Nuclear spin orientation of 12,13B created in heavy ion collisions

✍ Scribed by T. Nagatomo; K. Matsuta; K. Akutsu; T. Iwakoshi; Y. Nakashima; T. Sumikama; M. Ogura; M. Mihara; H. Fujiwara; S. Kumashiro; K. Minamisono; T. Minamisono; M. Fukuda; M. Miyake; S. Momota; Y. Nojiri; A. Kitagawa; M. Sasaki; M. Torikoshi; M. Kanazawa; M. Suda; S. Sato; M. Hirai; T.J.M. Symons; G.F. Krebs; J.R. Alonso; S.Y. Zhu; J.Z. Zhu; Y.J. Xu; Y.N. Zheng

• Book ID: 104069152
• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 150 KB
• Volume: 746
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2004.09.078

✦ Synopsis

The momentum dependences of the nuclear spin polarization P and alignment A of 12 B (I π = 1 + , T 1/2 = 20.20 ms) [ 13 B (I π = 3/2 -, T 1/2 = 17.36 ms)] produced in 100A MeV 13 C [ 15 N] + Be collisions have been measured by detecting the β-ray asymmetry. Because both the P and A were significantly smaller than the prediction from a simple kinematical model, some depolarization mechanisms must be taken into account related with the collision process itself. Comparing the signs of the observed alignment of 12 B and 13 B, the sign of the quadrupole moment Q( 13 B) was determined to be positive.