New lifetime measurements in $^{109}\mathrm{Pd}$ and the onset of deformation at $N=60$

New lifetime measurements in ${}^{109}{Pd}$ and the onset of deformation at $N = 60$

B. Bucher, H. Mach, A. Aprahamian, G. S. Simpson, J. Rissanen, D. G. Ghiţă, B. Olaizola, W. Kurcewicz, J. Äystö, I. Bentley, T. Eronen, L. M. Fraile, A. Jokinen, P. Karvonen, I. D. Moore, H. Penttilä, M. Reponen, E. Ruchowska, A. Saastamoinen, M. K. Smith, and C. Weber

Phys. Rev. C 92, 064312 – Published 14 December 2015

Abstract

Several new subnanosecond lifetimes were measured in ${}^{109}{Pd}$ using the fast-timing $β γ γ (t)$ method. Fission fragments of the $A = 109$ mass chain were produced by bombarding natural uranium with 30 MeV protons at the Jyväskylä Ion Guide Isotope Separator On-Line (IGISOL) facility. Lifetimes were obtained for excited states in ${}^{109}{Pd}$ populated following $β$ decay of ${}^{109}{Rh}$ . The new lifetimes provide some insight into the evolution of nuclear structure in this mass region. In particular, the distinct structure of the two low-lying $7 / 2^{+}$ states occurring systematically across the Pd isotopic chain is supported by the new lifetime measurements. The available nuclear data indicate a sudden increase in deformation at $N = 60$ which is related to the strong $p - n$ interaction between $π g_{9 / 2}$ and $ν g_{7 / 2}$ valence nucleons expected in this region.

1 More

Received 15 October 2015

DOI:https://doi.org/10.1103/PhysRevC.92.064312

Authors & Affiliations

B. Bucher^1,2,*, H. Mach^1,3,†, A. Aprahamian¹, G. S. Simpson⁴, J. Rissanen^5,‡, D. G. Ghiţă⁶, B. Olaizola^7,§, W. Kurcewicz⁸, J. Äystö^5,∥, I. Bentley^1,9, T. Eronen^5,¶, L. M. Fraile⁷, A. Jokinen⁵, P. Karvonen^5,#, I. D. Moore⁵, H. Penttilä⁵, M. Reponen⁵, E. Ruchowska³, A. Saastamoinen^5,**, M. K. Smith¹, and C. Weber^5,**

¹Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
²Lawrence Livermore National Laboratory, Livermore, California 94550, USA
³Division of Nuclear Physics, BP1, National Centre for Nuclear Research, ul. Hoża 69, 00-681, Warsaw, Poland
⁴LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
⁵Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
⁶National Institute for Physics and Nuclear Engineering, R-77125 Bucharest-Magurele, Romania
⁷Grupo de Física Nuclear, Facultad de Físicas, Universidad Complutense – CEI Moncloa, E-28040 Madrid, Spain
⁸Faculty of Physics, University of Warsaw, Pasteura 5, PL 02-093 Warsaw, Poland
⁹Department of Chemistry and Physics, Saint Mary's College, Notre Dame, Indiana 46556, USA

^*bucher3@llnl.gov
^†Deceased.
^‡Present address: Fennovoima Oy, Salmisaarenaukio 1, FI-00180 Helsinki, Finland.
^§Present address: Physics Department, University of Guelph, 50 Stone Rd E, Guelph, Ontario N1G 2W1, Canada.
^∥Present address: Helsinki Institute of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland.
^¶Present address: Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA.
^#Present address: Fortum Power Division, P.O. Box 100, FI-00048 Fortum, Finland.
^**Present address: Faculty of Physics, Ludwig-Maximilians University Munich, Am Coulombwall 1, D-85748 Garching, Germany.

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 92, Iss. 6 — December 2015

Reuse & Permissions

Access Options

Article Available via CHORUS

Download Accepted Manuscript

Author publication services for translation and copyediting assistance advertisement

Physical Review C

covering nuclear physics

New lifetime measurements in ${}^{109}{Pd}$ and the onset of deformation at $N = 60$

B. Bucher, H. Mach, A. Aprahamian, G. S. Simpson, J. Rissanen, D. G. Ghiţă, B. Olaizola, W. Kurcewicz, J. Äystö, I. Bentley, T. Eronen, L. M. Fraile, A. Jokinen, P. Karvonen, I. D. Moore, H. Penttilä, M. Reponen, E. Ruchowska, A. Saastamoinen, M. K. Smith, and C. Weber

Phys. Rev. C 92, 064312 – Published 14 December 2015

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Physical Review C

covering nuclear physics

New lifetime measurements in Pd109 and the onset of deformation at N=60

B. Bucher, H. Mach, A. Aprahamian, G. S. Simpson, J. Rissanen, D. G. Ghiţă, B. Olaizola, W. Kurcewicz, J. Äystö, I. Bentley, T. Eronen, L. M. Fraile, A. Jokinen, P. Karvonen, I. D. Moore, H. Penttilä, M. Reponen, E. Ruchowska, A. Saastamoinen, M. K. Smith, and C. Weber

Phys. Rev. C 92, 064312 – Published 14 December 2015

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Authorization Required

Other Options

Download & Share

Images

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Log In

Search

Article Lookup

Paste a citation or DOI

Enter a citation

New lifetime measurements in ${}^{109}{Pd}$ and the onset of deformation at $N = 60$