A time-of-flight correction procedure for fast-timing data of recoils with varying implantation positions at a spectrometer focal plane

M. J. Mallaburn, B. S. Nara Singh, D. M. Cullen, D. Hodge, M. J. Taylor, M. M. Giles, L. Barber, C. R. Niţă, R. E. Mihai, C. Mihai, R. Mărginean, N. Mărginean, C. R. Nobs, E. R. Gamba, A. M. Bruce, C. Scholey, P. Rahkila, P. T. Greenlees, H. Badran, T. Grahn & 21 others O. Neuvonen, K. Auranen, F. Bisso, D. M. Cox, A. Herzáň, R. Julin, J. Konki, A. K. Lightfoot, J. Pakarinen, P. Papadakis, J. Partanen, M. Sandzelius, J. Sarén, J. Sorri, S. Stolze, J. Uusitalo, P. H. Regan, Zs Podolyák, S. Lalkovski, J. F. Smith, M. Smolen

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Fast-timing measurements at the focal plane of a separator can suffer from poor timing resolution. This is due to the variations in time-of-flight (ToF) for photons travelling to a given detector, which arise from the changes in the implantation positions of the recoil nuclei emitting the γ rays of interest. In order to minimise these effects on timing measurements, a procedure is presented that improves fast-timing data by performing ToF corrections on an event-by-event basis. This method was used to correct data collected with an array of eight LaBr3 detectors, which detected γ rays from spatially distributed 138Gd recoil-implants at the focal plane of the Recoil-Ion-Transport-Unit (RITU) spectrometer. The Generalised Centroid Difference (GCD) method was used to extract a lifetime from data in conjunction with a new procedure to calibrate the time walk. The lifetime of the first 2+ state in 138Gd, populated by the decay of the Kπ=8 isomeric state, was measured to be 229(24) ps using the ToF-corrected data, which is consistent within three standard deviations to the literature value. The results together with Monte-Carlo simulations show that the ToF correction procedure reduced the uncertainty in the measured lifetimes by 3 % in the case of the spatially distributed nuclei at the focal plane of RITU. However, ∼12 % has been estimated for a similar experiment when using a larger focal plane i.e. the Super-FRS at the FAIR facility.

Original languageEnglish
Pages (from-to)18-29
Number of pages12
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume933
DOIs
Publication statusPublished - 9 Apr 2019

Fingerprint

Spectrometers
implantation
time measurement
spectrometers
Detectors
recoil ions
Ions
Separators
life (durability)
rays
Photons
nuclei
detectors
separators
centroids
standard deviation
Experiments
photons
decay
simulation

Keywords

  • Gd
  • Distributed source
  • Fast-timing
  • Generalised-centroid-difference method
  • LaBr detectors
  • Nuclear-state lifetimes

