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High-spin states of \(^{204}\)At: isomeric states and shears band structure

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Abstract

High-spin states of neutron-deficient trans-lead nucleus \(^{204}\hbox {At}\) were populated up to \(\sim 8\,\mathrm{MeV}\) excitation through the \(^{12}\hbox {C} + ^{197}\hbox {Au}\) fusion evaporation reaction. Decay of the associated levels through prompt and delayed \(\gamma \)-ray emissions were studied to evaluate the underlying nuclear structure. The level scheme, which was partly known, was extended further. An isomeric \(16^+\) level with observed mean lifetime \(\tau =52 \pm 5\, \mathrm{ns}\), was established from our measurements. Attempts were made to interpret the excited states based on multi quasiparticle and hole structures involving \(2f_{5/2}\), \(1h_{9/2}\), and \(1i_{13/2}\) shell model states, along with moderate core excitation. Magnetic dipole band structure over the spin parity range: \(16^+\)–\(23^+\) was confirmed and evaluated in more detail, including the missing cross-over E2 transitions. Band-crossing along the shears band was observed and compared with the evidence of similar phenomena in the neighbouring \(^{202}\hbox {Bi}\), \(^{205}\hbox {Rn}\) isotones and the \(^{203}\hbox {At}\) isotope. Based on comparison of the measured B(M1)/B(E2) values for transitions along the band with the semiclassical model based estimates, the shears band of \(^{204}\hbox {At}\) was established along with the level scheme.

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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Associated data were submitted to the National Nuclear Data Center (NNDC) for evaluation].

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Acknowledgements

Authors would like to express their gratitude to the staff of the BARC-TIFR Pelletron Accelerator facility for smooth running of the machine during the experiment. Special thanks go to the members of the INGA collaboration for setting up the Clover Detector Array. We are grateful to S. Rajbanshi and Sajad Ali for their vauable suggestions on the theoretical estimates. We acknowledge the financial support for the project by the Department of Atomic Energy, Government of India, under Grant no. 12-R & D-SIN-5.02-0102.

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Author notes

  1. S. K. Dey

    Present address: KEK, Tsukuba, Japan

Authors and Affiliations

  1. Department of Physics, Raiganj Surendranath Mahavidyalaya, Raiganj, West Bengal, 733134, India

    D. Kanjilal

  2. Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, I/AF Bidhan Nagar, Kolkata, 700064, India

    S. K. Dey, M. Das, C. C. Dey & S. Saha

  3. Tata Institute of Fundamental Research, Mumbai, 400005, India

    R. Palit, S. Saha & J. Sethi

  4. Mody University of Science and Technology, Sikar, Rajasthan, 332311, India

    S. Ray

  5. Indian Institute of Engineering Science and Technology, Shibpur, Howrah, 711103, India

    A. Bisoi

  6. Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India

    S. Nag

  7. TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada

    S. S. Bhattacharjee

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  1. D. Kanjilal
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Correspondence to S. Saha.

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Communicated by W. Korten.

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Kanjilal, D., Dey, S.K., Bhattacharjee, S.S. et al. High-spin states of \(^{204}\)At: isomeric states and shears band structure. Eur. Phys. J. A 58, 159 (2022). https://doi.org/10.1140/epja/s10050-022-00809-4

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