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Production and characterisation of molybdenum/HOPG thin targets for the NUMEN experiment.

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Title: Production and characterisation of molybdenum/HOPG thin targets for the NUMEN experiment.
Authors: Fisichella, M.1,2 (AUTHOR) maria.fisichella@ganil.fr, Massara, A.1 (AUTHOR), Giovannini, M.3,4 (AUTHOR), Campostrini, M.5 (AUTHOR), Rigato, V.5 (AUTHOR), Calvo, D.6 (AUTHOR), Capirossi, V.5,6 (AUTHOR), Cappuzzello, F.1,7 (AUTHOR), Cavallaro, M.1 (AUTHOR), Delaunay, F.1,7,8 (AUTHOR), Pinna, F.5,6 (AUTHOR), Soukeras, V.1 (AUTHOR), Ursino, M.1 (AUTHOR)
Source: European Physical Journal A -- Hadrons & Nuclei. Jun2025, Vol. 61 Issue 6, p1-7. 7p.
Subjects: Rutherford backscattering spectrometry, Pyrolytic graphite, Physical & theoretical chemistry, Physical sciences, Substrates (Materials science)
Abstract: This paper reports on the production and characterisation of thin targets of natural molybdenum deposited on highly oriented pyrolytic graphite substrates at different temperatures. The targets were characterised using alpha-particle spectroscopy, Rutherford backscattering spectrometry and scanning electron microscopy. These techniques were used to measure the molybdenum and substrate thicknesses, the molybdenum purity and to evaluate the overall uniformity of the target thickness over an area of several mm 2 , which is a crucial parameter in heavy ion-induced nuclear reactions when high energy resolution is required. The present work shows that substrate heating is fundamental to reduce post-evaporation stresses and delamination effects typical of molybdenum deposition, which lead to significant non-uniformities in the surface of the target. Moreover, this study evidences how a careful characterisation of the thickness uniformity of the graphite backings is required to adequately match the resolution requirements of the NUMEN experiment. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal A -- Hadrons & Nuclei is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Production and characterisation of molybdenum/HOPG thin targets for the NUMEN experiment.
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+A+--+Hadrons+%26+Nuclei%22">European Physical Journal A -- Hadrons & Nuclei</searchLink>. Jun2025, Vol. 61 Issue 6, p1-7. 7p.
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  Data: This paper reports on the production and characterisation of thin targets of natural molybdenum deposited on highly oriented pyrolytic graphite substrates at different temperatures. The targets were characterised using alpha-particle spectroscopy, Rutherford backscattering spectrometry and scanning electron microscopy. These techniques were used to measure the molybdenum and substrate thicknesses, the molybdenum purity and to evaluate the overall uniformity of the target thickness over an area of several mm 2 , which is a crucial parameter in heavy ion-induced nuclear reactions when high energy resolution is required. The present work shows that substrate heating is fundamental to reduce post-evaporation stresses and delamination effects typical of molybdenum deposition, which lead to significant non-uniformities in the surface of the target. Moreover, this study evidences how a careful characterisation of the thickness uniformity of the graphite backings is required to adequately match the resolution requirements of the NUMEN experiment. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of European Physical Journal A -- Hadrons & Nuclei is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1140/epja/s10050-025-01617-2
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        Text: English
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    Subjects:
      – SubjectFull: Rutherford backscattering spectrometry
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      – SubjectFull: Pyrolytic graphite
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              Text: Jun2025
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