Confirmation of the existence of the X17 particle
In a 2016 paper, an anomaly in the internal pair creation on the M1 transition depopulating the 18.15 MeV isoscalar 1+ state on 8Be was observed. This could be explained by the creation and subsequent decay of a new boson, with mass mXc2 = 16.70 MeV. Further experiments of the same transition with a...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2020-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2020/08/epjconf_hias2019_04005.pdf |
| _version_ | 1818652895318376448 |
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| author | Firak D. S. Krasznahorkay A. J. Csatlós M. Csige L. Gulyás J. Koszta M. Szihalmi B. Timár J. Nagy Á. Sas N. J. Krasznahorkay A. |
| author_facet | Firak D. S. Krasznahorkay A. J. Csatlós M. Csige L. Gulyás J. Koszta M. Szihalmi B. Timár J. Nagy Á. Sas N. J. Krasznahorkay A. |
| author_sort | Firak D. S. |
| collection | DOAJ |
| description | In a 2016 paper, an anomaly in the internal pair creation on the M1 transition depopulating the 18.15 MeV isoscalar 1+ state on 8Be was observed. This could be explained by the creation and subsequent decay of a new boson, with mass mXc2 = 16.70 MeV. Further experiments of the same transition with an improved and independent setup were performed, which constrained the mass of the X17 boson (mXc2) and its branching ratio relative to the γ-decay of the 8Be excited state (BX), to mXc2 = 17.01(16) MeV and BX = 6(1) 10−6, respectively. Using the latter setup, the e+e− pairs depopulating the 21 MeV Jπ = 0− 0+ transition in 4He were investigated and a resonance in the angular correlation of the pairs was observed, which could be explained by the same X17 particle, with mass mXc2 = 16.98 ± 0.16(stat) ± 0.20(syst) MeV. |
| first_indexed | 2024-12-17T02:29:16Z |
| format | Article |
| id | doaj.art-3fd175e0b3834bd5b7c38de8ee52598b |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-17T02:29:16Z |
| publishDate | 2020-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-3fd175e0b3834bd5b7c38de8ee52598b2022-12-21T22:07:00ZengEDP SciencesEPJ Web of Conferences2100-014X2020-01-012320400510.1051/epjconf/202023204005epjconf_hias2019_04005Confirmation of the existence of the X17 particleFirak D. S.0Krasznahorkay A. J.1Csatlós M.2Csige L.3Gulyás J.4Koszta M.5Szihalmi B.6Timár J.7Nagy Á.8Sas N. J.9Krasznahorkay A.10University of DebrecenInstitute for Nuclear Research (Atomki)Institute for Nuclear Research (Atomki)Institute for Nuclear Research (Atomki)Institute for Nuclear Research (Atomki)Institute for Nuclear Research (Atomki)Institute for Nuclear Research (Atomki)Institute for Nuclear Research (Atomki)Institute for Nuclear Research (Atomki)University of DebrecenCERN, Geneva, Switzerland and Institute for Nuclear Research (Atomki)In a 2016 paper, an anomaly in the internal pair creation on the M1 transition depopulating the 18.15 MeV isoscalar 1+ state on 8Be was observed. This could be explained by the creation and subsequent decay of a new boson, with mass mXc2 = 16.70 MeV. Further experiments of the same transition with an improved and independent setup were performed, which constrained the mass of the X17 boson (mXc2) and its branching ratio relative to the γ-decay of the 8Be excited state (BX), to mXc2 = 17.01(16) MeV and BX = 6(1) 10−6, respectively. Using the latter setup, the e+e− pairs depopulating the 21 MeV Jπ = 0− 0+ transition in 4He were investigated and a resonance in the angular correlation of the pairs was observed, which could be explained by the same X17 particle, with mass mXc2 = 16.98 ± 0.16(stat) ± 0.20(syst) MeV.https://www.epj-conferences.org/articles/epjconf/pdf/2020/08/epjconf_hias2019_04005.pdf |
| spellingShingle | Firak D. S. Krasznahorkay A. J. Csatlós M. Csige L. Gulyás J. Koszta M. Szihalmi B. Timár J. Nagy Á. Sas N. J. Krasznahorkay A. Confirmation of the existence of the X17 particle EPJ Web of Conferences |
| title | Confirmation of the existence of the X17 particle |
| title_full | Confirmation of the existence of the X17 particle |
| title_fullStr | Confirmation of the existence of the X17 particle |
| title_full_unstemmed | Confirmation of the existence of the X17 particle |
| title_short | Confirmation of the existence of the X17 particle |
| title_sort | confirmation of the existence of the x17 particle |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2020/08/epjconf_hias2019_04005.pdf |
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