학술논문
Collective 2p-2h intruder states in $^{118}$Sn studied via $\beta$-decay of $^{118}$In using GRIFFIN
Document Type
Working Paper
Author
Ortner, K.; Andreoiu, C.; Spieker, M.; Ball, G. C.; Bernier, N.; Bidaman, H.; Bildstein, V.; Bowry, M.; Cross, D. S.; Dunlop, M. R.; Dunlop, R.; Garcia, F. H.; Garnsworthy, A. B.; Garrett, P. E.; Henderson, J.; Measures, J.; Olaizola, B.; Park, J.; Petrache, C. M.; Pore, J. L.; Raymond, K.; Smith, J. K.; Southall, D.; Svensson, C. E.; Ticu, M.; Turko, J.; Whitmore, K.; Zidar, T.
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Abstract
The low-lying structure of semi-magic $^{118}$Sn has been investigated through the $\beta$-decay of $^{118}$In ($T_{1/2}=4.45$ min) to study shape coexistence via the reduced transition probabilities of states in the 2p-2h proton intruder band. This high-statistics study was carried out at TRIUMF-ISAC with the GRIFFIN spectrometer. In total, 99 transitions have been placed in the level scheme with 43 being newly observed. Three low-lying $\gamma$-ray transitions with energies near 285 keV have been resolved from which the 2$^+_{\mathrm{intr.}} \rightarrow 0^+_{\mathrm{intr.}}$ 284.52-keV transition was determined to have half of the previous branching fraction leading to a $B(E2;2^+_2\rightarrow 0^+_2)$ of 21(4) W.u. compared to 39(7) W.u. from the previous measurement. Calculations using $sd$ IBM-2 with mixing have also been made to compare the experimental $B(E2)$ values to the theoretical values and to make comparisons to the $^{114,116}$Sn isotopes previously studied using the same theoretical model.