@article{MTMT:33541847,
	title = {A new light particle is being born},
	url = {https://m2.mtmt.hu/api/publication/33541847},
	author = {Krasznahorkay, Attila and Begala, Marcell and Véghné Csatlós, Margit and Csige, Lóránt and Gulyás, János and Krakó, Attila and Krasznahorkay, Attila and Nyakó, Barna Mátyás and Rajta, István and Sas, Nándor and Timár, János and Vajda, István K.},
	doi = {10.1088/1742-6596/2391/1/012007},
	journal-iso = {J PHYS CONF SER},
	journal = {JOURNAL OF PHYSICS-CONFERENCE SERIES},
	volume = {2391},
	unique-id = {33541847},
	issn = {1742-6588},
	abstract = {A few years ago we observed anomalous electron-positron angular correlations for the 18.15 MeV M1 transition of 8 Be. This was interpreted as the creation and decay of an intermediate bosonic particle with a mass of m 0 c 2 =16.70±0.35(stat )±0.5(sys) MeV, which is now called X17. The possible relation of the X17 boson to the dark matter problem triggered an enormous interest in the wider physics community. We also observed a similar anomaly in 4 He, which could be described also by the creation and subsequent decay of the same X17 particle. Very recently, the 11 B proton capture reaction was used for exciting the 17.2 MeV broad (Γ=1.15 MeV) resonance in 12 C and studying their internal pair creation decay. Anomalies were observed in the angular correlation of the electron-positron pairs, which together with the 8 Be and 4 He data provides kinematic evidence for the X17 particle and supports their vector boson and fifth force explanation.},
	year = {2022},
	eissn = {1742-6596},
	orcid-numbers = {Vajda, István K./0000-0001-7116-9442}
}

@article{MTMT:33327781,
	title = {New anomaly observed in C 12 supports the existence and the vector character of the hypothetical X17 boson},
	url = {https://m2.mtmt.hu/api/publication/33327781},
	author = {Krasznahorkay, Attila and Krasznahorkay, Attila and Begala, Marcell and Véghné Csatlós, Margit and Csige, Lóránt and Gulyás, János and Krakó, Attila and Timár, János and Rajta, István and Vajda, István K. and Sas, Nándor},
	doi = {10.1103/PhysRevC.106.L061601},
	journal-iso = {PHYS REV C},
	journal = {PHYSICAL REVIEW C},
	volume = {106},
	unique-id = {33327781},
	issn = {2469-9985},
	year = {2022},
	eissn = {2469-9993},
	orcid-numbers = {Vajda, István K./0000-0001-7116-9442}
}

@article{MTMT:32461516,
	title = {New anomaly observed in 4He supports the existence of the hypothetical X17 particle},
	url = {https://m2.mtmt.hu/api/publication/32461516},
	author = {Krasznahorkay, Attila and Véghné Csatlós, Margit and Csige, Lóránt and Gulyás, János and Krasznahorkay, Attila and Nyakó, Barna Mátyás and Rajta, István and Timár, János and Vajda, István K. and Sas, Nándor},
	doi = {10.1103/PhysRevC.104.044003},
	journal-iso = {PHYS REV C},
	journal = {PHYSICAL REVIEW C},
	volume = {104},
	unique-id = {32461516},
	issn = {2469-9985},
	year = {2021},
	eissn = {2469-9993},
	orcid-numbers = {Vajda, István K./0000-0001-7116-9442}
}

@article{MTMT:31795368,
	title = {A new anomaly observed in 4 He supporting the existence of the hypothetical X17 particle},
	url = {https://m2.mtmt.hu/api/publication/31795368},
	author = {Krasznahorkay, Attila and Véghné Csatlós, Margit and Csige, Lóránt and Gulyás, János and Koszta, M. and Szihalmi, B. and Timár, János and Firak, D.S. and Nagy, Ádám and Sas, Nándor and Krasznahorkay, Attila},
	doi = {10.1088/1742-6596/1643/1/012001},
	journal-iso = {J PHYS CONF SER},
	journal = {JOURNAL OF PHYSICS-CONFERENCE SERIES},
	volume = {1643},
	unique-id = {31795368},
	issn = {1742-6588},
	year = {2020},
	eissn = {1742-6596},
	orcid-numbers = {Nagy, Ádám/0000-0001-9578-3199}
}

