Structure of positive parity states in 139Pm

S. S. Tiwary, H. P. Sharma, S. Chakraborty, C. Majumder, A. K. Gupta, Swati Modi, P. Arumugam, P. Banerjee, S. Ganguly, K. Rojeeta Devi, Neelam, S. Kumar, S. K. Chamoli, A. Sharma, V. V. Jyothi, Mayank, A. Kumar, S. S. Bhattacharjee, Indu Bala, S. MuralitharR. P. Singh

Research output: Contribution to journalArticlepeer-review


The excited states of 139Pm is investigated via 127I(16O, 4n)139Pm reaction at 84 MeV beam energy. The spin and parity of several states have been determined from the results of angular correlation (R DCO ) and linear polarization asymmetry (Δasym) measurements. The features of four positive parity bands have been determined. A band above state at 1951 keV comprised of strong magnetic dipole transitions has been established and a three-quasi-protons configuration is suggested on the basis of systematic of neighbouring nuclei. Additionally, a new band above state at 228 keV is observed. The states are compared with the modified particle rotor model calculations which indicated πg 7/2 configuration for this band.

Original languageEnglish
Article number095304
JournalPhysica Scripta
Issue number9
StatePublished - Sep 2020
Externally publishedYes

Bibliographical note

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© 2020 IOP Publishing Ltd.


  • Collective models
  • Nuclear structure
  • collective and non-collective energy levels
  • particle rotor model
  • spin and parity assignments
  • transitions and level energies


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