Experimental study of the halo nucleus {sup 6}He using the {sup 6}Li({gamma},{pi}{sup +}){sup 6}He reaction

Journal Article · Sun Apr 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.044311· OSTI ID:20995204

Harrington, N P; Branford, D; Foehl, K; Roche, E ^[1]; Annand, J R. M.; Livingston, K; McGreorge, J C; MacGregor, I J. D.; Monstad, K; Waddell, S; Watts, D P ^[2]; Beck, R; Hornidge, D; Reiter, A ^[3]; Grabmayr, P; Hehl, T; Martin, I; Moschini, F ^[4]; Young, S ^[5]

---

1. School of Physics, University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)
2. Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ (United Kingdom)
3. Institut fuer Kernphysik, Johannes-Gutenberg Universitaet, D-55099 Mainz (Germany)
4. Physikalische Institut, Universitaet Tuebingen, D-72076 Tuebingen (Germany)
5. Department of Physics, University of Surrey, Guildford GU2 7HX (United Kingdom)

The reaction {sup 6}Li({gamma},{pi}{sup +}){sup 6}He was studied over the angular range {theta}{sub {pi}}=40-150 degree sign with the aim of investigating the halo structure of {sup 6}He. Photons from a bremsstrahlung beam were tagged in the energy range E{sub {gamma}}=170-220 MeV at a resolution of {delta}E{sub {gamma}}=630 keV, and positively charged pions detected using high resolution stacked HpGe detectors. The measured angular distributions for the resolved {sup 6}He ground and 1.80 MeV excited states are compared to previous measurements and theoretical calculations based on the impulse approximation. It is deduced that the ground state rms radius of the {sup 6}He nucleus may be larger than previously thought and that the first excited 1.80 MeV state may also be a halo state.

• OSTI ID: 20995204
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BREMSSTRAHLUNG
EXCITED STATES
GROUND STATES
HELIUM 6
HIGH-PURITY GE DETECTORS
IMPULSE APPROXIMATION
KEV RANGE 100-1000
LITHIUM 6
MEV RANGE
NUCLEAR HALOS
PHOTONS
PIONS PLUS