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Y., K.; Lu, Jingbin; Ruan, Shengping; Yang, Dong; Li, J.; Liu, Y. Z.; J., Y.; Wu, X. G.; Zheng, Y.; He, Chun

doi:10.1103/physrevc.88.057302

Cited by 14 publications

(31 citation statements)

References 16 publications

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“…Within ∼51 d of live time, the energy spectrum in the range from 0.4 to 11.6 MeV ee were recorded continuously except during a few hours of 228 Th calibrations and pulser measurements carried out about every 10 d. Table 10 Reactor physics input for the calculation of the neutrons produced in the reactor core that is used for the normalization of the MC simulation. fission isotope energy release per fission [MeV] [45] fission fraction [46], [47] In this way, the stability of the energy scale and detection efficiency was checked as described in Section 2.2. Small fluctuations within a standard deviation of about 1 keV ee in the large energy range were observed.…”

Section: Measurement Campaign With Conrad Detectormentioning

confidence: 99%

Neutron-induced background in the CONUS experiment

Hakenmüller

Buck

Fülber³

et al. 2019

Eur. Phys. J. C

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CONUS is a novel experiment aiming at detecting elastic neutrino nucleus scattering in the almost fully coherent regime using high-purity germanium (Ge) detectors and a reactor as antineutrino source. The detector setup is installed at the commercial nuclear power plant in Brokdorf, Germany, at a close distance to the reactor core to guarantee a high antineutrino flux. A good understanding of neutron-induced backgrounds is required, as the neutron recoil signals can mimic the predicted neutrino interactions. Especially events correlated with the reactor thermal power are troublesome. On-site measurements revealed such a correlated, highly thermalized neutron field with a maximum fluence rate of (745±30) cm −2 d −1 . These neutrons, produced inside the reactor core, are reduced by a factor of ∼10 20 on their way to the CONUS shield. With a high-purity Ge detector without shield the γ-ray background was examined including thermal power correlated 16 N decay products and neutron capture γ-lines. Using the measured neutron spectrum as input, Monte Carlo simulations demonstrated that the thermal power correlated field is successfully mitigated by the CONUS shield. The reactor-induced background contribution in the region of interest is exceeded by the expected signal by at least one order of magnitude assuming a realistic ionization quenching factor.Keywords neutron spectrometry · Bonner sphere spectrometer · neutron attenuation · low background gamma-ray spectroscopy · low radioactive material selection · neutron capture · radiation shield · Monte Carlo simulation · coherent elastic neutrino nucleus scattering a

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Section: Measurement Campaign With Conrad Detectormentioning

confidence: 99%

Neutron-induced background in the CONUS experiment

Hakenmüller

Buck

Fülber³

et al. 2019

Eur. Phys. J. C

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“…Recently, an isobaric ratio methods have also been proposed to determine the temperature of IMFs. It shows that the primary IMFs reflect a temperature around 5 MeV [32,33], while the cold IMFs reflect much lower temperature [16,[34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…The fragments may have different temperatures in the experiments. For example, in peripheral collisions the temperatures are different [47,52], and it is also shown that temperature depends on the isospin of the reaction system [34,35,56]. In this article, in the framework of the thermodynamics model, a thermometer is proposed to extract the temperature from the IMFs via the difference between IYRs, which is improved from the IYR method [34,35].…”

Section: Introductionmentioning

confidence: 99%

Improved thermometer for intermediate-mass fragments in heavy-ion collisions with isobaric yield ratio difference

Ding

Qiao

et al. 2015

Phys. Rev. C

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Background: Temperature is an important parameter in studying many important questions in heavy-ion collisions. A thermometer based on the isobaric yield ratio (IYR) has been proposed [Ma et al., Phys. Rev. C 86, 054611 (2012) and Ma et al., ibid., Phys. Rev. C 88, 014609 (2013)].Purpose: An improved thermometer (TIB) is proposed based on the difference between IYRs. TIB obtained from isobars in different reactions will be compared.Methods: The yields of three isobars are employed in TIB. The residual free energy of the three isobars are replaced by that of the binding energy. No secondary decay modification for odd A fragment is used in TIB. Results:The measured fragment yields in the 140A MeV 40,48 Ca + 9 Be ( 181 Ta) and 58,64 Ni + 9 Be ( 181 Ta), the 1A GeV 124,136 Xe + Pb, and the 112,124 Sn + 112,124 Sn reactions have been analyzed to obtain TIB from IMFs. TIB from most of the fragments in the 40,48 Ca and 58,64 Ni reactions is in the range of 0.6 MeV < TIB < 3.5 MeV. TIB from most of the fragments in the 124 Xe and 112,124 Sn reactions is in the range of 0.5 MeV < TIB < 2.5 MeV, while the range is 0.5 MeV < TIB < 4 MeV from most of the fragments in the 136 Xe reaction. In general, for most of the fragments TIB in the 40,48 Ca and 58,64 Ni reactions are very similar (except in the very neutron-rich fragments), and TIB from IMFs in the 124,136 Xe and 112,124 Sn reactions is also similar. A slightly dependence of TIB on A is found.Conclusions: Using the binding energy of the nucleus, TIB can be obtained without the knowledge of the free energies of fragments. In the investigated reactions, TIB from most of the IMFs is low.

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“…The corresponding effective energies per fission are determined from the energy released in fission, minus the energy carried off by the antineutrinos, plus the energy produced by neutron captures on the reactor materials. The evaluated (22,23,24) energies, ei, are given in Table 1. The corresponding estimated uncertainties are 0.25-0.5 %.…”

Section: Nuclear Reactors As Electron Antineutrino Sourcesmentioning

confidence: 99%

Reactor Neutrino Spectra

Hayes

Vogel

2016

Annu. Rev. Nucl. Part. Sci.

129

120

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We present a review of the antineutrino spectra emitted from reactors. Knowledge of these and their associated uncertainties are crucial for neutrino oscillation studies. The spectra used to-date have been determined by either conversion of measured electron spectra to antineutrino spectra or by summing over all of the thousands of transitions that makeup the spectra using modern databases as input. The uncertainties in the subdominant corrections to beta-decay plague both methods, and we provide estimates of these uncertainties. Improving on current knowledge of the antineutrino spectra from reactors will require new experiments. Such experiments would also address the so-called reactor neutrino anomaly and the possible origin of the shoulder observed in the antineutrino spectra measured in recent high-statistics reactor neutrino experiments.Comment: Submitted for publication in the Annual Review of Nuclear and Particle Science, Vol.6

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Observation of a secondπh11/2⊗νh11/2band in

Cited by 14 publications

References 16 publications

Neutron-induced background in the CONUS experiment

Neutron-induced background in the CONUS experiment

Improved thermometer for intermediate-mass fragments in heavy-ion collisions with isobaric yield ratio difference

Reactor Neutrino Spectra

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