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First Exploration of Neutron Shell Structure Below Lead and Beyond boldsymbol{N=126}

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arxiv 2001.00976 v1 pith:5RFJM3KS submitted 2020-01-03 nucl-ex nucl-th

First Exploration of Neutron Shell Structure Below Lead and Beyond boldsymbol{N=126}

classification nucl-ex nucl-th
keywords nucleifirststructurebelowexplorationleadneutronprocess
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $A\sim190$. 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 $^{207}$Hg have been probed using the neutron-adding ($d$,$p$) reaction in inverse kinematics. The radioactive beam of $^{206}$Hg was delivered to the new ISOLDE Solenoidal Spectrometer at an energy above the Coulomb barrier. The spectroscopy of $^{207}$Hg 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.

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