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. Marginean, N. Marginean, 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. Saren, J. Sorri, S. Stolze, J. Uusitalo, P.H. Regan, Zs. Podolyák, S. Lalkovski, J.F. Smith, M. Smolen

Research output: Contribution to journalArticle

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 g 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 g 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 Kpi=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
Early online date9 Apr 2019
DOIs
Publication statusE-pub ahead of print - 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

  • 138Gd
  • Nuclear-state lifetimes
  • Fast-timing
  • Distributed source
  • Generalised-centroid-difference method
  • LaBr3 detectors

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. ; Marginean, R. ; Marginean, 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. ; Saren, 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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title = "A time-of-flight correction procedure for fast-timing data of recoils with varying implantation positions at a spectrometer focal plane",
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 g 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 g 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 Kpi=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 = "M.J. Mallaburn and {Nara Singh}, B.S. and D.M. Cullen and D. Hodge and M.J. Taylor and M.M. Giles and L. Barber and C.R. Niţă and R.E. Mihai and C. Mihai and R. Marginean and N. Marginean and C.R. Nobs and E.R. Gamba and A.M. Bruce and C. Scholey and P. Rahkila and P.T. Greenlees and H. Badran and T. Grahn and O. Neuvonen and K. Auranen and F. Bisso and D.M. Cox and A. Herz{\'a}ň and R. Julin and J. Konki and A.K. Lightfoot and J. Pakarinen and P. Papadakis and J. Partanen and M. Sandzelius and J. Saren and J. Sorri and S. Stolze and J. Uusitalo and P.H. Regan and Zs. Podoly{\'a}k and S. Lalkovski and J.F. Smith 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, Marginean, R, Marginean, 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, Saren, 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.; Marginean, R.; Marginean, 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.; Saren, 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, 21.07.2019, p. 18-29.

Research output: Contribution to journalArticle

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 - Marginean, R.

AU - Marginean, 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 - Saren, 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 g 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 g 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 Kpi=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 g 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 g 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 Kpi=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 - 138Gd

KW - Nuclear-state lifetimes

KW - Fast-timing

KW - Distributed source

KW - Generalised-centroid-difference method

KW - LaBr3 detectors

U2 - 10.1016/j.nima.2019.04.019

DO - 10.1016/j.nima.2019.04.019

M3 - Article

VL - 933

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 -