Precise nuclear moments of 13B and the β-ray angular distribution

The nuclear moments of 13 B( I π = 3/2 − , T 1/2 = 17.36ms) have been re-measured precisely in order to establish the spin manipulation technique for the study of the alignment correlation term in mass system A = 13. From the β -NMR on 13 B in Pt, the magnetic moment was determined as | μ ( 13 B)| = 3.1778(5) μ N . From the β -NQR on 13 B in TiO 2 , the Q moment has been determined as | Q ( 13 B)| = 36.6(8)mb. We have measured the alignment correlation term α _ E for 13 B β decay for the first time and obtained a preliminary result as α − ( 13 B) = 0.15(12)%/MeV.