
TY  - JOUR
A1  - Woods, CL 
A1  - Barker, FC 
A1  - Catford, WN 
A1  - Fifield, LK 
A1  - Orr, NA 
T1  - Experimental Investigation and R-matrix Analysis of Low-lying Levels in 5He and 5Li
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1988
VL  - 41
IS  - 4
SP  - 525
EP  - 544
KW  - 
UR  - https://doi.org/10.1071/PH880525 
N2  - The ~cle-unstable nuclei SHe and Su have been studied via the 4He<,U,6U)SHe and 4He( Li,6He)SU stripping reactions at beam energies of 50 MeV and the 6U(12C, 13N)SHe and 6Li(13C, 14C)SU pickup reactions at 90 MeV. The experimental data clearly demonstrate a dependence of the lineshapes on the method of production of the mass-5 nuclei (in this case pickup or stripping). The observed lineshapes were analysed using the R-matrix formalism in a two-level approximation for each r value, with parameter values deduced from fits to the available 4He + nucleon scattering data. A best channel radius of 5·5 ± 1· 0 fm was determined from the stripping data, and the corresponding set of R-matrix parameters also provided a satisfactory description of the pickup data. This channel radius is significantly larger than that employed in most previous analyses. Properties of the lowest ~ - and ! - sta~s of SHe and sU, observed via direct reactions, ate deduced from the parameter values. These properties are compared with results from earlier experimental analyses and the inferred properties of positive-parity states are compared with the results of recent shell-model calculations. 
ER  -

