TRIAC Progress Report - KEK

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Fig.3-24. γ ray energy spectra coincident with SSD (solid line) and accidentally coincident with SSD (dashed line). Fig. 3-25. Set-up for the Coulex experiment. The set-up used for the 130 Ba experiment is given schematically as an inset. The picture of the set-up at the experimental hall is also given, where part of 10 NaI(Tl) detectors surrounding the target (here Vanadium target) are visible. An annual SSD is installed in the chamber downstream of the target. The beam passing through the target is monitored a plastic scientillator for beta-decaying 142 Ba beam installed at the position of the FC for the stable 130 Ba beam. Figure 3-24 shows two γ-ray energy spectra measured by three NaI(Tl) detectors with different timing gates. Solid line indicates the γ rays which were coincident with 78
the SSD, while dashed line represents the accidentally coincident γ rays; only a peak around the energy of 360 keV was clearly observed as expected. Comparison of the cross sections between elastic and inelastic scatterings yielded the B (E2;2 + 0 + ) = 0.97 (22) e 2 b 2 , which was in good agreement with the adopted value of 1.163(16) e 2 b 2 . The beam development of 142 Ba was also performed independently. The beam intensity can be expected to be several 10 3 particles/s at the secondary target. The measurement of B(E2) value of the 2 + 1 state of 142 Ba is scheduled to be carried out soon. For the experiment, the number of NaI(Tl) in increased from 6 to 10, by which the detection efficiency for γ-rays of 360 keV becomes 14 %. The experimental set-up is shown in Fig. 3-25. 3-3. Materials science <strong>TRIAC</strong> can provide low-energy radioactive ion beams ranging from 2 keV/nucleon to 1.1 MeV/nucleon with a small beam size, for example less than 10 mm in diameter, but still with intensity high enough for experiments. Thanks to these characteristics, we can implant the RIBs into samples of interest, usually small in size, with an implantation depth well-suited for specific experimental requirement. Over more than half a century, diffusion studies in solids using radioactive tracers [3-31] have played an important role in understanding the underlying mechanism of atomic transport in solids, which is of great importance in a number of branches of materials science and engineering. Although the conventional radiotracer method for diffusion studies in conjunction with a serial sectioning technique [3-32] has yielded the most accurate diffusion coefficients, the method has not yet been applied for some elements because of no-availability of radiotracers with adequate lifetimes. Among them, 8 Li, the radioactive isotope of Li with a half-life of 0.84 s is of special interest for practical issues; how well Li ions move in the secondary Li ion batteries. Fast Li diffusion is desirable in battery materials, i.e., Li ionic conductors for materials of electrodes and solid electrolyte. For studies on the macroscopic diffusivity of Li in Li ionic conductors, various electro-chemical methods [3-33] have been usually adopted up to now. However, the diffusion coefficients are scattered over several orders of magnitude, strongly depending on the method used for the measurement [3-34]. Therefore, the diffusion coefficients measured in different ways, e.g. by using the radiotracer of Li, are highly required to settle down such disagreements. Such an experimental knowledge on the Li diffusion in as-developed materials for the battery is also of importance in the recent general efforts to design the battery by simulations based on the first principle. 79
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TRIAC Progress Report TRIAC collabo
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i KEK Progress Report 2011-1 June 2
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PREFACE The Tokai Radioactive Ion A
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1. Introduction Following the succe
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maximum available beam power for th
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container of ion source and uranyl
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gaseous and volatile elements (e.g.
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= 10.6 m) were 4.5 %, that for 146
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with different plasma volumes [2-6]
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ECR plasma: We used natural helium
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higher efficiency for gaseous eleme
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The asymmetric component representi
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ut differs from the electron-loss p
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consumption in the cavity is less t
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measured with Faraday cups, FC1, FC
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y turning off the supply of RF powe
Page 33 and 34: Encouraged by the new finding, as t
Page 35: 2-4-4. Development of superconducti
Page 40 and 41: accelerating the radioactive ion be
Page 42 and 43: Fig. 2-29. Photos of the pre-bunche
Page 44 and 45: For the proposed experiment, the po
Page 46: a diagonal direction. The monitors
Page 49: charge state of xenon ions by using
Page 52 and 53: electrode as shown in Fig. 2-40) sh
Page 54 and 55: CO2 (10 %) and 16 kPa, respectively
Page 56 and 57: Although the gain shift of THGEM#3
Page 58 and 59: 3. Experiments at the TRIAC Since t
Page 60 and 61: Fig. 3-1. Schematic view of the det
Page 62 and 63: -element abundances up to the third
Page 64: higher reliability of the experimen
Page 67 and 68: GEM-MSTPC among the accumulated dat
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Page 72 and 73: The process of nuclear polarization
Page 74 and 75: annealed platinum foil (stopper foi
Page 78 and 79: the observed CP-violating phenomena
Page 80 and 81: offline data analysis, about 1-Mega
Page 82 and 83: Secondary 9 Li ions extracted from
Page 86 and 87: In the experiments of RNB-J02/03 (S
Page 88 and 89: atio), a diffusion coefficient was
Page 91 and 92: Although the data for β-LiAl and
Page 93 and 94: In the experiment of RNB-K06 ((Spok
Page 95 and 96: difference spectra, more specifical
Page 97 and 98: Mass, which is one of the most fund
Page 99: gamma rays. 111 In, which decays to
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TRIAC Progress Report - KEK

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