dorsal/arxiv
View SchemaComment on "A Search for Narrow Sum Energy Lines in Electron-Positron Pair Emission from Heavy Ion collisions near the Coulomb Barrier"
| Authors | James J. Griffin |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9703041 |
| URL | https://arxiv.org/abs/nucl-th/9703041 |
Abstract
The report of Ahmad et al., states that ``No evidence is found for sharp peaks in the present data.'' But this statement is factually inaccurate. Figure 1 exhibits the APEX' published U + Th ``wedge cut'' data, and background, which show a distinct (3.2 sigma) maximum of 83 excess pair counts in the 20 keV bin near 790 keV. A one-gaussian best fit to this excess reduces chi-squared (for the 21 bins from 500 to 920 keV) by 12.6 from 28.3 to 16.7, and the reduced chi-squared value from 1.41 to 0.98. Furthermore, at the 99% Confidence Level, the data impose lower and upper bounds of (24, 146) respectively upon the mean excess pair count in this bin. This data therefore provides positive, statistically significant evidence for sharp pairs near 790 keV. Whether this evidence is compelling is a separate question not addressed here.
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"date_created": "2026-03-02T18:00:17.930000Z",
"date_modified": "2026-03-02T18:00:17.930000Z",
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"abstract": "The report of Ahmad et al., states that ``No evidence is found for sharp\npeaks in the present data.\u0027\u0027 But this statement is factually inaccurate. Figure\n1 exhibits the APEX\u0027 published U + Th ``wedge cut\u0027\u0027 data, and background, which\nshow a distinct (3.2 sigma) maximum of 83 excess pair counts in the 20 keV bin\nnear 790 keV. A one-gaussian best fit to this excess reduces chi-squared (for\nthe 21 bins from 500 to 920 keV) by 12.6 from 28.3 to 16.7, and the reduced\nchi-squared value from 1.41 to 0.98. Furthermore, at the 99% Confidence Level,\nthe data impose lower and upper bounds of (24, 146) respectively upon the mean\nexcess pair count in this bin. This data therefore provides positive,\nstatistically significant evidence for sharp pairs near 790 keV. Whether this\nevidence is compelling is a separate question not addressed here.",
"arxiv_id": "nucl-th/9703041",
"authors": [
"James J. Griffin"
],
"categories": [
"nucl-th"
],
"title": "Comment on \"A Search for Narrow Sum Energy Lines in Electron-Positron Pair Emission from Heavy Ion collisions near the Coulomb Barrier\"",
"url": "https://arxiv.org/abs/nucl-th/9703041"
},
"schema_id": "dorsal/arxiv",
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