Details

Autor(en) / Beteiligte

• Kalpakchieva, R.
• Maslov, V. A.
• Astabatian, R. A.
• Kulko, A. A.
• Lukyanov, S. M.
• Markarian, E. R.
• Oganessian, Yu. Ts
• Penionzhkevich, Yu. E.
• Skobelev, N. K.
• Sobolev, Yu. G.

Titel

Momentum distributions of {sup 4}He nuclei from the {sup 6}He and {sup 6}Li breakup

Ist Teil von

• Physics of atomic nuclei, 2007-04, Vol.70 (4)

Ort / Verlag

United States

Erscheinungsjahr

2007

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Experimental data on the momentum distributions of {sup 4}He nuclei originating from {sup 6}He and {sup 6}Li breakup on various targets are presented over a wide beam energy range. The experiment with {sup 6}He was performed at the DRIBs accelerator complex for radioactive beams at the Joint Institute for Nuclear Research (JINR, Dubna). The intensity of the {sup 6}He beam used was 5 x 10{sup 6} 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, {sigma} {approx} 28 MeV/c, confirms the presence of a halo in {sup 6}He. The measurements performed with {sup 6}Li beams of energy 18 and 46 MeV per nucleon at the U-400M accelerator yielded a width value of {sigma} {approx} 50 MeV/c for the momentum distributions of {sup 4}He nuclei, which is intermediate between that for {sup 6}He 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.