obtained from the measurements presented in this work seem very reasonable.

The continuous green line is the DoS reported in Ref. Temperature dependence of the magnetic DC susceptibility measured in constant magnetic field of Oe on cooling for some materials commonly used in the construction of high-pressure cells is shown in Fig. The data is presented as mass susceptibility on the same scale for comparison and might be useful as guidance for material selection for high-pressure cells used in particular for muon and inelastic neutron scattering.

There is another important aspect of magnetic properties of these materials associated with potential superconducting transitions, but this will require detailed measurements in low-temperature part of the range. The measurements performed at the ISIS facility allows us to estimate the background generated by the different alloys and thus to choose the appropriate material for each instrument.

As it follows from the research investigations, TAV6 as a new high-pressure cell material presents to be the best choice. TAV6 is an excellent addition to the existing high-pressure cell material portfolio with combined neutron and mechanic properties and achievable potential gains in respect to reducing material cell cross sections and increased maximum working pressures while obtaining the same sample space as traditional cells.

These cells have been successfully used in neutron experiments. The design and manufacture of a clamp cell prototype from TAV6 is underway. The measurements presented here have also been used to characterize the alloys so that they can be modelled in Monte Carlo simulations, with the goal of estimating the background and the signal-to-noise ratio in different situations.

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Evans and Z. Kibble, A. Ramirez-Cuesta, C. Project : Research council. Pressure-dependent structure of the null-scattering alloy Ti 0. N2 - The room temperature structure of the alloy Formula presented.

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