Radiative-capture cross sections for the reaction using thermal neutrons and structural properties of
Abstract
A set of prompt partial $$\gamma$$-ray production cross sections from thermal neutron-capture were measured for the $$^{139}$$La($$n,\gamma$$) reaction using a guided beam of subthermal (thermal and cold) neutrons incident upon a $$^{\rm nat}$$La$$_{2}$$O$$_{3}$$ target at the Prompt Gamma Activation Analysis facility of the Budapest Research Reactor. Absolute $$^{140}$$La cross sections were determined relative to the well-known comparator $$^{35}$$Cl($$n,\gamma$$) cross sections from the irradiation of a stoichiometric $$^{\rm nat}$$LaCl$$_{3}$$ sample. The total cross section for radiative thermal neutron-capture on $$^{139}$$La from the sum of experimentally measured cross sections observed to directly feed the $$^{140}$$La ground state was determined to be $$\sigma_{0}^{\rm expt} = 8.58(50)$$~b. To assess completeness of the decay scheme and as a consistency check, the measured cross sections for transitions feeding the ground state from levels below a critical energy of $$E_{c} = 285$$~keV were combined with a modeled contribution accounting for ground-state feeding from the quasicontinuum to arrive at a total cross section of $$\sigma_{0} = 9.36(74)$$~b. In addition, a neutron-separation energy of $$S_{n} = 5161.005(21)$$~keV was determined from a least-squares fit of the measured primary $$\gamma$$-ray energies to the low-lying levels of the $$^{140}$$La decay scheme. Furthermore, several nuclear structure improvements are proposed for the decay scheme. The measured cross-section and separation-energy results are comparable to earlier measurements of these quantities.
- Authors:
-
- Univ. of California, Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Hungarian Academy of Sciences, Budapest (Hungary); Technische Univ. München, Garching (Germany)
- Hungarian Academy of Sciences, Budapest (Hungary)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Charles Univ. in Prague, Prague (Czech Republic)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1564009
- Alternate Identifier(s):
- OSTI ID: 1494653; OSTI ID: 1765298; OSTI ID: 1826100
- Report Number(s):
- LLNL-JRNL-737500
Journal ID: ISSN 2469-9985; PRVCAN; ark:/13030/qt9gm5v7b6; TRN: US2000815
- Grant/Contract Number:
- AC02-05CH11231; AC52-07NA27344; NA0003180; NA0000979
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 2; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Energy levels & level densities; nuclear reactions; nuclear structure & decays; radiative capture; 139La(n, γ), E=thermal and cold; measured Eγ, Iγ, at the Prompt Gamma Activation Analysis facility of Budapest Research Reactor. 140La; deduced levels, J, π, S(n) for 140La, partial γ-ray production σ(γ) relative to those for 35Cl(n, γ), total radiative thermal neutron capture σ. Monte Carlo statistical-decay code DICEBOX calculations. Comparison with previous experimental data in the ENSDF database and other literature.
Citation Formats
Hurst, A. M., Sweet, A., Goldblum, B. L., Firestone, R. B., Basunia, M. S., Bernstein, L. A., Révay, Zs., Szentmiklósi, L., Belgya, T., Escher, J. E., Harsányi, I., Krtička, M., Sleaford, B. W., and Vujic, J. Radiative-capture cross sections for the La139(n,γ) reaction using thermal neutrons and structural properties of La140. United States: N. p., 2019.
Web. doi:10.1103/physrevc.99.024310.
Hurst, A. M., Sweet, A., Goldblum, B. L., Firestone, R. B., Basunia, M. S., Bernstein, L. A., Révay, Zs., Szentmiklósi, L., Belgya, T., Escher, J. E., Harsányi, I., Krtička, M., Sleaford, B. W., & Vujic, J. Radiative-capture cross sections for the La139(n,γ) reaction using thermal neutrons and structural properties of La140. United States. https://doi.org/10.1103/physrevc.99.024310
Hurst, A. M., Sweet, A., Goldblum, B. L., Firestone, R. B., Basunia, M. S., Bernstein, L. A., Révay, Zs., Szentmiklósi, L., Belgya, T., Escher, J. E., Harsányi, I., Krtička, M., Sleaford, B. W., and Vujic, J. Wed .
"Radiative-capture cross sections for the La139(n,γ) reaction using thermal neutrons and structural properties of La140". United States. https://doi.org/10.1103/physrevc.99.024310. https://www.osti.gov/servlets/purl/1564009.
@article{osti_1564009,
title = {Radiative-capture cross sections for the La139(n,γ) reaction using thermal neutrons and structural properties of La140},
author = {Hurst, A. M. and Sweet, A. and Goldblum, B. L. and Firestone, R. B. and Basunia, M. S. and Bernstein, L. A. and Révay, Zs. and Szentmiklósi, L. and Belgya, T. and Escher, J. E. and Harsányi, I. and Krtička, M. and Sleaford, B. W. and Vujic, J.},
abstractNote = {A set of prompt partial $\gamma$-ray production cross sections from thermal neutron-capture were measured for the $^{139}$La($n,\gamma$) reaction using a guided beam of subthermal (thermal and cold) neutrons incident upon a $^{\rm nat}$La$_{2}$O$_{3}$ target at the Prompt Gamma Activation Analysis facility of the Budapest Research Reactor. Absolute $^{140}$La cross sections were determined relative to the well-known comparator $^{35}$Cl($n,\gamma$) cross sections from the irradiation of a stoichiometric $^{\rm nat}$LaCl$_{3}$ sample. The total cross section for radiative thermal neutron-capture on $^{139}$La from the sum of experimentally measured cross sections observed to directly feed the $^{140}$La ground state was determined to be $\sigma_{0}^{\rm expt} = 8.58(50)$~b. To assess completeness of the decay scheme and as a consistency check, the measured cross sections for transitions feeding the ground state from levels below a critical energy of $E_{c} = 285$~keV were combined with a modeled contribution accounting for ground-state feeding from the quasicontinuum to arrive at a total cross section of $\sigma_{0} = 9.36(74)$~b. In addition, a neutron-separation energy of $S_{n} = 5161.005(21)$~keV was determined from a least-squares fit of the measured primary $\gamma$-ray energies to the low-lying levels of the $^{140}$La decay scheme. Furthermore, several nuclear structure improvements are proposed for the decay scheme. The measured cross-section and separation-energy results are comparable to earlier measurements of these quantities.},
doi = {10.1103/physrevc.99.024310},
journal = {Physical Review C},
number = 2,
volume = 99,
place = {United States},
year = {Wed Feb 13 00:00:00 EST 2019},
month = {Wed Feb 13 00:00:00 EST 2019}
}
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