TURZÓ, K.; HIMPE, P.; L. BALABANSKI, D.; BÉLIER, G.; BORREMANS, D.; M. DAUGAS, J.; GEORGIEV, G.; DE OLIVEIRA SANTOS, Francois; MALLION, S.; MATEA, I.; NEYENS, G.; E. PENIONZHKEVICH, Yu.; STODEL, C.; VERMEULEN, N.; YORDANOV, D.

doi:10.1103/PhysRevC.73.044313

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Physical Review C. 2006, vol. 73, p. 044313

American Physical Society

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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.< Leer menos

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nuclei with mass number 20 to 38

nuclear fragmentation

pick-up reactions

nuclear spin

polarisation in nuclear reactions and scattering

nuclear parity

nuclear energy levels

heavy ion-nucleus reactions

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

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