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High spin states; nuclear structure; gamma-ray spectroscopy; ¹³⁹Pr energy levels

The high spin states in N=80 ¹³⁹Pr have been investigated by in-beam γ-spectroscopic techniques following the reaction ¹³⁰Te (¹⁴N, 5n) reaction at E=75 MeV, using a gamma detector array, consisting of seven 23% compton-suppressed high purity germanium detectors and a multiplicity ball of fourteen bismuth germanate elements. Based on γ-γ coincidence data, the level scheme of ¹³⁹Pr has been considerably extended up to 7.2 MeV excitation. Tentative spin-parity assignments are done for the newly proposed levels on the basis of the DCO ratios corresponding to strong gates and the available information from the earlier light ion experiments.

S Chanda¹ Sarmishtha Bhattacharyya² Tumpa Bhattacharjee² SS Ghugre³ Swapan Kumar Basu² S Muralithar⁴ RP Singh⁴ B Mukherjee⁴ RK Bhowmik⁴ SN Ray⁵

1. Fakir Chand College, Diamond Harbour, West Bengal
2. Variable Energy Energy Cyclotron Centre, Kolkata - 700 064, India
3. Inter University Consortium for DAE Facilities, Kolkata - 700 091, India
4. Nuclear Science Centre, New Delhi - 110 067, India
5. Physics Department, Viswabharati University, Santiniketan, West Bengal

Published

July 2001