Considerations for μCF experiments with metastably spin-polarized D and T

Details Considerations for μCF experiments with metastably spin-polarized D and T Considerations for μCF experiments with metastably spin-polarized D and T

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aipc..181..199h&link_type=abstract

AIP Conference Proceedings, Volume 181, pp. 199-213 (1988).

Physics

Positronium, Muonium, Muonic Atoms And Molecules

Scientific paper

Highly spin-polarized D and T can be expected to modify muon catalyzed fusion (μCF) processes in important ways. Under appropriate conditions, the polarized reservoir induces repolarization of the muon during each fusion cycle, resulting in repeated selective hyperfine state occupation. The dependence of mesomolecular capture rates, cascading rates and fusion rates on spin (hyperfine state) can lead to different branchings in the evolutionary kinetics and possibly to modified fusion outcomes. In order to carry out most experiments on spin-dependence or to utilize polarized fuels, it is necessary for the polarized material to be removed from its production environment and retain its high polarization for a time period matched to the duration of the experiment. We describe here production of removable and transportable metastable highly spin-polarized D in HD and o-D2, with polarization lifetime in the solid and liquid phase sufficient for application of μCF experiments. For spin-polarized DT, HT, and ortho-T2, the polarization procedure, size of sample and duration of polariation are all less favorable than for D, and they have not as yet been developed to the extent of HD and D2. Nevertheless, several usage modes for DT, HT+HD, and D2+ortho-T2 appear feasible for μCF, including both external usage variants and in situ experiments with the sample remaining within the dilution refrigerator. The latter relaxes the metastability requirement on the polarized tritons, but restricts the sample triton content to less than 1 Ci because of heat load from the triton beta decay. The proposed investigations exploit a truly new parameter in the μCF process, and in view of the current advanced state of development of metastably highly spin-polarized D, the time for these studies is opportune.

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