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decays of
At and expansion of the
Po level schemeBrunet, M.*; Podoly
k, Zs.*; Berry, T. A.*; Brown, B. A.*; Carroll, R. J.*; Lica, R.*; Sotty, Ch.*; Andreyev, A. N.; Borge, M. J. G.*; Cubiss, J. G.*; et al.
Physical Review C, 103(5), p.054327_1 - 054327_13, 2021/05
Times Cited Count:8 Percentile:59.99(Physics, Nuclear)
and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCALens, L.*; Yakushev, A.*; D
llmann, Ch. E.*; Asai, Masato; Ballof, J.*; Block, M.*; David, H. M.*; Despotopulos, J.*; Di Nitto, A.*; Eberhardt, K.*; et al.
Radiochimica Acta, 106(12), p.949 - 962, 2018/12
Times Cited Count:14 Percentile:71.97(Chemistry, Inorganic & Nuclear)Online gas-solid adsorption studies with single atom quantities of Hg, Tl, and Pb on SiO
and Au surfaces were carried out using short-lived radioisotopes with half-lives in the range of 4-49 s. This is a model study to measure adsorption enthalpies of superheavy elements Cn, Nh, and Fl. The short-lived isotopes were produced and separated by the gas-filled recoil separator TASCA at GSI. The products were stopped in He gas, and flushed into gas chromatography columns made of Si detectors whose surfaces were covered by SiO
or Au. The short-lived Tl and Pb were successfully measured by the Si detectors with the SiO
surface at room temperature. On the other hand, the Hg did not adsorb on the SiO
surface, but adsorbed on the Au surface. The results demonstrated that the adsorption properties of short-lived Hg, Tl, and Pb could be studied with this setup, and that this method is applicable to the experiment for Cn, Nh, and Fl.
Okada, Atsushi*; He, S.*; Gu, B.; Kanai, Shun*; Soumyanarayanan, A.*; Lim, S. T.*; Tran, M.*; Mori, Michiyasu; Maekawa, Sadamichi; Matsukura, Fumihiro*; et al.
Proceedings of the National Academy of Sciences of the United States of America, 144(15), p.3815 - 3820, 2017/04
MgLund, M. V.*; Andreyev, A. N.; Borge, M. J. G.*; Cederk
ll, J.*; De Witte, H.*; Fraile, L. M.*; Fynbo, H. O. U.*; Greenlees, P. T.*; Harkness-Brennan, L. J.*; Howard, A. M.*; et al.
European Physical Journal A, 52(10), p.304_1 - 304_14, 2016/10
Times Cited Count:21 Percentile:76.38(Physics, Nuclear)
H and H
L transitionsMiki, Kazuhiro; Diamond, P. H.*; Fedorczak, N.*; G
rcan,
. D.*; Malkov, M.*; Lee, C.*; Kosuga, Yusuke*; Tynan, G. R.*; Xu, G. S.*; Estrada, T.*; et al.
Nuclear Fusion, 53(7), p.073044_1 - 073044_10, 2013/07
Times Cited Count:26 Percentile:69.95(Physics, Fluids & Plasmas)Understanding the L
H and H
L transitions is crucial to successful ITER operation. In this paper we present novel theoretical and modelling study results on the spatio-temporal dynamics of the transition. We place a special emphasis on the role of zonal flows and the micro
macro connection between dynamics and the power threshold dependences. The model studied evolves five coupled fields in time and one space dimension, in simplified geometry. The content of this paper is (a) the model fundamentals and the space-time evolution during the L
I
H transition, (b) the physics origin of the well-known
B-drift asymmetry in power threshold, (c) the role of heat avalanches in the intrinsic variability of the L
H transition, (d) the dynamics of the H
L back transition and the physics of hysteresis.
L back transitionMiki, Kazuhiro; Diamond, P. H.*; Schmitz, L.*; McDonald, D. C.*; Estrada, T.*; G
rcan,
. D.*; Tynan, G. R.*
Physics of Plasmas, 20(6), p.062304_1 - 062304_9, 2013/06
Times Cited Count:20 Percentile:61.07(Physics, Fluids & Plasmas)Since ITER will operate close to threshold and with limited control, the H
L back transition is a topic important for machine operations as well as physics. Using a reduced mesoscale model, we investigate ELM-free H
L back transition dynamics in order to isolate transport physics effects. Model studies indicate that turbulence spreading is the key process which triggers the back transition. The transition involves a feedback loop linking turbulence and profiles. The I-phase appears during the back transition following a slow power ramp down, while fast ramp-downs reveal a single burst of zonal flow during the back transition. The I-phase nucleates at the pedestal shoulder, as this is the site of the residual turbulence in H-mode. Hysteresis in the profile gradient scale length is characterized by the Nusselt number. Relative hysteresis of temperature gradient vs density gradient is sensitive to the pedestal Prandtl number.
Miki, Kazuhiro; Diamond, P. H.*; Schmitz, L.*; McDonald, D. C.*; Gurcan, O.*; Tynan, G. R.*
no journal, ,
Since ITER will operate close to threshold and with limited control, the H-L back transition is a topic important for machine operations as well as physics. Using a reduced mesoscale model, we investigate ELM-free H-L back transition dynamics. Model studies indicate that turbulence spreading is the key process which triggers the back transition. The transition involves a feedback loop linking turbulence and profiles. The I-phase appears during the back transition following a slow power ramp down, while fast ramp-down reveal a single burst of zonal flow during the back transition. The I-phase nucleates at the pedestal shoulder, as this is the site of the residual turbulence in H-mode. Hysteresis in profile gradient is characterized by the Nusselt number. Relative hysteresis of temperature gradient vs density gradient is sensitive to the pedestal Prandtl number. We expect the H-mode to be somewhat more resilient in density than in temperature.
Mills, R.*; Fujii, Kazumichi*; Jassey, V.*; Heffernan, L.*; Koarashi, Jun; Mattiasen, C.*; Robroek, B.*; Buttler, A.*
no journal, ,
Currently, estimates of soil carbon stock and turnover in northern forest soils ignore, to a large extent, the variability of understory plant communities, and their contribution to the within-system heterogeneity that might occur. To explore how understory plant communities may explain soil carbon stock and turnover, we analysed podsol O-horizons for organic matter characteristics and microbial communities and functions across contrasting cover of functional groups in a nemo-boreal pine forest in southern Sweden. We found plant community cover and biomass to be a poor predictor of organic matter content and quality, and of the microbial community composition to be poorly related to both. The results imply a disconnection between plant community composition and longer-term soil carbon stores in complex systems on an ecosystem scale.