Experimental investigation of shell-model excitations of ${}^{89}$Zr up to high spin

Experimental investigation of shell-model excitations of $^{89}$ Zr up to high spin

S. Saha, R. Palit, J. Sethi, T. Trivedi, P. C. Srivastava, S. Kumar, B. S. Naidu, R. Donthi, S. Jadhav, D. C. Biswas, U. Garg, A. Goswami, H. C. Jain, P. K. Joshi, G. Mukherjee, Z. Naik, S. Nag, V. Nanal, R. G. Pillay, S. Saha, and A. K. Singh

Phys. Rev. C 86, 034315 – Published 10 September 2012

Abstract

Near yrast states in $^{89}$ Zr were investigated up to high spin using the fusion evaporation reaction $^{80}$ Se( $^{13}$ C, 4 $n$ ) at an incident beam energy of 50 MeV. Excited levels of $^{89}$ Zr have been observed up to $\sim$ 10 MeV excitation energy and spin $\sim$ 37/2 $ℏ$ using the prompt gamma spectroscopy technique with the Indian National Gamma Array (INGA). The angular distribution, directional correlation, and polarization measurements were carried out to assign the spin and parity of the newly reported states. The structures of both the positive and negative parity states up to highest spin observed in the present experiment have been compared with shell-model calculations using two recently developed residual interactions, JUN45 and jj44b. The role of proton excitations from $p_{3 / 2}$ and $f_{5 / 2}$ orbitals to the $g_{9 / 2}$ orbital for the higher spin states has been discussed.

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Received 2 August 2012

DOI:https://doi.org/10.1103/PhysRevC.86.034315

Authors & Affiliations

S. Saha¹, R. Palit^1,*, J. Sethi¹, T. Trivedi¹, P. C. Srivastava², S. Kumar³, B. S. Naidu¹, R. Donthi¹, S. Jadhav¹, D. C. Biswas⁴, U. Garg⁵, A. Goswami⁶, H. C. Jain¹, P. K. Joshi^1,†, G. Mukherjee⁷, Z. Naik⁸, S. Nag⁹, V. Nanal¹, R. G. Pillay¹, S. Saha⁶, and A. K. Singh⁹

¹Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
²Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, 04510 México, Distrito Federal, Mexico
³Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India
⁴Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
⁵Physics Department, University of Notre Dame, Notre Dame, Indiana 46556, USA
⁶Saha Institute of Nuclear Physics, Kolkata 700064, India
⁷Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700064, India
⁸Physics Department, Sambalpur University, Sambalpur 768019, India
⁹Department of Physics & Meteorology, Indian Institute of Technology, Kharagpur 721302, India

^*Corresponding author: palit@tifr.res.in
^†Present address: Homi Bhabha Centre for Science Education, TIFR, Mumbai 400088, India.

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Vol. 86, Iss. 3 — September 2012

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