Study of Positive Parity Band Structures in Doubly Odd ¹²⁰I Nucleus

¹ Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005 India.
² Department of Physics: Panjab University Chandigarh, Chandigarh, Chandigarh, 160014 India.
³ Department of Physics, Islamic University of Science and Technology, Jammu and Kashmir, 192 122, India.
⁴ Department of Physics, S.P. College, Srinagar, Jammu and Kashmir, 190001, India.
⁵ Department of Physics, University of Kashmir, Srinagar - 190006, India.
⁶ Inter-University Accelerator Centre, New Delhi - 110067, India.
⁷ Indian Institute of Technology, Khargpur - 110067 and
⁸ Department of Nuclear and Atomic Physics, TIFR, Mumbai - 400005, India.

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Published online: 5 March 2026

Abstract

The band structures of the odd-odd nucleus ¹²⁰I were studied experimentally using the ¹¹B + ¹¹²Cd → ¹²⁰I + 3n fusion-evaporation reaction at a beam energy of 50 MeV at the TIFR Pelletron facility. The g- g coincidence events were collected with the high-efficiency, Indian National Gamma Array (INGA), consisting of sixteen Compton-suppressed clover detectors. The present dataset enabled a significant extension of the previously known positive parity level of ¹²⁰I, with levels established up to ~10 MeV excitation energy. Four new γ-ray transitions were identified and placed in the level scheme and a new rotational band is also reported. Spin–parity assignments were made using Directional Correlation (DCO) ratios and polarisation (IPDCO) measurements, allowing determination of transition multipolarities In the present investigation, several positive- and negative-parity band structures are revised and on compare with the neighbouring nuclei for better understading of the positive parity state is observed in ¹²⁰I.