First results from CLARION2-TRINITY: Coulomb Excitation of <sup>49</sup>Ti and Emerging Collectivity
ORAL
Abstract
The first results from CLARION2-TRINITY, a new charged-particle and HPGe array are presented: Coulomb excitation of 49Ti. Ti-49 can be treated as a neutron hole plus semimagic 50Ti core within the particle-core coupling scheme. Reduced electric quadrupole transition probabilities, or B(E2) strengths, for the 2+×f7/2 multiplet members and 1p-2h 3/2- cross-shell excitation were measured. The total electric quadrupole strength of 49Ti is compared to the B(E2;0+→2+) of the 50Ti core in search of enhanced quadrupole collectivity, similar to that recently observed in 129Sb relative to a 128Sn core [1]. Both cases are near double-magic nuclei and have small core B(E2) values. The results are compared to shell-model calculations with state-of-the-art nucleon-nucleon interactions. Ti-49 shows a quenching of the total quadrupole excitation strength when compared to 50Ti, in disagreement with both particle-core coupling scheme, and empirical expectations. Reasons for this reduction in E2 strength will be discussed, including cross-shell excitations and large wavefunction fragmentation.
[1] T.J. Gray, et al., Phys. Rev. Lett. 124, 032502 (2020)
[1] T.J. Gray, et al., Phys. Rev. Lett. 124, 032502 (2020)
*This work is supported by the US Department of Energy UT-Battelle, LLC under Contract No. DE-AC05-00OR22725.
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Presenters
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Timothy Gray
- Oak Ridge National Laboratory