Gamow-Teller 8 transitions

We have again utilized the Lanczos algorithm to compute the B strength function for the l3°Cd(0+) l30In(1 + ) Gamow-Teller transitions. Low-... 

S. Towner, "A Mass Dependence in Hindrance Factors for Favoured Gamow-Teller Transitions", to be published. 

In n times forbidden transitions AI=n,n+l and TtjTtf = (—1)". In the region 6 < log ft <9 both allowed and first forbidden P-transitions occur. For example, the P 0" and Na P 3 2 decays are allowed Gamow-Teller transitions, although they have rather large log ft values of 7.9 and 7.4, respectively. Second, third, and fourth forbidden transitions were observed rarely they are mainly in the region 10 < log ft. 

Fermi selection rules and Gamow-Teller (GT) selection rules are alternative sets of rules for allowed beta transitions both are currently believed to be valid, so that a transition allowed according to either set is actually allowed. 

This has contribution from the allowed transitions by Fermi and Gamow-Teller (GT) operators. They have the form... 

The Fermi and Gamow-Teller rules correspond respectively to the emission of an electron-neutrino pair in a singlet or triplet state. Convincing evidence has accumulated that transitions of the type 0->0, No and 0- 1, No both occur with high probability, so that the general beta-interaction may contain both scalar and tensor terms. 

Tvpe of transition Fermi rules Gamow-Teller rules ... 

The decay of He to the ground state of Li is superallowed and is the most important evidence for the Gamow-Teller type of coupling in beta-decay. The Fermi allowed decay which would be expected from He to its isobar state at 3.57 MeV in Li is just energetically impossible. No trace of gamma radiation in the He decay has been found, nor has any transition to the 2.189 MeV level (/ = 3 ) been seen. 

---