New AMS method to measure the atom ratio 146Sm/147Sm for a half-life determination of 146Sm

N. Kinoshita; M. Paul; M. Alcorta; M. Bowers; P. Collon; C. M. Deibel; B. Digiovine; S. Goriely; J. P. Greene; D. J. Henderson; C. L. Jiang; Y. Kashiv; B. P. Kay; H. Y. Lee; S. T. Marley; T. Nakanishi; R. C. Pardo; N. Patel; K. E. Rehm; D. Robertson; R. Scott; C. Schmitt; X. D. Tang; C. Ugalde; R. Vondrasek

doi:10.1016/j.nimb.2012.01.013

New AMS method to measure the atom ratio ¹⁴⁶Sm/¹⁴⁷Sm for a half-life determination of ¹⁴⁶Sm

N. Kinoshita, M. Paul^*, M. Alcorta, M. Bowers, P. Collon, C. M. Deibel, B. Digiovine, S. Goriely, J. P. Greene, D. J. Henderson, C. L. Jiang, Y. Kashiv, B. P. Kay, H. Y. Lee, S. T. Marley, T. Nakanishi, R. C. Pardo, N. Patel, K. E. Rehm, D. RobertsonR. Scott, C. Schmitt, X. D. Tang, C. Ugalde, R. Vondrasek

^*Corresponding author for this work

Racah Institute of Physics

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

2 Scopus citations

Abstract

The extinct p-process nuclide ¹⁴⁶Sm (t_1/2 = 103 ± 5 Myr) is known to have been present in the Early-Solar System and has been proposed as an astrophysical chronometer. ¹⁴⁶Sm is also intensely used to date meteorite and planetary differentiation processes, enhancing the importance of an accurate knowledge of the ¹⁴⁶Sm half-life. We are engaged in a new determination of the ¹⁴⁶Sm half-life in which the ¹⁴⁶Sm/¹⁴⁷Sm atom ratio is determined by accelerator mass spectrometry at the ATLAS facility of Argonne National Laboratory. In order to reduce systematic errors in the AMS determination of the ¹⁴⁶Sm/¹⁴⁷Sm ratios (in the range of 10^-7-10^-9), ¹⁴⁶Sm and ¹⁴⁷Sm ions were alternately counted in the same detector in the focal plane of a gas-filled magnet, respectively in continuous-wave and attenuated mode. Quantitative attenuation is obtained with the 12 MHz pulsed and ns-bunched ATLAS beam by chopping beam pulses with an RF sweeper in a ratio (digitally determined) down to 1:10⁶. The experiments and preliminary results are discussed.

Original language	English
Pages (from-to)	143-146
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	294
DOIs	https://doi.org/10.1016/j.nimb.2012.01.013
State	Published - Jan 2013

Keywords

Accelerator mass spectrometry
ECR ion source
Sm
Superconducting linear accelerator

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Kinoshita, N., Paul, M., Alcorta, M., Bowers, M., Collon, P., Deibel, C. M., Digiovine, B., Goriely, S., Greene, J. P., Henderson, D. J., Jiang, C. L., Kashiv, Y., Kay, B. P., Lee, H. Y., Marley, S. T., Nakanishi, T., Pardo, R. C., Patel, N., Rehm, K. E., ... Vondrasek, R. (2013). New AMS method to measure the atom ratio ¹⁴⁶Sm/¹⁴⁷Sm for a half-life determination of ¹⁴⁶Sm. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 294, 143-146. https://doi.org/10.1016/j.nimb.2012.01.013

@article{5e795618a67840c992c15e656a94b8d2,

title = "New AMS method to measure the atom ratio 146Sm/147Sm for a half-life determination of 146Sm",

abstract = "The extinct p-process nuclide 146Sm (t1/2 = 103 ± 5 Myr) is known to have been present in the Early-Solar System and has been proposed as an astrophysical chronometer. 146Sm is also intensely used to date meteorite and planetary differentiation processes, enhancing the importance of an accurate knowledge of the 146Sm half-life. We are engaged in a new determination of the 146Sm half-life in which the 146Sm/147Sm atom ratio is determined by accelerator mass spectrometry at the ATLAS facility of Argonne National Laboratory. In order to reduce systematic errors in the AMS determination of the 146Sm/147Sm ratios (in the range of 10-7-10-9), 146Sm and 147Sm ions were alternately counted in the same detector in the focal plane of a gas-filled magnet, respectively in continuous-wave and attenuated mode. Quantitative attenuation is obtained with the 12 MHz pulsed and ns-bunched ATLAS beam by chopping beam pulses with an RF sweeper in a ratio (digitally determined) down to 1:106. The experiments and preliminary results are discussed.",

keywords = "Accelerator mass spectrometry, ECR ion source, Sm, Superconducting linear accelerator",

