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  • Letter
  • Open Access

πh11/2 rotational structure in the neutron-deficient rare-earth nucleus Pm131

C. M. Sullivan1,*, E. S. Paul1, M. A. Riley2, J. Simpson3, D. T. Joss1, M. A. M. Al-Aqeel1, B. Alayed4, H. Badran5, A. J. Boston1 et al.

A. D. Briscoe1, B. Cederwall6, C. Delafosse5, A. Ertoprak6,†, Z. Favier7,‡, L. S. Ferreira8, U. Forsberg5,§, W. Gins5, P. T. Greenlees5, J. Heery1,∥, J. Hilton1, R. Julin5, S. Kalantan1, M. Leino5, M. C. Lewis1, M. Luoma5, B. F. Lv9, E. Maglione8, A. McCarter1,¶, S. Nathaniel1, J. Ojala5, R. D. Page1, J. Pakarinen5, P. Papadakis1,**, E. Parr1,††, J. Partanen5,‡‡, C. M. Petrache7,§§, P. Rahkila5, P. Ruotsalainen5, M. Sandzelius5, J. Sarén5, J. Smallcombe1,∥∥, J. Sorri10,¶¶, H. Tann1, J. Uusitalo5, L. Waring1, K. K. Zheng9, and G. L. Zimba5,a

  • *Contact author: cmsulli@liverpool.ac.uk
  • †Present address: Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, USA.
  • ‡Present address: Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
  • §Present address: Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom, and Department of Physics, Lund University, SE-22100 Lund, Sweden.
  • ∥Present address: School of Mathematics and Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
  • Present address: Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, 9747AA Groningen, The Netherlands.
  • **Present address: STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom.
  • ††Present address: UKAEA, Culham Campus, Abingdon, Oxfordshire OX14 3DB, United Kingdom.
  • ‡‡Deceased.
  • §§Present address: Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China, and Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
  • ∥∥Present address: Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan.
  • ¶¶Present address: Radiation and Nuclear Safety Authority in Finland (STUK), FI-01370 Vantaa, Finland.
  • aPresent address: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
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Phys. Rev. C 114, L021304 – Published 25 August, 2026

DOI: https://doi.org/10.1103/442b-1n6q

Abstract

High-spin states in the neutron-deficient nucleus Pm7061131 have been investigated using the Jurogam 3 γ-ray spectrometer. This is the lightest promethium isotope with known excited states. The proton intruder h11/2 rotational structure has been extended to both higher and lower spin, and its unfavored-signature partner identified. This rotational structure is established down to a presumed Iπ=5/2− bandhead of the πh11/2[532]5/2− Nilsson orbital, which is also expected to form the ground state of this deformed nucleus. Systematic comparisons are made with cranked shell-model calculations.

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References (42)

