Investigation into the lowenergy

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Investigation into the low-energy structure of Ru
isotopes via g-factor measurements
Mike Taylor University of York
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• Motivation
• Experiment
• Results and
• Interpretation

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Motivation
Key Question

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Motivation
Key Question

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Mo Isotopes g(2 )
Mantica et al., PRC 63, 034312 (2001)
Z/A
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Z/A
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Ru Properties
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Z/A
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Experimental Details
Taylor et al. Phys. Lett. B 605, 265 (2005)

• WNSL Yale

• Beam Energy 230 MeV 96,98Ru, 227 MeV
  100-104Ru

• Mean velocity in Gd 4.44 0.02 v/v0

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Spectra 96Ru
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Spectra 96-104Ru
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Results
Using the Rutgers TF parametrisation
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Results Comparison
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Field Strength Validation
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Tgt2 0.5 mg/cm2 24Mg, 3.4 mg/cm2 Gd,
5.4 mg/cm2 Cu, M 1.85x106 Am-1
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Steady decrease in g towards collective limit
Z/A filling of ?d5/2
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Zhang et al., PRC 60, 054316 (1999)

• weak n-p coupling, dominant (74) p(1g9/2)4
  ?(2d5/2)2

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Shell Model Calculations
96Ru P. Halse, J. Phys. G 19, 1859 (1993)
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• s.p. in nature

• N56 subshell closure (Zr)

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n-p Interaction
1g7/2

• Ngt56 increased
• occupation of 1g7/2
• Strongest for SOP

2d3/2
3s1/2
2d5/2
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1g9/2
2p1/2
protons neutrons
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Ru
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Summary
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Collaborators
N. Benczer-Koller, G. Kumbartzki, G. Gürdal
Rutgers University, Piscataway, NJ, USA A. E.
Stuchbery Australian National University,
Canberra, Australia M. A. Bentley University of
York, York, UK V. Werner, J. Qian, R. Winkler,
A. Heinz, E. Williams, E. A. McCutchan, R.
Casperson, R. F. Casten WNSL, Yale University,
New Haven, CT, USA B. Shoraka University of
Surrey, Guildford, UK Z. Berant Nuclear Research
Centre Negev, Beer-Sheva, Israel R. Lüttke TU,
Darmstadt, Germany
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The End