Speaker
Dr
Juan Carlos Zamora Cardona
(NSCL)
Description
Charge-exchange reactions at intermediary energies is a powerful tool to study
spin-isospin excitations in nuclei. In particular, these type of reactions
serve as a direct method for the extraction of the Gamow-Teller (GT) transition
strengths which are of importance for a variety of applications where
weak transition strengths play a role (e.g. electron capture and $\beta$-decay
in stellar evolution, neutrino nucleosynthesis, etc.). GT transitions in the
$\beta^+$ direction have been studied extensively through $(t,{}^{3}\text{He})$
charge-exchange reactions. The $(d,{}^{2}\text{He})$ reaction is another and
potentially even more powerful probe for measurements of
$B(\text{GT}^+)$ strengths, since the detection of ${}^{2}$He (two protons in
the relative singlet ${}^{1}S_0$ state) ensures automatically that the reaction
goes through spin-flip components. However, the major disadvantage lies in the
detection and kinematic reconstruction of the ${}^{2}$He particle. The AT-TPC,
a detector based on time projection chamber, provides a unique technique for
achieving these type of experiments. Feasibility studies of
$(d,{}^{2}\text{He})$ reactions using this technique have been done with
GEANT4 simulations. In this contribution, the current status of the project
will be presented.
Primary author
Dr
Juan Carlos Zamora Cardona
(NSCL)