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Sökning: WFRF:(Kadono K)

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  • 2017
  • swepub:Mat__t
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  • Sakatani, N., et al. (författare)
  • Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body
  • 2021
  • Ingår i: Nature Astronomy. - : Springer Nature. - 2397-3366. ; 5:8, s. 766-774
  • Tidskriftsartikel (refereegranskat)abstract
    • Planetesimals—the initial stage of the planetary formation process—are considered to be initially very porous aggregates of dusts1,2, and subsequent thermal and compaction processes reduce their porosity3. The Hayabusa2 spacecraft found that boulders on the surface of asteroid (162173) Ryugu have an average porosity of 30–50% (refs. 4,5,6), higher than meteorites but lower than cometary nuclei7, which are considered to be remnants of the original planetesimals8. Here, using high-resolution thermal and optical imaging of Ryugu’s surface, we discovered, on the floor of fresh small craters (<20 m in diameter), boulders with reflectance (~0.015) lower than the Ryugu average6 and porosity >70%, which is as high as in cometary bodies. The artificial crater formed by Hayabusa2’s impact experiment9 is similar to these craters in size but does not have such high-porosity boulders. Thus, we argue that the observed high porosity is intrinsic and not created by subsequent impact comminution and/or cracking. We propose that these boulders are the least processed material on Ryugu and represent remnants of porous planetesimals that did not undergo a high degree of heating and compaction3. Our multi-instrumental analysis suggests that fragments of the highly porous boulders are mixed within the surface regolith globally, implying that they might be captured within collected samples by touch-down operations10,11.
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6.
  • Kalvius, GM, et al. (författare)
  • mu SR studies of magnetic correlations in Pt and Cu doped CeNiSn
  • 1997
  • Ingår i: PHYSICA B. - : ELSEVIER SCIENCE BV. - 0921-4526. ; 230, s. 655-657
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The development of magnetic correlations at low temperatures was studied by muon spin relaxation (mu SR) and specific heat measurements in CePtxNi1-xSn (x = 0.12, 0.2) and CeCuxNi1-xSn (x = 0.05, 0.1, 0.2). Doping with Pt up to 20% increases the magnetic
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7.
  • Kalvius, GM, et al. (författare)
  • The influence of impurities and alloying in the Kondo semimetal CeNiSn as seen by mu SR
  • 1997
  • Ingår i: HYPERFINE INTERACTIONS. - : BALTZER SCI PUBL BV. - 0304-3843. ; 104:1-4, s. 157-164
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The temperature dependence of the muon spin relaxation rate lambda was measured in two samples of CeNiSn with markedly different impurity content and in the quasi-ternary compounds CePtxNi1-xSn (x = 0.12, 0.2) and CeCuxNi1-xSn (x = 0.05, 0.1, 0.2) in orde
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  • Resultat 1-8 av 8

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