scholarly journals Cross sections and fragment distributions from neutrino-induced fission on r-process nuclei

2005 ◽  
Vol 616 (1-2) ◽  
pp. 48-58 ◽  
Author(s):  
A. Kelić ◽  
N. Zinner ◽  
E. Kolbe ◽  
K. Langanke ◽  
K.-H. Schmidt
Keyword(s):  
Cross Sections ◽  
Induced Fission ◽  
R Process

scholarly journals Characterization of the Medley setup for measurements of neutron-induced fission cross sections at the GANIL-NFS facility

2017 ◽  
Vol 146 ◽  
pp. 03026 ◽  
Author(s):  
Diego Tarrío ◽  
Alexander V. Prokofiev ◽  
Cecilia Gustavsson ◽  
Kaj Jansson ◽  
Erik Andersson-Sundén ◽  
...  
Keyword(s):  
Cross Sections ◽  
Induced Fission

scholarly journals Neutron capture data for unstable nuclei – Astrophysical quests and experimental challenges

2019 ◽  
Vol 23 ◽  
pp. 1
Author(s):  
F. Käppeler
Keyword(s):  
Cross Sections ◽  
Reaction Path ◽  
Chemical Elements ◽  
Neutron Sources ◽  
Unstable Nuclei ◽  
Quantitative Studies ◽  
Branching Points ◽  
Supernova Explosions ◽  
R Process ◽  
Pulsed Neutron

The abundances of the chemical elements heavier than iron can be attributed in about equal parts to the r and s processes, which are taking place in supernova explosions and during the He and C burning phases of stellar evolution, respectively. So far, quantitative studies of the r-process are out of reach, because it involves reactions on extremely short-lived neutron-rich nuclei. On the contrary, the situation for the s-process is far advanced, thanks to a comprehensive database of experimental (n,γ) cross sections for most isotopes along the reaction path from 12C to the Pb/Bi region. For the stable isotopes last gaps in the data are presently closed, but further studies are clearly needed to reach the required accuracy and to resolve remaining discrepancies. The quest for cross sections of unstable isotopes remains a persisting challenge though. In particular, nuclei which act as branching points are of prime interest, because they provide key information on the deep stellar interior. While the activation method is limited to a few exceptional branch-point nuclei, successful measurements via the time-of- flight technique are depending on intense pulsed neutron sources and elaborate methods for sample production. Current developments in Europe are providing promising perspectives in both areas.

High-energy Neutron-induced Fission Cross Sections of Natural Lead and Bismuth-209

2011 ◽  
Vol 59 (2(3)) ◽  
pp. 1904-1907
Author(s):  
D. Tarrio ◽  
L. Tassan-Got ◽  
L. Audouin ◽  
B. Berthier ◽  
L. Ferrant ◽  
...  
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
High Energy Neutron ◽  
Energy Neutron ◽  
Induced Fission

scholarly journals Development of an experimental set-up for the measurement of neutron-induced fission and capture cross sections of highly radioactive fissile nuclei

2014 ◽  
Vol 69 ◽  
pp. 00005 ◽  
Author(s):  
Iulia Companis ◽  
Ludovic Mathieu ◽  
Mourad Aïche ◽  
Peter Schillebeeckx ◽  
Jan Heyse ◽  
...  
Keyword(s):  
Cross Sections ◽  
Capture Cross ◽  
Induced Fission ◽  
Set Up ◽  
Capture Cross Sections

scholarly journals Fusion-induced fission measurements with the MUSIC active target detector

2020 ◽  
Vol 242 ◽  
pp. 01005
Author(s):  
Sergio Almaraz-Calderon ◽  
K. Ernst Rehm ◽  
Benjamin W. Asher ◽  
Melina L. Avila ◽  
Kalle Auranen ◽  
...  
Keyword(s):  
Cross Sections ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Capture Process ◽  
Single Beam ◽  
Active Target ◽  
Binary Neutron Star ◽  
Theoretical Predictions ◽  
Multi Wavelength ◽  
R Process

The rapid neutron capture process (r-process) is believed to be responsible for about half of the production of the elements heavier than iron and it may also contribute to abundances of some lighter nuclides. Great excitement was recently generated by evidence for r-process nucleosynthesis in binary neutron star mergers via multi-wavelength observations of kilonova emission and gravitational waves. In order to interpret the observations and validate theoretical predictions, an understanding of the fission process, in particular of the evolution of fission barrier heights, is needed. An experimental study of fusioninduced fission cross sections using active-target detectors is a promising idea since the fission excitation function can be studied with a single beam energy. The Multi-Sampling Ionization Chamber (MUSIC) is an active-target detector in which a gas serves as both, counting gas and target nuclei. A proof-of principle experiment to explore the ability to identify fission events with MUSIC was recently performed at Argonne National Laboratory. In this work, ideas, results and perspectives will be discussed.

scholarly journals Neutron-induced fission cross sections ofPu242from 0.3 MeV to 3 MeV

2015 ◽  
Vol 92 (4) ◽  
Author(s):  
P. Salvador-Castiñeira ◽  
T. Bryś ◽  
R. Eykens ◽  
F.-J. Hambsch ◽  
A. Göök ◽  
...  
Keyword(s):  
Cross Sections ◽  
Induced Fission

MEASUREMENT OF FISSION FRAGMENT ANISOTROPIES FOR PROTON-INDUCED FISSION OF TWO PRE-ACTINIDE NUCLEI AT SEVERAL ENERGIES

2007 ◽  
Vol 22 (05) ◽  
pp. 1027-1037 ◽  
Author(s):  
S. SOHEYLI ◽  
H. NOSHAD ◽  
M. LAMEHI-RACHTI
Keyword(s):  
Angular Distribution ◽  
Statistical Model ◽  
Cross Sections ◽  
Fission Fragment ◽  
Anomalous Behavior ◽  
Surface Barrier ◽  
Mass Asymmetry ◽  
Fission Fragments ◽  
Induced Fission ◽  
Barrier Detectors

The angular distribution of fission fragments has been measured for proton-induced fission of 197 Au and 209 Bi nuclei at several energies between 25 and 30 MeV using surface-barrier detectors. The measured anisotropies are found to be in agreement with the predictions of the standard saddle-point statistical model. The measured anisotropies for neither of the nuclei show any anomalous behavior as a function of both energy and entrance channel mass asymmetry. The fission cross sections of 197 Au and 209 Bi nuclei were also measured and compared with that of the previous works.

New approximations to the energy dependences of the total cross sections for the proton-induced fission of 197Au, 203Tl, natPb, and 209Bi nuclei

2011 ◽  
Vol 74 (1) ◽  
pp. 115-121 ◽  
Author(s):  
L. A. Vaishnene ◽  
V. G. Vovchenko ◽  
Yu. A. Gavrikov ◽  
V. I. Murzin ◽  
V. V. Polyakov ◽  
...  
Keyword(s):  
Cross Sections ◽  
Total Cross Sections ◽  
Induced Fission
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