{"id":3182,"date":"2022-12-12T08:00:44","date_gmt":"2022-12-12T08:00:44","guid":{"rendered":"https:\/\/tandetron.atomki.hu\/2022\/12\/12\/new-anomaly-observed-in\/"},"modified":"2023-04-11T19:19:39","modified_gmt":"2023-04-11T19:19:39","slug":"new-anomaly-observed-in","status":"publish","type":"post","link":"https:\/\/tandetron.atomki.hu\/en\/2022\/12\/12\/new-anomaly-observed-in\/","title":{"rendered":"New anomaly observed in 12<\/sup>C supports the existence and the vector character of the hypothetical X17 boson"},"content":{"rendered":"

[vc_row][vc_column][vc_custom_heading source=”post_title” font_container=”tag:h3|text_align:left” use_theme_fonts=”yes”][vc_text_separator title=”PERIODICAL PUBLICATIONS” title_align=”separator_align_left” color=”custom” style=”dotted” border_width=”2″ css_animation=”right-to-left” accent_color=”#ffac03″][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]A.J. Krasznahorkay, A. Krasznahorkay, M. Begala, M. Csatl\u00f3s, L. Csige, J. Guly\u00e1s, A. Krak\u00f3, J. Tim\u00e1r, I. Rajta, I. Vajda, N.J. Sas:
\nNew anomaly observed in 12C supports the existence and the vector character of the hypothetical X17 boson<\/em>
\nPhysical Review C 106 (2022) L061601<\/b><\/span><\/p>\n

DOI: https:\/\/doi.org\/10.1103\/PhysRevC.106.L061601<\/a><\/strong><\/span><\/p>\n

Published: <\/strong><\/span>12 December 2022[\/vc_column_text][vc_column_text]Abstract<\/span><\/strong><\/p>\n

\n

Employing the 11<\/sup><\/span><\/span><\/span>B<\/span><\/span><\/span>(<\/span><\/span>p<\/span><\/span>,<\/span><\/span>\u03b3<\/span><\/span>)<\/span><\/span>12<\/sup><\/span><\/span><\/span>C<\/span><\/span><\/span><\/span><\/span><\/span><\/span> nuclear reaction, the angular correlation of e+<\/sup><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>e–<\/sup><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u00a0pairs was investigated in the angular range of 40<\/span><\/span><\/span>\u2218<\/span><\/span><\/span><\/span>\u2264<\/span><\/span>\u0398<\/span><\/span>\u2264<\/span><\/span>175<\/span><\/span><\/span>\u2218<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> for five different proton energies between E<\/span><\/span><\/span>p<\/span><\/span><\/span><\/span>=<\/span><\/span>1.50<\/span><\/span><\/span><\/span><\/span><\/span>\u20132.5 MeV. At small angles (\u0398<\/span><\/span>\u2264<\/span><\/span>120<\/span><\/span><\/span>\u2218<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>), the results can be well interpreted by the internal pair creation process of electromagnetic radiations with E<\/span><\/span>1<\/span><\/span><\/span><\/span><\/span><\/span> and M<\/span><\/span>1<\/span><\/span><\/span><\/span><\/span><\/span> multipolarities and by the external pair creation in the target backing. However, at angles greater than 120<\/span><\/span><\/span>\u2218<\/span><\/span><\/span><\/span><\/span><\/span><\/span>, additional count excesses and anomalies were observed, which could be well accounted for by the existence of the previously suggested hypothetical X17 particle. Our results suggest that the X17 particle was generated mainly in E<\/span><\/span>1<\/span><\/span><\/span><\/span><\/span><\/span>radiation. The derived mass of the particle is m<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>x<\/sub><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>c2<\/sup><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>=<\/span><\/span>17.03<\/span><\/span>\u00b1<\/span><\/span>0.11<\/span><\/span>(<\/span><\/span>stat<\/span><\/span>)<\/span><\/span><\/span>\u00b1<\/span><\/span>0.20<\/span><\/span>(<\/span><\/span>syst<\/span><\/span>)<\/span><\/span><\/span><\/span><\/span><\/span><\/span> MeV. According to the mass, and to the derived branching ratio [B<\/span><\/span><\/span>x<\/span><\/span><\/span><\/span>=<\/span><\/span>3.6<\/span><\/span>(<\/span><\/span>3<\/span><\/span>)<\/span><\/span><\/span>\u00d7<\/span><\/span>10<\/span><\/span><\/span>\u2212<\/span><\/span>6<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>], this is likely the same X17 particle that we recently suggested for describing the anomaly observed in the decay of 8<\/sup><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>Be<\/span><\/span><\/span><\/span><\/span><\/span> and 4<\/sup><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>He<\/span><\/span><\/span><\/span><\/span><\/span>.<\/p>\n<\/div>\n

[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_btn title=”Back to PERIODICAL PUBLICATIONS page” style=”outline-custom” outline_custom_color=”#000000″ outline_custom_hover_background=”#ffac03″ outline_custom_hover_text=”#ffffff” shape=”round” size=”sm” i_icon_fontawesome=”fas fa-arrow-left” add_icon=”true” link=”url:https%3A%2F%2Ftandetron.atomki.hu%2Fen%2Fr-d%2Fpublications%2Fperiodical-publications%2F|title:Foly%C3%B3irat%20publik%C3%A1ci%C3%B3″][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_custom_heading source=”post_title” font_container=”tag:h3|text_align:left” use_theme_fonts=”yes”][vc_text_separator title=”PERIODICAL PUBLICATIONS” title_align=”separator_align_left” color=”custom” style=”dotted” border_width=”2″ css_animation=”right-to-left” accent_color=”#ffac03″][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]A.J. Krasznahorkay, A. Krasznahorkay, M. Begala, M. Csatl\u00f3s, L. Csige, J. Guly\u00e1s, A. Krak\u00f3, J. [\u2026]<\/span><\/p>\n","protected":false},"author":1,"featured_media":2214,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"jetpack_post_was_ever_published":false,"footnotes":""},"categories":[47],"tags":[],"class_list":["post-3182","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-periodical-publication"],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/tandetron.atomki.hu\/wp-content\/uploads\/sites\/3\/2020\/06\/tandetron-periodical-publication-ikon.png?fit=1024%2C768&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/paFlKz-Pk","_links":{"self":[{"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/posts\/3182","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/comments?post=3182"}],"version-history":[{"count":2,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/posts\/3182\/revisions"}],"predecessor-version":[{"id":3184,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/posts\/3182\/revisions\/3184"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/media\/2214"}],"wp:attachment":[{"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/media?parent=3182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/categories?post=3182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/tags?post=3182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}