Lifetime measurements of yrast states in 178Pt using the charge plunger method with a recoil separator

J. Heery; L. Barber; J. Vilhena; B.S. Nara Singh; R.-D. Herzberg; D.M. Cullen; C. Müller-Gatermann; G. Beeton; M. Bowry; A. Dewald; T. Grahn; P.T. Greenlees; A. Illana; R. Julin; S. Juutinen; J.M. Keatings; M. Leino; M. Luoma; D. O'Donnell; J. Ojala; J. Pakarinen; P. Rahkila; P. Ruotslainen; M. Sandzelius; J. Sarén; J. Sinclair; J. F.  Smith; J. Sorri; P. Spagnoletti; H. Tann; J. Uusitalo; G. Zimba

doi:10.1140/epja/s10050-021-00425-8

Lifetime measurements of yrast states in ¹⁷⁸Pt using the charge plunger method with a recoil separator

J. Heery, L. Barber, J. Vilhena, B.S. Nara Singh, R.-D. Herzberg, D.M. Cullen, C. Müller-Gatermann, G. Beeton, M. Bowry, A. Dewald, T. Grahn, P.T. Greenlees, A. Illana, R. Julin, S. Juutinen, J.M. Keatings, M. Leino, M. Luoma, D. O'Donnell, J. OjalaJ. Pakarinen, P. Rahkila, P. Ruotslainen, M. Sandzelius, J. Sarén, J. Sinclair, J. F. Smith, J. Sorri, P. Spagnoletti, H. Tann, J. Uusitalo, G. Zimba

School of Computing, Engineering and Physical Sciences

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Abstract

Lifetime measurements in ¹⁷⁸Pt with excited states de-exciting through γ-ray transitions and internal electron conversions have been performed. Ionic charges were selected by the in-flight mass separator MARA and measured at the focal plane in coincidence with the 4⁺₁ → 2⁺₁ 257 keV γ-ray transition detected using the JUROGAM 3 spectrometer. The resulting charge-state distributions were analysed using the differential decay curve method (DDCM) framework to obtain a lifetime value of 430(20) ps for the 2⁺₁ state. This work builds on a method that combines the charge plunger technique with the DDCM analysis. As an alternative analysis, ions were selected in coincidence with the ¹⁷⁸Pt alpha decay (E_alpha = 5.458(5) MeV) at the focal plane. Lifetime information was obtained by fitting a two-state Bateman equation to the decay curve with the lifetime of individual states defined by a single quadrupole moment. This yielded a lifetime value of 430(50) ps for the 2⁺₁ state, and 54(6) ps for the 4⁺₁ state. An analysis method based around the Bateman equation will become especially important when using the charge plunger method for the cases where utilising coincidences between prompt γ rays and recoils is not feasible.

Original language	English
Article number	132
Number of pages	11
Journal	The European Physical Journal A
Volume	57
DOIs	https://doi.org/10.1140/epja/s10050-021-00425-8
Publication status	Published - 16 Apr 2021

Keywords

plunger
charger plunger
excited state lifetimes
DDCM
Bateman fit

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10.1140/epja/s10050-021-00425-8Licence: CC BY

2021 03 07 Heery et al Lifetime finalFinal published version, 965 KBLicence: CC BY

Cite this

Heery, J., Barber, L., Vilhena, J., Nara Singh, B. S., Herzberg, R.-D., Cullen, D. M., Müller-Gatermann, C., Beeton, G., Bowry, M., Dewald, A., Grahn, T., Greenlees, P. T., Illana, A., Julin, R., Juutinen, S., Keatings, J. M., Leino, M., Luoma, M., O'Donnell, D., ... Zimba, G. (2021). Lifetime measurements of yrast states in ¹⁷⁸Pt using the charge plunger method with a recoil separator. The European Physical Journal A, 57, Article 132. https://doi.org/10.1140/epja/s10050-021-00425-8

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title = "Lifetime measurements of yrast states in 178Pt using the charge plunger method with a recoil separator",

abstract = " Lifetime measurements in 178Pt with excited states de-exciting through γ-ray transitions and internal electron conversions have been performed. Ionic charges were selected by the in-flight mass separator MARA and measured at the focal plane in coincidence with the 4+1 → 2+1 257 keV γ-ray transition detected using the JUROGAM 3 spectrometer. The resulting charge-state distributions were analysed using the differential decay curve method (DDCM) framework to obtain a lifetime value of 430(20) ps for the 2+1 state. This work builds on a method that combines the charge plunger technique with the DDCM analysis. As an alternative analysis, ions were selected in coincidence with the 178Pt alpha decay (Ealpha = 5.458(5) MeV) at the focal plane. Lifetime information was obtained by fitting a two-state Bateman equation to the decay curve with the lifetime of individual states defined by a single quadrupole moment. This yielded a lifetime value of 430(50) ps for the 2+1 state, and 54(6) ps for the 4+1 state. An analysis method based around the Bateman equation will become especially important when using the charge plunger method for the cases where utilising coincidences between prompt γ rays and recoils is not feasible.",

