Precision masses for studies of the astrophysical r process
Abstract
Half of the elements heavier than iron (Z > 26) are thought to be created through the astrophysical r process, whereby nuclides are produced via a rapid series of nuclear reactions that are postulated to occur in high temperature and neutron density environments such as supernovae or merging neutron stars. The nucleosynthetic path that describes the sequence of reactions through the chart of nuclides strongly depends on the neutron-separation energies of the nuclei. Until recently, however, almost all of these neutron-rich nuclei were not within reach of accelerator facilities, and therefore simulations of the r process had to rely on mass models for input into the calculations. Now, with the advent of facilities such as CARIBU at Argonne National Laboratory, the masses of many nuclides along the r-process path can be determined precisely with Penning trap mass spectrometers coupled to these facilities. More than 70 nuclides have been measured with the Canadian Penning Trap mass spectrometer alone in the past year, which overlap and complement results from other Penning trap mass spectrometers, and first calculations with these new masses suggest the timescale of the r process through the tin isotopes is delayed much more strongly than mass models would suggest.
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science - Office of Nuclear Physics
- OSTI Identifier:
- 1396300
- DOE Contract Number:
- AC02-06CH11357
- Resource Type:
- Journal Article
- Journal Name:
- International Journal of Mass Spectrometry
- Additional Journal Information:
- Journal Volume: 349-350; Journal ID: ISSN 1387-3806
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Clark, Jason, and Savard, Guy. Precision masses for studies of the astrophysical r process. United States: N. p., 2013.
Web. doi:10.1016/j.ijms.2013.05.021.
Clark, Jason, & Savard, Guy. Precision masses for studies of the astrophysical r process. United States. https://doi.org/10.1016/j.ijms.2013.05.021
Clark, Jason, and Savard, Guy. 2013.
"Precision masses for studies of the astrophysical r process". United States. https://doi.org/10.1016/j.ijms.2013.05.021.
@article{osti_1396300,
title = {Precision masses for studies of the astrophysical r process},
author = {Clark, Jason and Savard, Guy},
abstractNote = {Half of the elements heavier than iron (Z > 26) are thought to be created through the astrophysical r process, whereby nuclides are produced via a rapid series of nuclear reactions that are postulated to occur in high temperature and neutron density environments such as supernovae or merging neutron stars. The nucleosynthetic path that describes the sequence of reactions through the chart of nuclides strongly depends on the neutron-separation energies of the nuclei. Until recently, however, almost all of these neutron-rich nuclei were not within reach of accelerator facilities, and therefore simulations of the r process had to rely on mass models for input into the calculations. Now, with the advent of facilities such as CARIBU at Argonne National Laboratory, the masses of many nuclides along the r-process path can be determined precisely with Penning trap mass spectrometers coupled to these facilities. More than 70 nuclides have been measured with the Canadian Penning Trap mass spectrometer alone in the past year, which overlap and complement results from other Penning trap mass spectrometers, and first calculations with these new masses suggest the timescale of the r process through the tin isotopes is delayed much more strongly than mass models would suggest.},
doi = {10.1016/j.ijms.2013.05.021},
url = {https://www.osti.gov/biblio/1396300},
journal = {International Journal of Mass Spectrometry},
issn = {1387-3806},
number = ,
volume = 349-350,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 2013},
month = {Sun Sep 01 00:00:00 EDT 2013}
}