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

Abstract

Angular distribution of tritons in (d, t) reactions induced by 21.4 MeV deuterons on ⁸⁸Sr, ⁸⁹Y, ⁹⁰Zr and ⁹²Mo targets was measured to obtain the l-values and the spectroscopic factors of transitions. In the reaction on ⁸⁸Sr, 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 ⁸⁹Zr and ⁹¹Mo 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.