Comparison between DAMA/LIBRA and COSINE-100 in the light of quenching factors

Ko, Y. J.; Adhikari, G.; Adhikari, P.; Souza, E. Barbosa de; Carlin, N.; Choi, J.J.; Choi, S.; Djamal, Mitra; Ezeribe, A. C.; Ha, C.; Hahn, I. S.; Jeon, E. J.; Jo, J. H.; Kang, W. G.; Kauer, M.; Kim, G.S.; Kim, Heonoh; Kim, H.J.; Kim, K.W.; Kim, N.Y.; Kim, S.K.; Kim, Y.D.; Kim, Yoon Hak; Lee, E.K.; Lee, H.S.; Lee, J.; Lee, J.Y.; Lee, M.H.; Lee, S.H.; Leonard, D. S.; Lynch, W.; Manzato, B. B.; Maruyama, R.; Neal, Robert J.; Olsen, S. L.; Park, B.J.; Park, H.K.; Park, H.S.; Park, K.S.; Pitta, R. L. C.; Prihtiadi, H.; Ra, Sejin; Rott, C.; Shin, Keon Ah; Scarff, A.; Spooner, N. J. C.; Thompson, W.G.; Yang, L.; Yu, G. H.

doi:10.1088/1475-7516/2019/11/008

Cited by 27 publications

(43 citation statements)

References 67 publications

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“…Even though tremendous efforts to search for evidence of WIMP dark matter by directly detecting nuclei recoiling from WIMP-nucleus interactions are being pursued, no definitive signal has been observed [6,7]. One exception is the DAMA experiment that, using an array of NaI(Tl) detectors [8,9], observes an annual modulation of event rates that can be interpreted as resulting from WIMP-nuclei interactions [10,11]. However, this result has been the subject of a continuing debate because the WIMP-nucleon cross sections inferred from the DAMA modulation are in conflict with limits from other experiments [12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment

et al. 2020

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The annual modulation signal observed by the DAMA experiment is a long-standing question in the community of dark matter direct detection. This necessitates an independent verification of its existence using the same detection technique. The COSINE-100 experiment has been operating with 106 kg of low-background NaI(Tl) detectors providing interesting checks on the DAMA signal. However, due to higher backgrounds in the NaI(Tl) crystals used in COSINE-100 relative to those used for DAMA, it was difficult to reach final conclusions. Since the start of COSINE-100 data taking in 2016, we also have initiated a program to develop ultra-pure NaI(Tl) crystals for COSINE-200, the next phase of the experiment. The program includes efforts of raw powder purification, ultra-pure NaI(Tl) crystal growth, and detector assembly techniques. After extensive research and development of NaI(Tl) crystal growth, we have successfully grown a few small-size (0.61-0.78 kg) thalliumdoped crystals with high radio-purity. A high light yield has been achieved by improvements of our detector assembly technique. Here we report the ultra-pure NaI(Tl) detector developments at the Institute for Basic Science, Korea. The technique developed here will be applied to the production of NaI(Tl) detectors for the COSINE-200 experiment.

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Section: Introductionmentioning

confidence: 99%

Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment

et al. 2020

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“…The upgraded DAMA/LIBRA detector confirmed the earlier result of DAMA/NaI, collecting more data and reaching a significance of about 13 σ (loosely speaking) for the cumulative exposure [1][2][3][4][5][6]. The ANAIS [7][8][9] and COSINE [10][11][12] experiments employ NaI crystals like DAMA, and are also looking for an annual modulation in the counting rate. So far they have not reported any modulation, but their sensitivity is not yet sufficient to probe the DAMA signal [12,13].…”

Section: Introductionmentioning

confidence: 54%

“…The ANAIS [7][8][9] and COSINE [10][11][12] experiments employ NaI crystals like DAMA, and are also looking for an annual modulation in the counting rate. So far they have not reported any modulation, but their sensitivity is not yet sufficient to probe the DAMA signal [12,13]. Furthermore, a DM signal compatible with the DAMA result has not been confirmed by other experiments which use different detectors and techniques (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Annual modulations from secular variations: relaxing DAMA?

Buttazzo

Panci

Rossi

et al. 2020

J. High Energ. Phys.

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The DAMA collaboration reported an annually modulated rate with a phase compatible with a Dark Matter induced signal. We point out that a slowly varying rate can bias or even simulate an annual modulation if data are analyzed in terms of residuals computed by subtracting approximately yearly averages starting from a fixed date, rather than a background continuous in time. In the most extreme case, the amplitude and phase of the annual modulation reported by DAMA could be alternatively interpreted as a decennial growth of the rate. This possibility appears mildly disfavoured by a detailed study of the available data, but cannot be safely excluded. In general, a decreasing or increasing rate could partially reduce or enhance a true annual modulation, respectively. The issue could be clarified by looking at the full time-dependence of the DAMA total rate, not explicitly published so far.

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“…At any rate, several projects (COSINE-100 [106], ANAIS [107], SABRE [108]) are repeating DAMA's measurement using similar NaI detectors to shed further light on this anomaly. Recent results from COSINE-100 experiment provide evidence that the nuclear recoil quenching factors (critical for calibrating the energy scale of NRs) that DAMA/Libra has been using are incorrect at low energies [109]. Correcting for this effect, they are able to exclude the DAMA/Libra detection with 90% confidence.…”

Section: Bubble Chambers Like Pico and Superheated Droplet Detectors mentioning

confidence: 99%

Cryogenic Detector Development for SuperCDMS

Mast

2020

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Completing this work has certainly been a journey. Along the way there were triumphs and setbacks, tremendous gains and devastating losses. Many things are quite different now than they were over six years ago when I first found myself a fresh grad student in old Tate hall. The research presented here has all taken place against a backdrop of changing personal, political, and societal conditions. I have only managed to navigate this all due to aid of many people, and I owe each of them my thanks for the influence they have had in my life. Because you are so numerous and I so forgetful, I am certain to neglect some of you, but here goes... First I thank Prisca Cushman and Vuk Mandic who have together steered the course of the SuperCDMS group at UMN. Their scientific, professional, and personal guidance have helped shape me into a better physicist. In particular I thank my advisor Vuk for his calm and insightful manner and superb mentorship. Your steady hand has been a great help and comfort to me at many times, certainly more than I have let show. Thanks also to the post-docs I had the pleasure of working with at UMN, including Hassan Chagani, Matt Fritts, and Anthony Villano. Hassan and Matt, you helped me learn how to operate a dilution fridge with enough confidence to only occasionally wake bolt upright in the middle of the night in fear that I had left some important valve open and lost all the mix! From what I understand now, that is actually a sign of a reasonable level of competence, so thank you! Matt and Anthony, you helped me to learn many of the nuts and bolts of the particular blend of astrophysical, solid state, and experimental particle physics that is DM research. You have also shown through your diligent work and attention to detail how essential, but also how hard it is to produce good, solid, and valuable scientific results. While I am a better researcher for having worked with each of you, more importantly, I value you both as friends.

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Comparison between DAMA/LIBRA and COSINE-100 in the light of quenching factors

Cited by 27 publications

References 67 publications

Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment

Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment

Annual modulations from secular variations: relaxing DAMA?

Cryogenic Detector Development for SuperCDMS

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