Monte Carlo simulation of transfer reactions using extended R-matrix theory picturing surrogate-type WFCF features

Bouland, O.

doi:10.1051/epjconf/201611103003

Cited by 1 publication

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“…The regular W c,c definition has already been challenged in Ref. [15]. The outcome was a surrogate-dedicated formulation of W c,c which applied to the fissile 240 Pu* and fertile 241 Pu* compound nuclides demonstrated special behavior that we are not accustomed to deal with.…”

Section: Modified Wfcf Definition According To Surrogate Reactions (Wmentioning

confidence: 99%

Monte Carlo simulation of γ and fission transfer-induced probabilities using extended 𝓡-matrix theory: Application to the ²³⁷U^∗ system

Bouland

Jurado

2017

EPJ Web Conf.

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Abstract. This paper deals with simultaneous neutron-induced average partial cross sections and surrogatelike probability simulations over several excitation and de-excitation channels of the compound nucleus. Present calculations, based on one-dimensional fission barrier extended R-matrix theory using Monte Carlo samplings of both first and second well resonance parameters, avoid the surrogate-reaction method historically taken for surrogate data analyses that proved to be very poor in terms of extrapolated neutron-induced capture cross sections. Present theoretical approach is portrayed and subsequent results can be compared for the first time with experimental γ -decay probabilities; thanks to brand new simultaneous 238 U( 3 He, 4 Heγ ) and 238 U( 3 He, 4 He f) surrogate measurements. Future integration of our strategy in standard neutron cross section data evaluation remains tied to the developments made in terms of direct reaction population probability calculations. Context and objectivesThe idea to supplement neutron-induced cross-section data for actinides and higher transuranic nuclides with particle-transfer-induced reactions has been raised a long time ago [1]. Over the years, a variety of surrogate vectors have been used as stripping (d,p) and pickup (p,d) reactions, ( 3 He,p), ( 3 He,d) and ( 3 He,t) chargeexchange reactions or even two-neutron transfer reactions as (t,p) and (p,t) reactions. Analytical calculations of these measured direct-reaction fission probabilities were performed under several simplifications contained in the so-called surrogate-reaction method [2]. Early promising comparisons [1] made between extrapolated neutron fission cross sections and cross sections directly measured by neutron spectroscopy led to agreement within 10% to 20% at neutron energy above the nucleus pairing energy although exhibiting larger deviations at lower energies. Major limitations in surrogate extrapolation were promptly noticed [1,3] with the difficulty to estimate the compound nucleus formation cross section by neutron absorption, the possible influence of angular momentum differences between neutron capture and direct reactions and the validity of the Weisskopf-Ewing (WE) hypothesis related to fission decay probability spin-parity independence [4].A decade ago, surrogate reactions received renewed interest in terms either of simulation [5,6] or experimental investigation (initiated by study [7]; reviewed by Ref. [8]) to infer in addition to fission, neutron-induced capture cross sections. Newly measured decay capture probabilities were readily analyzed within the surrogatereaction method that proved to be very poor in terms of extrapolated neutron-induced capture cross sections [2]. a e-mail: olivier.bouland@cea.fr Indeed the surrogate-reaction method was understandable in the seventies because of computer limitations, lack of precise information on nuclear level densities across the deformation and difficulties for achieving confident optical model calculations over a large range of nuclides. Nowada...

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Section: Modified Wfcf Definition According To Surrogate Reactions (Wmentioning

confidence: 99%

Monte Carlo simulation of γ and fission transfer-induced probabilities using extended 𝓡-matrix theory: Application to the ²³⁷U^∗ system

Bouland

Jurado

2017

EPJ Web Conf.

View full text Add to dashboard Cite

show abstract

Monte Carlo simulation of transfer reactions using extended R-matrix theory picturing surrogate-type WFCF features

Cited by 1 publication

References 8 publications

Monte Carlo simulation of γ and fission transfer-induced probabilities using extended 𝓡-matrix theory: Application to the ²³⁷U^∗ system

Monte Carlo simulation of γ and fission transfer-induced probabilities using extended 𝓡-matrix theory: Application to the ²³⁷U^∗ system

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Monte Carlo simulation of transfer reactions using extended R-matrix theory picturing surrogate-type WFCF features

Cited by 1 publication

References 8 publications

Monte Carlo simulation of γ and fission transfer-induced probabilities using extended 𝓡-matrix theory: Application to the 237U∗ system

Monte Carlo simulation of γ and fission transfer-induced probabilities using extended 𝓡-matrix theory: Application to the 237U∗ system

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Monte Carlo simulation of γ and fission transfer-induced probabilities using extended 𝓡-matrix theory: Application to the ²³⁷U^∗ system

Monte Carlo simulation of γ and fission transfer-induced probabilities using extended 𝓡-matrix theory: Application to the ²³⁷U^∗ system