Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı 2

High Resolution Study of Gamow-Teller Transitions in the 46Ti(3he,t)46V Reaction
In both beta decay and charge exchange reactions the transitions take the same form since they are governed by the same (στ) operator although one is governed by the Weak interation and the other by the Strong interaction. Studies of the Gamow-Teller transitions (ΔS=1, ΔT=1) provide an excellent way to study nuclear structure. It is possible to study the Gamow Teller transition strengths (B(GT)) and measure their absolute values in beta decay but the range of transitions that can be studied is limited by the beta-decay Q-value. In contrast Charge exchange reactions face no such limitation and one can study transitions to excited states in the final nucleus up to high energy. However it is not possible to extract absolute B(GT) values in such studies. If however, one assumes isospin symmetry and studies mirror nuclei then one can use the measured B(GT) values in beta decay to normalise the B(GT) values obtained in charge exchange since the corresponding transitions in the two processes should have the same B(GT) value under this assumption. Charge exchange reactions studied at intermediate bombarding energies of 140 MeV per nucleon and 0⁰ allow one to extract the relative B(GT) values. These values can then be normalised to give absolute values using the measured half life from the corresponding beta decay. Such studies allow one to measure the excitation energies of states in the final nucleus in (3He,t) reaction and determine the B(GT) strengths of the transitions populating them. Such reactions can be studied at RCNP (Research Center for Nuclear Physics) OSAKA in high resolution (~ 35 KeV) with the Grand Raiden spectrometer. This thesis describes the study of Gamow-Teller transitions from the T_z= +1 ⁴⁶Ti nucleus to the T_z=0 46V nucleus  in the  ⁴⁶Ti(³He,t)⁴⁶V reaction. The ⁴⁶Ti(³He,t)⁴⁶V reaction was performed at the RCNP research centre and many excited states in ⁴⁶V were observed in the reaction in the high resolution spectra obtained.
  

BIÇAK Bilge

Danışman : Yard. Doç. Dr. Serda KECEL GÜNDÜZ

Anabilim Dalı : Fizik

Programı : Atom Ve Molekül Fiziği

Mezuniyet Yılı : 2014

Tez Savunma Jürisi : Yard. Doç. Dr. Serda KECEL GÜNDÜZ

Prof. Dr. Ayşen E.ÖZEL

Prof. Dr. Elif AKALIN

Doç. Dr. Kubilay BALCI

Prof. Dr. Sevim AKYÜZ