Abstract
Experimental data on the momentum distributions of 4He nuclei originating from 6He and 6Li breakup on various targets are presented over a wide beam energy range. The experiment with 6He was performed at the DRIBs accelerator complex for radioactive beams at the Joint Institute for Nuclear Research (JINR, Dubna). The intensity of the 6He beam used was 5 × 106 particles per second and its energy was 10 MeV per nucleon. The momentum distributions of breakup products were measured by means of the MSP-144 magnetic spectrometer. The distribution width was shown to be virtually independent of the target mass. A small value of this width, σ ∼ 28 MeV/c, confirms the presence of a halo in 6He. The measurements performed with 6Li beams of energy 18 and 46 MeV per nucleon at the U-400M accelerator yielded a width value of σ ∼ 50 MeV/c for the momentum distributions of 4He nuclei, which is intermediate between that for 6He and those for stable nuclei. A compilation of the widths of the momentum distributions of fragments originating from the breakup of various nuclei is presented versus the binding energy of one or two neutrons in these nuclei, the target mass and the projectile energy.
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Original Russian Text © R. Kalpakchieva, V.A. Maslov, R.A. Astabatian, A.A. Kulko, S.M. Lukyanov, E.R. Markarian, Yu.Ts. Oganessian, Yu.E. Penionzhkevich, N.K. Skobelev, Yu.G. Sobolev, 2007, published in Yadernaya Fizika, 2007, Vol. 70, No. 4, pp. 649–655.
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Kalpakchieva, R., Maslov, V.A., Astabatian, R.A. et al. Momentum distributions of 4He nuclei from the 6He and 6Li breakup. Phys. Atom. Nuclei 70, 619–625 (2007). https://doi.org/10.1134/S1063778807040023
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DOI: https://doi.org/10.1134/S1063778807040023