Scavenger hunt: Searching for the optimal target material for low-level 210Pb accelerator mass spectrometry

M. B. Froehlich; Z. Slavkovská; D. Koll; S. Pavetich; F. Dastgiri; L. K. Fifield; M. A.C. Hotchkis; S. Merchel; S. G. Tims; A. Wallner

doi:10.1016/j.nimb.2022.08.015

Scavenger hunt: Searching for the optimal target material for low-level ²¹⁰Pb accelerator mass spectrometry

M. B. Froehlich^*, Z. Slavkovská, D. Koll, S. Pavetich, F. Dastgiri, L. K. Fifield, M. A.C. Hotchkis, S. Merchel, S. G. Tims, A. Wallner

^*Corresponding author for this work

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2 Citations (Scopus)

Abstract

The Centre of Excellence for Dark Matter Particle Physics aims to measure ²¹⁰Pb (half-life of 22.2 years) in 1 kg of NaI via accelerator mass spectrometry (AMS) for the SABRE (Sodium iodide with Active Background REjection) South dark matter experiment. The first step is to find the optimal target material (chemical compound and binder) to produce the highest and most stable negative ion output. We initially studied the outputs from Pb₃O₄, PbO and PbF₂ mixed 1:2 with Ag. The ²⁰⁸PbO₂⁻ and ²⁰⁸PbF₃⁻ currents were 0.5–1.2 μA with the procedural PbF₂ compound performing slightly better. Based on these results, we explored the performance of PbF₂ mixed with fluorinating agents such as AgF, AgF₂ and SbF₃ at different ratios. The 1:1 mixture was the best for all additives. The possibility of using either Fe (oxide/fluoride) or NaF as bulk material for the AMS target was also studied, however, none proved suitable.

Original language	English
Pages (from-to)	18-23
Number of pages	6
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	529
DOIs	https://doi.org/10.1016/j.nimb.2022.08.015
Publication status	Published - 15 Oct 2022

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Froehlich, M. B., Slavkovská, Z., Koll, D., Pavetich, S., Dastgiri, F., Fifield, L. K., Hotchkis, M. A. C., Merchel, S., Tims, S. G., & Wallner, A. (2022). Scavenger hunt: Searching for the optimal target material for low-level ²¹⁰Pb accelerator mass spectrometry. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 529, 18-23. https://doi.org/10.1016/j.nimb.2022.08.015

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title = "Scavenger hunt: Searching for the optimal target material for low-level 210Pb accelerator mass spectrometry",

abstract = "The Centre of Excellence for Dark Matter Particle Physics aims to measure 210Pb (half-life of 22.2 years) in 1 kg of NaI via accelerator mass spectrometry (AMS) for the SABRE (Sodium iodide with Active Background REjection) South dark matter experiment. The first step is to find the optimal target material (chemical compound and binder) to produce the highest and most stable negative ion output. We initially studied the outputs from Pb3O4, PbO and PbF2 mixed 1:2 with Ag. The 208PbO2− and 208PbF3− currents were 0.5–1.2 μA with the procedural PbF2 compound performing slightly better. Based on these results, we explored the performance of PbF2 mixed with fluorinating agents such as AgF, AgF2 and SbF3 at different ratios. The 1:1 mixture was the best for all additives. The possibility of using either Fe (oxide/fluoride) or NaF as bulk material for the AMS target was also studied, however, none proved suitable.",

keywords = "Accelerator mass spectrometry, AgF, Dark matter, Negative ion production, Pb, PbF matrix",

author = "Froehlich, {M. B.} and Z. Slavkovsk{\'a} and D. Koll and S. Pavetich and F. Dastgiri and Fifield, {L. K.} and Hotchkis, {M. A.C.} and S. Merchel and Tims, {S. G.} and A. Wallner",

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year = "2022",

month = oct,

day = "15",

doi = "10.1016/j.nimb.2022.08.015",

language = "English",

volume = "529",

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Froehlich, MB , Slavkovská, Z, Koll, D, Pavetich, S, Dastgiri, F, Fifield, LK, Hotchkis, MAC, Merchel, S, Tims, SG & Wallner, A 2022, 'Scavenger hunt: Searching for the optimal target material for low-level ²¹⁰Pb accelerator mass spectrometry', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 529, pp. 18-23. https://doi.org/10.1016/j.nimb.2022.08.015

Scavenger hunt: Searching for the optimal target material for low-level ²¹⁰Pb accelerator mass spectrometry. / Froehlich, M. B.; Slavkovská, Z.; Koll, D. et al.
In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 529, 15.10.2022, p. 18-23.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Scavenger hunt

T2 - Searching for the optimal target material for low-level 210Pb accelerator mass spectrometry

AU - Froehlich, M. B.

AU - Slavkovská, Z.

AU - Koll, D.

AU - Pavetich, S.

AU - Dastgiri, F.

AU - Fifield, L. K.

AU - Hotchkis, M. A.C.

AU - Merchel, S.

AU - Tims, S. G.

AU - Wallner, A.

PY - 2022/10/15

Y1 - 2022/10/15

N2 - The Centre of Excellence for Dark Matter Particle Physics aims to measure 210Pb (half-life of 22.2 years) in 1 kg of NaI via accelerator mass spectrometry (AMS) for the SABRE (Sodium iodide with Active Background REjection) South dark matter experiment. The first step is to find the optimal target material (chemical compound and binder) to produce the highest and most stable negative ion output. We initially studied the outputs from Pb3O4, PbO and PbF2 mixed 1:2 with Ag. The 208PbO2− and 208PbF3− currents were 0.5–1.2 μA with the procedural PbF2 compound performing slightly better. Based on these results, we explored the performance of PbF2 mixed with fluorinating agents such as AgF, AgF2 and SbF3 at different ratios. The 1:1 mixture was the best for all additives. The possibility of using either Fe (oxide/fluoride) or NaF as bulk material for the AMS target was also studied, however, none proved suitable.

AB - The Centre of Excellence for Dark Matter Particle Physics aims to measure 210Pb (half-life of 22.2 years) in 1 kg of NaI via accelerator mass spectrometry (AMS) for the SABRE (Sodium iodide with Active Background REjection) South dark matter experiment. The first step is to find the optimal target material (chemical compound and binder) to produce the highest and most stable negative ion output. We initially studied the outputs from Pb3O4, PbO and PbF2 mixed 1:2 with Ag. The 208PbO2− and 208PbF3− currents were 0.5–1.2 μA with the procedural PbF2 compound performing slightly better. Based on these results, we explored the performance of PbF2 mixed with fluorinating agents such as AgF, AgF2 and SbF3 at different ratios. The 1:1 mixture was the best for all additives. The possibility of using either Fe (oxide/fluoride) or NaF as bulk material for the AMS target was also studied, however, none proved suitable.

KW - Accelerator mass spectrometry

KW - AgF

KW - Dark matter

KW - Negative ion production

KW - Pb

KW - PbF matrix

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U2 - 10.1016/j.nimb.2022.08.015

DO - 10.1016/j.nimb.2022.08.015

M3 - Article

SN - 0168-583X

VL - 529

SP - 18

EP - 23

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

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

ER -

Scavenger hunt: Searching for the optimal target material for low-level ²¹⁰Pb accelerator mass spectrometry

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