COSINE-100 full dataset challenges the annual modulation signal of DAMA/LIBRA
- Nelson Carlin
- Jae Young Cho
- Jae Jin Choi
- Seonho Choi
- Anthony C. Ezeribe
- Luis Eduardo França
- Chang Hyon Ha
- In Sik Hahn
- Sophia J. Hollick
- Eunju Jeon
- Han Wool Joo
- Woon Gu Kang
- Matthew Kauer
- Bongho Kim
- Hongjoo Kim
- Jinyoung Kim
- Kyungwon Kim
- SungHyun Kim
- Sun Kee Kim
- Won Kyung Kim
- Yeongduk Kim
- Yong-Hamb Kim
- Young Ju Ko
- Doohyeok Lee
- Eun Kyung Lee
- Hyunseok Lee
- Hyun Su Lee
- Hye Young Lee
- In Soo Lee
- Jaison Lee
- Jooyoung Lee
- Moo Hyun Lee
- Seo Hyun Lee
- Seung Mok Lee
- Yujin Lee
- Douglas S. Leonard
- Nguyen Thanh Luan
- Vitor Hugo de Almeida Machado
- Bruno B. Manzato
- Reina H. Maruyama
- Robert J. Neal
- Stephen L. Olsen
- Byung Ju Park
- Hyang Kyu Park
- Hyeonseo Park
- Jong Chul Park
- Kangsoon Park
- Se Dong Park
- Ricardo L. C. Pitta
- Hafizh Prihtiadi
2025-09-03
For over 25 years, the DAMA/LIBRA collaboration has claimed to observe an annual modulation signal, suggesting the existence of dark matter interactions. However, no experiment using different target materials has observed a dark matter signal consistent with their result. To address this puzzle, the COSINE-100 collaboration conducted a model-independent test using sodium iodide crystal detectors, the same target material as DAMA/LIBRA. Analyzing data collected over 6.4 years by the effective mass of 61.3 kilograms, with improved energy calibration and time-dependent background modeling, we found no evidence of an annual modulation signal, challenging the DAMA/LIBRA result with a confidence level greater than 3σ. This finding represents a substantial step toward resolving the long-standing debate surrounding DAMA/LIBRA’s dark matter claim, indicating that the observed modulation is unlikely to be caused by dark matter interactions.