(d,t) reactions on N = 50 nuclei

Angular distribution of tritons in (d, t) reactions induced by 21.4 MeV deuterons on 88 Sr, 89 Y, 90 Zr and 92 Mo targets was measured to obtain the l -values and the spectroscopic factors of transitions. In the reaction on 88 Sr, all of the expected spectroscopic strengths for T < states are found for the transitions leading to 1g 9/2 , 2p 1/2 , 2p 3/2 , and 1f 5/2 shell-model states. In contrast with this situation, severe fragmentation of the strength as a function of proton numbers was found in the other isotones. Any apparent spectra for 1f 7/2 neutron shell-model orbit have not been observed so characteristic as for 1g 9/2 , 2p 1/2 , 2p 3/2 or 1f 5/2 orbits. The shell-model forbidden l =2 transitions to (2d 5/2 ) -1 states were observed in the 89 Zr and 91 Mo nuclei. From these strengths the amount of shell-model impurities in the ground-state correlation of the target N =50 nuclei is estimated as a function of proton numbers.

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