First Lifetime Results from a Systematic Study of Odd-Mass Neutron-Rich Nuclides Near A$\sim$110

ORAL

Abstract

Our understanding of the astrophysical r-process nucleosynthesis path relies strongly on input from nuclear models. The mass region surrounding A$\sim$110 is known to exhibit rapid structural evolution, however experimental data is lacking for nuclides away from stability making the prediction of important nuclear properties in the r-process region difficult. In this talk we report new pico-second lifetimes of excited states populated via beta decay of fission fragments produced at IGISOL in Jyv\"{a}skyl\"{a}, Finland. The measurements utilized triple coincidences ($\beta\gamma\gamma$) where two fast scinitillators (plastic for $\beta$ and LaBr$_3$ for $\gamma$) were used in conjunction with a HPGe detector. Details of the experimental technique will be highlighted along with the presentation of eight new lifetimes in $^{109}$Pd, which range between 10-1500 ps, representing the first results from a broad experimental campaign.

*This work was supported by the U.S. National Science Foundation under Grant No. PHY-0758100 and the Academy of Finland under the Centre of Excellence Programme 2006-2011 (Nuclear and Accelerator Based Physics Programme at JYFL).

Authors

  • B. Bucher

    • University of Notre Dame, Indiana, USA
  • H. Mach

    • Uppsala University, Sweden
  • A. Aprahamian

    • University of Notre Dame
  • M.K. Smith

    • University of Notre Dame
  • J. Rissanen

    • University of Jyv\"{a}skyl\"{a}, Finland
  • J. \"{A}yst\"{o}

    • University of Jyv\"{a}skyl\"{a}, Finland
  • T. Eronen

    • University of Jyv\"{a}skyl\"{a}, Finland
  • A. Jokinen

    • University of Jyv\"{a}skyl\"{a}, Finland
  • P. Karvonen

    • University of Jyv\"{a}skyl\"{a}, Finland
  • I.D. Moore

    • University of Jyv\"{a}skyl\"{a}, Finland
  • H. Penttil\"{a}

    • University of Jyv\"{a}skyl\"{a}, Finland
  • M. Reponen

    • University of Jyv\"{a}skyl\"{a}, Finland
  • A. Saastamoinen

    • University of Jyv\"{a}skyl\"{a}, Finland
  • C. Weber

    • University of Jyv\"{a}skyl\"{a}, Finland
  • G. Simpson

    • LPSC, Grenoble, France
  • D. Ghi\c{t}\u{a}

    • NIPNE, Bucharest-Magurele, Romania
  • W. Kurcewicz

    • University of Warsaw, Poland
  • B. Olaizola

    • Universidad Complutense de Madrid, Spain
  • E. Ruchowska

    • Soltan Institute for Nuclear Studies, \'{S}wierk-Otwock, Poland