  1. S. Frauendorf, Beyond the unified model, Phys. Scr. 93, 043003 (2018).
  2. C. M. Petrache, P. M. Walker, S. Guo, Q. B. Chen, S. Frauendorf, Y. X. Liu, R. A. Wyss, D. Mengoni, Y. H. Qiang, A. Astier, E. Dupont, R. Li, B. F. Lv, K. K. Zheng, D. Bazzacco, A. Boso, A. Goasduff, F. Recchia, D. Testov, F. Galtarossa, et al., Diversity of shapes and rotations in the γ-soft Ba130 nucleus: First observation of a t-band in the A=130 mass region, Phys. Lett. B 795, 241 (2019).
  3. F. D. Becchetti and G. W. Greenlees, Nucleon-nucleus optical-model parameters, A>40,E<50MeV, Phys. Rev. 182, 1190 (1969).
  4. S. Åberg, P. B. Semmes, and W. Nazarewicz, Spherical proton emitters, Phys. Rev. C 56, 1762 (1997).
  5. E. Maglione, L. S. Ferreira, and R. J. Liotta, Proton emission from deformed nuclei, Phys. Rev. C 59, R589 (1999).
  6. C. N. Davids, P. J. Woods, D. Seweryniak, A. A. Sonzogni, J. C. Batchelder, C. R. Bingham, T. Davinson, D. J. Henderson, R. J. Irvine, G. L. Poli, J. Uusitalo, and W. B. Walters, Proton radioactivity from highly deformed nuclei, Phys. Rev. Lett. 80, 1849 (1998).
  7. A. A. Sonzogni, C. N. Davids, P. J. Woods, D. Seweryniak, M. P. Carpenter, J. J. Ressler, J. Schwartz, J. Uusitalo, and W. B. Walters, Fine structure in the decay of the highly deformed proton emitter Eu131, Phys. Rev. Lett. 83, 1116 (1999).
  8. D. Seweryniak, P. Woods, J. Ressler, C. Davids, A. Heinz, A. Sonzogni, J. Uusitalo, W. Walters, J. Caggiano, M. Carpenter, J. Cizewski, T. Davinson, K. Ding, N. Fotiades, U. Garg, R. Janssens, T. Khoo, F. Kondev, T. Lauritsen, C. Lister, et al., GAMMASPHERE + FMA: A journey beyond the proton drip-line, Nucl. Phys. A 682, 247 (2001).
  9. E. Maglione and L. S. Ferreira, Fine structure in proton emission from deformed Eu131, Phys. Rev. C 61, 047307 (2000).
  10. J. Pakarinen, J. Ojala, P. Ruotsalainen, H. Tann, H. Badran, T. Calverley, J. Hilton, T. Grahn, P. T. Greenlees, M. Hytönen, A. Illana, A. Kauppinen, M. Luoma, P. Papadakis, J. Partanen, K. Porras, M. Puskala, P. Rahkila, K. Ranttila, J. Sarén, et al., The JUROGAM 3 spectrometer, Eur. Phys. J. A 56, 149 (2020).
  11. P. T. Greenlees et al., Heavy element spectroscopy at JYFL, AIP Conf. Proc. 764, 237 (2005).
  12. G. Duchêne, F. A. Beck, P. J. Twin, G. de France, D. Curien, L. Han, C. W. Beausang, M. A. Bentley, P. J. Nolan, and J. Simpson, The clover: A new generation of composite Ge detectors, Nucl. Instrum. Methods Phys. Res. Sect. A 432, 90 (1999).
  13. C. W. Beausang, S. A. Forbes, P. Fallon, P. J. Nolan, P. J. Twin, J. N. Mo, J. C. Lisle, M. A. Bentley, J. Simpson, F. A. Beck, D. Curien, G. de France, G. Duchêne, and D. Popescu, Measurements on prototype Ge and BGO detectors for the Eurogam array, Nucl. Instrum. Methods Phys. Res. Sect. A 313, 37 (1992).
  14. I. H. Lazarus, D. E. Appelbe, P. A. Butler, P. J. Coleman-Smith, J. R. Cresswell, S. J. Freeman, R. D. Herzberg, I. Hibbert, D. T. Joss, S. C. Letts, R. D. Page, V. F. E. Pucknell, P. H. Regan, J. Sampson, J. Simpson, J. Thornhill, and R. Wadsworth, The GREAT triggerless total data readout method, IEEE Trans. Nucl. Sci. 48, 567 (2001).
  15. P. Rahkila, Grain-A Java data analysis system for total data readout, Nucl. Instrum. Methods Phys. Res. Sect. A 595, 637 (2008).
  16. D. C. Radford, ESCL8R and LEVIT8R: Software for interactive graphical analysis of HPGe coincidence data sets, Nucl. Instrum. Methods Phys. Res. Sect. A 361, 297 (1995).
  17. K. Lagergren (private communication).
  18. B. Crowell, M. P. Carpenter, R. G. Henry, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, and D. Nisius, Background subtraction for high-fold gamma-ray coincidence data, Nucl. Instrum. Methods Phys. Res. Sect. A 355, 575 (1995).
  19. K. S. Krane, R. M. Steffen, and R. M. Wheeler, Directional correlations of gamma radiations emitted from nuclear states oriented by nuclear reactions or cryogenic methods, At. Data Nucl. Data Tables, 11, 351 (1973).
  20. L. Peter Ekström and A. Nordlund, Gamma-gamma correlations with detector arrays, Nucl. Instrum. Methods Phys. Res. Sect. A 313, 421 (1992).
  21. P. M. Jones, L. Wei, F. A. Beck, P. A. Butler, T. Byrski, G. Duchêne, G. de France, F. Hannachi, G. D. Jones, and B. Kharraja, Calibration of the new composite “clover” detector as a Compton polarimeter for the EUROGAM array, Nucl. Instrum. Methods Phys. Res. Sect. A 362, 556 (1995).
