Measurement of electric quadrupole moment in neutron rich $$^{131,132}$$ 131 , 132 I
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Regular Article - Experimental Physics
Measurement of electric quadrupole moment in neutron rich 131,132 I S. S. Alam1,2 , D. Banerjee2,3 , T. Bhattacharjee1,2,a , P. Blaha4 , D. Kumar1,2 , A. Saha1,7 , M. Saha Sarkar5 , S. Sarkar6 , S. K. Das3 1
Variable Energy Cyclotron Centre, Kolkata 700 064, India Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400 094, India 3 RCD-BARC, Variable Energy Cyclotron Centre, Kolkata 700 064, India 4 Institute of Materials Chemistry, Vienna University of Technology, Wien 1060, Austria 5 Saha Institute of Nuclear Physics, Kolkata 700 064, India 6 Indian Institute of Engineering Science and Technology, Shibpur, West Bengal 711 103, India 7 Present Address: ICFAI University, Agartala, Tripura 799210, India
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Received: 12 May 2020 / Accepted: 13 October 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Communicated by Wolfram Korten
Abstract The quadrupole moments of the excited levels 132 I in neutron rich iodine isotopes, viz., 131 I (5/2+ 1 ) and + (31 ), have been measured with LaBr3 (Ce) detectors using Time Differential Perturbed Angular Correlation (TDPAC) spectroscopy. The excited levels were populated from β − decay of the radiochemically separated tellurium (Te) fission products produced in nat U(4 He,f) reaction at Eα (lab) = 40 MeV from K-130 cyclotron at VECC, Kolkata. The active tellurium fission products were radiochemically doped in metallic tellurium matrix to provide the necessary Electric Field Gradient (EFG) required for TDPAC measurement. 131 I The values of quadrupole moments for the 5/2+ 1 level of + 132 I were determined to be (−)0.30(1) eb and 31 level of and (−)0.25(2) eb, respectively. The present measurement provides the first experimental determination on the electric 131 I. quadrupole moment of 5/2+ 1 level of
1 Introduction The measurement of electric quadrupole moment is important to estimate the deviation of the nuclear charge distribution from sphericity [1,2]. It is also a sensitive probe to indicate the evolution of shell structure. Thus, such measurements in neutron rich nuclei below doubly closed 132 Sn are of substantial importance to probe the prevalence of expected spherical character as one approaches the N = 82 shell closure in this exotic domain [3–5]. However, the availabilS. K. Das: Retired. a e-mail:
[email protected] (corresponding author)
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ity of experimental data on electric quadrupole moments (EQM) in this mass region are inadequate. Apart from a few, most of the existing results are from measurements done during early 60s to late 80s [6]. So, it is important to perform more measurements on electric quadrupole moment to enrich the understanding of the evolution of shell structure around 132 Sn. In case of iodine nuclei, the systematic change of mea+ sured EQM for the 5/2+ 1 and 7/21 levels were studied in 1964 [7]. It was found by the authors of Ref. [7] that a linear extrapolation of the measured values to the closed neutron shell at N = 82 predicted
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