Chin. Phys. B, 2010, Vol. 19(6): 062701    DOI: 10.1088/1674-1056/19/6/062701
 NUCLEAR PHYSICS Prev   Next

# The g-factors and magnetic rotation in 82Rb

Yuan Da-Qing, Zheng Yong-Nan, Zuo Yi, Fan Ping, Zhou Dong-Mei, Wu Xiao-Guang, Zhu Li-Hua, Li Guang-Sheng, XuGuo-Ji, Fan Qi-Wen, Zhang Xi-Zhen, Zhu Sheng-Yun
China Institute of Atomic Energy, Beijing 102413, China
Abstract  The g-factors of the intra-band states 12, 13, 14, 15 in a magnetic-rotational band built on the 11 state in 82Rb are measured for the first time by using a transient magnetic field-ion implantation perturbed angular distribution (TMF-IMPAD) method. The magnetic-rotational band in 82Rb is populated by the ^{60}Ni(^{27}Al,4pn)^{ 82}Rb reaction, and the time-integral Larmor precessions are measured after recoil implantation into a polarized Fe foil. The calculation of g-factors is also carried out in terms of a semi-classical model of independent particle angular momentum coupling on the basis of the four-quasiparticle configuration \pi ( {g_{9 / 2} } )^2 \otimes \pi (p_{3 / 2} ,f_{5 / 2} ) \otimes \nu ≤ft( {g_{9 / 2} } \right). The measured and calculated g-factors are in good agreement with each other. The g-factors and deduced shear angles decrease with the increase of spin along the band. This clearly illustrates the shear effect of a step-by-step alignment of the valence protons and neutrons in magnetic rotation. The semi-classical calculation also shows that the alignment of the valence neutron angular momentum is faster than that of the valence protons, which results in a decrease of g-factors with increasing spin. The present results provide solid evidence of the shear mechanism of magnetic rotation.
Received:  24 December 2008      Published:  15 June 2010
 PACS: 21.10.Ky (Electromagnetic moments) 21.10.Re (Collective levels) 25.75.-q (Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions)) 21.10.Hw (Spin, parity, and isobaric spin) 21.60.-n (Nuclear structure models and methods) 27.50.+e (59 ≤ A ≤ 89)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.~10435010 and 10375093).