Study of charge symmetry in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">He</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>4</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> by simultaneous <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">He</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>4</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>(e,e’p<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mo>)</mo></mrow><mrow><mn>3</mn></mrow></msup></mrow></math>H and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">He</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>4</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>(e,e’n<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mo>)</mo></mrow><mrow><mn>3</mn></mrow></msup></mrow></math>He measurements

M. Spahn; Th. Kihm; K. T. Knöpfle; J. Friedrich; N. Voegler; Ch. Schmitt; V. H. Walther; M. Unkelbach; H. M. Hofmann

doi:10.1103/PhysRevLett.63.1574

Study of charge symmetry in ${}^{4}{He}$ by simultaneous ${}^{4}{He}$ (e,e’p $)^{3}$ H and ${}^{4}{He}$ (e,e’n $)^{3}$ He measurements

M. Spahn, Th. Kihm, K. T. Knöpfle, J. Friedrich, N. Voegler, Ch. Schmitt, V. H. Walther, M. Unkelbach, and H. M. Hofmann

Phys. Rev. Lett. 63, 1574 – Published 9 October 1989

Abstract

We have measured the $(^{3}$ H+p) and $(^{3}$ He+n) breakup of ${}^{4}{He}$ by ${}^{4}{He}$ (e,e’c) coincidence experiments at low momentum transfer (q≊0.39 ${fm}^{- 1}$ ) in the excitation energy region 22≤ $E_{x}$ ≤36 MeV. Both channels were studied simultaneously by detecting the charged fragments c=p, ${}^{3}H$ , and ${}^{3}{He}$ in the same detector system. The measured ${}^{4}{He}$ (e,e’p $)^{3}$ H and ${}^{4}{He}$ (e,e’n $)^{3}$ He angular correlations as well as the deduced total ${}^{4}{He}$ (e,e’p $)^{3}$ H and ${}^{4}{He}$ (e,e’n $)^{3}$ He cross sections are reproduced by microscopic model calculations with a charge-symmetric nuclear Hamiltonian.