The (d, t) Reactions on N=50 Nuclei

Abstract

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.