Cite this

Mallaburn, M. J. ; Nara Singh, B. S. ; Cullen, D. M. ; Hodge, D. ; Taylor, M. J. ; Giles, M. M. ; Barber, L. ; Niţă, C. R. ; Mihai, R. E. ; Mihai, C. ; Mărginean, R. ; Mărginean, N. ; Nobs, C. R. ; Gamba, E. R. ; Bruce, A. M. ; Scholey, C. ; Rahkila, P. ; Greenlees, P. T. ; Badran, H. ; Grahn, T. ; Neuvonen, O. ; Auranen, K. ; Bisso, F. ; Cox, D. M. ; Herzáň, A. ; Julin, R. ; Konki, J. ; Lightfoot, A. K. ; Pakarinen, J. ; Papadakis, P. ; Partanen, J. ; Sandzelius, M. ; Sarén, J. ; Sorri, J. ; Stolze, S. ; Uusitalo, J. ; Regan, P. H. ; Podolyák, Zs ; Lalkovski, S. ; Smith, J. F. ; Smolen, M. / A time-of-flight correction procedure for fast-timing data of recoils with varying implantation positions at a spectrometer focal plane. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2019 ; Vol. 933. pp. 18-29.
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abstract = "Fast-timing measurements at the focal plane of a separator can suffer from poor timing resolution. This is due to the variations in time-of-flight (ToF) for photons travelling to a given detector, which arise from the changes in the implantation positions of the recoil nuclei emitting the γ rays of interest. In order to minimise these effects on timing measurements, a procedure is presented that improves fast-timing data by performing ToF corrections on an event-by-event basis. This method was used to correct data collected with an array of eight LaBr3 detectors, which detected γ rays from spatially distributed 138Gd recoil-implants at the focal plane of the Recoil-Ion-Transport-Unit (RITU) spectrometer. The Generalised Centroid Difference (GCD) method was used to extract a lifetime from data in conjunction with a new procedure to calibrate the time walk. The lifetime of the first 2+ state in 138Gd, populated by the decay of the Kπ=8− isomeric state, was measured to be 229(24) ps using the ToF-corrected data, which is consistent within three standard deviations to the literature value. The results together with Monte-Carlo simulations show that the ToF correction procedure reduced the uncertainty in the measured lifetimes by 3 {\%} in the case of the spatially distributed nuclei at the focal plane of RITU. However, ∼12 {\%} has been estimated for a similar experiment when using a larger focal plane i.e. the Super-FRS at the FAIR facility.",
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author = "Mallaburn, {M. J.} and {Nara Singh}, {B. S.} and Cullen, {D. M.} and D. Hodge and Taylor, {M. J.} and Giles, {M. M.} and L. Barber and Niţă, {C. R.} and Mihai, {R. E.} and C. Mihai and R. Mărginean and N. Mărginean and Nobs, {C. R.} and Gamba, {E. R.} and Bruce, {A. M.} and C. Scholey and P. Rahkila and Greenlees, {P. T.} and H. Badran and T. Grahn and O. Neuvonen and K. Auranen and F. Bisso and Cox, {D. M.} and A. Herz{\'a}ň and R. Julin and J. Konki and Lightfoot, {A. K.} and J. Pakarinen and P. Papadakis and J. Partanen and M. Sandzelius and J. Sar{\'e}n and J. Sorri and S. Stolze and J. Uusitalo and Regan, {P. H.} and Zs Podoly{\'a}k and S. Lalkovski and Smith, {J. F.} and M. Smolen",
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Mallaburn, MJ, Nara Singh, BS, Cullen, DM, Hodge, D, Taylor, MJ, Giles, MM, Barber, L, Niţă, CR, Mihai, RE, Mihai, C, Mărginean, R, Mărginean, N, Nobs, CR, Gamba, ER, Bruce, AM, Scholey, C, Rahkila, P, Greenlees, PT, Badran, H, Grahn, T, Neuvonen, O, Auranen, K, Bisso, F, Cox, DM, Herzáň, A, Julin, R, Konki, J, Lightfoot, AK, Pakarinen, J, Papadakis, P, Partanen, J, Sandzelius, M, Sarén, J, Sorri, J, Stolze, S, Uusitalo, J, Regan, PH, Podolyák, Z, Lalkovski, S, Smith, JF & Smolen, M 2019, 'A time-of-flight correction procedure for fast-timing data of recoils with varying implantation positions at a spectrometer focal plane', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 933, pp. 18-29. https://doi.org/10.1016/j.nima.2019.04.019

A time-of-flight correction procedure for fast-timing data of recoils with varying implantation positions at a spectrometer focal plane. / Mallaburn, M. J.; Nara Singh, B. S.; Cullen, D. M.; Hodge, D.; Taylor, M. J.; Giles, M. M.; Barber, L.; Niţă, C. R.; Mihai, R. E.; Mihai, C.; Mărginean, R.; Mărginean, N.; Nobs, C. R.; Gamba, E. R.; Bruce, A. M.; Scholey, C.; Rahkila, P.; Greenlees, P. T.; Badran, H.; Grahn, T.; Neuvonen, O.; Auranen, K.; Bisso, F.; Cox, D. M.; Herzáň, A.; Julin, R.; Konki, J.; Lightfoot, A. K.; Pakarinen, J.; Papadakis, P.; Partanen, J.; Sandzelius, M.; Sarén, J.; Sorri, J.; Stolze, S.; Uusitalo, J.; Regan, P. H.; Podolyák, Zs; Lalkovski, S.; Smith, J. F.; Smolen, M.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 933, 09.04.2019, p. 18-29.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - A time-of-flight correction procedure for fast-timing data of recoils with varying implantation positions at a spectrometer focal plane

AU - Mallaburn, M. J.

