TPEN: a triple-foil differential plunger for lifetime measurements of excited states in exotic nuclei

M.M. Giles; D.M. Cullen; L. Barber; B.S. Nara Singh; M.J. Taylor; A.J. Smith; A. McFarlane; C. Read; T. Grahn; H. Badran; P.T. Greenlees; R. Julin; J. Pakarinen; J. Partanen; P. Rahkila; P. Ruotsalainen; M. Sandzelius; J. Saren; J. Sorri; S.V. Szwec; J. Uusitalo; J. Heery; E. Parr; P. Papadakis; R.D. Herzberg

doi:10.1016/j.nima.2019.01.089

TPEN: a triple-foil differential plunger for lifetime measurements of excited states in exotic nuclei

M.M. Giles, D.M. Cullen, L. Barber, B.S. Nara Singh, M.J. Taylor, A.J. Smith, A. McFarlane, C. Read, T. Grahn, H. Badran, P.T. Greenlees, R. Julin, J. Pakarinen, J. Partanen, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Saren, J. Sorri, S.V. SzwecJ. Uusitalo, J. Heery, E. Parr, P. Papadakis, R.D. Herzberg

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Abstract

A Triple-foil differential Plunger for Exotic Nuclei (TPEN) has been developed to measure the lifetimes of excited states in nuclei with small production cross-sections. TPEN utilises one target foil and two degrader foils to make differential lifetime measurements: directly determining the decay function and its derivative at a single plunger distance setting. The direct measurement of the decay function and its derivative removes the requirement to measure γ-ray intensities at several target-to-degrader distances, thereby reducing the beam-time required relative to a conventional plunger with a single-degrader foil. This paper describes the commissioning of TPEN in the lifetime measurement of the first excited 4⁺ state in ¹⁵⁶Dy using this differential lifetime technique. The 46(2) ps measured lifetime was found to be in good agreement with the 45.6(5) ps deduced from a previous high-statistics experiment using a conventional two-foil plunger. A comparison between the differential mode with TPEN, and that using TPEN as a conventional two-foil plunger reveals that it achieves the same statistical accuracy with a 4-fold reduction in beam-time in the differential mode, for the reaction and experimental setup used in this work. TPEN opens up new opportunities to study exotic nuclei with lower production cross-sections that were previously not accessible.

Original language	English
Pages (from-to)	139-146
Number of pages	8
Journal	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	923
Early online date	4 Feb 2019
DOIs	https://doi.org/10.1016/j.nima.2019.01.089
Publication status	Published - 11 Apr 2019
Externally published	Yes

Keywords

Plunger
Triple-foil plunger
Excited-state lifetimes
156Dy
RDDS
DDCM

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2019 01 28 Giles et al TPENAccepted author manuscript, 5.59 MBLicence: CC BY-NC-ND

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Giles, M. M., Cullen, D. M., Barber, L., Nara Singh, B. S., Taylor, M. J., Smith, A. J., McFarlane, A., Read, C., Grahn, T., Badran, H., Greenlees, P. T., Julin, R., Pakarinen, J., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Sorri, J., ... Herzberg, R. D. (2019). TPEN: a triple-foil differential plunger for lifetime measurements of excited states in exotic nuclei. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 923, 139-146. https://doi.org/10.1016/j.nima.2019.01.089

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title = "TPEN: a triple-foil differential plunger for lifetime measurements of excited states in exotic nuclei",

abstract = "A Triple-foil differential Plunger for Exotic Nuclei (TPEN) has been developed to measure the lifetimes of excited states in nuclei with small production cross-sections. TPEN utilises one target foil and two degrader foils to make differential lifetime measurements: directly determining the decay function and its derivative at a single plunger distance setting. The direct measurement of the decay function and its derivative removes the requirement to measure γ-ray intensities at several target-to-degrader distances, thereby reducing the beam-time required relative to a conventional plunger with a single-degrader foil. This paper describes the commissioning of TPEN in the lifetime measurement of the first excited 4+ state in 156Dy using this differential lifetime technique. The 46(2) ps measured lifetime was found to be in good agreement with the 45.6(5) ps deduced from a previous high-statistics experiment using a conventional two-foil plunger. A comparison between the differential mode with TPEN, and that using TPEN as a conventional two-foil plunger reveals that it achieves the same statistical accuracy with a 4-fold reduction in beam-time in the differential mode, for the reaction and experimental setup used in this work. TPEN opens up new opportunities to study exotic nuclei with lower production cross-sections that were previously not accessible.",

keywords = "Plunger, Triple-foil plunger, Excited-state lifetimes, 156Dy, RDDS, DDCM",

author = "M.M. Giles and D.M. Cullen and L. Barber and {Nara Singh}, B.S. and M.J. Taylor and A.J. Smith and A. McFarlane and C. Read and T. Grahn and H. Badran and P.T. Greenlees and R. Julin and J. Pakarinen and J. Partanen and P. Rahkila and P. Ruotsalainen and M. Sandzelius and J. Saren and J. Sorri and S.V. Szwec and J. Uusitalo and J. Heery and E. Parr and P. Papadakis and R.D. Herzberg",

