New cross-section data for proton-induced reactions on natTi and natCu with special regard to the beam monitoring

doi:10.1016/j.nimb.2020.08.006

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Volume 480, 1 October 2020, Pages 78-97

https://doi.org/10.1016/j.nimb.2020.08.006 Get rights and content

Abstract

Excitation functions of the reactions ^natTi(p,x)⁴⁸V, ⁴³Sc, ^44gSc, ^44mSc, ^46m+gSc, ⁴⁷Sc, ⁴⁸Sc and ^natCu(p,x)⁶²Zn, ⁶³Zn, ⁶⁵Zn, ⁶¹Cu, ^58m+gCo were measured in the energy interval of 6.4–36.0 MeV (titanium) and 7.3–35.9 MeV (copper) with use of stacked-foil technique and off-line γ-ray spectrometry. The results were compared with previously published experimental data and with prediction of the nuclear reaction model code TALYS adopted from the TENDL-2019 online library. Thick target yields were calculated from the obtained cross-sections. Finally, we fit the selected experimental data sets for the ^natTi(p,x)⁴⁸V and ^natCu(p,x)^62,63,65Zn reactions and compare the results with the IAEA recommended cross-sections.

Introduction

Nuclear reactions of charged particles on metals easily available as thin foils of even thickness and forming well measurable radionuclides are suitable for cyclotron beam monitoring. Among them, proton-induced reactions on aluminium, titanium and copper resulting in sodium, vanadium, scandium, zinc and cobalt isotopes are the most widespread. For such a purpose, precise knowledge of their excitation functions is inevitable. Reasonable amount of sound experimental data is required for construction of recommended cross-sections for the beam monitoring [1], and more independent measurements contribute to their reliability and gradual improvement.

We have, therefore, carefully re-measured excitation functions of proton-induced reactions on titanium and copper. Part of these unpublished data was already provided in a private communication for deducing recommended cross-sections [1]. In this work, we present complete experimental material.

Section snippets

Target and irradiation

The cross-sections were measured using well-established stacked foil method followed by off-line γ-ray spectrometry. Two stacks of metal foils were irradiated on the external proton beam of cyclotron U-120 M in the Nuclear Physics Institute of the CAS. Both stacks contained ten ^natMo foils (99.9%, 19.3 μm thick, Goodfellow, GB), ten ^natCu foils (99.9%, 10.6 μm thick, Goodfellow, GB), eleven ^natTi foils (99.6%, 11.0 μm thick, Alfa Aesar, USA) and some ^natCu foils (55.9 μm thick) acting as energy

Beam energy and current

Proton beam energy deduced from the precisely measured beam orbit position was 36.00 ± 0.30 MeV and 21.35 ± 0.30 MeV respectively for the 1st and 2nd stack of foils. The beam current obtained from continuous recording of the proton beam was 1.230 μA for the 1st stack and 0.5078 μA for the 2nd stack of foils. These values were used for calculation of cross-sections without any further correction and their estimated uncertainty was 6%. The data obtained from both irradiations are well consistent

Conclusion

In this paper, we present new measurement of excitation functions for the ^natTi(p,x)⁴⁸V, ⁴³Sc, ^44gSc, ^44mSc, ^46m+gSc, ⁴⁷Sc, ⁴⁸Sc reactions in the energy range 6.4–36.0 MeV, and for the ^natCu(p,x)⁶²Zn, ⁶³Zn, ⁶⁵Zn, ⁶¹Cu, ^58m+gCo reactions in the energy range of 7.3–35.9 MeV. Our cross-sections were compared with previously published experimental data and with prediction of the nuclear reaction model code TALYS adopted from the TENDL-2019 online library. We calculated thick target yields for all

CRediT authorship contribution statement

Jaroslav Červenák: Methodology, Data curation, Writing - original draft. Ondřej Lebeda: Supervision, Conceptualization, Methodology, Writing - review & editing.

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgements

The authors are grateful to the crew of the U-120M cyclotron for the irradiations and to Dr. Petr Hanč and Anton Cvíčela for the help with the γ-ray spectra measurements. The work was supported by the IAEA Coordinated Research Project “Nuclear Data for Charged-Particle Monitor Reactions and Medical Isotope Production” under the contract no. 17461, by the Czech Academy of Sciences under the NPI research plan AV0Z10480505 and the irradiations were carried out at the CANAM infrastructure of the

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New cross-section data for proton-induced reactions on natTi and natCu with special regard to the beam monitoring

Abstract

Introduction

Section snippets

Target and irradiation

Beam energy and current

Conclusion

CRediT authorship contribution statement

Declaration of Competing Interest

Acknowledgements

Nucl. Data Sheets

Nucl. Inst. Methods Phys. Res. B

Nucl. Inst. Methods Phys. Res.

J. Inorg. Nucl. Chem.

Nucl. Inst. Methods Phys. Res. B

Appl. Radiat. Isot.

Nucl. Inst. Methods Phys. Res. B

Nucl. Inst. Methods Phys. Res. B

Nucl. Inst. Methods Phys. Res. B

Appl. Radiat. Isot.

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Nucl. Inst. Methods Phys. Res. B

Nucl. Inst. Methods Phys. Res. B

Appl. Radiat. Isot.

Appl. Radiat. Isot.

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Appl. Radiat. Isot.

Nucl. Inst. Methods Phys. Res. B

Nucl. Inst. Methods Phys. Res.

Int. J. Appl. Radiat. Isot.

Nucl. Inst. Methods Phys. Res.B

Program DEIMOS32 for gamma-ray spectra evaluation

J. Radioanal. Nucl. Chem.

New cross-section data for proton-induced reactions on ^natTi and ^natCu with special regard to the beam monitoring