Search for boosted dark matter in COSINE-100

We search for energetic electron recoil signals induced by boosted dark matter (BDM) from the galactic center using the COSINE-100 array of NaI(Tl) crystal detectors at the Yangyang Underground Laboratory. The signal would be an excess of events with energies above 4 MeV over the well-understood background. Because no excess of events are observed in a 97.7 kg·yr exposure, we set limits on BDM interactions under a variety of hypotheses. Notably, we explored the dark photon parameter space, leading to competitive limits compared to direct dark photon search experiments, particularly for dark photon masses below 4 MeV and considering the invisible decay mode. Furthermore, by comparing our results with a previous BDM search conducted by the Super-Kamionkande experiment, we found that the COSINE-100 detector has advantages in searching for low-mass dark matter. This analysis demonstrates the potential of the COSINE-100 detector to search for MeV electron recoil signals produced by the dark sector particle interactions

Search for bosonic super-weakly interacting massive particles at COSINE-100

We present results of a search for bosonic super-weakly interacting massive particles (BSW) as keV scale dark matter candidates that is based on an exposure of 97.7 kg·year from the COSINE experiment. In this search, we employ, for the first time, Compton-like as well as absorption processes for pseudoscalar and vector BSWs. No evidence for BSWs is found in the mass range from 10 keV/c2 to 1 MeV/c2, and we present the exclusion limits on the dimensionless coupling constants to electrons gae for pseudoscalar and κ for vector BSWs at 90% confidence level. Our results show that these limits are improved by including the Compton-like process in masses of BSW, above O(100 keV/c2)

Search for inelastic WIMP-iodine scattering with COSINE-100

We report the results of a search for inelastic scattering of weakly interacting massive particles (WIMPs) off I127 nuclei using NaI(Tl) crystals with a data exposure of 97.7 kg·years from the COSINE-100 experiment. The signature of inelastic WIMP-I127 scattering is a nuclear recoil accompanied by a 57.6 keV γ-ray from the prompt deexcitation, producing a more energetic signal compared to the typical WIMP nuclear recoil signal. We found no evidence for this inelastic scattering signature and set a 90% confidence level upper limit on the WIMP-proton spin-dependent, inelastic scattering cross section of 1.2×10-37 cm2 at the WIMP mass 500 GeV/c2

An induced annual modulation signature in COSINE-100 data by DAMA/LIBRA’s analysis method

The DAMA/LIBRA collaboration has reported the observation of an annual modulation in the event rate that has been attributed to dark matter interactions over the last two decades. However, even though tremendous efforts to detect similar dark matter interactions were pursued, no definitive evidence has been observed to corroborate the DAMA/LIBRA signal. Many studies assuming various dark matter models have attempted to reconcile DAMA/LIBRA’s modulation signals and null results from other experiments, however no clear conclusion can be drawn. Apart from the dark matter hypothesis, several studies have examined the possibility that the modulation is induced by variations in detector’s environment or their specific analysis methods. In particular, a recent study presents a possible cause of the annual modulation from an analysis method adopted by the DAMA/LIBRA experiment in which the observed annual modulation could be reproduced by a slowly varying time-dependent background. Here, we study the COSINE-100 data using an analysis method similar to the one adopted by the DAMA/LIBRA experiment and observe a significant annual modulation, however the modulation phase is almost opposite to that of the DAMA/LIBRA data. Assuming the same background composition for COSINE-100 and DAMA/LIBRA, simulated experiments for the DAMA/LIBRA without dark matter signals also provide significant annual modulation with an amplitude similar to DAMA/LIBRA with opposite phase. Even though this observation does not directly explain the DAMA/LIBRA results directly, this interesting phenomenon motivates more profound studies of the time-dependent DAMA/LIBRA background data

Pilostyles coccoidea (Apodanthaceae), a new species from Western Australia described from morphological and molecular evidence

Pilostyles coccoidea K.R. Thiele, a new species of holoparasitic flowering plant found on the legume genus Jacksonia R.Br. ex Sm., is described and illustrated. The new species is related to P. collina Dell and P. hamiltonii C.A. Gardner, both also from south-western Western Australia but growing on different hosts. The three species differ in morphological features of flowers and fruits. In addition, analysis of nad1, 16S and matR gene sequences confirms the distinctness of P. coccoidea from P. hamiltonii. Pilostyles coccoidea appears to be a relatively common species within its restricted range of distribution between Eneabba and the Moore River, north of Pert

Geology of the Wellington district : a brief explanation of the geological map Sheet 311 Wellington

