Coexisting single-particle excitations and octupole correlations in the transitional nucleus $^{217}\mathrm{Ra}$

Coexisting single-particle excitations and octupole correlations in the transitional nucleus ${}^{217}{Ra}$

Madhu, A. Y. Deo, Khamosh Yadav, Dhananjaya Sahoo, Y. Y. Wang, Y. K. Wang, J. Meng, Saket Suman, S. K. Tandel, A. Sharma, I. Ahmed, K. Katre, K. Rojeeta Devi, S. Dutt, S. Kumar, Yashraj, S. Muralithar, and R. P. Singh

Phys. Rev. C 108, 014309 – Published 6 July 2023

Abstract

The level structure of the transitional nucleus ${}^{217}{Ra}$ has been extended with the addition of around 20 new transitions. The discrepancies between the placements of several transitions reported in the earlier studies are resolved. The newly established negative-parity sequence at low excitation energies hints at the expected parity-doublet structures in this nucleus. The properties of the observed simplex bands are compared with that of similar bands in neighboring nuclei. Since the presence of parity-doublet structures reflects octupole correlations, theoretical calculations using reflection-asymmetric triaxial particle rotor model (RAT-PRM) have been performed. A comparison of the observed features of the simplex bands with the predictions of the RAT-PRM calculations suggests that ${}^{217}{Ra}$ exhibits an intermediate behavior between the extremes of spherical and octupole-deformed nuclei. The termination of the simplex bands at intermediate energies and the structures lying above reflect the dominance of the single-particle excitations at higher excitation energies.

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Received 3 April 2023
Revised 17 May 2023
Accepted 27 June 2023

DOI:https://doi.org/10.1103/PhysRevC.108.014309

Physics Subject Headings (PhySH)

Collective levels Electromagnetic transitions Fusion evaporation reactions High spin states Nuclear spin & parity Nuclear structure & decays

190 ≤ A ≤ 219

Radiation detectors

Nuclear Physics

Authors & Affiliations

Madhu¹, A. Y. Deo ^1,*, Khamosh Yadav ¹, Dhananjaya Sahoo ¹, Y. Y. Wang², Y. K. Wang³, J. Meng ^3,4, Saket Suman ⁵, S. K. Tandel ⁵, A. Sharma⁶, I. Ahmed ⁷, K. Katre⁷, K. Rojeeta Devi⁷, S. Dutt⁷, S. Kumar⁷, Yashraj⁷, S. Muralithar⁷, and R. P. Singh ⁷

¹Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India
²Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China
³State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
⁴Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
⁵School of Physical Sciences, UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Mumbai 400098, India
⁶Department of Physics, Himachal Pradesh University, Shimla 171005, India
⁷Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India

^*ajay.deo@ph.iitr.ac.in

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Vol. 108, Iss. 1 — July 2023

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Physical Review C

covering nuclear physics

Coexisting single-particle excitations and octupole correlations in the transitional nucleus ${}^{217}{Ra}$

Madhu, A. Y. Deo, Khamosh Yadav, Dhananjaya Sahoo, Y. Y. Wang, Y. K. Wang, J. Meng, Saket Suman, S. K. Tandel, A. Sharma, I. Ahmed, K. Katre, K. Rojeeta Devi, S. Dutt, S. Kumar, Yashraj, S. Muralithar, and R. P. Singh

Phys. Rev. C 108, 014309 – Published 6 July 2023

Abstract

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Physical Review C

covering nuclear physics

Coexisting single-particle excitations and octupole correlations in the transitional nucleus Ra217

Madhu, A. Y. Deo, Khamosh Yadav, Dhananjaya Sahoo, Y. Y. Wang, Y. K. Wang, J. Meng, Saket Suman, S. K. Tandel, A. Sharma, I. Ahmed, K. Katre, K. Rojeeta Devi, S. Dutt, S. Kumar, Yashraj, S. Muralithar, and R. P. Singh

Phys. Rev. C 108, 014309 – Published 6 July 2023

Abstract

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Coexisting single-particle excitations and octupole correlations in the transitional nucleus ${}^{217}{Ra}$