New evidence for alpha clustering structure in the ground state band of 212Po

Ma. von Tresckow*, M. Rudigier, T.M. Shneidman, Th. Kröll, M. Boromiza, C. Clisu, C. Costache, D. Filipescu, N.M. Florea, I. Gheorghe, K. Gladnishki, A. Ionescu, D. Kocheva, R. Lică, N. Mărginean, R. Mărginean, K.R. Mashtakov, C. Mihai, R. E. Mihai, A. NegretC.R. Nita, A. Olacel, A. Oprea, S. Pascu, G. Rainovski, T. Sava, M. Scheck, P. Spagnoletti, C. Sotty, L. Stan, I. Stiru, S. Toma, A. Turturică, S. Ujeniuc

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Half-lives of the low-lying yrast states of 212Po have been measured using the delayed coincidence fast-timing method. We report on the first measurement of the 41+ half-life, as well as a new measurement of the 61+ half-life with improved accuracy compared to previous studies. The extracted lifetime of the 41+ and 61+ state have been determined to be 100(14) ps and 1.66(28) ns respectively. With these measurements, precise values are now available for the reduced transition strengths B(E2) of all ground state band levels in 212Po up to the first 8+ state, in particular B(E2; 41+→21+) = 9.4(13) W.u. and B(E2;61+→41+) = 8.7(15) W.u. Comparison of the new available data with an α-clustering model calculation provides evidence that the inclusion of the α-cluster degree of freedom significantly improves agreement with experimental data compared to earlier shell model calculations.

Original languageEnglish
Article number136624
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume821
Early online date6 Sep 2021
DOIs
Publication statusPublished - 10 Oct 2021

Keywords

  • 212Po
  • centroid shift method
  • lifetime measurement
  • α-clustering in nuclear

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