Neutron spectrum from the T+T reaction

Wong, C.; Anderson, J. D.; McClure, J.W.

doi:10.1016/0029-5582(65)90040-4

Cited by 34 publications

(38 citation statements)

References 11 publications

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“…Experimental measurements were used to determine the relative amplitudes of the resonant contributions. [3] Unlike the R-matrix data, the data in the ENDF database gives values forF Er that vary with E r . Therefore, both (19) and (20) affect the shape of the spectrum.…”

Section: The Neutron Spectrummentioning

confidence: 99%

“…This has been the focus of much research. Experiments using an accelerator suggested that at a reaction energy of 250 keV the relative strengths of the different channels were 0.7, 0.2 and 0.1 for the dineutron, 5 He (GS) and 5 He (ES), respectively, [3] while experiments at a reaction energy of 110 keV suggested that the relative strengths to two significant figures were 0.95, 0.05 and 0.00. [4] More recently, the TT reaction has investigated using laserdriven spherical capsule implosion experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Only limited experimental data on the isotropy of emission of particles in the CM frame exists. [3] However, the significance of (14) is that, even if the CM frame spectrum contains anisotropic features, the thermal broadening does not depend on angular variations in the CM frame spectrum but only on the angular-averaged spectrum. Therefore, anisotropic emission in the CM frame or effects such as the angular correlation of primary and secondary neutrons emitted by the 5 He (GS) [2] cannot be observed by varying the temperature of a reacting plasma.…”

Section: Introductionmentioning

confidence: 99%

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The effects of ion temperature on the energy spectra of T + T → 2n + α reaction products

Appelbe

Chittenden

2016

High Energy Density Physics

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The effects of ion temperature on the energy spectra of products of the T + T → 2n + α reaction are modeled and analysed. A model is derived by assuming that the spectra in the centre of mass (CM) frame for a given reaction energy are known. The model is then applied to two different sets of data for the energy spectra in the CM frame. In both cases, it is shown that varying the ion temperature causes significant changes in the shapes of the n and α spectra. For the n spectrum, the apparent intensity of sequential decay through the ground state of 5 He decreases with increasing temperature. For the α spectrum, the sharp edge in the CM frame spectrum near 3.75 MeV caused by the dineutron reaction channel results in a thermally broadened spectrum with a high-energy tail at energies > 4 MeV . Knowledge of such features may help to interpret data from experiments designed to investigate the T + T reaction at low reaction energies.

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Section: The Neutron Spectrummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effects of ion temperature on the energy spectra of T + T → 2n + α reaction products

Appelbe

Chittenden

2016

High Energy Density Physics

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“…Similarly, those for the singlet n − n and p − p resonances were taken from a charge-independent analysis of N + N scattering. The R-matrix amplitudes were first adjusted by hand to fit the t + t spectra of Wong et al [2], as shown in Fig. 2.…”

Section: Applications To a = 6 Spectramentioning

confidence: 99%

Resonance model for the three-body states of the A=6 reactions

Paris

Hale

2016

EPJ Web of Conferences

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Abstract. We present an R-matrix-based model for three-body final states that has aspects of the Faddeev approach to three-particle scattering. The model is applied to describing the nucleon spectra for breakup reactions in the A = 6 systems. Calculations using a charge-symmetric parametrization agree fairly well with the experimental data, although they indicate larger contributions from the 5 He or 5 Li ground state are necessary.

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“…3) The relative similarity of the neutron spectrum from the T-T reaction (Wong et al 1965) and AmBe sources (Guarrini and Malaroda 1971) offers an opportunity for potentially greater log data convergence. However, the T-T neutron production cross section is 100X lower compared to that of the D-T reaction.…”

Section: Differences Between Chemical (Isotopic) and Electronic (Accementioning

confidence: 99%

Evaluation of Non-Nuclear Techniques for Well Logging: Technology Evaluation

Bond¹,

Denslow²,

Griffin³

et al. 2010

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Sealed, chemical isotope radiation sources have a diverse range of industrial applications. There is concern that such sources currently used in the gas/oil well logging industry (e.g., americium-beryllium [AmBe], 252 Cf, 60 Co, and 137 Cs) can potentially be diverted and used in dirty bombs. Recent actions by the U.S. Department of Energy (DOE) have reduced the availability of these sources in the United States. Alternatives, both radiological and non-radiological methods, are actively being sought within the oilfield services community. The use of isotopic sources can potentially be further reduced, and source use reduction made more acceptable to the user community, if suitable non-nuclear or non-isotope-based well logging techniques can be developed. Data acquired with these non-nuclear techniques must be demonstrated to correlate with that acquired using isotope sources and historic records. To enable isotopic source reduction there is a need to assess technologies to determine (i) if it is technically feasible to replace isotopic sources with alternate sensing technologies and (ii) to provide independent technical data to guide DOE (and the Nuclear Regulatory Commission [NRC]) on issues relating to replacement and/or reduction of radioactive sources used in well logging.This report presents an initial review of the state-of-the-art nuclear and non-nuclear well logging methods and seeks to understand the technical and economic issues if AmBe, and potentially other isotope sources, are reduced or even eliminated in the oil-field services industry. Prior to considering alternative logging technologies, there is a definite need to open up discussions with industry regarding the feasibility and acceptability of source replacement. Industry views appear to range from those who see AmBe as vital and irreplaceable to those who believe that, with research and investment, it may be possible -to transition to electronic neutron sources and employ combinations of non-nuclear technologies to acquire the desired petro-physical parameters. In one sense, the simple answer to the question as to whether petro-physical parameters can be sensed with technologies other than AmBe is probably "Yes". The challenges come when attention turns to record interpretation. The many decades of existing records form a very valuable proprietary resource, and the interpretation of subtle features contained in these records are of significant value to the oil-gas exploration community to correctly characterize a well. The demonstration of equivalence and correspondence/correlation between established and any new sensing modality, and correlations with historic records is critical to ensuring accurate data interpretation. Establishing the technical basis for such a demonstration represents a significant effort.The focus of this study is the understanding of the technical obstacles that hinder the replacement of and the disadvantages from the loss of extensive interpretation experience based on data accumulated with AmBe. Enhanced ac...

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Neutron spectrum from the T+T reaction

Cited by 34 publications

References 11 publications

The effects of ion temperature on the energy spectra of T + T → 2n + α reaction products

The effects of ion temperature on the energy spectra of T + T → 2n + α reaction products

Resonance model for the three-body states of the A=6 reactions

Evaluation of Non-Nuclear Techniques for Well Logging: Technology Evaluation

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