Measurement of the mean free path of UCN in liguid and solid hydrogen and deuterium at various temperatures
In recent UCN transmission experiments on liquid and solid o-D2 we were able to successfully determine the UCN scattering cross sections in the low-energy range (3-14-311 and 3-14-351). In a forthcoming experiment (3-14-370) we plan to measure these cross sections for p-H2 (liquid, solid) as well. The above-mentioned UCN experiments are extremely time-consuming, as good statistics have to be achieved over the whole range of UCN energies (100...2000 neV). Hence, the data collection so far was possible for only 1 temperature per state (liquid, solid, p-H2, o-D2). We now want to determine the UCN mean free path length l_mfp = (n*sigma_tot)^-1 at a set of 3-4 temperatures in the liquid and the solid state for H2 and D2 each. In order to reduce the data acquisition time, we will take data in the region of the UCN flux maximum (v = 12.6m/s) only. Through this we will be able to better determine the life time tau_0 = l_mfp/v_UCN of UCNs in o-D2 and p-H2, which are known with insufficient accuracy at the moment. These data will enable us to better estimate the UCN density that can be achieved in UCN sources working with o-D2 (or p-H2) moderators at low temperatures.
Please note that you will need to login with your ILL credentials to download the data.
Download DataThe recommended format for citing this dataset in a research publication is in the following format:
Stefan Döge; GELTENBORT Peter; GUTSMIEDL Erwin; HILD Nicolas; Hingerl; JENKE Tobias; LAUSS Bernhard and MORKEL Christoph. (2017). Measurement of the mean free path of UCN in liguid and solid hydrogen and deuterium at various temperatures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-14-374
ILL has partnered with DataCite as the registration agency
for data persistent identifiers.