Deducing the 
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) cross section using the surrogate ratio method

Burke, J. T.; Bernstein, L. A.; Escher, Jutta; Ahle, L.; Church, Jennifer; Dietrich, Frank; Moody, Κ. J.; Norman, E. B.; Phair, L.; Fallon, P.; Clark, R. M.; Deleplanque, M. A.; Descovich, M.; Cromaz, M.; Lee, I. Y.; Macchiavelli, A. O.; McMahan, M. A.; Moretto, L.G.; Rodriguez‐Vieitez, Elena; Stephens, F. S.; Ai, H.; Plettner, C.; Beausang, C. W.; Crider, B.

doi:10.1103/physrevc.73.054604

Cited by 72 publications

(56 citation statements)

References 11 publications

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“…This is different from surrogate applications to (n,f) reactions. In the fission case the G CN χ= f ission (E ex , J, π) are much less sensitive to spin and parity and approximations can be employed which allow for analysis methods that do not require the knowledge of the CN spin-parity distributions [17][18][19][20].…”

Section: Of the Desired Reaction See Eq 2 The Decay Probabilities mentioning

confidence: 99%

Compound-nuclear reactions with unstable nuclei: Constraining theory through innovative experimental approaches

Escher

Tonchev

Burke

et al. 2016

EPJ Web of Conferences

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Abstract. Cross sections for compound-nuclear reactions involving unstable targets are important for many applications, but can often not be measured directly. Several indirect methods have recently been proposed to determine neutron capture cross sections for unstable isotopes. We consider three approaches that aim at constraining statistical calculations of capture cross sections with data obtained from the decay of the compound nucleus relevant to the desired reaction. Each method produces this compound nucleus in a different manner (via a light-ion reaction, a photon-induced reaction, or β-decay) and requires additional ingredients to yield the sought-after cross section. We give a brief outline of the approaches and employ preliminary results from recent measurements to illustrate the methods. We discuss the main advantages and challenges of each approach.

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Section: Of the Desired Reaction See Eq 2 The Decay Probabilities mentioning

confidence: 99%

Compound-nuclear reactions with unstable nuclei: Constraining theory through innovative experimental approaches

Escher

Tonchev

Burke

et al. 2016

EPJ Web of Conferences

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“…Particle data were taken with the Silicon Telescope Array for Reaction Studies (STARS) [6] consisting of three (∆E, E1, and E2) large-area, double-sided, annular Si detectors (segmented into rings, θ, and sectors, φ) configured in a ∆E − E telescope array at forward angles θ for ≈ 33 • − 41 • with respect to and symmetric about the beam axis (e.g., in azimuth, φ) and a single annular fission detector at backward angles θ back ≈ 31 • − 62 • with respect to and symmetric about the beam axis, φ. Coincident gamma-ray data were collected with the LivermoreBerkeley Array for Collaborative Experiments (LIBER-ACE) consisting of 5 Compton-suppressed HPGe clover detectors [20] arranged in 45 • increments within a single plane parallel to the beam axis. Figure 3 shows a schematic of the 235 U target and detector arrangement used in the present study.…”

Section: Methodsmentioning

confidence: 99%

“…The surrogate reaction technique, first applied in 1970 [1], has recently been the subject of intensive investigation [2][3][4][5][6][7][8][9][10][11][12][13] in order to establish its use and accuracy. The surrogate method (absolute [1] and ratio [4]) has been employed to circumvent technical challenges presented by the fabrication of unstable radioactive targets and the production of high-flux neutron beams.…”

Section: Introductionmentioning

confidence: 99%

Relative U235(n,γ) and (
Allmond
¹
,
Bernstein
²
,
Beausang
³

et al. 2009
Phys. Rev. C
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0
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Relative 235 U(n,γ) and (n,f) cross sections from 235 U(d,pγ) and (d,pf) The internal surrogate ratio method allows for the determination of an unknown cross section, such as (n,γ), relative to a better-known cross section, such as (n,f), by measuring the relative exitchannel probabilities of a surrogate reaction that proceeds through the same compound nucleus. The validity of the internal surrogate ratio method is tested by comparing the relative gamma and fission exit-channel probabilities of a 236 U * compound nucleus, formed in the 235 U(d,p) reaction, to the known 235 U(n,γ) and (n,f) cross sections. A model-independent method for measuring the gamma-channel yield is presented and used.

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“…Furthermore, there are indications that small to moderate deviations from the WE limit cancel in this approach [13]. Cross sections for (n,f) reactions extracted in the ratio approximation have been tested for consistency with results from direct measurements, complementary surrogate experiments [15,16], and theoretical simulations [13]. For (n,f) reactions one typically finds that the spin-parity mismatch between the desired and surrogate reactions has a much smaller effect on the extracted cross section than in an approach that uses the WE approximation and absolute probabilities.…”

Section: Neutron-induced Fission Reactionsmentioning

confidence: 99%

“…The Surrogate Ratio approach [13][14][15] requires the (approximate) validity of the Weisskopf-Ewing limit. The ratio…”

Section: Neutron-induced Fission Reactionsmentioning

confidence: 99%

Neutron-capture cross sections from indirect measurements

Escher

Burke

Dietrich

et al. 2012

EPJ Web of Conferences

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Abstract.Cross sections for compound-nuclear reactions reactions play an important role in models of astrophysical environments and simulations of the nuclear fuel cycle. Providing reliable cross section data remains a formidable task, and direct measurements have to be complemented by theoretical predictions and indirect methods. The surrogate nuclear reactions method provides an indirect approach for determining cross sections for reactions on unstable isotopes, which are difficult or impossible to measure otherwise. Current implementations of the method provide useful cross sections for (n,f) reactions, but need to be improved upon for applications to capture reactions.

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Deducing the U237 ( n,f ) cross section using the surrogate ratio method

Cited by 72 publications

References 11 publications

Compound-nuclear reactions with unstable nuclei: Constraining theory through innovative experimental approaches

Compound-nuclear reactions with unstable nuclei: Constraining theory through innovative experimental approaches

Relative U235(n,γ) and (
Allmond
¹
,
Bernstein
²
,
Beausang
³

et al. 2009
Phys. Rev. C
Self Cite
37
0
20
0
View full text Add to dashboard Cite

Neutron-capture cross sections from indirect measurements

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Deducing the U237 ( n,f ) cross section using the surrogate ratio method

Cited by 72 publications

References 11 publications

Compound-nuclear reactions with unstable nuclei: Constraining theory through innovative experimental approaches

Compound-nuclear reactions with unstable nuclei: Constraining theory through innovative experimental approaches

Relative U235(n,γ) and (Allmond1, Bernstein2, Beausang3 et al. 2009Phys. Rev. CSelf Cite370200View full textAdd to dashboardCite

Neutron-capture cross sections from indirect measurements

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About

Relative U235(n,γ) and (
Allmond
¹
,
Bernstein
²
,
Beausang
³

et al. 2009
Phys. Rev. C
Self Cite
37
0
20
0
View full text Add to dashboard Cite