author = "N. Kinoshita and M. Paul and M. Alcorta and M. Bowers and P. Collon and Deibel, {C. M.} and B. Digiovine and S. Goriely and Greene, {J. P.} and Henderson, {D. J.} and Jiang, {C. L.} and Y. Kashiv and Kay, {B. P.} and Lee, {H. Y.} and Marley, {S. T.} and T. Nakanishi and Pardo, {R. C.} and N. Patel and Rehm, {K. E.} and D. Robertson and R. Scott and C. Schmitt and Tang, {X. D.} and C. Ugalde and R. Vondrasek",

year = "2013",

month = jan,

doi = "10.1016/j.nimb.2012.01.013",

language = "אנגלית",

volume = "294",

pages = "143--146",

journal = "Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms",

issn = "0168-583X",

publisher = "Elsevier B.V.",

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Kinoshita, N, Paul, M, Alcorta, M, Bowers, M, Collon, P, Deibel, CM, Digiovine, B, Goriely, S, Greene, JP, Henderson, DJ, Jiang, CL, Kashiv, Y, Kay, BP, Lee, HY, Marley, ST, Nakanishi, T, Pardo, RC, Patel, N, Rehm, KE, Robertson, D, Scott, R, Schmitt, C, Tang, XD, Ugalde, C & Vondrasek, R 2013, 'New AMS method to measure the atom ratio ¹⁴⁶Sm/¹⁴⁷Sm for a half-life determination of ¹⁴⁶Sm', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 294, pp. 143-146. https://doi.org/10.1016/j.nimb.2012.01.013

TY - JOUR

T1 - New AMS method to measure the atom ratio 146Sm/147Sm for a half-life determination of 146Sm

AU - Kinoshita, N.

AU - Paul, M.

AU - Alcorta, M.

AU - Bowers, M.

AU - Collon, P.

AU - Deibel, C. M.

AU - Digiovine, B.

AU - Goriely, S.

AU - Greene, J. P.

AU - Henderson, D. J.

AU - Jiang, C. L.

AU - Kashiv, Y.

AU - Kay, B. P.

AU - Lee, H. Y.

AU - Marley, S. T.

AU - Nakanishi, T.

AU - Pardo, R. C.

AU - Patel, N.

AU - Rehm, K. E.

AU - Robertson, D.

AU - Scott, R.

AU - Schmitt, C.

AU - Tang, X. D.

AU - Ugalde, C.

AU - Vondrasek, R.

PY - 2013/1

Y1 - 2013/1

N2 - The extinct p-process nuclide 146Sm (t1/2 = 103 ± 5 Myr) is known to have been present in the Early-Solar System and has been proposed as an astrophysical chronometer. 146Sm is also intensely used to date meteorite and planetary differentiation processes, enhancing the importance of an accurate knowledge of the 146Sm half-life. We are engaged in a new determination of the 146Sm half-life in which the 146Sm/147Sm atom ratio is determined by accelerator mass spectrometry at the ATLAS facility of Argonne National Laboratory. In order to reduce systematic errors in the AMS determination of the 146Sm/147Sm ratios (in the range of 10-7-10-9), 146Sm and 147Sm ions were alternately counted in the same detector in the focal plane of a gas-filled magnet, respectively in continuous-wave and attenuated mode. Quantitative attenuation is obtained with the 12 MHz pulsed and ns-bunched ATLAS beam by chopping beam pulses with an RF sweeper in a ratio (digitally determined) down to 1:106. The experiments and preliminary results are discussed.

AB - The extinct p-process nuclide 146Sm (t1/2 = 103 ± 5 Myr) is known to have been present in the Early-Solar System and has been proposed as an astrophysical chronometer. 146Sm is also intensely used to date meteorite and planetary differentiation processes, enhancing the importance of an accurate knowledge of the 146Sm half-life. We are engaged in a new determination of the 146Sm half-life in which the 146Sm/147Sm atom ratio is determined by accelerator mass spectrometry at the ATLAS facility of Argonne National Laboratory. In order to reduce systematic errors in the AMS determination of the 146Sm/147Sm ratios (in the range of 10-7-10-9), 146Sm and 147Sm ions were alternately counted in the same detector in the focal plane of a gas-filled magnet, respectively in continuous-wave and attenuated mode. Quantitative attenuation is obtained with the 12 MHz pulsed and ns-bunched ATLAS beam by chopping beam pulses with an RF sweeper in a ratio (digitally determined) down to 1:106. The experiments and preliminary results are discussed.

KW - Accelerator mass spectrometry

KW - ECR ion source

KW - Sm

KW - Superconducting linear accelerator

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SN - 0168-583X

VL - 294

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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 -

New AMS method to measure the atom ratio ¹⁴⁶Sm/¹⁴⁷Sm for a half-life determination of ¹⁴⁶Sm

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Keywords

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