@article{MTMT:31400226,
	title = {Confirmation of the existence of the X17 particle},
	url = {https://m2.mtmt.hu/api/publication/31400226},
	author = {Firak, D. S. and Krasznahorkay, Attila and Véghné Csatlós, Margit and Csige, Lóránt and Gulyás, János and Koszta, M. and Szihalmi, B. and Timár, János and Nagy, Ádám and Sas, Nándor and Krasznahorkay, Attila},
	doi = {10.1051/epjconf/202023204005},
	journal-iso = {EPJ WEB CONF},
	journal = {EPJ WEB OF CONFERENCES},
	volume = {232},
	unique-id = {31400226},
	issn = {2101-6275},
	year = {2020},
	eissn = {2100-014X},
	orcid-numbers = {Nagy, Ádám/0000-0001-9578-3199}
}

@article{MTMT:31103967,
	title = {Searching for the double gamma-decay of the X(17) particle},
	url = {https://m2.mtmt.hu/api/publication/31103967},
	author = {Nagy, Ádám and Krasznahorkay, Attila and Ciemala, M. and Véghné Csatlós, Margit and Csige, Lóránt and Gácsi, Zoltán and Hunyadi, Mátyás and Klaus, T. and Kmiecik, M. and Maj, A. and Pietralla, N. and Revay, Zs and Sas, Nándor and Stieghorst, C. and Timár, János and Tornyi, Tamás Gábor and Wasilewska, B.},
	doi = {10.1393/ncc/i2019-19124-8},
	journal-iso = {NUOVO CIMENTO C-COLLOQ COMMUN PHYS},
	journal = {NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS},
	volume = {42},
	unique-id = {31103967},
	issn = {2037-4909},
	abstract = {The e(-)e(+) decay of the candidate new particle X(17) has already been confirmed by previous experiments. However, theoretical models give different predictions for the spin and the parity of this particle. The double gamma-decay process could be an appropriate probe to shed light on such properties. Thus, for the first time, we searched for the gamma gamma decay of X(17) created in nuclear transitions. In this paper, we report preliminary results of two experiments on the J(pi) = 0(-) -> 0(+) transition in He-4.},
	year = {2019},
	eissn = {1826-9885},
	orcid-numbers = {Nagy, Ádám/0000-0001-9578-3199}
}

@article{MTMT:30655939,
	title = {On the X17 Light-particle Candidate Observed in Nuclear Transitions},
	url = {https://m2.mtmt.hu/api/publication/30655939},
	author = {Krasznahorkay, Attila and Véghné Csatlós, Margit and Csige, Lóránt and Firak, D. and Gulyás, János and Nagy, Ádám and Sas, Nándor and Timár, János and Tornyi, Tamás Gábor and Krasznahorkay, Attila},
	doi = {10.5506/APhysPolB.50.675},
	journal-iso = {ACTA PHYS POL B},
	journal = {ACTA PHYSICA POLONICA B},
	volume = {50},
	unique-id = {30655939},
	issn = {0587-4254},
	year = {2019},
	eissn = {1509-5770},
	pages = {675-684},
	orcid-numbers = {Nagy, Ádám/0000-0001-9578-3199}
}

@article{MTMT:3411216,
	title = {New results on the 8 Be anomaly},
	url = {https://m2.mtmt.hu/api/publication/3411216},
	author = {Krasznahorkay, Attila and Véghné Csatlós, Margit and Csige, Lóránt and Gácsi, Zoltán and Gulyás, János and Nagy, Ádám and Sas, Nándor and Timár, János and Tornyi, Tamás Gábor and Vajda, István K. and Krasznahorkay, Attila},
	doi = {10.1088/1742-6596/1056/1/012028},
	journal-iso = {J PHYS CONF SER},
	journal = {JOURNAL OF PHYSICS-CONFERENCE SERIES},
	volume = {1056},
	unique-id = {3411216},
	issn = {1742-6588},
	abstract = {Recently, we observed anomalous internal pair creation for the M1 transition depopulating the 18.15 MeV isoscalar 1 + state in 8 Be. We observed a significant ( σ = 7.37) peak-like deviation from the predicted angular correlation of the e + e pairs at θ = 140°. To the best of our knowledge no nuclear physics related description of such deviation can be made. However, the deviation can be described by assuming the creation and subsequent decay of a boson with mass of ≈17 MeV. In order to clarify the interpretation, we re-investigated the 8 Be anomaly with an improved, and independent setup. We have confirmed the signal of the assumed X(17) particle and constrained its mass ( m 0 c 2 = 17.01(16) MeV) and branching ratio compared to the γ-decay ( B x = 6(1) × 10 −6 ).},
	year = {2018},
	eissn = {1742-6596},
	orcid-numbers = {Nagy, Ádám/0000-0001-9578-3199; Vajda, István K./0000-0001-7116-9442}
}