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Nuclear Structure of 98Ru using beta decay

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Title: Nuclear Structure of 98Ru using beta decay
Author: Valbuena Burbano, Sally
Department: Department of Physics
Program: Physics
Advisor: Garrett, Paul
Abstract: A recent survey of potential candidates for spherical vibrational motion concluded that very few passed the criteria; of those that did, 98,100Ru were the most promising. However, in part this may have been due to the lack of detailed spectroscopic data for 98,100Ru. In order to remedy this, we have performed a high- statistics measurement of the beta decay of 98,100Rh using the newly commissioned beta decay Tape Station at iThemba labs located near Cape Town, South Africa. Activity of 98Rh was produced using fusion evaporation reactions of 12C beams on an 89Y target, which was then transported from the irradiation station to a counting station. The counting station consisted of 4 clover-type HPGe, augmented by a TIGRESS detector, a plastic scintillator, and an in-vacuum Si(Li) detector. The decay of 98Rh to 98Ru was the first measurement to be completed on this facility. Very high-statistics data sets were collected for 98Ru, resulting in considerable expansions of their decay schemes. Several weak E2 transitions were newly observed. The E2 transition to the second 0+ state possesses the largest relative B(E2) value, strongly suggesting that the third 2+ state is a band member of the second excited 0+ band. We have also observed a candidate level for the 4+ rotational band member, suggesting that 98Ru possesses a more-deformed excited 0+ band coexisting with a less-deformed ground state.
Date: 2020-01
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