GAMOW-TELLER STRENGTH OBSERVED IN THE TI-48(N,P)SC-48 REACTION - IMPLICATIONS FOR THE DOUBLE BETA-DECAY OF CA-48

Cross sections for the 48Ti(n, p) reaction have been measured at angles of 0°, 6°, and 12° at an energy of 200 MeV. The measurements are compared with results of DWIA calculations to obtain estimates of transition strengths for L = 0, 1, and ≥2 up to an excitation energy of 25 MeV. Gamow-Teller strength (L = 0) is peaked between 3 and 4 MeV excitation energy, with a significant distribution extending to about 12 MeV. The L = 1 strength is found mainly between 6 and 20 MeV while the cross section for transitions with L ≥2 increases from 10 MeV to the upper limit of the measurements. The distribution of Gamow-Teller strength is in poor agreement with theoretical distributions used to calculate the lifetime for double beta decay of 48Ca. © 1990.