Elsevier

Nuclear Physics A

Volume 533, Issue 2, 21 October 1991, Pages 292-306
Nuclear Physics A

Production of polarized 12N with the 12C(p, 12N)n0 reaction

https://doi.org/10.1016/0375-9474(91)90491-NGet rights and content

Abstract

The polarization transferred to 12N in the 12C(p, 12N)n0 reaction has been measured at Ep = 50 and 72 MeV. In agreement with previous work, the 12N polarization was a strong function of the material in which the ions stop, implying a complex depolarization mechanism. The largest nuclear polarization observed, P0 = 0.260 ± 0.002, was for 12N implanted in Al. This result gives the lower bound Kyy1 ⩾ 0.377 ± 0.003 for the transverse polarization-transfer coefficient. Distorted-wave calculations predict Kyy1 should be approximately 23. The angular distribution of Kyy1 at Ep = 72 MeV is nearly isotropic, in agreement with the distorted-wave prediction. The electronic polarization relaxation time T1 for 12N implanted in C, Al, Ni and Au was found to be approximately constant and much longer than the 12N half-life; viz, T1 = 0.150 ± 0.014 s.

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    Permanent address: Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.

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