Collective 2p-2h intruder states in 118Sn studied via beta decay of 118In using the GRIFFIN spectrometer at TRIUMF

K. Ortner*, C. Andreoiu, M. Spieker, G. C. Ball, N. Bernier, H. Bidaman, V. Bildstein, M. Bowry, D. S. Cross, M. R. Dunlop, R. Dunlop, F. H. Garcia, A. B. Garnsworthy, P. E. Garrett, J. Henderson, J. Measures, B. Olaizola, J. Park, C. M. Petrache, J. L. PoreK. Raymond, J. K. Smith, D. Southall, C. E. Svensson, M. Ticu, J. Turko, K. Whitmore, T. Zidar

*Corresponding author for this work

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The low-lying structure of semimagic 118Sn has been investigated through the
β decay of 118In(T1/2=4.45min) 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 γ-ray transitions with energies near 285 keV have been resolved from which the 2+intr.→0+intr. 284.52-keV transition was determined to have half of the previous branching fraction leading to a
B(E2;2+2→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 114,116Sn isotopes previously studied using the same theoretical model.
Original languageEnglish
Article number024323
JournalPhysical Review C
Issue number2
Publication statusPublished - 18 Aug 2020
Externally publishedYes


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