year = "2019",

month = apr,

day = "11",

doi = "10.1016/j.nima.2019.01.089",

language = "English",

volume = "923",

pages = "139--146",

journal = "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

issn = "0168-9002",

publisher = "Elsevier B.V.",

}

Giles, MM, Cullen, DM, Barber, L, Nara Singh, BS, Taylor, MJ, Smith, AJ, McFarlane, A, Read, C, Grahn, T, Badran, H, Greenlees, PT, Julin, R, Pakarinen, J, Partanen, J, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Sorri, J, Szwec, SV, Uusitalo, J, Heery, J, Parr, E, Papadakis, P & Herzberg, RD 2019, 'TPEN: a triple-foil differential plunger for lifetime measurements of excited states in exotic nuclei', Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 923, pp. 139-146. https://doi.org/10.1016/j.nima.2019.01.089

TPEN: a triple-foil differential plunger for lifetime measurements of excited states in exotic nuclei. / Giles, M.M.; Cullen, D.M.; Barber, L. et al.
In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 923, 11.04.2019, p. 139-146.

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

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T2 - a triple-foil differential plunger for lifetime measurements of excited states in exotic nuclei

AU - Giles, M.M.

AU - Cullen, D.M.

AU - Barber, L.

AU - Nara Singh, B.S.

AU - Taylor, M.J.

AU - Smith, A.J.

AU - McFarlane, A.

AU - Read, C.

AU - Grahn, T.

AU - Badran, H.

AU - Greenlees, P.T.

AU - Julin, R.

AU - Pakarinen, J.

AU - Partanen, J.

AU - Rahkila, P.

AU - Ruotsalainen, P.

AU - Sandzelius, M.

AU - Saren, J.

AU - Sorri, J.

AU - Szwec, S.V.

AU - Uusitalo, J.

AU - Heery, J.

AU - Parr, E.

AU - Papadakis, P.

AU - Herzberg, R.D.

PY - 2019/4/11

Y1 - 2019/4/11

N2 - A Triple-foil differential Plunger for Exotic Nuclei (TPEN) has been developed to measure the lifetimes of excited states in nuclei with small production cross-sections. TPEN utilises one target foil and two degrader foils to make differential lifetime measurements: directly determining the decay function and its derivative at a single plunger distance setting. The direct measurement of the decay function and its derivative removes the requirement to measure γ-ray intensities at several target-to-degrader distances, thereby reducing the beam-time required relative to a conventional plunger with a single-degrader foil. This paper describes the commissioning of TPEN in the lifetime measurement of the first excited 4+ state in 156Dy using this differential lifetime technique. The 46(2) ps measured lifetime was found to be in good agreement with the 45.6(5) ps deduced from a previous high-statistics experiment using a conventional two-foil plunger. A comparison between the differential mode with TPEN, and that using TPEN as a conventional two-foil plunger reveals that it achieves the same statistical accuracy with a 4-fold reduction in beam-time in the differential mode, for the reaction and experimental setup used in this work. TPEN opens up new opportunities to study exotic nuclei with lower production cross-sections that were previously not accessible.

AB - A Triple-foil differential Plunger for Exotic Nuclei (TPEN) has been developed to measure the lifetimes of excited states in nuclei with small production cross-sections. TPEN utilises one target foil and two degrader foils to make differential lifetime measurements: directly determining the decay function and its derivative at a single plunger distance setting. The direct measurement of the decay function and its derivative removes the requirement to measure γ-ray intensities at several target-to-degrader distances, thereby reducing the beam-time required relative to a conventional plunger with a single-degrader foil. This paper describes the commissioning of TPEN in the lifetime measurement of the first excited 4+ state in 156Dy using this differential lifetime technique. The 46(2) ps measured lifetime was found to be in good agreement with the 45.6(5) ps deduced from a previous high-statistics experiment using a conventional two-foil plunger. A comparison between the differential mode with TPEN, and that using TPEN as a conventional two-foil plunger reveals that it achieves the same statistical accuracy with a 4-fold reduction in beam-time in the differential mode, for the reaction and experimental setup used in this work. TPEN opens up new opportunities to study exotic nuclei with lower production cross-sections that were previously not accessible.

KW - Plunger

KW - Triple-foil plunger

KW - Excited-state lifetimes

KW - 156Dy

KW - RDDS

KW - DDCM

U2 - 10.1016/j.nima.2019.01.089

DO - 10.1016/j.nima.2019.01.089

M3 - Article

SN - 0168-9002

VL - 923

SP - 139

EP - 146

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

ER -

Giles MM, Cullen DM, Barber L, Nara Singh BS, Taylor MJ, Smith AJ et al. TPEN: a triple-foil differential plunger for lifetime measurements of excited states in exotic nuclei. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2019 Apr 11;923:139-146. Epub 2019 Feb 4. doi: 10.1016/j.nima.2019.01.089

TPEN: a triple-foil differential plunger for lifetime measurements of excited states in exotic nuclei

Abstract

Keywords

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