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

Gómez Hornillos, M. et al. (2009) γ-ray spectroscopy approaching the limits of existence of atomic nuclei: A study of the excited states of ¹⁶⁸Pt and ¹⁶⁹Pt. Physical Review C, 79(6), 064314. (doi: 10.1103/PhysRevC.79.064314)

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 Mo92(Kr78,2n) and Mo94(Kr78,3n) 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 Pt168 and Pt169. A γ-γ analysis has allowed a level scheme for Pt168 to be reported for the first time and the level scheme for Pt169 to be extended. The excitation energies of the proposed positive-parity yrast states of Pt168 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 Pt169.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: O'Donnell, Dr David
• Authors: Gómez Hornillos, M., O'Donnell, D., Simpson, J., Joss, D., Bianco, L., Cederwall, B., Grahn, T., Greenlees, P., Hadinia, B., Jones, P., Julin, R., Juutinen, S., Ketelhut, S., Labiche, M., Leino, M., Nyman, M., Page, R., Paul, E., Petri, M., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sapple, P., Sarén, J., Scholey, C., Sorri, J., Thomson, J., and Uusitalo, J.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review C
• Publisher: American Physical Society
• ISSN: 0556-2813
• ISSN (Online): 1089-490X