AU - Nara Singh, B. S.

AU - Cullen, D. M.

AU - Hodge, D.

AU - Taylor, M. J.

AU - Giles, M. M.

AU - Barber, L.

AU - Niţă, C. R.

AU - Mihai, R. E.

AU - Mihai, C.

AU - Mărginean, R.

AU - Mărginean, N.

AU - Nobs, C. R.

AU - Gamba, E. R.

AU - Bruce, A. M.

AU - Scholey, C.

AU - Rahkila, P.

AU - Greenlees, P. T.

AU - Badran, H.

AU - Grahn, T.

AU - Neuvonen, O.

AU - Auranen, K.

AU - Bisso, F.

AU - Cox, D. M.

AU - Herzáň, A.

AU - Julin, R.

AU - Konki, J.

AU - Lightfoot, A. K.

AU - Pakarinen, J.

AU - Papadakis, P.

AU - Partanen, J.

AU - Sandzelius, M.

AU - Sarén, J.

AU - Sorri, J.

AU - Stolze, S.

AU - Uusitalo, J.

AU - Regan, P. H.

AU - Podolyák, Zs

AU - Lalkovski, S.

AU - Smith, J. F.

AU - Smolen, M.

PY - 2019/4/9

Y1 - 2019/4/9

N2 - Fast-timing measurements at the focal plane of a separator can suffer from poor timing resolution. This is due to the variations in time-of-flight (ToF) for photons travelling to a given detector, which arise from the changes in the implantation positions of the recoil nuclei emitting the γ rays of interest. In order to minimise these effects on timing measurements, a procedure is presented that improves fast-timing data by performing ToF corrections on an event-by-event basis. This method was used to correct data collected with an array of eight LaBr3 detectors, which detected γ rays from spatially distributed 138Gd recoil-implants at the focal plane of the Recoil-Ion-Transport-Unit (RITU) spectrometer. The Generalised Centroid Difference (GCD) method was used to extract a lifetime from data in conjunction with a new procedure to calibrate the time walk. The lifetime of the first 2+ state in 138Gd, populated by the decay of the Kπ=8− isomeric state, was measured to be 229(24) ps using the ToF-corrected data, which is consistent within three standard deviations to the literature value. The results together with Monte-Carlo simulations show that the ToF correction procedure reduced the uncertainty in the measured lifetimes by 3 % in the case of the spatially distributed nuclei at the focal plane of RITU. However, ∼12 % has been estimated for a similar experiment when using a larger focal plane i.e. the Super-FRS at the FAIR facility.

AB - Fast-timing measurements at the focal plane of a separator can suffer from poor timing resolution. This is due to the variations in time-of-flight (ToF) for photons travelling to a given detector, which arise from the changes in the implantation positions of the recoil nuclei emitting the γ rays of interest. In order to minimise these effects on timing measurements, a procedure is presented that improves fast-timing data by performing ToF corrections on an event-by-event basis. This method was used to correct data collected with an array of eight LaBr3 detectors, which detected γ rays from spatially distributed 138Gd recoil-implants at the focal plane of the Recoil-Ion-Transport-Unit (RITU) spectrometer. The Generalised Centroid Difference (GCD) method was used to extract a lifetime from data in conjunction with a new procedure to calibrate the time walk. The lifetime of the first 2+ state in 138Gd, populated by the decay of the Kπ=8− isomeric state, was measured to be 229(24) ps using the ToF-corrected data, which is consistent within three standard deviations to the literature value. The results together with Monte-Carlo simulations show that the ToF correction procedure reduced the uncertainty in the measured lifetimes by 3 % in the case of the spatially distributed nuclei at the focal plane of RITU. However, ∼12 % has been estimated for a similar experiment when using a larger focal plane i.e. the Super-FRS at the FAIR facility.

KW - Gd

KW - Distributed source

KW - Fast-timing

KW - Generalised-centroid-difference method

KW - LaBr detectors

KW - Nuclear-state lifetimes

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U2 - 10.1016/j.nima.2019.04.019

DO - 10.1016/j.nima.2019.04.019

M3 - Article

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SP - 18

EP - 29

JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

SN - 0168-9002

ER -