Search for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory

The spectrum of high-energy γ rays accompanying spontaneous fission of 252Cf has been measured in γ-γ coincidence mode to search for the nucleus-nucleus coherent bremsstrahlung. The experiment was performed at the underground laboratory (555 meter depth) which provides a natural attenuation of the c...

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Autores principales:	Deepak Pandit, Debasish Mondal, T.K. Ghosh, S. Mukhopadhyay, Surajit Pal, A. Sen, A.K. Saha, V.N. Jha, Satyajit Saha, C. Bhattacharya, A.K. Mohanty
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Coherent bremsstrahlung Spontaneous fission BaF2 detectors Physics QC1-999
Acceso en línea:	https://doaj.org/article/efd7d90edaa3423a968b29625a9df32b
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spelling	oai:doaj.org-article:efd7d90edaa3423a968b29625a9df32b2021-12-04T04:32:37ZSearch for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory0370-269310.1016/j.physletb.2021.136760https://doaj.org/article/efd7d90edaa3423a968b29625a9df32b2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0370269321007000https://doaj.org/toc/0370-2693The spectrum of high-energy γ rays accompanying spontaneous fission of 252Cf has been measured in γ-γ coincidence mode to search for the nucleus-nucleus coherent bremsstrahlung. The experiment was performed at the underground laboratory (555 meter depth) which provides a natural attenuation of the cosmic muon flux by a factor of 2 x 104. A total of 2.5 x 1010 fission events were recorded but high-energy γ rays > 25 MeV were not observed at the level as reported in the previous experiments at surface level. The measurement provides a new upper limit at 95% confidence level of 5 x 10−11 photons/(fission x MeV) for γ-ray emission from the nucleus-nucleus coherent bremsstrahlung in 25-180 MeV energy region, which is two orders of magnitude lower than the previous value. The result has been compared with the existing theoretical models. The fully quantum approach and potential barrier included Coulomb acceleration calculation predict two orders of magnitude and one order of magnitude higher emission probability, respectively, in 25-60 MeV energy range compared to the new upper limit indicating towards the modification of the theories.Deepak PanditDebasish MondalT.K. GhoshS. MukhopadhyaySurajit PalA. SenA.K. SahaV.N. JhaSatyajit SahaC. BhattacharyaA.K. MohantyElsevierarticleCoherent bremsstrahlungSpontaneous fissionBaF2 detectorsPhysicsQC1-999ENPhysics Letters B, Vol 823, Iss , Pp 136760- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Coherent bremsstrahlung Spontaneous fission BaF2 detectors Physics QC1-999
spellingShingle	Coherent bremsstrahlung Spontaneous fission BaF2 detectors Physics QC1-999 Deepak Pandit Debasish Mondal T.K. Ghosh S. Mukhopadhyay Surajit Pal A. Sen A.K. Saha V.N. Jha Satyajit Saha C. Bhattacharya A.K. Mohanty Search for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory
description	The spectrum of high-energy γ rays accompanying spontaneous fission of 252Cf has been measured in γ-γ coincidence mode to search for the nucleus-nucleus coherent bremsstrahlung. The experiment was performed at the underground laboratory (555 meter depth) which provides a natural attenuation of the cosmic muon flux by a factor of 2 x 104. A total of 2.5 x 1010 fission events were recorded but high-energy γ rays > 25 MeV were not observed at the level as reported in the previous experiments at surface level. The measurement provides a new upper limit at 95% confidence level of 5 x 10−11 photons/(fission x MeV) for γ-ray emission from the nucleus-nucleus coherent bremsstrahlung in 25-180 MeV energy region, which is two orders of magnitude lower than the previous value. The result has been compared with the existing theoretical models. The fully quantum approach and potential barrier included Coulomb acceleration calculation predict two orders of magnitude and one order of magnitude higher emission probability, respectively, in 25-60 MeV energy range compared to the new upper limit indicating towards the modification of the theories.
format	article
author	Deepak Pandit Debasish Mondal T.K. Ghosh S. Mukhopadhyay Surajit Pal A. Sen A.K. Saha V.N. Jha Satyajit Saha C. Bhattacharya A.K. Mohanty
author_facet	Deepak Pandit Debasish Mondal T.K. Ghosh S. Mukhopadhyay Surajit Pal A. Sen A.K. Saha V.N. Jha Satyajit Saha C. Bhattacharya A.K. Mohanty
author_sort	Deepak Pandit
title	Search for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory
title_short	Search for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory
title_full	Search for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory
title_fullStr	Search for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory
title_full_unstemmed	Search for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory
title_sort	search for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/efd7d90edaa3423a968b29625a9df32b
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Search for coherent bremsstrahlung from spontaneous fission at 555 meter deep underground laboratory

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