{"id":3139,"date":"2021-10-18T08:00:50","date_gmt":"2021-10-18T08:00:50","guid":{"rendered":"https:\/\/tandetron.atomki.hu\/2021\/10\/18\/new-anomaly-observed-in-4he-supports-the-existence-of-the-hypothetical-x17-particle\/"},"modified":"2023-04-11T08:20:43","modified_gmt":"2023-04-11T08:20:43","slug":"new-anomaly-observed-in-4he-supports-the-existence-of-the-hypothetical-x17-particle","status":"publish","type":"post","link":"https:\/\/tandetron.atomki.hu\/en\/2021\/10\/18\/new-anomaly-observed-in-4he-supports-the-existence-of-the-hypothetical-x17-particle\/","title":{"rendered":"New anomaly observed in 4<\/sup>He supports the existence of the hypothetical X17 particle"},"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, M. Csatl\u00f3s, L. Csige, J. Guly\u00e1s, A. Krasznahorkay, B.M. Nyak\u00f3, I. Rajta, J. Tim\u00e1r, I. Vajda, N.J. Sas:
\nNew anomaly observed in 4He supports the existence of the hypothetical X17 particle<\/em>,
\nPhysical Review C 104, 044003 (2021)<\/b><\/span><\/p>\n

DOI: https:\/\/doi.org\/10.1103\/PhysRevC.104.044003<\/a><\/strong><\/span><\/p>\n

Published:<\/strong><\/span> 18 October 2021[\/vc_column_text][vc_column_text]Abstract<\/span><\/strong><\/p>\n

\n

Angular correlation spectra of e<\/span><\/span><\/span>+<\/span><\/span><\/span><\/span>e<\/span><\/span><\/span>\u2212<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> pairs produced in the 3<\/sup><\/span><\/span><\/span>H<\/span><\/span><\/span>(<\/span><\/span>p<\/span><\/span>,<\/span><\/span>e<\/span><\/span><\/span>+<\/span><\/span><\/span><\/span>e<\/span><\/span><\/span>\u2212<\/span><\/span><\/span><\/span>)<\/span><\/span>4<\/sup><\/span><\/span><\/span>He<\/span><\/span><\/span><\/span><\/span><\/span><\/span> nuclear reaction have been studied at E<\/span><\/span><\/span>p<\/span><\/span><\/span><\/span>=<\/span><\/span>510<\/span><\/span><\/span><\/span><\/span><\/span>, 610, and 900 keV proton energies. The main features of the spectra can be understood by taking into account the internal and external pair creations following the proton capture by 3<\/sup><\/span><\/span><\/span>H<\/span><\/span><\/span><\/span><\/span><\/span>. However, these processes cannot account for an observed peak around 115<\/span><\/span><\/span>\u2218<\/span><\/span><\/span><\/span><\/span><\/span><\/span> in the angular correlation spectra. This anomalous excess of e<\/span><\/span><\/span>+<\/span><\/span><\/span><\/span>e<\/span><\/span><\/span>\u2212<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> pairs can be described by the creation and subsequent decay of a light particle during the direct capture process. The derived mass of the particle is m<\/span><\/span><\/span>X<\/sub><\/span><\/span><\/span><\/span>c<\/span><\/span><\/span>2<\/sup><\/span><\/span><\/span><\/span>=<\/span><\/span>16.94<\/span><\/span>\u00b1<\/span><\/span>0.12<\/span><\/span>(<\/span><\/span>stat<\/span><\/span>)<\/span><\/span><\/span>\u00b1<\/span><\/span>0.21<\/span><\/span>(<\/span><\/span>syst<\/span><\/span>)<\/span><\/span><\/span><\/span><\/span><\/span><\/span> MeV. According to the mass this is likely the same X17 particle, which we recently suggested [Phys. Rev. Lett. 116<\/b>, 042501 (2016)<\/a>] for describing the anomaly observed in the decay of 8<\/span><\/span><\/span>Be<\/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, M. Csatl\u00f3s, L. Csige, J. Guly\u00e1s, A. Krasznahorkay, B.M. Nyak\u00f3, I. Rajta, 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-3139","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-OD","_links":{"self":[{"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/posts\/3139","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=3139"}],"version-history":[{"count":3,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/posts\/3139\/revisions"}],"predecessor-version":[{"id":3142,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/posts\/3139\/revisions\/3142"}],"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=3139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/categories?post=3139"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tandetron.atomki.hu\/en\/wp-json\/wp\/v2\/tags?post=3139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}