(n,γ) measurements on radioactive isotopes with DANCE

Reifarth, R.; Esch, Ernst I; Alpizar‐Vicente, A. M.; Bond, E. M.; Bredeweg, T. A.; Glover, S. E.; Greife, U.; Hatarik, R.; Haight, R. C.; Kronenberg, A. K.; O’Donnell, J. M.; Rundberg, R. S.; Schwantes, Jon M.; Ullmann, J. L.; Vieira, D. J.; Wilhelmy, J. B.; Wouters, J.M.

doi:10.1016/j.nimb.2005.07.022

Cited by 21 publications

(6 citation statements)

References 5 publications

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“…At present there are several neutron ToF facilities in the world devoted to the measurement of neutron-induced reactions cross sections. These use different methods for neutron production and have flight path lengths ranging between less than one meter to 400 m. Among these, the most active in the recent years are (flight paths are given in parenthesis) the n TOF facility [11][12][13][14] (185 m) discussed further in this paper, GELINA at JRC-IRMM in Belgium [15] (10,30,50,60,100,200, 300 and 400 m), DANCE at LANSCE in the USA [16] (20 m) and AN-NRI at J-PARK in Japan [17] (22 and 28 m). In addition, two new facilities will soon become operational in Europe: n TOF-EAR2 at CERN in Switzerland [18] (20 m) and FRANZ in Germany [19] (0.8 m).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Performance of the neutron time-of-flight facility n_TOF at CERN

Guerrero¹,

Tsinganis²,

Berthoumieux³

et al. 2013

Eur. Phys. J. A

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234

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Abstract. The neutron time-of-flight facility n TOF features a white neutron source produced by spallation through 20 GeV/c protons impinging on a lead target. The facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating at CERN between 2001 and 2004, and then underwent a major upgrade in 2008. This paper presents in detail all the characteristics of the new neutron beam in the currently available configurations, which correspond to two different collimation systems and two choices of neutron moderator. The characteristics discussed include the intensity and energy dependence of the neutron flux, the spatial profile of the beam, the in-beam background components and the energy resolution/broadening. The discussion of these features is based on dedicated measurements and Monte Carlo simulations, and includes estimations of the systematic uncertainties of the mentioned quantities.

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Section: Introduction and Objectivesmentioning

confidence: 99%

Performance of the neutron time-of-flight facility n_TOF at CERN

Guerrero¹,

Tsinganis²,

Berthoumieux³

et al. 2013

Eur. Phys. J. A

Self Cite

234

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“…At present, transmutation via neutron reactions is one of the leading avenues of research in the disposal of long-lived isotopes, produced during nuclearreactor fuel cycles. In this context, several new facilities at neutron sources have been developed, including the γcalorimeter DANCE at the Los Alamos Neutron Science Center [1], n_TOF at CERN [2], GELINA at Institute for Reference Materials and Measurements [3], and the nELBE at Helmholtz-Zentrum Dresden-Rossendorf [4]. In addition, nuclear reactions are an essential input into the production of isotopes for both medical and fundamental research purposes.…”

Section: Introductionmentioning

confidence: 99%

Comparison of statistical model calculations for stable isotope neutron capture

et al. 2014

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It is a well-observed result that different nuclear input models sensitively affect Hauser-Feshbach (HF) crosssection calculations. Less well-known, however, are the effects on calculations originating from nonmodel aspects, such as experimental data truncation and transmission function energy binning, as well as code-dependent aspects, such as the definition of level-density matching energy and the inclusion of shell correction terms in the level-density parameter. To investigate these aspects, Maxwellian-averaged neutron capture cross sections (MACS) at 30 keV have been calculated using the well-established statistical Hauser-Feshbach model codes TALYS and NON-SMOKER for approximately 340 nuclei. For the same nuclei, MACS predictions have also been obtained using two new HF codes, CIGAR and SAPPHIRE. Details of these two codes, which have been developed to contain an overlapping set of identically implemented nuclear physics input models, are presented. It is generally accepted that HF calculations are valid to within a factor of 3. It was found that this factor is dependent on both model and nonmodel details, such as the coarseness of the transmission function energy binning and data truncation, as well as variances in details regarding the implementation of level-density parameter, backshift, matching energy, and giant dipole strength function parameters.

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“…To date, calorimetric measurements performed using the high-efficiency, highly-segmented detector arrays of the CERN neutron time-of-flight facility (n TOF) [5] and the Detector for Advanced Neutron Capture Experiments (DANCE) [6] have reached a precision of ∼10% for isotopes with half-lives as short as ∼100 years [7]. This type of measurement becomes increasingly more difficult for isotopes with shorter halflives.…”

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confidence: 99%

“…These γ rays have been refered to as "statistical" γ rays in the literature [20,21] and this terminology will be used here to describe any γ ray that deposits energy above a selected energy threshold, E th , in a detector. Ultimately, nearly 100% efficiency could be obtained using a 4π calorimeter detector, such as DANCE [6].…”

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confidence: 99%

Statisticalγrays in the analysis of surrogate nuclear reactions

et al. 2012

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The surrogate nuclear reaction method is being applied in many efforts to indirectly determine neutron-induced reaction cross sections on short-lived isotopes. This technique aims to extract accurate (n,γ) cross sections from measured decay properties of the compound nucleus of interest (created using a different reaction). The advantages and limitations of a method that identifies the γ-ray decay channel by detecting any high-energy ("statistical") γ ray emitted during the relaxation of the compound nucleus were investigated. Data collected using the STARS/LiBerACE silicon and germanium detector arrays were used to study the decay of excited gadolinium nuclei following inelastic proton scattering. In many cases, this method of identifying the γ-ray decay channel can simplify the experimental data collection and greatly improve the detection efficiency for γ-ray cascades. The results show sensitivity to angular-momentum differences between the surrogate reaction and the desired (n,γ) reaction similar to an analysis performed using low-lying discrete transitions even when ratios of cross sections are considered.

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(n,γ) measurements on radioactive isotopes with DANCE

Cited by 21 publications

References 5 publications

Performance of the neutron time-of-flight facility n_TOF at CERN

Performance of the neutron time-of-flight facility n_TOF at CERN

Comparison of statistical model calculations for stable isotope neutron capture

Statisticalγrays in the analysis of surrogate nuclear reactions

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