Radioactive core ions of microclusters, "snowballs" in superfluid helium

N. Takahashi, T. Shimoda, Y. Fujita, H. Miyatake, Y. Mizoi, H. Kobayashi, M. Sasaki, T. Shirakura, T. Itahashi, S. Mitsuoka, T. Matsukawa, N. Ikeda, S. Morinobu, D. J. Hinde, K. Asahi, H. Ueno, H. Izumi

Research output: Contribution to journalArticlepeer-review


Short-lived beta-ray emitters, 12B, sustaining nuclear spin polarization were introduced into superfluid helium. The nuclear polarization of 12B was observed via measurement of beta-ray asymmetry. It was found that the nuclear polarization was preserved throughout the lifetime of 12B (20.3 ms). This suggests that the "snowball", an aggregation of helium atoms produced around an alien ion, constitutes a suitable milieu for freezing-cut the nuclear spin of the core ion and that most likely the solidification takes place at the interior of the aggregation.

Original languageEnglish
Pages (from-to)351-358
Number of pages8
JournalHyperfine Interactions
Issue number1-4
Publication statusPublished - Dec 1996

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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