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Phys. Rev. C 65, 034306 (2002) [8 pages]

Dissociation of 6He

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J. Wang *, A. Galonsky, J. J. Kruse †, E. Tryggestad, R. H. White-Stevens, and P. D. Zecher ‡
National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321

Y. Iwata § and K. Ieki
Department of Physics, Rikkyo University, 3 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan

Á. Horváth, F. Deák, and Á. Kiss
Department of Atomic Physics, Eötvös Loránd University, Pázmány P. sétány 1/A, H-1117 Budapest, Hungary

Z. Seres
KFKI Research Institute for Particle and Nuclear Physics, Konkoly-Thege út 29-33, P.O. Box 49, H-1525 Budapest 114, Hungary

J. J. Kolata and J. von Schwarzenberg **
Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556-5670

R. E. Warner
Department of Physics, Oberlin College, Oberlin, Ohio 44074

H. Schelin
CEFET, Av. Sete de Setembro 3165 80230-901, Curitiba, Pr, Brazil

Received 13 September 2001; published 13 February 2002

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.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.65.034306
DOI: 10.1103/PhysRevC.65.034306
PACS: 21.10.Gv, 25.75.Gz, 25.70.De, 25.60.Gc

* Present address: American Express Co., 3WFC, 4502, 200 Vesey Street, New York, NY 10285.
† Present address: Radiation Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905.
‡ Present address: Investor Analytics LLC, 80 Broad St., 22nd Floor, New York, NY 10004.
§ Present address: National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
** Present address: University of Vienna, Waehringer Strasse 17, A-1090 Vienna, Austria.

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