Lifetime Measurements and Deformation in $^{79}$Sr

POSTER

Abstract

High-spin states in $^{79}$Sr were produced following the $^{54}$Fe($^{28}$Si, $2pn$) fusion-evaporation reaction using a beam energy of 90 MeV at the Florida State University (FSU) Tandem-Linac facility, and the resulting de-exciting $\gamma$ rays were detected with the FSU Ge array of 10 Compton-suppressed detectors. The $^{54}$Fe target was thick enough so that all of the synthesized nuclei could stop completely in the target, resulting in Doppler-shifted $\gamma$-ray line shapes that could be analyzed using the Doppler-shift attenuation method. In all, 23 lifetimes were measured in three separate band structures using this method, and then used to infer transition quadrupole moments ($Q_t$) and quadrupole deformations ($\beta_2$) using the rotational model. The results show good qualitative agreement with the predictions of both cranked Woods-Saxon (CWS) and projected shell model (PSM) calculations. The band based on a $d_{5/2}$ single-particle orbit, verified in this study through $\gamma - \gamma$ coincidences, intensity measurements, and directional correlation of oriented nuclei (DCO) ratios, was found to have the largest average deformation ($\beta _{2,{\rm ave}} = 0.41$) among the three bands, in agreement with the CWS and PSM predictions.

Authors

  • Y.K. Ryu

  • R.A. Kaye

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron