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Lifetime measurements in shape transition nucleus 188Pt

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Abstract.

Nuclear level lifetimes of high spin states in yrast and non-yrast bands of 188Pt nucleus have been measured using recoil distance plunger setup present at IUAC, Delhi. In the experiment nuclear states of interest were populated via 174Yb(18O,4n)188Pt reaction at a beam energy of 79MeV provided by 15 UD Pelletron accelerator. The extracted \(B(E2\downarrow)\) values show an initial rise up to \(4^{+}\) state and then a nearly constant behavior with spin along yrast band, indicating change of nuclear structure in 188Pt at low spins. The good agreement between experimental and TPSM model \(B(E2\downarrow)\) values up to \( 4^+\) state suggests an increase in axial deformation of the nucleus. The average absolute \(\beta_{2} = 0.20 (3)\) obtained from measured \(B(E2\downarrow)\) values matches well the values predicted by CHFB and IBM calculations for oblate (\( \beta_{2} \sim -0.19\)) and prolate (\(\beta_{2} \sim 0.22\)) shapes. As the lifetime measurements do not yield the sign of \( \beta_{2}\), no definite conclusion can be drawn on the prolate or oblate collectivity of 188Pt on the basis of present measurements.

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Authors and Affiliations

  1. Department of Physics and Astrophysics, University of Delhi, 110007, New Delhi, India

    Aman Rohilla, C. K. Gupta & S. K. Chamoli

  2. Inter University Accelerator Centre, Aruna Asaf Ali Marg, 110067, New Delhi, India

    R. P. Singh & S. Muralithar

  3. Department of Physics, Banaras Hindu University, 221005, Varanasi (U.P.), India

    S. Chakraborty & H. P. Sharma

  4. Department of Physics, Panjab University, 160014, Chandigarh, India

    A. Kumar & I. M. Govil

  5. Nuclear Physics Division, Bhabha Atomic Research Center, 400085, Trombay, Mumbai, India

    D. C. Biswas

Authors
  1. Aman Rohilla
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  2. C. K. Gupta
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  3. R. P. Singh
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  4. S. Muralithar
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  5. S. Chakraborty
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  7. A. Kumar
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  8. I. M. Govil
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  9. D. C. Biswas
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  10. S. K. Chamoli
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Correspondence to S. K. Chamoli.

Additional information

Communicated by R.K. Bhandari

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Rohilla, A., Gupta, C.K., Singh, R.P. et al. Lifetime measurements in shape transition nucleus 188Pt. Eur. Phys. J. A 53, 64 (2017). https://doi.org/10.1140/epja/i2017-12256-y

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