High-resolution study of Gamow-Teller excitations in theCa42(He3,t)

Abstract

High-resolution study of Gamow-Teller excitations in thê {42}Ca(^{3}He,t)^{42}Sc reaction and the observation of a "low-energy super-Gamow-Teller state"Phys. Rev. C 91, 064316

High-resolution study ofTz=+1→0Gamow-Teller transitions in theMg26(He

“…We report on the study of GT transitions from the T z = +1 nucleus 26 Mg leading to GT states up to E x = 18.4 MeV in the T z = 0 nucleus 26 Al using a (p,n)-type ( 3 He,t) reaction at 140 MeV/nucleon, where T z is the z component of isospin T defined by (N − Z)/2 (see Fig. 1).…”

“…The advantage of using ( 3 He,t) reactions is its better resolution. In 2003, E ≈ 50 keV (FWHM) was realized in the 26 Mg( 3 He,t) 26 Al reaction at 140 MeV/nucleon [10] 26 Na g.s. g.s.…”

“…

In order to study the T z = +1 → 0 Gamow-Teller (GT) transitions in the mass A = 26 system, a chargeexchange reaction 26 Mg( 3 He,t) 26 Al was performed at an incident energy of 140 MeV/nucleon and scattering angle at and near 0• , where T z is the z component of isospin T defined by (N − Z)/2. In this (p,n)-type reaction, it is expected that GT states with T = 0, 1, and 2 are excited.

…”

“…In order to study the T z = +1 → 0 Gamow-Teller (GT) transitions in the mass A = 26 system, a chargeexchange reaction 26 Mg( 3 He,t) 26 Al was performed at an incident energy of 140 MeV/nucleon and scattering angle at and near 0…”

“…The reduced GT transition strengths, B(GT), were derived assuming the proportionality between cross sections and B(GT) values. Standard B(GT) values were obtained form the 26 Si β decay, where the mirror symmetry of T z = ±1 → 0 GT transitions was assumed. The GT strength, as a whole, is divided in two energy regions: the region of up to 8.5 MeV and the higher-energy region of 8.5-12.8 MeV, where the strength in the latter region distributed like a resonance.…”