Radiative-capture cross sections for the La139(n,γ) reaction using thermal neutrons and structural properties of La140

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.

doi:10.1103/physrevc.99.024310

Title: Radiative-capture cross sections for the ${}^{139}{La} (n, γ)$ reaction using thermal neutrons and structural properties of ${}^{140}{La}$

Journal Article · Wed Feb 13 00:00:00 EST 2019 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.99.024310· OSTI ID:1564009

Hurst, A. M. ^[1]; Sweet, A. ^[1]; Goldblum, B. L. ^[1]; Firestone, R. B. ^[1]; Basunia, M. S. ^[2]; Bernstein, L. A. ^[3]; Révay, Zs. ^[4]; Szentmiklósi, L. ^[5]; Belgya, T. ^[5]; Escher, J. E. ^[6]; Harsányi, I. ^[5]; Krtička, M. ^[7]; Sleaford, B. W. ^[6]; Vujic, J. ^[1]

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)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344; NA0003180; NA0000979

OSTI ID:: 1564009

Alternate ID(s):: OSTI ID: 1494653; OSTI ID: 1765298; OSTI ID: 1826100

Report Number(s):: LLNL-JRNL-737500; PRVCAN; ark:/13030/qt9gm5v7b6; TRN: US2000815

Journal Information:: Physical Review C, Vol. 99, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 4 works

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Title: Radiative-capture cross sections for the ${}^{139}{La} (n, γ)$ reaction using thermal neutrons and structural properties of ${}^{140}{La}$