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The paper describes physics implications obtained through the recent experimental results on D–T μCF at RIKEN-RAL. Smaller sticking and larger cycling rates in solid/liquid D–T mixture than the theoretical predictions were observed, suggesting needs of further theoretical understandings. Some possible future directions in D–T μCF experiments are also described. [ABSTRACT FROM AUTHOR]

X-ray and neutron measurements were carried out for muon catalyzed fusion and related phenomena in solid T2. The X-ray originated from the μ- to α sticking in muon catalyzed fusion; t + t + μ - → ( μ - α) + 2 n was measured for the first time, yielding K α X-ray intensity of (μα) atom and the intensity ratio of K β to K α . Utilizing the phenomena of 3He accumulation in solid T2, the X-ray in the μ- transfer process from ( tμ) to 3He was detected, providing a formation rate and radiative decay branching-ratio of ( t 3Heμ) molecule. From fusion neutron measurements, estimated values were obtained for ( ttμ) molecular formation rate as well as sticking probability ωt in ttμ fusion. A possible new insight in t + t fusion reaction process at a low energy limit is also obtained. [ABSTRACT FROM AUTHOR]

At the RIKEN-RAL Muon Facility, μ- to α sticking K β X-rays were observed for the first time taking advantage of the pulsed beam structure. The precision of the present measurements was insufficient to distinguish between theoretical models, however the observed K β / K α X-ray intensity ratio tends to be smaller than most of these theoretical predictions. [ABSTRACT FROM AUTHOR]

We measured the yields of K-series X-rays from (αμ)+ ion formed by muon to alpha sticking as well as the yields and the disappearance rates of fusion neutrons in 3He-free solid and liquid D-T mixtures. The effective sticking probability ωs obtained by neutron measurement is much smaller than any theoretical values so far published, while the discrepancy in αμ X-ray yield seems less significant. [ABSTRACT FROM AUTHOR]

We successfully observed clear K-series kaonic hydrogen X-rays for the first time taking advantage of two charged pions tagging technique and a gaseous hydrogen target. The strong-interaction energy shift and width of 1s state of K −p atom were determined to be Δ E 1 s = -323 ± 63 (statistical) ± 11 (systematic) eV and Г1s = 407 ± 208 ± 100 eV. Our result means that the K −p strong interaction near threshold is repulsive and the long-standing kaonic hydrogen puzzle is solved. [ABSTRACT FROM AUTHOR]

For muon catalyzed fusion (μCF) experiments at RIKEN-RAL muon facility, a tritium gas handling system for a high purity D–T target, free from 3 component, has been constructed to perform precise measurements of α-sticking probability in the μCF cycle. The system has been constructed to enable us to purify the target D–T gas by removing 3He component, to adjust the D/T mixing ratio, and to measure the hydrogen isotope components at the experiment site. The whole performance has been confirmed and a tritium gas with the inventory of 56 TBq (1500 Ci) has been operated in the system. [ABSTRACT FROM AUTHOR]

This article reports the accumulation effect of the 3He originating from tritium β decay; 3He created in solid remains in it, while one in liquid diffuses and goes out to the vapor gas. We observed this effect through the neutron detection from muon catalyzed fusion phenomenon (μCF), and gave it qualitative understanding, by which the muon transfer rate from (dμ) and (tμ) to helium was derived. [ABSTRACT FROM AUTHOR]