Fission of Odd-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi></mml:math>Uranium and Plutonium Isotopes Excited by (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi><mml:mo>,</mml:mo><mml:mi>p</mml:mi></mml:math>), (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mo>,</mml:mo><mml:mi>d</mml:mi></mml:math>), and (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" dis

Britt, H. C.; Cramer, J.D.

doi:10.1103/physrevc.2.1758

Cited by 49 publications

(38 citation statements)

References 10 publications

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“…This leads to a background of "sterile" protons that contaminates the singles proton spectrum. This phenomenon was already observed by Britt and Cramer [8] and a theoretical investigation was initiated [9]. It is interesting to note that the fission probability obtained by Britt and Cramer for the 238 U(d,p) reaction is about two times smaller than the one obtained in this work.…”

Section: Preliminary Resultscontrasting

confidence: 39%

Neutron-induced cross sections of actinides via the surrogate-reaction method

Ducasse

Jurado

Aïche

et al. 2013

EPJ Web of Conferences

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Abstract. The surrogate-reaction method is an indirect way of determining cross sections for reactions that proceed through a compound nucleus. This technique may enable neutron-induced cross sections to be extracted for short-lived nuclei that otherwise cannot be measured. However, the validity of the surrogate method for extracting capture cross sections has to be investigated. In this work we study the reactions 238 U(d,p) 239 U, 238 U( 3 He,t) 238 Np, 238 U( 3 He, 4 He) 237 U as surrogates for neutroninduced reactions on 238 U, 237 Np and 236 U, respectively, for which good quality data exist. The experimental set-up enabled the measurement of fission and gamma-decay probabilities. First results are presented and discussed.

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Section: Preliminary Resultscontrasting

confidence: 39%

Neutron-induced cross sections of actinides via the surrogate-reaction method

Ducasse

Jurado

Aïche

et al. 2013

EPJ Web of Conferences

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“…Absorption band depth is another commonly measured spectral band parameter, which represents the percentage decrease in reflectance of an absorption relative to the isolated continuum (e.g., band depth (%)=1 -X =Y, where X is the relative reflectance value of the minimum reflectance of the absorption band and Y is the continuum-removed absorption band depth represented as a percentage). Band depths are not diagnostic of mineralogy and can vary based on the asteroid's phase angle during observations, space weathering on an asteroid's surface, or a surface metal component (Britt & Pieters 1988;Blewett et al 2015;Cloutis et al 1990Cloutis et al , 2015Sanchez et al 2014). Our analysis of band parameters utilizes a set of MATLAB routines (Reddy et al 2012a) and the IDL-based Spectral Analysis Routine for Asteroids (SARA) (Lindsay et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Hardersen

Reddy

Cloutis

et al. 2018

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Investigations of the main asteroid belt and efforts to constrain that population's physical characteristics involve the daunting task of studying hundreds of thousands of small bodies. Taxonomic systems are routinely employed to study the large-scale nature of the asteroid belt because they utilize common observational parameters, but asteroid taxonomies only define broadly observable properties and are not compositionally diagnostic. This work builds upon the results of work by Hardersen et al., which has the goal of constraining the abundance and distribution of basaltic asteroids throughout the main asteroid belt. We report on the near-infrared (NIR: 0.7 to 2.5 μm) reflectance spectra, surface mineralogical characterizations, analysis of spectral band parameters, and meteorite analogs for 33 V p asteroids. NIR reflectance spectroscopy is an effective remote sensing technique to detect most pyroxene group minerals, which are spectrally distinct with two very broad spectral absorptions at ∼0.9 and ∼1.9 μm. Combined with the results from Hardersen et al., we identify basaltic asteroids for ∼95% (39/41) of our inner-belt V p sample, but only ∼25% (2/8) of the outer-belt V p sample. Inner-belt basaltic asteroids are most likely associated with (4) Vesta and represent impact fragments ejected from previous collisions. Outerbelt V p asteroids exhibit disparate spectral, mineralogical, and meteorite analog characteristics and likely originate from diverse parent bodies. The discovery of two additional likely basaltic asteroids provides additional evidence for an outer-belt basaltic asteroid population.

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“…However, spin-parity entrance population distribution calculations remain a genuine challenge that needs special attention in future developments of Present (3He,4He fission) using Thompson deformed Present (3He,4He gamma) using Thompson deformed Present (t,pf) AVXSF simulation using Back (1974) S N Figure 5. 237 U * fission (solid curves) and γ (dashed curve) surrogate-like probabilities computed with AVX SF and compared with preliminary 238 U( 3 He, 4 He) 237 U * surrogate data (circles) from P. Marini, B. Jurado et al [12] and (t,pf) data (diamonds) from Britt and Cramer [16].…”

Section: Summary and Perspectivesmentioning

confidence: 99%

“…2. Present strong damping strength choice is based on little evidence of wide fluctuations both in (t,p) and (d,p) fission decay measurements [16] as well as in the presently analyzed 238 U( 3 He, 4 He) 237 U * measurement. We emphasize that incompletely damped vibrational approach [11] is frequently requested for eveneven fissioning nuclides whose giant resonance patterns are mainly correlated to a sparser discrete transition state sequence on barrier tops.…”

Section: Monte Carlo Reaction Decay Probabilitiesmentioning

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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Fission of Odd-AUranium and Plutonium Isotopes Excited by (d,p), (t,d), and (

Cited by 49 publications

References 10 publications

Neutron-induced cross sections of actinides via the surrogate-reaction method

Neutron-induced cross sections of actinides via the surrogate-reaction method

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

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

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Fission of Odd-AUranium and Plutonium Isotopes Excited by (d,p), (t,d), and (

Cited by 49 publications

References 10 publications

Neutron-induced cross sections of actinides via the surrogate-reaction method

Neutron-induced cross sections of actinides via the surrogate-reaction method

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 Vp-type Asteroids

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

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Product

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Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

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