Thick-target measurements and astrophysical thermonuclear reaction rates: Alpha-induced reactions

Roughton, N. A.; Intrator, T.; Peterson, R. J.; Zaidins, C.S.; Hansen, Carl J.

doi:10.1016/0092-640x(83)90021-9

Cited by 32 publications

(44 citation statements)

References 7 publications

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“…Therefore, thick-target yield curves are not considered in this work. One exception is made for the data by Roughton et al [49] because these data allow to include the doubly-magic nucleus 48 Ca in this study. Roughton et al have measured thick-target yield curves for 36 nuclear reactions in relatively small energy steps.…”

Section: (Infinitely) Thick-target Yieldsmentioning

confidence: 99%

Cross sections of α-induced reactions for targets with masses A ≈ 20–50 at low energies

Mohr

2015

Eur. Phys. J. A

100

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Abstract. A simple reduction scheme using so-called reduced energies E red and reduced cross sections σ red allows the comparison of heavy-ion induced reaction cross sections for a broad range of masses of projectile and target and over a wide energy range. A global behavior has been found for strongly bound projectiles whereas much larger reduced cross sections have been observed for weakly bound and halo projectiles. It has been shown that this simple reduction scheme works also well for α-particle induced reactions on heavy target nuclei, but very recently significant deviations have been seen for α+ 33 S and α+ 23 Na. Motivated by these unexpected discrepancies, the present study analyses α-induced reaction cross sections for targets with masses A ≈ 20 − 50. The study shows that the experimental data for α-induced reactions on nuclei with A ≈ 20 − 50 deviate slightly from the global behavior of reduced cross sections. However, in general the deviations evolve smoothly towards lower masses. The only significant outliers are the recent data for 33 S and 23 Na which are far above the general systematics, and some very old data may indicate that 36 Ar and 40 Ar are below the general trend. As expected, also the doubly-magic 40 Ca nucleus lies slightly below the results for its neighboring nuclei. Overall, the experimental data are nicely reproduced by a statistical model calculation utilizing the simple α-nucleus potential by McFadden and Satchler. Simultaneously with the deviation of reduced cross sections σ red from the general behavior, the outliers 23 Na, 33 S, 36 Ar, and 40 Ar also show significant disagreement between experiment and statistical model calculation.PACS. 25.55.-e 3H-, 3He-, and 4He-induced reactions -24.10.Pa Thermal and statistical models

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Section: (Infinitely) Thick-target Yieldsmentioning

confidence: 99%

Cross sections of α-induced reactions for targets with masses A ≈ 20–50 at low energies

Mohr

2015

Eur. Phys. J. A

100

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“…The results of the most recent models seem to be roughly comparable. As far as experiment is concerned, we can also only cite a sampling of the many papers from a variety of sources, including Caltech (Zyskind et al, 1977), the University of Colorado (Roughton et al, 1979, Roughton et al, 1983, and the University of Melbourne (Sargood, 1982). Figure 13 shows an example of a phenomenon that Fowler and Caltech colleagues have named competition cusps.…”

Section: E Silicon Burningmentioning

confidence: 99%

Synthesis of the elements in stars: forty years of progress

et al. 1997

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Forty years ago Burbidge, Burbidge, Fowler, and Hoyle combined what we would now call fragmentary evidence from nuclear physics, stellar evolution and the abundances of elements and isotopes in the solar system as well as a few stars into a synthesis of remarkable ingenuity. Their review provided a foundation for forty years of research in all of the aspects of low energy nuclear experiments and theory, stellar modeling over a wide range of mass and composition, and abundance studies of many hundreds of stars, many of which have shown distinct evidence of the processes suggested by B 2 FH. In this review we summarize progress in each of these fields with emphasis on the most recent developments. [S0034-6861(97)

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“…To validate this code, we compare the neutron yields computed by NeuCBOT with various measurements reported by [6,7,8,9] and calculations done using SOURCES-4C [1]. For SOURCES-4C calculations, data not included in the default SOURCES-4C libraries were added from either JENDL [10] or the EMPIRE code [11], as discussed in [2].…”

Section: # Example Semi-heavy Watermentioning

confidence: 99%

“…The straight black line indicates perfect agreement. Solid dots represent measurements presented in [6], squares in [8], upward triangles in [9], and hollow circles in [7]; downward triangles are SOURCES-4C [1] calculations. Reference yields reported per isotope were compared to NeuCBOT calculations for that isotope; references yields reported per element were compared to NeuCBOT assuming natural abundances; SOURCES-4C comparisons were done at natural abundances.…”

Section: # Example Semi-heavy Watermentioning

confidence: 99%

A new tool for (α,n) yield calculations and its implications for DEAP-3600

Westerdale¹

2018

AIP Conference Proceedings

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Abstract. Neutron-induced nuclear recoils present one of the dominant backgrounds in many low-background experiments. These neutrons are largely radiogenic in origin, coming from fission and (α, n) reactions in detector components. The (α, n) neutron production rate in a material depends on its composition and the energies of the α decays inside of it. We present NeuCBOT, the Neutron Calculator Based on TALYS, a new tool for calculating the (α, n) yields and neutron energy spectra for materials exposed to a given set of α energies or α-emitting isotopes. We benchmark these calculations against measured yields and SOURCES-4C calculations. We discuss these yield calculations in the context of DEAP-3600, a Weakly Interactive Massive Particle dark matter detector at SNOLAB. Using NeuCBOT and Geant4 simulations, we predict the neutron-induced nuclear recoil background in DEAP-3600. We then present in-situ constraints on the neutron background rate in DEAP-3600, consistent with our prediction.

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Thick-target measurements and astrophysical thermonuclear reaction rates: Alpha-induced reactions

Cited by 32 publications

References 7 publications

Cross sections of α-induced reactions for targets with masses A ≈ 20–50 at low energies

Cross sections of α-induced reactions for targets with masses A ≈ 20–50 at low energies

Synthesis of the elements in stars: forty years of progress

A new tool for (α,n) yield calculations and its implications for DEAP-3600

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