Correlation effects in pion double charge exchange in the shell

Nuclear Spin Physics via Polarization Measurements

“…Thus we can expect naively that the missing strength would be found as the DGT resonance predicted thirty years ago [49]. For the double IAS, the (π + , π − ) reaction successfully observed at E x = 17.38 MeV [50]. However, this probe is almost insensitive for the excitation of the double spin-flip GT state.…”

Double charge-exchange phonon states

“…The experimental value of the DIAS energy measured from the ground state of 48 Ca is taken from Ref. [3]. Values are given in MeV.…”

“…with the parameter z 0 fixed to −1 and u 0 = 25.8 ± 0.4 MeV fm 3 , fitted to reproduce ISB effects in symmetric nuclear matter as calculated using the Brueckner-Hartree-Fock approach [16] and the realistic nucleonnucleon interaction AV18 [15]. In Eq.…”

“…In the 1980s, DCX reactions were performed by using pion beams, i.e., (π + , π − ) and (π − , π + ) reactions have been studied. Through these experimental investigations, the DIAS, the dipole giant resonance built on the isobaric analog state (IAS) and the double dipole resonance states were identified [3][4][5][6]. However, the DGTRs were not found in the pion double chargeexchange spectra.…”

Population ofT<states in pion double charge exchange atTπFortune 1994Phys. Rev. C0000View full textAdd to dashboardCite

“…We have selected only those experimental results [3,4,8,9] in which the measured missing-mass histogram covers most or all of the region between the g. s. and the DIAS.…”