Measurement of total and partial cross sections of the $$^{90}$$Zr(p,$$\gamma $$)$$^{91}$$Nb reaction with in-beam $$\gamma $$-ray spectroscopy

Medientyp: E-Artikel
Titel: Measurement of total and partial cross sections of the $$^{90}$$Zr(p,$$\gamma $$)$$^{91}$$Nb reaction with in-beam $$\gamma $$-ray spectroscopy
Beteiligte: Erbacher, Philipp; Heftrich, Tanja; Endres, Anne; Glorius, Jan; Netterdon, Lars; Just, David; Göbel, Kathrin; Krtička, Milan; Reifarth, René; Sonnabend, Kerstin; Thomas, Benedikt; Weigand, Mario; Zilges, Andreas
Erschienen: Springer Science and Business Media LLC, 2023
Erschienen in: The European Physical Journal A
Sprache: Englisch
DOI: 10.1140/epja/s10050-023-00984-y
ISSN: 1434-601X
Schlagwörter: Nuclear and High Energy Physics
Entstehung:
Anmerkungen:
Beschreibung: <jats:title>Abstract</jats:title><jats:p>The origin of many p-nuclei remains an unsolved problem in nuclear astrophysics. While photo-dissociation reactions in the <jats:inline-formula><jats:alternatives><jats:tex-math>$$\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>-process can explain the production of many p-nuclei, some, notably <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{92,94}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mn>92</mml:mn> <mml:mo>,</mml:mo> <mml:mn>94</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Mo and <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{96,98}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mn>96</mml:mn> <mml:mo>,</mml:mo> <mml:mn>98</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Ru are underproduced in network calculations. The <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{90}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>90</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Zr(p,<jats:inline-formula><jats:alternatives><jats:tex-math>$$\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>)<jats:inline-formula><jats:alternatives><jats:tex-math>$$^{91}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>91</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Nb reaction is part of a possible (p,<jats:inline-formula><jats:alternatives><jats:tex-math>$$\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>) reaction chain for the production of the p-nucleus <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{92}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>92</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Mo. Available data show a large disagreement between the different reported cross sections measurements for the <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{90}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>90</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Zr(p,<jats:inline-formula><jats:alternatives><jats:tex-math>$$\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>)<jats:inline-formula><jats:alternatives><jats:tex-math>$$^{91}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>91</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Nb reaction. We measured proton capture cross sections with an enriched <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{90}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>90</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Zr target using in-beam <jats:inline-formula><jats:alternatives><jats:tex-math>$$\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>-ray spectroscopy for proton energies between 2.75 MeV and 5.1 MeV. The emitted <jats:inline-formula><jats:alternatives><jats:tex-math>$$\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>-rays were detected using the HORUS (<jats:bold>H</jats:bold>igh efficiency <jats:bold>O</jats:bold>bservatory for <jats:inline-formula><jats:alternatives><jats:tex-math>$$\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>-<jats:bold>R</jats:bold>ay <jats:bold>U</jats:bold>nique <jats:bold>S</jats:bold>pectroscopy) detector array at the University of Cologne, Germany. To account for the possible contribution of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{91}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>91</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Zr(p,n) reaction, an enriched <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{91}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>91</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Zr was irradiated. We measured production cross sections for the ground and isomeric state of <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{91}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>91</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>Nb as well as partial cross section for up to ten high-energy primary transitions. The results are in good agreement with a former in-beam <jats:inline-formula><jats:alternatives><jats:tex-math>$$\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>-ray spectroscopy measurement by Laird et al.. We provide a possible explanation for the discrepancies between our data and other available measurements.</jats:p>

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