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Cr61 as a doorway to the N=40 island of inversion

L. Lalanne1,2,3,*, M. Athanasakis-Kaklamanakis1,2, D. D. Dao3, Á. Koszorús1, Y. C. Liu4, R. Mancheva2,1, F. Nowacki3, J. Reilly5, C. Bernerd2 et al. (CERN, ISOLDE Collaboration, IS714)

C. Bernerd2, K. Chrysalidis2, T. E. Cocolios1, R. P. de Groote1, K. T. Flanagan5, R. F. Garcia Ruiz6, D. Hanstorp7, R. Heinke1, M. Heines1, P. Lassegues1, K. Mack5, B. A. Marsh2, A. McGlone5, K. M. Lynch5, G. Neyens1, B. van den Borne1, R. Van Duyse1, X. F. Yang4, and J. Wessolek5,2 (CERN, ISOLDE Collaboration, IS714)

  • *Contact author: louis.lalanne@iphc.cnrs.fr
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Phys. Rev. C 112, L031301 – Published 2 September, 2025

DOI: https://doi.org/10.1103/423q-cxfh

Abstract

This paper reports on the measurement of the ground-state spin and nuclear magnetic dipole moment of Cr61. The radioactive ion beam was produced at the CERN-ISOLDE facility and was probed using high-resolution resonance ionization laser spectroscopy with the collinear resonance ionization spectroscopy (CRIS) apparatus. The present ground-state spin measurement I=12, differing from the previously adopted I=(52), has significant consequences on the interpretation of existing beta decay data and nuclear structure in the region. The structure and shape of Cr61 is interpreted with state-of-the-art Large-Scale Shell-Model and Discrete NonOrthogonal Shell-Model calculations. From the measured magnetic dipole moment μ(61Cr)=+0.541(6)μN and the theoretical findings, its configuration is understood to be driven by two-particle–two-hole neutron excitations with an unpaired 1p1/2 neutron. This establishes the western border of the N=40 island of inversion, characterized by four-particle–four-hole neutron components. We discuss the shape evolution along the Cr isotopic chain as a second-order quantum phase transition at the entrance of the N=40 island of inversion.

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References (49)

  1. O. Sorlin and M.-G. Porquet, Prog. Part. Nucl. Phys. 61, 602 (2008).
  2. T. Otsuka, A. Gade, O. Sorlin, T. Suzuki, and Y. Utsuno, Rev. Mod. Phys. 92, 015002 (2020).
  3. F. Nowacki, A. Obertelli, and A. Poves, Prog. Part. Nucl. Phys. 120, 103866 (2021).
  4. K. Heyde and J. L. Wood, Rev. Mod. Phys. 83, 1467 (2011).
  5. E. Caurier, F. Nowacki, and A. Poves, Phys. Rev. C 90, 014302 (2014).
  6. S. M. Lenzi, F. Nowacki, A. Poves, and K. Sieja, Phys. Rev. C 82, 054301 (2010).
  7. D. D. Dao and F. Nowacki, Phys. Rev. C 105, 054314 (2022).
  8. J. Ljungvall et al., Phys. Rev. C 81, 061301(R) (2010).
  9. O. Sorlin et al., Eur. Phys. J. A 16, 55 (2003).
  10. T. Baugher et al., Phys. Rev. C 86, 011305(R) (2012).
  11. M. Mougeot et al., Phys. Rev. Lett. 120, 232501 (2018).
  12. A. Gade et al., Phys. Rev. C 103, 014314 (2021).
  13. C. Santamaria et al., Phys. Rev. Lett. 115, 192501 (2015).
  14. R. Silwal et al., Phys. Lett. B 833, 137288 (2022).
  15. H. L. Crawford et al., Phys. Rev. Lett. 110, 242701 (2013).
  16. A. Gade et al., Nat. Phys. 21, 37 (2025).
  17. F. Ameil et al., Eur. Phys. J. A 1, 275 (1998).
  18. O. Sorlin et al., Nucl. Phys. A 660, 3 (1999).
  19. L. Gaudefroy et al., Eur. Phys. J. A 23, 41 (2005).
  20. H. L. Crawford et al., Phys. Rev. C 79, 054320 (2009).
  21. S. Suchyta et al., Phys. Rev. C 89, 034317 (2014).
  22. R. Catherall et al., J. Phys. G: Nucl. Part. Phys. 44, 094002 (2017)
  23. B. A. Marsh et al., Hyperfine Interact. 196, 129 (2010).
  24. E. Mané et al., Eur. Phys. J. A 42, 503 (2009).
  25. T. E. Cocolios et al., Nucl. Instrum. Methods Phys. Res. B 376, 284 (2016).
  26. M. Athanasakis-Kaklamanakis et al., Nucl. Instrum. Methods Phys. Res. B 541, 86 (2023).
  27. U. Becker et al., J. Phys. B: Atom. Mol. Phys. 11, 2435 (1978).
  28. H. Bucka et al., Phys. Rev. 144, 96 (1966).
  29. T. Reinhardt et al., Z. Phys. D 34, 87 (1995).
  30. J. Sugar and C. Corliss, J. Phys. Chem. Ref. Data 6, 317 (1977).
  31. X. F. Yang et al., Prog. Part. Nucl. Phys. 129, 104005 (2023).
  32. S. Lunardi et al., Phys. Rev. C 76, 034303 (2007)
  33. M. Block et al., Phys. Rev. Lett. 100, 132501 (2008)
  34. W. Gins et al., Comput. Phys. Commun. 222, 286 (2018).
  35. A. Jarosz et al., J. Phys. B: At. Mol. Opt. Phys. 40, 2785 (2007).
  36. W. J. Childs et al., Phys. Rev. 132, 2128 (1963).
  37. J. R. Persson, At. Data Nucl. Data Tables 154, 101589 (2023).
  38. N. J. Stone, Atomic Data and Nuclear Data Tables 90, 75 (2005).
  39. F. Alder and K. Halbach, Helv. Phys. Acta 26, 426 (1953).
  40. National Nuclear Data Center, information extracted from the NuDat database, https://www.nndc.bnl.gov/nudat/.
  41. C. Babcock et al., Phys. Lett. B 750, 176 (2015).
  42. J. J. Valiente-Dobón et al., Phys. Rev. C 78, 024302 (2008).
  43. J. C. Hardy et al., Phys. Lett. B 71, 307 (1977).
  44. F. Nowacki (private communication).
  45. A. Gade et al., Phys. Rev. Lett. 112, 112503 (2014).
  46. M. Cortés et al., Phys. Lett. B 800, 135071 (2020).
  47. T. Miyagi, X. Cao, R. Seutin, S. Bacca, R.F. Ruiz, K. Hebeler, J.D. Holt, and A. Schwenk, Phys. Rev. Lett. 132, 232503 (2024).
  48. P. Cejnar, J. Jolie, and R. F. Casten, Rev. Mod. Phys. 82, 2155 (2010).
  49. T. Togashi, Y. Tsunoda, T. Otsuka, and N. Shimizu, Phys. Rev. Lett. 117, 172502 (2016).

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Phys. Rev. C 112, L031301– Published 2 September, 2025
  • Received 18 October 2024
  • Revised 18 March 2025
  • Accepted 7 July 2025
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