Polarization of Ne-23, Al-24m,Al-25 and P-28 produced through single nucleon pickup and charge-exchange reactions at 100 AMeV

摘要

We measured the polarization of the beta-emitting Ne-23 (I-pi = 5/2(+), T-1/2 = 37.24 s) and Al-25(I-pi = 5/2(+), T-1/2 = 7.18 s) produced through the one nucleon pickup reactions and Al-24m(I-pi = 1(+), T-1/2 = 131 ms, E-ex = 426 keV) and P-28(I-pi = 3(+), T-1/2 = 270 ms) produced through charge-exchange reactions in the intermediate energy heavy ion collisions. We compared them with those from the projectile fragmentation process. The larger polarization seems to persistently be positive throughout the momentum distribution, and sharper momentum distributions suggest that nuclear friction mechanism is responsible for the polarization phenomena.