skip to main content
Explore Scholarly Publications and Datasets in the NSF-PAR

  • Home
  • Search Results
  • Page 1 of 16

Search for: All records

Creators/Authors contains: "Clark, M."

Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher. Some full text articles may not yet be available without a charge during the embargo (administrative interval).
What is a DOI Number?

Some links on this page may take you to non-federal websites. Their policies may differ from this site.

  1. ; ; ; ; ; ; ( , Sedimentology)
    Brasier, Alexander (Ed.)
    Free, publicly-accessible full text available October 1, 2022
  2. ; ; ; ; ; ; ( , Journal of Instrumentation)
    Full Text Available 
  3. ; ; ; ; ; ; ; ; ; ; et al ( , Geophysical Research Letters)
    Free, publicly-accessible full text available September 28, 2022
  4. ; ; ; ; ( , Geochimica et Cosmochimica Acta)
    Full Text Available 
  5. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review C)
    Free, publicly-accessible full text available June 1, 2023
  6. ; ; ; ; ; ( , Palaeogeography, Palaeoclimatology, Palaeoecology)
    Full Text Available 
  7. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review C)
    Full Text Available 
  8. ; ; ; ; ; ; ; ; ; ; et al ( , The European Physical Journal C)
    Abstract The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, and $$^{222}$$ 222 Rn emanation measurements. Furthermore, the cleanliness procedures applied to remove or mitigate surface contamination of detector materials are described. Screening results, used as inputs for a XENONnT Monte Carlo simulation, predict a reduction of materials background ( $$\sim $$ ∼ 17%) with respect to its predecessor XENON1T. Through radon emanation measurements, the expected $$^{222}$$ 222more »Rn activity concentration in XENONnT is determined to be 4.2 ( $$^{+0.5}_{-0.7}$$ - 0.7 + 0.5 )  $$\upmu $$ μ Bq/kg, a factor three lower with respect to XENON1T. This radon concentration will be further suppressed by means of the novel radon distillation system.« less
    Free, publicly-accessible full text available July 1, 2023
  9. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
    Free, publicly-accessible full text available July 1, 2023
  10. ; ; ; ; ; ; ; ; ; ; et al ( , Progress of Theoretical and Experimental Physics)
    Abstract A novel online distillation technique was developed for the XENON1T dark matter experiment to reduce intrinsic background components more volatile than xenon, such as krypton or argon, while the detector was operating. The method is based on a continuous purification of the gaseous volume of the detector system using the XENON1T cryogenic distillation column. A krypton-in-xenon concentration of (360±60)ppq was achieved. It is the lowest concentration measured in the fiducial volume of an operating dark matter detector to date. A model was developed and fit to the data to describe the krypton evolution in the liquid and gas volumesmore »of the detector system for several operation modes over the time span of 550 days, including the commissioning and science runs of XENON1T. The online distillation was also successfully applied to remove 37Ar after its injection for a low energy calibration in XENON1T. This makes the usage of 37Ar as a regular calibration source possible in the future. The online distillation can be applied to next-generation LXe TPC experiments to remove krypton prior to, or during, any science run. The model developed here allows further optimization of the distillation strategy for future large scale detectors.« less
    Free, publicly-accessible full text available April 29, 2023