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29 March 2024
 
  » arxiv » astro-ph/0608582

 Article overview


R-process Experimental Campaign at the National Superconducting Cyclotron Laboratory
J. Pereira ; S. Hennrich ; M. Quinn ; A. Aprahamian ; O. Arndt ; A. Becerril ; T. Elliot ; A. Estrade ; D. Galaviz ; L. Kern ; R. Kessler ; K.-L. Kratz ; G. Lorusso ; P. Mantica ; M. Matos ; F. Montes ; B. Pfeiffer ; H. Schatz ; F. Schertz ; E. Smith ; W. Walters ; A. Woehr ;
Date 27 Aug 2006
AbstractA JINA/VISTARS r-process campaign was completed at the A1900 Fragment Separator of the National Superconducting Cyclotron Laboratory in the fall of 2005. The purpose of the campaign was the measurement of the beta-decay half-lives and beta-delayed neutron-emission probabilities of different unknown neutron-rich nuclei participating in the r-process. From these observables it will be possible to extract information about the region between the N=56 sub-shell closure at the sudden onset of deformation at N=60 in the A=100 region, and the potential new shell structures around the possible local, spherical double sub-shell closure at Z=40, N=70, which may help clarify the origin of the calculated r-process abundance deficiencies around A=110. Moreover, the region of the chart of nuclides investigated in the campaign included some important r-process waiting-point nuclei, whose beta-decay properties are crucial for understanding the r-process abundance pattern. Details of this campaign will be presented, emphasizing the experimental challenges that had to be faced.
Source arXiv, astro-ph/0608582
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