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Precise measurement of the thermal and stellar $^{54}$Fe($n, \gamma$)$^{55}$Fe cross sections via AMS

Accelerator mass spectrometry (AMS) represents a complementary approach for precise measurements of neutron capture cross sections, e.g., for nuclear astrophysics. This technique, completely independent of previous experimental methods, was applied for the measurement of the Fe54(n,γ)Fe55 reaction....

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Autores principales: Wallner, Anton, Belgya, Tamas, Buczak, Kathrin, Coquard, Laurent, Bichler, Max, Dillmann, Iris, Golser, Robin, Käppeler, Franz, Karakas, Amanda, Kutschera, Walter, Lederer, Claudia, Mengoni, Alberto, Pignatari, Marco, Priller, Alfred, Reifarth, Rene, Steier, Peter, Szentmiklosi, Laszlo
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevC.96.025808
http://cds.cern.ch/record/2236315
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author Wallner, Anton
Belgya, Tamas
Buczak, Kathrin
Coquard, Laurent
Bichler, Max
Dillmann, Iris
Golser, Robin
Käppeler, Franz
Karakas, Amanda
Kutschera, Walter
Lederer, Claudia
Mengoni, Alberto
Pignatari, Marco
Priller, Alfred
Reifarth, Rene
Steier, Peter
Szentmiklosi, Laszlo
author_facet Wallner, Anton
Belgya, Tamas
Buczak, Kathrin
Coquard, Laurent
Bichler, Max
Dillmann, Iris
Golser, Robin
Käppeler, Franz
Karakas, Amanda
Kutschera, Walter
Lederer, Claudia
Mengoni, Alberto
Pignatari, Marco
Priller, Alfred
Reifarth, Rene
Steier, Peter
Szentmiklosi, Laszlo
author_sort Wallner, Anton
collection CERN
description Accelerator mass spectrometry (AMS) represents a complementary approach for precise measurements of neutron capture cross sections, e.g., for nuclear astrophysics. This technique, completely independent of previous experimental methods, was applied for the measurement of the Fe54(n,γ)Fe55 reaction. Following a series of irradiations with neutrons from cold and thermal to keV energies, the produced long-lived Fe55 nuclei (t1/2=2.744+−0.009) yr) were analyzed at the Vienna Environmental Research Accelerator. A reproducibility of about 1% could be achieved for the detection of Fe55, yielding cross-section uncertainties of less than 3%. Thus, this method produces new and precise data that can serve as anchor points for time-of-flight experiments. We report significantly improved neutron capture cross sections at thermal energy (σth=2.30±0.07 b) as well as for a quasi-Maxwellian spectrum of kT=25 keV (σ=30.3±1.2 mb) and for En=481±53 keV (σ=6.01±0.23 mb). The new experimental cross sections have been used to deduce improved Maxwellian-averaged cross sections in the temperature regime of the common s-process scenarios. The astrophysical impact is discussed by using stellar models for low-mass asymptotic giant branch stars.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
record_format invenio
spelling cern-22363152023-05-06T02:40:09Zdoi:10.1103/PhysRevC.96.025808http://cds.cern.ch/record/2236315engWallner, AntonBelgya, TamasBuczak, KathrinCoquard, LaurentBichler, MaxDillmann, IrisGolser, RobinKäppeler, FranzKarakas, AmandaKutschera, WalterLederer, ClaudiaMengoni, AlbertoPignatari, MarcoPriller, AlfredReifarth, ReneSteier, PeterSzentmiklosi, LaszloPrecise measurement of the thermal and stellar $^{54}$Fe($n, \gamma$)$^{55}$Fe cross sections via AMSastro-ph.SRAstrophysics and Astronomynucl-exNuclear Physics - ExperimentAccelerator mass spectrometry (AMS) represents a complementary approach for precise measurements of neutron capture cross sections, e.g., for nuclear astrophysics. This technique, completely independent of previous experimental methods, was applied for the measurement of the Fe54(n,γ)Fe55 reaction. Following