This Sheet Explanation provides a summary of the geology of the Wellington district, the area covered by 1:50 000 scale geological Sheet 311 (England and Wales). It also provides directions to further geological information about the district. The district includes parts of the counties of Somerset and Devon, within the local authority districts of Taunton Deane, South Somerset, Mid Devon and East Devon. The principal centres of population are the towns of Wellington and Chard, the southern outskirts of Taunton in the north and the western part of Ilminster in the east. Much of the district is occupied by the northern and central parts of the Blackdown Hills Area of Outstanding Natural Beauty (AONB), which was designated in 1991. The topography of the district is dominated by the Blackdown Hills (front cover), a dissected plateau that rises steeply to a maximum elevation of 315 m above Ordnance Datum south of the gently undulating Vale of Taunton Deane. In the northwest the ground rises to around 160 m. North and east of the Blackdown Hills complex, rivers such as the Isle and Tone flow north-westwards and west towards the Bristol Channel. Within the south of the Blackdown Hills, the rivers Culm, Axe, Otter and Yarty drain southwards towards the English Channel (Figure 1)

Geology of the Wellington district : a brief explanation of the geological map Sheet 311 Wellington

This Sheet Explanation provides a summary of the geology of the Wellington district, the area covered by 1:50 000 scale geological Sheet 311 (England and Wales). It also provides directions to further geological information about the district. The district includes parts of the counties of Somerset and Devon, within the local authority districts of Taunton Deane, South Somerset, Mid Devon and East Devon. The principal centres of population are the towns of Wellington and Chard, the southern outskirts of Taunton in the north and the western part of Ilminster in the east. Much of the district is occupied by the northern and central parts of the Blackdown Hills Area of Outstanding Natural Beauty (AONB), which was designated in 1991. The topography of the district is dominated by the Blackdown Hills (front cover), a dissected plateau that rises steeply to a maximum elevation of 315 m above Ordnance Datum south of the gently undulating Vale of Taunton Deane. In the northwest the ground rises to around 160 m. North and east of the Blackdown Hills complex, rivers such as the Isle and Tone flow north-westwards and west towards the Bristol Channel. Within the south of the Blackdown Hills, the rivers Culm, Axe, Otter and Yarty drain southwards towards the English Channel (Figure 1)

Search for solar bosonic dark matter annual modulation with COSINE-100

We present results from a search for solar bosonic dark matter using the annual modulation method with the COSINE-100 experiment. The results were interpreted considering three dark sector bosons models: solar dark photons, Dine-Fischler-Srednicki-Zhitnisky (DFSZ) and Kim-Shifman-Vainshtein-Zakharov (KSVZ) solar axions, and Kaluza-Klein solar axions. No modulation signal compatible with the expected from the models was found from a dataset of 2.82 yr, using 61.3 kg of NaI(Tl) crystals. Therefore, we set a 90% confidence level upper limits for each of the three models studied. For the solar dark photon model, the most stringent mixing parameter upper limit is 1.61×10-14 for dark photons with a mass of 215 eV. For the DFSZ and KSVZ solar axion, and the Kaluza-Klein axion models, the upper limits exclude axion-electron couplings, gae, above 1.61×10-11 for axion mass below 0.2 keV; and axion-photon couplings, gaγγ, above 1.83×10-11 GeV-1 for an axion number density of 4.07×1013 cm-3. This is the first experimental search for solar dark photons and DFSZ and KSVZ solar axions using the annual modulation method. The lower background, higher light yield and reduced threshold of NaI(Tl) crystals of the future COSINE-200 experiment are expected to enhance the sensitivity of the analysis shown in this paper. We show the sensitivities for the three models studied, considering the same search method with COSINE-200. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the https://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.11Nsciescopu

Argumentation in Foreign Policy Settings

This is a study of argumentation in three different kinds of high level, confidential, foreign policy settings: a collegial setting, a bureaucratic setting, and a bargaining setting. The causal and value assertions of the participants were coded using the detailed records of these three settings. The data show to be inadequate a defense/ attack model of argumentation in which the participants support their own arguments to make them resistant to attack, while attacking the weak spots in others'stated positions. In fact, there are few assertions which are supported by specific evidence, almost no mutually supported causal arguments, and the assertions which were attacked were no less emphasized than the assertions which were not attacked. More in accord with the data is the novel-arguments approach in which the key factor in persuasive argumentation is the development of arguments which others have not already taken into account.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67391/2/10.1177_002200277702100410.pd