Dissociation of 6He

J. Wang, A. Galonsky, J. J. Kruse, E. Tryggestad, R. H. White-Stevens, P. D. Zecher, Y. Iwata, K. Ieki, Á Horváth, F. Deák, Á Kiss, Z. Seres, J. J. Kolata, J. Von Schwarzenberg, R. E. Warner, H. Schelin

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Abstract

The dissociation reaction 6He → α+ 2n was studied with 6He projectiles at 23.9 MeV/nucleon in targets of C, Al, Cu, Sn, Pb, and U. Relative to Al, the 2n removal cross section σ-2n with each of the other targets was determined. With U, the Coulomb part accounts for 2/3 of σ-2n. The widths of the α particle and neutron parallel momentum distributions increase with target Z. For the α particle, 6He dissociation on C gave width σ=40.2±2.3 MeV/c, corresponding to an rms radius of the halo neutrons of (2.95±0.17) fm, which is (0.35±0.17) fm larger than the rms radius of all four neutrons. The relation between the widths of the α particle and neutron distributions indicates only a small correlation between the two neutrons. This conclusion is supported by the distribution function for the angle between the two neutrons, which was obtained in kinematically complete measurements. The latter measurements with the U target also yielded an E1 strength function, and it agreed with one determined in an experiment at ten times our beam energy.

Original languageEnglish
Pages (from-to)343061-343068
Number of pages8
JournalPhysical Review C - Nuclear Physics
Volume65
Issue number3
Publication statusPublished - Mar 1 2002

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Wang, J., Galonsky, A., Kruse, J. J., Tryggestad, E., White-Stevens, R. H., Zecher, P. D., Iwata, Y., Ieki, K., Horváth, Á., Deák, F., Kiss, Á., Seres, Z., Kolata, J. J., Von Schwarzenberg, J., Warner, R. E., & Schelin, H. (2002). Dissociation of 6He. Physical Review C - Nuclear Physics, 65(3), 343061-343068.