First exploration of neutron shell structure below lead and beyond N=126

T.L. Tang, B.P. Kay, J.P. Schiffer, D.K. Sharp, L.P. Gaffney, S.J. Freeman, M.R. Mumpower, A. Arokiaraj, E.F. Baader, P .A. Butler, W.N. Catford, G. de Angelis, F. Flavigny, M.D. Gott, E.T. Gregor, J. Konki, M. Labiche, I.H. Lazarus, P.T. MacGregor, I. MartelR.D. Page, Zs. Podolyák, O. Poleshchuk, R. Raabe, F. Recchia, J.F. Smith, S.V. Szwec, J. Yang

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Abstract

The nuclei below lead but with more than 126 neutrons are crucial to an understanding of the astrophysical r process in producing nuclei heavier than A similar to 190. Despite their importance, the structure and properties of these nuclei remain experimentally untested as they are difficult to produce in nuclear reactions with stable beams. In a first exploration of the shell structure of this region, neutron excitations in Hg-207 have been probed using the neutron-adding (d,p) reaction in inverse kinematics. The radioactive beam of Hg-206 was delivered to the new ISOLDE Solenoidal Spectrometer at an energy above the Coulomb barrier. The spectroscopy of Hg-207 marks a first step in improving our understanding of the relevant structural properties of nuclei involved in a key part of the path of the r process.
Original languageEnglish
Article number062502
Number of pages7
JournalPhysical Review Letters
Volume124
Issue number6
DOIs
Publication statusPublished - 13 Feb 2020

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Keywords

  • R-process
  • Elements

Cite this

Tang, T. L., Kay, B. P., Schiffer, J. P., Sharp, D. K., Gaffney, L. P., Freeman, S. J., Mumpower, M. R., Arokiaraj, A., Baader, E. F., Butler, P. . A., Catford, W. N., de Angelis, G., Flavigny, F., Gott, M. D., Gregor, E. T., Konki, J., Labiche, M., Lazarus, I. H., MacGregor, P. T., ... Yang, J. (2020). First exploration of neutron shell structure below lead and beyond N=126. Physical Review Letters, 124(6), [062502]. https://doi.org/10.1103/PhysRevLett.124.062502