Polarization of B12 produced in induced14 reactions

K. H. Tanaka, Y. Nojiri, T. Minamisono, K. Asahi, and N. Takahashi
Phys. Rev. C 34, 580 – Published 1 August 1986
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Abstract

Nuclear spin polarization of projectile-like fragments B12 produced in (14N,12B) reactions at around the classical grazing angle was measured as a function of reaction Q value at incident energies of 120 and 200 MeV. Large positive B12 polarization was observed in the region of small kinetic energy loss for heavy target nuclei ranging from Th232 to Fenat, and it was interpreted in terms of direct two-proton transfer. For the target nucleus Al27, however, large negative polarization was observed in the region of small kinetic energy loss. It was found that the Sc45 target nucleus was situated at a crossover point for the sign of the polarization. This fact is explained by assuming coexistence of direct and frictional processes. It is found that the contribution of the frictional process tends to exceed that of the direct process with a decrease of target mass number in the region of small energy loss. In the region of large kinetic energy loss, the dominant mechanism is due to the frictional process. A friction constant of (2.4±0.5)×1022 MeV?fm2 is deduced from the present experimental data. This value agrees in order of magnitude with that obtained from the recent study on the reaction Xe + Bi.

  • Received 14 April 1986

DOI:https://doi.org/10.1103/PhysRevC.34.580

©1986 American Physical Society

Authors & Affiliations

K. H. Tanaka, Y. Nojiri, T. Minamisono, K. Asahi, and N. Takahashi

  • Laboratory of Nuclear Studies and Department of Physics, Faculty of Science, Osaka University, Toyonaka, Osaka, 560 Japan

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Issue

Vol. 34, Iss. 2 — August 1986

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