Short analysis of cosmogenic production of radioactive isotopes in argon as target for the next neutrino experiments

Parvu, M.; Chiriacescu, A.; Lazanu, I.

doi:10.1016/j.radphyschem.2018.08.009

Cited by 10 publications

(7 citation statements)

References 50 publications

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“…The existence of different impurities in argon put in evidence the differences in the emission spectra of liquid and gaseous phases [36,37]. In LAr, the spectrum is dominated by an emission feature of 126.8 nm or 9.78 keV equivalent value analogues to the 2nd excimer continuum in the gas phase [38], confirming the previous results of Doke [34]. Weak-emission features in the wavelength range from 145 to 300 nm were observed.…”

Section: Jcap10(2020)046 3 Production Of Scintillation Light In Liqui...supporting

confidence: 80%

About detecting very low mass black holes in LAr detectors

Lazanu¹,

Lazanu²,

Parvu³

2020

J. Cosmol. Astropart. Phys.

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The nature of dark matter is still an open problem. The simplest assumption is that gravity is the only force certainly coupled to dark matter and thus the micro black holes could be a viable candidate. We investigated the possibility of direct detection of charged micro black holes with masses around and upward the Planck scale (10 −5 g), ensuring a classical gravitational treatment of these objects in the next generation huge LAr detectors. We show that the signals (ionization and scintillation) produced in LAr enable the discrimination between micro black holes and other particles. It is expected that the trajectories of these micro black holes will appear as crossing the whole active medium, in any direction, producing uniform ionization and scintillation on the whole path.

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Section: Jcap10(2020)046 3 Production Of Scintillation Light In Liqui...supporting

confidence: 80%

About detecting very low mass black holes in LAr detectors

Lazanu¹,

Lazanu²,

Parvu³

2020

J. Cosmol. Astropart. Phys.

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“…The existence of different impurities in argon put in evidence the differences in the emission spectra of liquid and gaseous phases [28,29]. In LAr, the spectrum is dominated by an emission feature 126.8 nm or 9.78 keV equivalent value analogues to the 2nd excimer continuum in the gas phase [31], confirming the previous results of Doke [27]. Weak-emission features in the wavelength range from 145 to 300 nm were observed.…”

Section: Production Of Scintillation Light In Liquid Argonsupporting

confidence: 80%

About detecting very low mass black holes in LAr detectors

Lazanu,

Pârvu

2020

Preprint

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The nature of dark matter is still an open problem. The simplest assumption is that gravity is the only force coupled certainly to dark matter and thus the micro black holes could be a viable candidate. We investigated the possibility of direct detection of micro black holes with masses around and upward the Planck scale (10 −5 g), ensuring classical gravitational treatment of these objects in the next generation of huge LAr detectors. We show that the signals (ionization and scintillations) produced in LAr enable the discrimination between micro black holes or other particles. It is expected that the trajectories of these micro black holes will appear as crossing the whole active medium, in any direction, producing uniform ionization and scintillation on all the path.

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“…where R 0 = (484 ± 71) µ − /(kg Ar day) is the rate of stopped muons at sea-level [73] and we have added a 10% uncertainty to account for the 10% difference in the (Z/A) value for argon compared to air, λ c ( 40 Ar) = (1.20 ± 0.08) × 10 6 /sec is the capture rate of muons on argon [74], λ d = 4.552 × 10 5 /sec is the decay rate of muons [75], and f * ( 39 Cl) = 0.490 ± 0.014 is the effective probability of producing 39 Cl or 39 S [76,77]. The sealevel production rate from muon captures is therefore estimated to be (172 ± 26) atoms/(kg Ar day).…”

Section: CLmentioning

confidence: 99%

Cosmogenic production of Ar39 and Ar37 in argon

et al. 2019

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We have experimentally determined the production rate of 39 Ar and 37 Ar due to cosmic ray neutron interactions in argon at sea level. Understanding these production rates is important for argon-based dark matter experiments that plan to utilize argon extracted from deep underground because it is imperative to know what the ingrowth of 39 Ar will be during the production, transport, and storage of the underground argon. These measurements also allow for the prediction of 39 Ar and 37 Ar concentrations in the atmosphere which can be used to determine the presence of other sources of these isotopes. Through controlled irradiation with a neutron beam that mimics the cosmic ray neutron spectrum, followed by direct counting of 39 Ar and 37 Ar decays with sensitive ultra-low background proportional counters, we determined that the production rate from cosmic ray neutrons at sea-level is expected to be (759 ± 128) atoms/(kg Ar day) for 39 Ar, and (51.0 ± 7.4) atoms/(kg Ar day) for 37 Ar. We also performed a survey of the alternate production mechanisms based on the state-of-knowledge of the associated cross-sections to obtain a total sea-level cosmic ray production rate of (1048 ± 133) atoms/(kg Ar day) for 39 Ar, (56.7 ± 7.5) atoms/(kg Ar day) for 37 Ar in underground argon, and (92 ± 13) atoms/(kg Ar day) for 37 Ar in atmospheric argon.

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Short analysis of cosmogenic production of radioactive isotopes in argon as target for the next neutrino experiments

Cited by 10 publications

References 50 publications

About detecting very low mass black holes in LAr detectors

About detecting very low mass black holes in LAr detectors

About detecting very low mass black holes in LAr detectors

Cosmogenic production of Ar39 and Ar37 in argon

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