New 
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Febbraro, M.; deBoer, R. J.; Pain, S. D.; Toomey, Rebecca; Becchetti, F. D.; Boeltzig, A.; Chen, Y.; Chipps, K. A.; Couder, M.; Jones, K. L.; Lamere, Edward; Liu, Q.; Lyons, Stephanie; Macon, K. T.; Morales, Luis; Peters, William A.; Robertson, Daniel; Rasco, B.C.; Smith, K.; Seymour, C.; Seymour, G.; Smith, M. S.; Stech, E.; Kolk, B. Vande; Wiescher, M.

doi:10.1103/physrevlett.125.062501

Cited by 28 publications

(17 citation statements)

References 40 publications

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“…For example, Ref. [152] measured the 13 C(α, n) 16 O reaction using Notre Dame's 5 MV terminal voltage accelerated doubly-ionized He ++ atoms (5.2 MeV and 6.4 MeV) and a 13 C target, greatly benefiting neutron oscillation experiments and uncovering differences between previous measurements and evaluations. More measurements like this one are needed [153].…”

Section: (α N) Measurementsmentioning

confidence: 99%

Snowmass2021 Cosmic Frontier White Paper: Calibrations and backgrounds for dark matter direct detection

Baxter¹,

Bunker²,

Shaw³

et al. 2022

Preprint

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Future dark matter direct detection experiments will reach unprecedented levels of sensitivity. Achieving this sensitivity will require more precise models of signal and background rates in future detectors. Improving the precision of signal and background modeling goes hand-in-hand with novel calibration techniques that can probe rare processes and lower threshold detector response. The goal of this white paper is to outline community needs to meet the background and calibration requirements of nextgeneration dark matter direct detection experiments.

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Section: (α N) Measurementsmentioning

confidence: 99%

Snowmass2021 Cosmic Frontier White Paper: Calibrations and backgrounds for dark matter direct detection

Baxter¹,

Bunker²,

Shaw³

et al. 2022

Preprint

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show abstract

“…At higher energies, overall uncertainties could be reduced to the level of 5%. • Recent measurements at high energy are due to Febbraro et al (2020), covering the same energy range spanned by Harissopulos. They improved the precision and accuracy by means of a setup sensitive to the neutron energies, also measuring the excited state transitions via secondary c-ray detection.…”

Section: State-of-the-artmentioning

confidence: 99%

The Study of Key Reactions Shaping the Post-Main Sequence Evolution of Massive Stars in Underground Facilities

Ferraro

Ciani

Boeltzig

et al. 2021

Front. Astron. Space Sci.

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The chemical evolution of the Universe and several phases of stellar life are regulated by minute nuclear reactions. The key point for each of these reactions is the value of cross-sections at the energies at which they take place in stellar environments. Direct cross-section measurements are mainly hampered by the very low counting rate and by cosmic background; nevertheless, they have become possible by combining the best experimental techniques with the cosmic silence of an underground laboratory. In the nineties, the LUNA (Laboratory for Underground Nuclear Astrophysics) collaboration opened the era of underground nuclear astrophysics, installing first a homemade 50 kV and, later on, a second 400 kV accelerator under the Gran Sasso mountain in Italy: in 25 years of experimental activity, important reactions responsible for hydrogen burning could have been studied down to the relevant energies thanks to the high current proton and helium beams provided by the machines. The interest in the next and warmer stages of star evolution (i.e., post-main sequence and helium and carbon burning) drove a new project based on an ion accelerator in the MV range called LUNA-MV, able to deliver proton, helium, and carbon beams. The present contribution is aimed to discuss the state of the art for some selected key processes of post-main sequence stellar phases: 12C(α,γ)16O and 12C+12C are fundamental for helium and carbon burning phases, and 13C(α,n)16O and 22Ne(α,n)25Mg are relevant to the synthesis of heavy elements in AGB stars. The perspectives opened by an underground MV facility will be highlighted.

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“…Figure 5 shows the discrepancy up to 30% between measured cross section of Bair and Harissopulos. Above 5 MeV, where the 13 C(α,n1) 16 O channel opens up, it is well known (e.g., [Peters 2017], [Febbraro 2020]) that the Harissopulos result is incorrect by up to a factor of two because that experiment could not distinguish between neutrons from the (α,n0) and (α,n1) channels, which have a very different detection efficiency.…”

Section: Carbonmentioning

confidence: 99%

“…Those isotopes, which collectively contribute 70 alpha emission energies above 6.5 MeV (the current upper limit included in SOURCES 4C). The 13 C(a,n) reaction is one example of a critical background in neutrino experiments (e.g., [Febbraro 2020] and references therein). In addition to the total neutron yield, the neutron energy spectra are also important for such low-background experiments because they can result in an energy-dependent background that can introduce significant difficulties on the interpretation of the experimental results.…”

Section: Background Calculations For Low-background Measurementsmentioning

confidence: 99%

(α,n) nuclear data scoping study

Smith

Brown

Romano

et al. 2020

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Neutrons from the (a,n) reaction are an important component of nondestructive assay techniques to determine enriched uranium and other actinide inventories in a variety of critical points in the nuclear fuel cycle. However, uncertainties in the cross section, total neutron yield and neutron spectrum, and gamma emissions from these reactions, such as 19 F(a,n) and 17,18 O(a,n), introduce large uncertainties in the determination of mass of actinides of interest and can represent several significant quantities in unaccounted material in certain facility processes. Calculations and measurements depend on accurate nuclear data; however, much of the relevant data in use today was measured in the 1980s and earlier and has not been updated. Thus, the current uncertainties in the cross sections and neutron emission spectra are unacceptably large. This report documents the results of a scoping study of (α,n) reaction data that considered the current state of the data and recommends areas of improvement. It also addresses the codes use to calculate the (a,n) neutron and gamma source terms and recommends code improvements to support required analysis.

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New C13(α,n)O

Cited by 28 publications

References 40 publications

Snowmass2021 Cosmic Frontier White Paper: Calibrations and backgrounds for dark matter direct detection

Snowmass2021 Cosmic Frontier White Paper: Calibrations and backgrounds for dark matter direct detection

The Study of Key Reactions Shaping the Post-Main Sequence Evolution of Massive Stars in Underground Facilities

(α,n) nuclear data scoping study

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