arXiv · 2001.09927
Search for muon catalyzed $d^3He$ fusion
Abstract
This report presents the results of an experiment aimed at observation of the muon catalyzed $^3\!He\;d$ fusion reaction $^3\!He + \mu\;d\to^3\!He\;\mu\;d\to^4\!He(3.66MeV)+p(14.64MeV)+\mu$ which might occur after a negative muon stop in the $D_2+^3\!He$ gas mixture. The basic element of the experimental setup is a Time Projection Chamber (TPC) which can detect the incoming muons and the products of the fusion reaction. The TPC operated with the $D_2 + ^3\~He (5%)$ gas mixture at $31K$ temperature. About $10^8$ $^3\!He\;\mu\;d$ molecules were produced with only 2 registered candidates for the muon catalyzed $^3\!He\;d$ fusion with the expected background $N_{bg}=2.2\pm 0.3$ events. This gives an upper limit for the probability of the fusion decay of the $^3\!He\;\mu\;d$ molecule $P_{F}(^3\!He\;\mu\;d)\leq 1.1\cdot 10^{-7}$ at 90% C.L. Also presented are the measured formation rate of the $^3\!He\;\mu\;d$ molecule $\lambda_{d3He}=192(3)\cdot 10^6 s^{-1}$ and the probability of the fast muon transfer from the excited to the ground state of the $\mu\;d$ atom $q_{1S}=0.80(3)$.
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V. D. Fotev, V. A. Ganzha, K. A. Ivshin, P. V. Kravchenko, P. A. Kravtsov, E. M. Maev, A. V. Nadtochy, A. N. Solovev, I. N. Solovyev, A. A. Vasilyev, A. A. Vorobyov, N. I. Voropaev, M. E. Vznuzdaev, P. Kammel, E. T. Muldoon, R. A. Ryan, D. J. Salvat, D. Prindle, M. Hildebrandt, B. Lauss, C. Petitjean, T. Gorringe, R. M. Carey, F. E. Gray. 2020-01-27. Search for muon catalyzed $d^3He$ fusion. https://arxiv.org/abs/2001.09927
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