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Title: Measurement of the {sup 151}Sm(n,{gamma}) cross section from 0.6 eV to 1 MeV via the neutron time-of-flight technique at the CERN n{sub T}OF facility

Abstract

The {sup 151}Sm(n,{gamma}) cross section was measured with the time-of-flight technique from 0.6 eV up to 1 MeV relative to the Au standard with an overall uncertainty of typically 6%. Neutrons were produced by spallation at the innovative n{sub T}OF facility at CERN; the {gamma} rays from capture events were detected with organic C{sub 6}D{sub 6} scintillators. Experimental setup and data analysis procedures are described with emphasis on the corrections for detection efficiency, background subtraction, and neutron flux determination. At low energies, resonances could be resolved up to about 1 keV, yielding a resonance integral of 3575{+-}210 b, an average s-wave resonance spacing of <D{sub 0}>=1.49{+-}0.07 eV, and a neutron strength function of <S{sub 0}>=(3.87{+-}0.33)x10{sup -4}. Maxwellian-averaged capture cross sections are reported for thermal energies between 5 and 100 keV. These results are of relevance for nuclear structure studies, nuclear astrophysics, and nuclear technology. The new value of the Maxwellian-averaged cross section at kT=30 keV is 3.08{+-}0.15 b, considerably larger than previous theoretical estimates, and provides better constraints for the thermodynamic conditions during the occurrence of the slow neutron capture process in low-mass stars during their asymptotic giant branch phase.

Authors:
; ; ;  [1]; ; ; ;  [2]; ; ; ; ; ; ;  [3]; ; ; ; ;  [4]
  1. Dipartimento di Fisica and INFN Bari (Italy)
  2. Instituto Nazionale di Fisica Nucleare Sezione di Trieste (Italy)
  3. CEA/Saclay-DSM/DAPNIA/SPhN, Gif-sur-Yvette (France)
  4. Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Madrid (Spain) (and others)
Publication Date:
OSTI Identifier:
20771351
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.73.034604; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CAPTURE; CERN; CORRECTIONS; CROSS SECTIONS; EFFICIENCY; EV RANGE; GAMMA RADIATION; KEV RANGE; MEV RANGE; NEUTRON FLUX; NEUTRON REACTIONS; NUCLEAR STRUCTURE; RESONANCE; S WAVES; SAMARIUM 151; SLOW NEUTRONS; SPALLATION; STRENGTH FUNCTIONS; TIME-OF-FLIGHT METHOD

Citation Formats

Marrone, S., Colonna, N., Tagliente, G., Terlizzi, R., Abbondanno, U., Fujii, K., Milazzo, P. M., Moreau, C., Aerts, G., Andriamonje, S., Berthomieux, E., Gunsing, F., Pancin, J., Perrot, L., Plukis, A., Alvarez-Velarde, F., Cano-Ott, D., Embid-Segura, M., Gonzalez-Romero, E., and Villamarin-Fernandez, D. Measurement of the {sup 151}Sm(n,{gamma}) cross section from 0.6 eV to 1 MeV via the neutron time-of-flight technique at the CERN n{sub T}OF facility. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.034604.
Marrone, S., Colonna, N., Tagliente, G., Terlizzi, R., Abbondanno, U., Fujii, K., Milazzo, P. M., Moreau, C., Aerts, G., Andriamonje, S., Berthomieux, E., Gunsing, F., Pancin, J., Perrot, L., Plukis, A., Alvarez-Velarde, F., Cano-Ott, D., Embid-Segura, M., Gonzalez-Romero, E., & Villamarin-Fernandez, D. Measurement of the {sup 151}Sm(n,{gamma}) cross section from 0.6 eV to 1 MeV via the neutron time-of-flight technique at the CERN n{sub T}OF facility. United States. doi:10.1103/PhysRevC.73.034604.
Marrone, S., Colonna, N., Tagliente, G., Terlizzi, R., Abbondanno, U., Fujii, K., Milazzo, P. M., Moreau, C., Aerts, G., Andriamonje, S., Berthomieux, E., Gunsing, F., Pancin, J., Perrot, L., Plukis, A., Alvarez-Velarde, F., Cano-Ott, D., Embid-Segura, M., Gonzalez-Romero, E., and Villamarin-Fernandez, D. Wed . "Measurement of the {sup 151}Sm(n,{gamma}) cross section from 0.6 eV to 1 MeV via the neutron time-of-flight technique at the CERN n{sub T}OF facility". United States. doi:10.1103/PhysRevC.73.034604.
@article{osti_20771351,
title = {Measurement of the {sup 151}Sm(n,{gamma}) cross section from 0.6 eV to 1 MeV via the neutron time-of-flight technique at the CERN n{sub T}OF facility},
author = {Marrone, S. and Colonna, N. and Tagliente, G. and Terlizzi, R. and Abbondanno, U. and Fujii, K. and Milazzo, P. M. and Moreau, C. and Aerts, G. and Andriamonje, S. and Berthomieux, E. and Gunsing, F. and Pancin, J. and Perrot, L. and Plukis, A. and Alvarez-Velarde, F. and Cano-Ott, D. and Embid-Segura, M. and Gonzalez-Romero, E. and Villamarin-Fernandez, D.},
abstractNote = {The {sup 151}Sm(n,{gamma}) cross section was measured with the time-of-flight technique from 0.6 eV up to 1 MeV relative to the Au standard with an overall uncertainty of typically 6%. Neutrons were produced by spallation at the innovative n{sub T}OF facility at CERN; the {gamma} rays from capture events were detected with organic C{sub 6}D{sub 6} scintillators. Experimental setup and data analysis procedures are described with emphasis on the corrections for detection efficiency, background subtraction, and neutron flux determination. At low energies, resonances could be resolved up to about 1 keV, yielding a resonance integral of 3575{+-}210 b, an average s-wave resonance spacing of <D{sub 0}>=1.49{+-}0.07 eV, and a neutron strength function of <S{sub 0}>=(3.87{+-}0.33)x10{sup -4}. Maxwellian-averaged capture cross sections are reported for thermal energies between 5 and 100 keV. These results are of relevance for nuclear structure studies, nuclear astrophysics, and nuclear technology. The new value of the Maxwellian-averaged cross section at kT=30 keV is 3.08{+-}0.15 b, considerably larger than previous theoretical estimates, and provides better constraints for the thermodynamic conditions during the occurrence of the slow neutron capture process in low-mass stars during their asymptotic giant branch phase.},
doi = {10.1103/PhysRevC.73.034604},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 73,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}