scholarly journals RECONCILING THE POSITIVE DAMA ANNUAL MODULATION SIGNAL WITH THE NEGATIVE RESULTS OF THE CDMS II EXPERIMENT

2004 ◽  
Vol 19 (24) ◽  
pp. 1841-1846 ◽  
Author(s):  
R. FOOT
Keyword(s):  
Dark Matter ◽  
Positive Result ◽  
Lower Threshold ◽  
Annual Modulation ◽  
Null Results ◽  
Negative Results ◽  
Modulation Signal ◽  
Decisive Test ◽  
Light Target ◽  
Mirror Matter

We examine the recent CDMS II results in the context of the mirror matter interpretation of the DAMA/NaI experiment. We find that the favoured mirror matter interpretation of the DAMA/NaI experiment — a He ′/ H ′-dominated halo with a small O ′ component is fully consistent with the null results reported by CDMS II. While the CDMS II experiment is quite sensitive to a heavy Fe ′ component, and may yet find a positive result, a more decisive test of mirror matter-type dark matter would require a lower threshold experiment using light target elements.

MIRROR DARK MATTER

2007 ◽  
Vol 22 (27) ◽  
pp. 4951-4957 ◽  
Author(s):  
R. FOOT
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
The Other ◽  
Simple Explanation ◽  
Annual Modulation ◽  
Null Results ◽  
The Status ◽  
Modulation Signal ◽  
The Universe

A mirror sector of particles and forces provides a simple explanation of the inferred dark matter of the Universe. The status of this theory is reviewed - with emphasis on how the theory explains the impressive DAMA/NaI annual modulation signal, whilst also being consistent with the null results of the other direct detection experiments.

scholarly journals First search for a dark matter annual modulation signal with NaI(Tl) in the Southern Hemisphere by DM-Ice17

2017 ◽  
Vol 95 (3) ◽  
Author(s):  
E. Barbosa de Souza ◽  
J. Cherwinka ◽  
A. Cole ◽  
A. C. Ezeribe ◽  
D. Grant ◽  
...  
Keyword(s):  
Dark Matter ◽  
Southern Hemisphere ◽  
Annual Modulation ◽  
Modulation Signal

scholarly journals Strong constraints from COSINE-100 on the DAMA dark matter results using the same sodium iodide target

2021 ◽  
Author(s):  
Govinda Adhikari ◽  
E. Barbosa de Souza ◽  
N. Carlin ◽  
J.J. Choi ◽  
S. Choi ◽  
...  
Keyword(s):  
Dark Matter ◽  
Sodium Iodide ◽  
Weakly Interacting Massive Particles ◽  
Dark Matter Halo ◽  
Annual Modulation ◽  
Interaction Hypothesis ◽  
Order Of Magnitude ◽  
Modulation Signal ◽  
Alternative Scenarios ◽  
First Time

Abstract It is a long-standing debate as to whether or not the annual modulation in the event rate observed by the DAMA sodium iodide experiment is caused by the interaction of dark matter particles. To resolve this issue, several groups have been working to develop new experiments with the aim of reproducing or refuting DAMA's results using the same sodium iodide target medium. The COSINE-100 experiment is one of these that is currently operating with 106 kg of low-background sodium iodide crystals at the Yangyang underground laboratory. Analysis of the initial 59.5 days of COSINE-100 data showed that the annual modulation signal reported by DAMA is inconsistent with explanation using spin-independent interaction of weakly interacting massive particles (WIMPs), a favored candidate of dark matter particles, with sodium or iodine nuclei in the context of the standard halo mode. However, this first result left open interpretations using certain alternative dark matter models, dark matter halo distributions, and detector responses that could allow room for consistency between DAMA and COSINE-100. Here we present new results from over 1.7 years of COSINE-100 operation with improved event selection and energy threshold reduced from 2 keV to 1 keV. We find an order of magnitude improvement in sensitivity, sufficient for the first time to strongly constrain these alternative scenarios, as well as to further strengthen the previously observed inconsistency with the WIMP-nucleon spin-independent interaction hypothesis.

scholarly journals On the annual modulation signal in dark matter direct detection

2012 ◽  
Vol 2012 (03) ◽  
pp. 005-005 ◽  
Author(s):  
Juan Herrero-Garcia ◽  
Thomas Schwetz ◽  
Jure Zupan
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Annual Modulation ◽  
Modulation Signal

scholarly journals Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment

2019 ◽  
Vol 123 (3) ◽  
Author(s):  
G. Adhikari ◽  
P. Adhikari ◽  
E. Barbosa de Souza ◽  
N. Carlin ◽  
S. Choi ◽  
...  
Keyword(s):  
Dark Matter ◽  
Annual Modulation ◽  
Modulation Signal

A Nylon Filter A-ELISA for Detecting Viruses in Water

1993 ◽  
Vol 27 (7-8) ◽  
pp. 135-141 ◽  
Author(s):  
Abidelfatah M. Nasser ◽  
Yehudit Elkana ◽  
Leon Goldstein
Keyword(s):  
Positive Result ◽  
Solid Phase ◽  
Enteric Viruses ◽  
High Specificity ◽  
Negative Results ◽  
Order Of Magnitude ◽  
Lower Background

This study was designed to develop a modification of A-ELISA performed in microtitre plates. Nylon filters have been utilized successfully as a solid phase for the performance of A-ELISA. The use of nylon filters resulted in lower background than nitro-cellulose and paper filters, indicating their suitability as a solid phase for developing A-ELISA. With enteric viruses, human rotaviruses and MS-2 coliphage, negative results were obtained, suggesting high specificity of the developed technique for poliovirus 1. The sensitivity of the developed A-ELISA has been shown to be at least one order of magnitude greater than ordinary ELISA. A positive result with the nylon A-ELISA can be obtained with samples containing 100-1000 pfu/ml of poliovirus. Up to date methods used for detecting viruses in water are elaborate, time consuming and costly. Applying the nylon A-ELISA may overcome some of these disadvantages.

scholarly journals Experiments to test the possibility of transmutation by electronic bombardment

1927 ◽  
Vol 114 (767) ◽  
pp. 289-292 ◽  
Keyword(s):  
Melting Point ◽  
Positive Result ◽  
Quartz Tube ◽  
Pure Preparation ◽  
Negative Results

In an earlier paper experiments were described which were carried out in order to test the production of gold from mercury, as reported by Miethe and Stammreich, and by Nagaoka. These experiments led to conclusively negative results, but it was considered desirable to repeat also the work of Smits and Karssen upon the conversion of lead into thallium and mercury. To this end it was decided to adapt the quartz tube apparatus with sealed in tungsten leads, already used in the case of mercury, and described and illustrated in the previous paper (interrupted arc method). While waiting for a specially pure preparation of lead, tin suggested itself as a suitable metal for further experimentation. Besides its low melting point, there is the further advantage that indium, the most probable product of any transmutation of tin, can be spectroscopically detected in exceedingly minute traces, whilst its occurrence is so limited that the danger of accidental contamination from the ordinary materials of the laboratory is much smaller than is the case with most elements. In this respect, a positive result with indium would be more convincing than the production of mercury reported by Smits.

scholarly journals Dark-matter harmonics beyond annual modulation

2013 ◽  
Vol 2013 (11) ◽  
pp. 033-033 ◽  
Author(s):  
Samuel K Lee ◽  
Mariangela Lisanti ◽  
Benjamin R Safdi
Keyword(s):  
Dark Matter ◽  
Annual Modulation
Sign in / Sign up

Export Citation Format

Share Document