gamma-ray spectroscopy approaching the limits of existence of atomic nuclei: a study of the excited states of Pt-168 and Pt-169

M. B. Gomez Hornillos, D. O'Donnell, J. Simpson, D. T. Joss, L. Bianco, B. Cederwall, T. Grahn, P. T. Greenlees, B. Hadinia, P. Jones, R. Julin, S. Juutinen, S. Ketelhut, M. Labiche, M. Leino, M. Nyman, R. D. Page, E. S. Paul, M. Petri, P. PeuraP. Rahkila, P. Ruotsalainen, M. Sandzelius, P. J. Sapple, J. Saren, C. Scholey, J. Sorri, J. Thomson, J. Uusitalo

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Abstract

Excited states in the N=90 and N =91 Pt nuclei have been investigated using the JUROGAM and GREAT spectrometers in conjunction with the RITU gas-filled separator. These nuclei were populated via the reactions 92Mo(78 Kr,2n) and 94Mo (78K,3n) at 335 and 348 MeV, respectively. The recoil-decay tagging technique has been used to correlate prompt γ radiation with the characteristic α decays of 168Pt and 169Pt. A γ−γ analysis has allowed a level scheme for 168Pt to be reported for the first time and the level scheme for 169Pt to be extended. The excitation energies of the proposed positive-parity yrast states of 168Pt are compared with calculations based on the interacting boson model and found to be in excellent agreement. These data show a continuation of the trend toward vibrational nuclei as the N=82 shell gap is approached. In addition, new excited states constituting two decay paths have been discovered in 169Pt .

Original languageEnglish
Article number064314
JournalPhysical Review C
Volume79
Issue number6
DOIs
Publication statusPublished - 15 Jun 2009
Externally publishedYes

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    Gomez Hornillos, M. B., O'Donnell, D., Simpson, J., Joss, D. T., Bianco, L., Cederwall, B., Grahn, T., Greenlees, P. T., Hadinia, B., Jones, P., Julin, R., Juutinen, S., Ketelhut, S., Labiche, M., Leino, M., Nyman, M., Page, R. D., Paul, E. S., Petri, M., ... Uusitalo, J. (2009). gamma-ray spectroscopy approaching the limits of existence of atomic nuclei: a study of the excited states of Pt-168 and Pt-169. Physical Review C, 79(6), [064314]. https://doi.org/10.1103/PhysRevC.79.064314