Measurement of the UCN/VCN cross sections of liquid and solid para-hydrogen
In recent UCN transmission experiments on liquid and solid ortho-deuterium we could successfully determine the UCN scattering cross sections of ortho-D2 in the low energy range from 100 to 1000 neV (Exp.No. 3-14-311, 3-14-351). In continuation of our work we here propose to measure the UCN cross sections of liquid and solid para-hydrogen with improved precision due to the reduction of surface scattering from the windows of the sample cell. Para-hydrogen is a purely coherent scatterer in the UCN region as opposed to ortho-deuterium and therefore may show quite different UCN cross sections. The precision of existing experimental UCN data (Seiffert,1970) does not fullfil nowadays requirements that are neccessary for calculation and design of advanced UCN sources. Moreover there appeared new data for p-H2, that differ a factor of 3 from the Seiffert data base in the low energy region (E<1meV)[1,2], which makes a confirmation also in the UCN region mandatory and interesting. This proposal is part of the PhD-thesis "UCN scattering cross sections of the cold hydrogens", a collaboration between ILL Grenoble, Technische Univ. München/Germany and Universita degli Studi di Firenze/Italy.
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MORKEL Christoph; Stefan Döge; GELTENBORT Peter; GUARINI Eleonora; GUTSMIEDL Erwin; HILD Nicolas; Hingerl; JENKE Tobias and LAUSS Bernhard. (2016). Measurement of the UCN/VCN cross sections of liquid and solid para-hydrogen. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-14-370
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