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Spin polarization of $^{34}$Al fragments produced by nucleon pickup at intermediate energies

Abstract : The polarization of ${34}$Al fragments, produced by single neutron pickup from a ${9}$Be target by a ${36}$S projectile at 77.5 MeV/nucleon, have been observed at GANIL via the detection of resonantly destroyed $\beta$-asymmetry. The reaction-induced polarization is deduced using a tentative spin/parity assignment for the $^{34}$Al ground state. A positive polarization was measured near the peak of the $^{34}$Al yield curve. A kinematical model based on the spectator-participant model for projectile fragmentation reactions has been extended in order to take into account the features of pickup reactions, i.e., the picked-up nucleon having an average momentum equal to the Fermi momentum and aligned along the incident beam direction. The trend-line in the observed spin-orientation is very well reproduced by this model.
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http://hal.in2p3.fr/in2p3-00025997
Contributor : Michel Lion Connect in order to contact the contributor
Submitted on : Tuesday, May 2, 2006 - 3:17:15 PM
Last modification on : Wednesday, December 1, 2021 - 2:34:27 PM

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K. Turzó, P. Himpe, D. L. Balabanski, G. Bélier, D. Borremans, et al.. Spin polarization of $^{34}$Al fragments produced by nucleon pickup at intermediate energies. Physical Review C, American Physical Society, 2006, 73, pp.044313. ⟨10.1103/PhysRevC.73.044313⟩. ⟨in2p3-00025997⟩

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