학술논문
First Exploration of Neutron Shell Structure Below Lead and Beyond $\boldsymbol{N=126}$
Document Type
Working Paper
Author
Tang, T. L.; Kay, B. P.; Hoffman, C. R.; 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.; Lazurus, I. H.; MacGregor, P. T.; Martel, I.; Page, R. D.; Podolyák, Zs.; Poleshchuk, O.; Raabe, R.; Recchia, F.; Smith, J. F.; Szwec, S. V.; Yang, J.
Source
Subject
Language
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 $A\sim190$. 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.
Comment: 6 pages, 5 figures
Comment: 6 pages, 5 figures