<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>Q</mi></math>-Value Systematics for Isovector Giant Resonances Excited by (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi></math>,<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>n</mi></math>) Reactions on Zr, Nb, Mo, Sn, and Pb Isotopes

W. A. Sterrenburg; Sam M. Austin; R. P. DeVito; Aaron Galonsky

doi:10.1103/PhysRevLett.45.1839

$Q$ -Value Systematics for Isovector Giant Resonances Excited by ( $p$ , $n$ ) Reactions on Zr, Nb, Mo, Sn, and Pb Isotopes

W. A. Sterrenburg, Sam M. Austin, R. P. DeVito, and Aaron Galonsky

Phys. Rev. Lett. 45, 1839 – Published 8 December 1980

Abstract

The ( $p$ , $n$ ) reaction at 45 MeV is used to study two broad peaks found previously with the target ${}^{90}{Zr}$ . They have now been observed with all but one of seventeen targets from ${}^{90}{Zr}$ to ${}^{208}{Pb}$ . Energy systematics favor the conclusion that these peaks are antianalogs of the giant $M 1$ and $E 1$ resonances in the target nucleus. The first experimental determinations of $T$ , $T - 1$ splittings of the giant $E 1$ resonance are reported. Their low values in comparison to $T$ , $T + 1$ splittings observed previously can be interpreted as due to a tensor part of the effective isospin potential.