a series of irradiations with neutrons from cold and thermal to keV energies, the produced long-lived Fe55 nuclei (t1/2=2.744+−0.009) yr) were analyzed at the Vienna Environmental Research Accelerator. A reproducibility of about 1% could be achieved for the detection of Fe55, yielding cross-section uncertainties of less than 3%. Thus, this method produces new and precise data that can serve as anchor points for time-of-flight experiments. We report significantly improved neutron capture cross sections at thermal energy (σth=2.30±0.07 b) as well as for a quasi-Maxwellian spectrum of kT=25 keV (σ=30.3±1.2 mb) and for En=481±53 keV (σ=6.01±0.23 mb). The new experimental cross sections have been used to deduce improved Maxwellian-averaged cross sections in the temperature regime of the common s-process scenarios. The astrophysical impact is discussed by using stellar models for low-mass asymptotic giant branch stars.The detection of long-lived radionuclides through ultra-sensitive single atom counting via accelerator mass spectrometry (AMS) offers opportunities for precise measurements of neutron capture cross sections, e.g. for nuclear astrophysics. The technique represents a truly complementary approach, completely independent of previous experimental methods. The potential of this technique is highlighted at the example of the $^{54}$Fe($n, \gamma$)$^{55}$Fe reaction. Following a series of irradiations with neutrons from cold and thermal to keV energies, the produced long-lived $^{55}$Fe nuclei ($t_{1/2}=2.744(9)$ yr) were analyzed at the Vienna Environmental Research Accelerator (VERA). A reproducibility of about 1% could be achieved for the detection of $^{55}$Fe, yielding cross section uncertainties of less than 3%. Thus, the new data can serve as anchor points to time-of-flight experiments. We report significantly improved neutron capture cross sections at thermal energy ($\sigma_{th}=2.30\pm0.07$ b) as well as for a quasi-Maxwellian spectrum of $kT=25$ keV ($\sigma=30.3\pm1.2$ mb) and for $E_n=481\pm53$ keV ($\sigma= 6.01\pm0.23$ mb). The new experimental cross sections have been used to deduce improved Maxwellian average cross sections in the temperature regime of the common $s$-process scenarios. The astrophysical impact is discussed using stellar models for low-mass AGB stars.arXiv:1611.09006oai:cds.cern.ch:22363152016-11-28
spellingShingle astro-ph.SR
Astrophysics and Astronomy
nucl-ex
Nuclear Physics - Experiment
Wallner, Anton
Belgya, Tamas
Buczak, Kathrin
Coquard, Laurent
Bichler, Max
Dillmann, Iris
Golser, Robin
Käppeler, Franz
Karakas, Amanda
Kutschera, Walter
Lederer, Claudia
Mengoni, Alberto
Pignatari, Marco
Priller, Alfred
Reifarth, Rene
Steier, Peter
Szentmiklosi, Laszlo
Precise measurement of the thermal and stellar $^{54}$Fe($n, \gamma$)$^{55}$Fe cross sections via AMS
title Precise measurement of the thermal and stellar $^{54}$Fe($n, \gamma$)$^{55}$Fe cross sections via AMS
title_full Precise measurement of the thermal and stellar $^{54}$Fe($n, \gamma$)$^{55}$Fe cross sections via AMS
title_fullStr Precise measurement of the thermal and stellar $^{54}$Fe($n, \gamma$)$^{55}$Fe cross sections via AMS
title_full_unstemmed Precise measurement of the thermal and stellar $^{54}$Fe($n, \gamma$)$^{55}$Fe cross sections via AMS
title_short Precise measurement of the thermal and stellar $^{54}$Fe($n, \gamma$)$^{55}$Fe cross sections via AMS
title_sort precise measurement of the thermal and stellar $^{54}$fe($n, \gamma$)$^{55}$fe cross sections via ams
topic astro-ph.SR
Astrophysics and Astronomy
nucl-ex
Nuclear Physics - Experiment
url https://dx.doi.org/10.1103/PhysRevC.96.025808
http://cds.cern.ch/record/2236315
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