Measurement of the 2200 m/sec neutron-proton capture cross section

Cokinos, D.; Melkonian, E.

doi:10.1103/physrevc.15.1636

Cited by 36 publications

(30 citation statements)

References 24 publications

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“…Figure 2 shows the time difference between selected neutron candidates and their primary interaction. Fitting this distribution yields a neutron capture time of 205.2 ± 3.7μs, in good agreement with existing measurements [3]. Application of this tagging to the atmospheric neutrino data set is expected to help distinguish CC antineutrino interactions, which are accompanied by a neutron at the primary vertex, from neutrino interactions and to help reduce backgrounds to proton decay searches.…”

Section: Detector and Data Setsupporting

confidence: 82%

Atmospheric results from Super-Kamiokande

Wendell¹

2015

AIP Conference Proceedings

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Abstract. Recent results from a 282 kiloton-year exposure of the Super-Kamiokande detector to atmospheric neutrinos are presented. The data when fit both by themselves and in conjunction with constraints from the T2K and reactor neutrino experiments show a weak, though insignificant, preference for the normal mass hierarchy at the level of∼ 1σ . Searches for evidence of oscillations into a sterile neutrino have resulted in limits on the parameters governing their mixing, |U μ4 | 2 < 0.041 and |U τ4 | 2 < 0.18 at 90% C.L. A similar search for an indication of Lorentz-invariance violating oscillations has yielded limits three to seven orders of magnitude more stringent than existing measurements. Additionally, analyses searching for an excess of neutrinos in the atmospheric data produced from the annihilation of dark matter particles in the galaxy and sun have placed tight limits on the cross sections governing their annihilation and scattering.

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Section: Detector and Data Setsupporting

confidence: 82%

Atmospheric results from Super-Kamiokande

Wendell¹

2015

AIP Conference Proceedings

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“…The combined neutron capture time in water was measured to be (202.6±3.7) µs, which was in good agreement with the (204.7±0.4) µs in Ref. [28]. Combining the neutron tagging efficiencies of the three source positions gave a weighted average of (10.6 ± 0.2)%, which was compared to the neutron tagging efficiency ǫ n in Section V A 2.The maximum percent difference between the optimal signal efficiency found in Section V A 2 (9.6%) and the neutron tagging efficiency determined using the Am/Be source was calculated to be 10.4%.…”

Section: Neutron Tagging Uniformity and Validationsupporting

confidence: 74%

First measurement of radioactive isotope production through cosmic-ray muon spallation in Super-Kamiokande IV

Zhang¹,

Abe²,

Haga³

et al. 2016

Phys. Rev. D

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2Cosmic-ray-muon spallation-induced radioactive isotopes with β decays are one of the major backgrounds for solar, reactor, and supernova relic neutrino experiments. Unlike in scintillator, production yields for cosmogenic backgrounds in water have not been exclusively measured before, yet they are becoming more and more important in next generation neutrino experiments designed to search for rare signals. We have analyzed the low-energy trigger data collected at Super-Kamiokande-IV in order to determine the production rates of 12 B, 12 N, 16 N, 11 Be, 9 Li, 8 He, 9 C, 8 Li, 8 B and 15 C. These rates were extracted from fits to time differences between parent muons and subsequent daughter β's by fixing the known isotope lifetimes. Since 9 Li can fake an inverse-beta-decay reaction chain via a β + n cascade decay, producing an irreducible background with detected energy up to a dozen MeV, a dedicated study is needed for evaluating its impact on future measurements; the application of a neutron tagging technique using correlated triggers was found to improve this 9 Li measurement. The measured yields were generally found to be comparable with theoretical calculations, except the cases of the isotopes 8 Li/ 8 B and 9 Li.

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“…It also uses a new treatment of photon channels in R-matrix theory that is more consistent with identifying the vector potential with a photon "wavefunction". In the last stages of the analysis, the thermal capture cross section was forced to a value of 332.0 mb (as in ENDF/B-VI.8), rather than the "best" experimental value of 332.6 ±0.7 mb [179], since criticality data testing of aqueous thermal systems showed a slight preference for the lower value. Also, the latest measurement [180] of the coherent n − p scattering length was used, resulting in close agreement with that value, and with an earlier measurement of the thermal scattering cross section [181], but not with a later, more precise value [182].…”

Section: F Light Element Evaluationsmentioning

confidence: 99%

ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology

Chadwick

Obložinský

Herman

et al. 2006

Nuclear Data Sheets

1,961

908

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We describe the next generation general purpose Evaluated Nuclear Data File, ENDF/B-VII.0, of recommended nuclear data for advanced nuclear science and technology applications. The library, released by the U.S. Cross Section Evaluation Working Group (CSEWG) in December 2006, contains data primarily for reactions with incident neutrons, protons, and photons on almost 400 isotopes. The new evaluations are based on both experimental data and nuclear reaction theory predictions.The principal advances over the previous ENDF/B-VI library are the following: (1) New cross sections for U, Pu, Th, Np and Am actinide isotopes, with improved performance in integral validation criticality and neutron transmission benchmark tests; (2) More precise standard cross sections for neutron reactions on H, 6 Li, 10 B, Au and for 235,238 U fission, developed by a collaboration with the IAEA and the OECD/NEA Working Party on Evaluation Cooperation (WPEC); (3) Improved thermal neutron scattering; (4) An extensive set of neutron cross sections on fission products developed through a WPEC collaboration; (5) A large suite of photonuclear reactions; (6) Extension of many neutron-and proton-induced reactions up to an energy of 150 MeV; (7) Many new light nucleus neutron and proton reactions; (8) Post-fission beta-delayed photon decay spectra; (9) New radioactive decay data; and (10) New methods developed to provide uncertainties and covariances, together with covariance evaluations for some sample cases.The paper provides an overview of this library, consisting of 14 sublibraries in the same, ENDF-6 format, as the earlier ENDF/B-VI library. We describe each of the 14 sublibraries, focusing on neutron reactions. Extensive validation, using radiation transport codes to simulate measured critical assemblies, show major improvements: (a) The long-standing underprediction of low enriched U thermal assemblies is removed; (b) The 238 U, 208 Pb, and 9 Be reflector biases in fast systems are largely removed; (c) ENDF/B-VI.8 good agreement for simulations of highly enriched uranium assemblies is preserved; (d) The underprediction of fast criticality of 233,235 U and 239 Pu assemblies is removed; and (e) The intermediate spectrum critical assemblies are predicted more accurately.We anticipate that the new library will play an important role in nuclear technology applications, including transport simulations supporting national security, nonproliferation, advanced reactor and fuel cycle concepts, criticality safety, medicine, space applications, nuclear astrophysics, and nuclear physics facility design. The ENDF/B-VII.0 library is archived at the National Nuclear Data Center,

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Measurement of the 2200 m/sec neutron-proton capture cross section

Cited by 36 publications

References 24 publications

Atmospheric results from Super-Kamiokande

Atmospheric results from Super-Kamiokande

First measurement of radioactive isotope production through cosmic-ray muon spallation in Super-Kamiokande IV

ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology

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