Abstract
The nuclear spin alignments of the β-emitting fragments 12B(Iπ = 1+, T1/2 = 20.2 ms) and 13B(Iπ = 3/2-, T1/2 = 17.4 ms) produced in the 100A-MeV 13C, 15N + 9Be collisions respectively have been observed for the first time detecting asymmetric β-ray emission from these nuclei. By means of the spin manipulation technique based on the hyperfine interaction of B isotopes in TiO2, both the polarization P and the alignment A were determined reliably. The obtained P and A were significantly smaller than the expectation from the kinematical model. From the fact that the quenching factors for P and A are almost the same, there may be some depolarization mechanism in the collision process itself.
Original language | English |
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Pages (from-to) | 233-237 |
Number of pages | 5 |
Journal | Hyperfine Interactions |
Volume | 136-137 |
Issue number | 3-8 |
DOIs | |
Publication status | Published - 2001 |
Externally published | Yes |
Keywords
- Nuclear spin orientation
- Polarized nuclear beam
- Projectile fragmentation
- Reaction mechanism
- β-NMR
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics
- Condensed Matter Physics
- Physical and Theoretical Chemistry