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論文

Gamow-Teller strengths of the inverse beta transition $$^{176}$$Yb$$rightarrow$$$$^{176}$$Lu for spectroscopy of proton-proton and other sub-MeV solar neutrinos

藤原 守; 秋宗 秀俊*; Van den Berg, A. M.*; Cribier, M.*; 大東 出*; 江尻 宏泰*; 藤村 寿子*; 藤田 佳孝*; Goodman, C. D.*; 原 圭吾*; et al.

Physical Review Letters, 85(21), p.4442 - 4445, 2000/11

 被引用回数:23 パーセンタイル:74.42(Physics, Multidisciplinary)

$$^{176}$$Yb$$rightarrow$$$$^{176}$$Luのガモフ・テラー遷移が 450MeV, 0$$^{circ}$$の($$^{3}$$He,t)反応で測定された。$$^{176}$$Ybに対しては二つの1$$^{+}$$準位が観測され、それぞれニュートリノ吸収に対して301keVと445keVのしきい値を与える。観測から得られた結果から、Ybを含んだニュートリノ検出器は太陽ニュートリノの観測に適していることがわかった。

口頭

Using a 3-D heat transport model (PeCUBE) to invert OSL- and ESR-derived rock cooling histories into erosion rate changes in the Hida Range of Japan

Anderson, L.*; Bartz, M.*; King, G.*; Fox, M.*; Herman, F.*; Stalder, N.*; Biswas, R.*; 末岡 茂; 塚本 すみ子*; Ahadi, F.*; et al.

no journal, , 

Optically stimulated luminescence (OSL) and electron spin resonance (ESR) thermochronometry have the potential to resolve continuous erosion histories from rapidly eroding settings. These thermochronometers are viable over the past few hundred thousand to a million years. These time periods are defined by persistent oscillations between warm and cold states. During the Quaternary, fundamental questions about the relationship between climate and erosion remain unanswered. With further development, the OSL and ESR thermochronometers could answer these questions. To realize this potential new strategies are required to invert low-temperature thermal histories for erosion rates. Here, we explore the use of PeCUBE (Braun, 2003), a three-dimensional finite-element model that simulates heat conduction and advection in the upper crust. As a training dataset we use cooling histories derived from eight samples from the Tateyama region in the Hida Mountains of Japan. The flexibility of PeCUBE allows us to quantify the role of time varying surface temperatures between glacial and interglacial periods. In high-relief settings the three-dimensionality of the topography, for example between valleys and ridges, can substantially perturb rock temperatures. PeCUBE allows us to quantify and remove these confounding topographic effects. We additionally explore the role of changing topographic relief on time varying thermal fields and erosion rates. Lastly, we explore a generous range of model parameters to quantify the sensitivity and robustness of our inversions.

口頭

Unravelling rock cooling histories of the Japanese Alps using ESR thermochronometry

Bartz, M.*; King, G.*; Anderson, L.*; Herman, F.*; 末岡 茂; 塚本 すみ子*; Ahadi, F.*; Gautheron, C.*; Delpech, G.*; Schwarz, S.*; et al.

no journal, , 

Electron spin resonance (ESR) thermochronometry has the potential to resolve continuous erosion histories from rapidly eroding settings over 10$$^{6}$$ time scales. These time periods are defined by persistent oscillations between warm and cold states. However, questions about the relationship between climate and erosion remain unanswered. We further develop ESR thermochronometry of quartz (Al and Ti centres) to answer these questions in the Tateyama region in the Hida Mountains of Japan. In the result, the Al and Ti centres in quartz can successfully be inverted to unravel rock cooling histories. As future work, all ESR signals will be converted together with OSL data, providing further constraints on their thermal histories.

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