The degrees of polarization of proton rich nucleus 28P produced in charge exchange reactions 28Si + 9Be -> 28P + X, and 28Si + 1H -> 28P + X have been observed at 100A MeV. Utilizing thus obtained polarized nuclei, β-nuclear quadrupole resonance (β-NQR) of 28P implanted in Al2O3 have been observed for the first time. 28P is of our present interest, since this nucleus may develop proton halo structure, which may be possible from the rather shallow proton separation energy of 2.065 MeV, and was suggested from the rather large reaction cross section compared with the neighboring nuclei . In our previous study, the magnetic moment of 28P was determined precisely , which showed at least the dominance of the configuration with the s1/2 proton, which may develop proton halo. In the present work, we tried to measure the electric quadrupole moment of 28P.
The experimental procedure is similar to the previous work , the proton-rich 28P nuclei were produced and were polarized through charge exchange reactions 28Si + 9Be -> 28P + X, and 28Si + 1H -> 28P + X, at 100 A MeV, and were separated by a separator. They were then implanted in a Pt catcher cooled down to 15 K. The degree of polarization was measured by means of NMR utilizing β-ray asymmetric emission. Then the 28P nuclei were implanted in a single crystal Al2O3 and the NQR were observed as shown in Fig. 1. The polarization mechanism in these reactions and the quadrupole moment of 28P will be discussed at the meeting.
 Liu, Z.Z., Ruan, M., Zhao, Y.L., et al.: Phys. Rev., C 69, 034326 (2004).
 D.M. Zhou et al., Hyperfine Interact. 180, 37(2007); K. Matsuta et al., Nucl. Phys. A805, 359(2008).
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