SOURCES 4A: A Code for Calculating (alpha,n), Spontaneous Fission, and Delayed Neutron Sources and Spectra

Madland, D.G.; Arthur, E.D.; Estes, G.P.; Stewart, J.E.; Bozoian, M.; Perry, R.T.; Parish, T.A.; Brown, Thomas H.; England, T.R.; Wilson, W.B.; Charlton, William

doi:10.2172/15215

Cited by 16 publications

(16 citation statements)

References 3 publications

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“…Lastly, the two neutron sources are characterized by the energy spectrum of a PuBe isotopic neutron source [7]. The sources' geometries are defined by an outer stainless-steel container, an inner tantalum cladding, and the plutonium beryllium mixture with the composition given by the manufacturer.…”

Section: Methodsmentioning

confidence: 99%

DEVELOPMENT OF AN MCNP MODEL OF A BORON-10 ZINC SULFIDE SILVER-ACTIVATED [ ¹⁰ B/ZnS(Ag)] DETECTOR AND DIRECTIONAL SHIELDING USING RADIATION COUNTING

Macris¹,

McKay²,

Charlton³

et al. 2021

RAD Conference Proceedings

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For radiological neutron surveying, neutron detectors require shielding to minimize contributions from sources outside the area of interest. To test the effectiveness of such a shield, Monte Carlo N-Particle Transport Codes (MCNP) were used to model a neutron detector so that the effectiveness of such a shield design could be explored. In this research, MCNP models of a 10 B/ZnS detector within a shield were developed and compared to experimental results. By carefully modeling the specifics of the neutron detector as well as the neutron source used in the experiments, the simulation was able to accurately predict the experimental results within 20%.

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Section: Methodsmentioning

confidence: 99%

DEVELOPMENT OF AN MCNP MODEL OF A BORON-10 ZINC SULFIDE SILVER-ACTIVATED [ ¹⁰ B/ZnS(Ag)] DETECTOR AND DIRECTIONAL SHIELDING USING RADIATION COUNTING

Macris¹,

McKay²,

Charlton³

et al. 2021

RAD Conference Proceedings

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“…We use the SOURCES-4A code [123] to calculate the neutron spectra from SF of all nuclei in the 238 U decay chain and (α, n) reactions induced by α-particles from the 238 U decay chain. From these spectra, we calculate the induced nuclear recoil spectra using the neutron-nucleon cross sections tabulated in the JANIS4.0 database [124].…”

Section: Neutronsmentioning

confidence: 99%

Paleo-detectors: Searching for dark matter with ancient minerals

et al. 2019

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We explore paleo-detectors as an approach to the direct detection of Weakly Interacting Massive Particle (WIMP) dark matter radically different from conventional detectors. Instead of instrumenting a (large) target mass in a laboratory in order to observe WIMP-induced nuclear recoils in real time, the approach is to examine ancient minerals for traces of WIMP-nucleus interactions recorded over timescales as large as 1 Gyr. Here, we discuss the paleo-detector proposal in detail, including background sources and possible target materials. In order to suppress backgrounds induced by radioactive contaminants such as uranium, we propose to use minerals found in marine evaporites or in ultra-basic rocks. We estimate the sensitivity of paleo-detectors to spin-independent and spin-dependent WIMP-nucleus interactions. The sensitivity to low-mass WIMPs with masses mχ 10 GeV extends to WIMP-nucleon cross sections many orders of magnitude smaller than current upper limits. For heavier WIMPs with masses mχ 30 GeV cross sections a factor of a few to ∼ 100 smaller than current upper limits can be probed by paleo-detectors.

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“…Importantly, the mean free path of MeV neutrons in typical minerals is a few cm, hence, the multiple tracks produced by the interactions of any particular neutron cannot be correlated with each other. As in previous work, we use SOURCES-4A [114] to calculate the neutron spectrum from spontaneous fission and (α, n)reactions, taking into account contributions from the entire 238 U decay chain. We then use our own Monte Carlo simulation [24,25] to compute the associated nuclear recoil (and, in turn, track length) spectrum based on neutron-nucleus cross sections tabulated in the JANIS4.0 database [115].…”

Section: Events/binmentioning

confidence: 99%

Galactic Geology: Probing Time-Varying Dark Matter Signals with Paleo-Detectors

Baum,

DeRocco,

Edwards

et al. 2021

Preprint

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Paleo-detectors are a proposed experimental technique to search for dark matter by reading out the damage tracks caused by nuclear recoils in small samples of natural minerals. Unlike a conventional real-time direct detection experiment, paleo-detectors have been accumulating these tracks for up to a billion years. These long integration times offer a unique possibility: by reading out paleodetectors of different ages, one can explore the time-variation of signals on megayear to gigayear timescales. We investigate two examples of dark matter substructure that could give rise to such time-varying signals. First, a dark disk through which the Earth would pass every ∼45 Myr, and second, a dark matter subhalo that the Earth encountered during the past gigayear. We demonstrate that paleo-detectors are sensitive to these examples under a wide variety of experimental scenarios, even in the presence of substantial background uncertainties. This paper shows that paleo-detectors may hold the key to unraveling our Galactic history.

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SOURCES 4A: A Code for Calculating (alpha,n), Spontaneous Fission, and Delayed Neutron Sources and Spectra

Cited by 16 publications

References 3 publications

DEVELOPMENT OF AN MCNP MODEL OF A BORON-10 ZINC SULFIDE SILVER-ACTIVATED [ ¹⁰ B/ZnS(Ag)] DETECTOR AND DIRECTIONAL SHIELDING USING RADIATION COUNTING

DEVELOPMENT OF AN MCNP MODEL OF A BORON-10 ZINC SULFIDE SILVER-ACTIVATED [ ¹⁰ B/ZnS(Ag)] DETECTOR AND DIRECTIONAL SHIELDING USING RADIATION COUNTING

Paleo-detectors: Searching for dark matter with ancient minerals

Galactic Geology: Probing Time-Varying Dark Matter Signals with Paleo-Detectors

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SOURCES 4A: A Code for Calculating (alpha,n), Spontaneous Fission, and Delayed Neutron Sources and Spectra

Cited by 16 publications

References 3 publications

DEVELOPMENT OF AN MCNP MODEL OF A BORON-10 ZINC SULFIDE SILVER-ACTIVATED [ 10 B/ZnS(Ag)] DETECTOR AND DIRECTIONAL SHIELDING USING RADIATION COUNTING

DEVELOPMENT OF AN MCNP MODEL OF A BORON-10 ZINC SULFIDE SILVER-ACTIVATED [ 10 B/ZnS(Ag)] DETECTOR AND DIRECTIONAL SHIELDING USING RADIATION COUNTING

Paleo-detectors: Searching for dark matter with ancient minerals

Galactic Geology: Probing Time-Varying Dark Matter Signals with Paleo-Detectors

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Product

Resources

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DEVELOPMENT OF AN MCNP MODEL OF A BORON-10 ZINC SULFIDE SILVER-ACTIVATED [ ¹⁰ B/ZnS(Ag)] DETECTOR AND DIRECTIONAL SHIELDING USING RADIATION COUNTING

DEVELOPMENT OF AN MCNP MODEL OF A BORON-10 ZINC SULFIDE SILVER-ACTIVATED [ ¹⁰ B/ZnS(Ag)] DETECTOR AND DIRECTIONAL SHIELDING USING RADIATION COUNTING