  22. C. M. Parry, A. J. Boston, C. Chandler, A. Galindo-Uribarri, I. M. Hibbert, V. P. Janzen, D. T. Joss, S. M. Mullins, P. J. Nolan, E. S. Paul, P. H. Regan, S. M. Vincent, R. Wadsworth, D. Ward, and R. Wyss, Yrast structures in the neutron-deficient Pr6859127 and Pm7061131 nuclei, Phys. Rev. C 57, 2215 (1998).
  23. S. Cwiok, J. Dudek, W. Nazarewicz, J. Skalski, and T. Werner, Single-particle energies, wave functions, quadrupole moments and g-factors in an axially deformed Woods-Saxon potential with applications to the two-centre-type nuclear problems, Comput. Phys. Commun. 46, 379 (1987).
  24. P. Möller, R. Bengtsson, B. G. Carlsson, P. Olivius, T. Ichikawa, H. Sagawa, and A. Iwamoto, Axial and reflection asymmetry of the nuclear ground state, At. Data Nucl. Data Tables, 94, 758 (2008).
  25. P. Möller, A. J. Sierk, T. Ichikawa, and H. Sagawa, Nuclear ground-state masses and deformations: FRDM(2012), At. Data Nucl. Data Tables 109–110, 1 (2016).
  26. F. Donau and S. Frauendorf, Proceedings of Conference on High Angular Momentum Properties of Nuclei (Harwood, New York, 1982), Vol. 4, p. 143.
  27. R. Bengtsson and S. Frauendorf, An interpretation of backbending in terms of the crossing of the ground state band with an aligned two-quasiparticle band, Nucl. Phys. A 314, 27 (1979).
  28. R. Bengtsson, S. Frauendorf, and F. R. May, Quasiparticle levels in rotating rare earth nuclei: A cranked shell-model dictionary, At. Data Nucl. Data Tables 35, 15 (1986).
  29. W. Nazarewicz, J. Dudek, R. Bengtsson, T. Bengtsson, and I. Ragnarsson, Microscopic study of the high-spin behaviour in selected A≃80 nuclei, Nucl. Phys. A 435, 397 (1985).
  30. D. J. Hartley, W. Reviol, L. L. Riedinger, H. Q. Jin, B. H. Smith, N. Yoder, O. Zeidan, A. Galindo-Uribarri, D. G. Sarantites, D. R. LaFosse, J. N. Wilson, and S. M. Mullins, Yrast spectroscopy of Nd130 and evidence of a highly deformed band, Phys. Rev. C 63, 024316 (2001).
  31. S. M. Harris, Higher order corrections to the cranking model, Phys. Rev. 138, B509 (1965).
  32. S. W. Xu, Y. X. Xie, F. R. Xu, Z. K. Li, and X. D. Wang, First decay study of the new isotope Pm129 near the proton drip line, Eur. Phys. J. A 21, 75 (2004).
  33. R. Wadsworth, J. M. O'Donnell, D. L. Watson, P. J. Nolan, P. J. Bishop, D. J. Thornley, A. Kirwan, and D. J. G. Love, Lifetimes of low-lying levels in light rare earth nuclei around A=135, J. Phys. G: Nucl. Phys. 13, 205 (1987).
  34. A. Galindo-Uribarri, D. Ward, H. R. Andrews, G. C. Ball, D. C. Radford, V. P. Janzen, S. M. Mullins, J. C. Waddington, A. V. Afanasjev, and I. Ragnarsson, Lifetime measurements of strongly deformed rotational bands in Pm133, Phys. Rev. C 54, 1057 (1996).
  35. P. Möller, J. R. Nix, and K. L. Kratz, Nuclear properties for astrophysical and radioactive-ion-beam applications, At. Data Nucl. Data Tables 66, 131 (1997).
  36. P. Möller, M. R. Mumpower, T. Kawano, and W. D. Myers, Nuclear properties for astrophysical and radioactive-ion-beam applications (II), At. Data Nucl. Data Tables, 125, 1 (2019).
  37. A. Bohr and B. R. Mottelson, Nuclear Structure: Single-Particle Motion (World Scientific Publishing Company, Singapore, 1998), Vol. 1, p. 169.
  38. P. H. Regan, R. Wadsworth, J. R. Hughes, G. J. Gyapong, W. Gelletly, M. J. Godfrey, I. Jenkins, Y. J. He, S. M. Mullins, P. J. Nolan, J. Simpson, B. J. Varley, and D. L. Watson, Spectroscopy of the light rare-earth nuclei Pm133 and Sm133, Nucl. Phys. A 533, 476 (1991).
  39. W. Pei-Kun, Y. Guan-Jun, Z. Zhan-Jun, L. Sheng-Gang, W. Shu-Xian, L. Guang-Sheng, D. Zheng-Yu, Y. Chun-Xiang, P. Zhao-Hua, L. Xiang-An, W. Xiao-Guang, and P. Yun-Wei, High-spin states in the odd-proton nucleus Pm135, Chin. Phys. Lett. 18, 30 (2001).
  40. F. S. Babra, S. Jehangir, R. Palit, S. Biswas, B. Das, S. Rajbanshi, G. H. Bhat, J. A. Sheikh, B. Das, P. Dey, U. Garg, M. S. R. Laskar, C. Palshetkar, S. Saha, L. P. Singh, and P. Singh, Investigation of the alignment mechanism and loss of collectivity in Pm135, Phys. Rev. C 103, 014316 (2021).
  41. L. Goettig, W. Gelletly, C. Lister, R. Moscrop, and B. Varley, Decoupled bands in odd-A rare-earth nuclei below N = 82, Nucl. Phys. A 475, 569 (1987).
  42. P. J. Bishop et al., A study of nuclei in the mass 137 region of the light rare earths, Fizika (Zagreb) 19, 29 (1987).

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Phys. Rev. C 114, L021304– Published 25 August, 2026
  • Received 23 February 2026
  • Accepted 15 July 2026
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