keywords = "plunger, charger plunger, excited state lifetimes, DDCM, Bateman fit",

author = "J. Heery and L. Barber and J. Vilhena and {Nara Singh}, B.S. and R.-D. Herzberg and D.M. Cullen and C. M{\"u}ller-Gatermann and G. Beeton and M. Bowry and A. Dewald and T. Grahn and P.T. Greenlees and A. Illana and R. Julin and S. Juutinen and J.M. Keatings and M. Leino and M. Luoma and D. O'Donnell and J. Ojala and J. Pakarinen and P. Rahkila and P. Ruotslainen and M. Sandzelius and J. Sar{\'e}n and J. Sinclair and Smith, {J. F.} and J. Sorri and P. Spagnoletti and H. Tann and J. Uusitalo and G. Zimba",

year = "2021",

month = apr,

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doi = "10.1140/epja/s10050-021-00425-8",

language = "English",

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journal = "The European Physical Journal A",

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Heery, J, Barber, L, Vilhena, J, Nara Singh, BS, Herzberg, R-D, Cullen, DM, Müller-Gatermann, C, Beeton, G, Bowry, M, Dewald, A, Grahn, T, Greenlees, PT, Illana, A, Julin, R, Juutinen, S, Keatings, JM, Leino, M, Luoma, M, O'Donnell, D, Ojala, J, Pakarinen, J, Rahkila, P, Ruotslainen, P, Sandzelius, M, Sarén, J, Sinclair, J, Smith, JF, Sorri, J, Spagnoletti, P, Tann, H, Uusitalo, J & Zimba, G 2021, 'Lifetime measurements of yrast states in ¹⁷⁸Pt using the charge plunger method with a recoil separator', The European Physical Journal A, vol. 57, 132. https://doi.org/10.1140/epja/s10050-021-00425-8

TY - JOUR

T1 - Lifetime measurements of yrast states in 178Pt using the charge plunger method with a recoil separator

AU - Heery, J.

AU - Barber, L.

AU - Vilhena, J.

AU - Nara Singh, B.S.

AU - Herzberg, R.-D.

AU - Cullen, D.M.

AU - Müller-Gatermann, C.

AU - Beeton, G.

AU - Bowry, M.

AU - Dewald, A.

AU - Grahn, T.

AU - Greenlees, P.T.

AU - Illana, A.

AU - Julin, R.

AU - Juutinen, S.

AU - Keatings, J.M.

AU - Leino, M.

AU - Luoma, M.

AU - O'Donnell, D.

AU - Ojala, J.

AU - Pakarinen, J.

AU - Rahkila, P.

AU - Ruotslainen, P.

AU - Sandzelius, M.

AU - Sarén, J.

AU - Sinclair, J.

AU - Smith, J. F.

AU - Sorri, J.

AU - Spagnoletti, P.

AU - Tann, H.

AU - Uusitalo, J.

AU - Zimba, G.

PY - 2021/4/16

Y1 - 2021/4/16

N2 - Lifetime measurements in 178Pt with excited states de-exciting through γ-ray transitions and internal electron conversions have been performed. Ionic charges were selected by the in-flight mass separator MARA and measured at the focal plane in coincidence with the 4+1 → 2+1 257 keV γ-ray transition detected using the JUROGAM 3 spectrometer. The resulting charge-state distributions were analysed using the differential decay curve method (DDCM) framework to obtain a lifetime value of 430(20) ps for the 2+1 state. This work builds on a method that combines the charge plunger technique with the DDCM analysis. As an alternative analysis, ions were selected in coincidence with the 178Pt alpha decay (Ealpha = 5.458(5) MeV) at the focal plane. Lifetime information was obtained by fitting a two-state Bateman equation to the decay curve with the lifetime of individual states defined by a single quadrupole moment. This yielded a lifetime value of 430(50) ps for the 2+1 state, and 54(6) ps for the 4+1 state. An analysis method based around the Bateman equation will become especially important when using the charge plunger method for the cases where utilising coincidences between prompt γ rays and recoils is not feasible.

AB - Lifetime measurements in 178Pt with excited states de-exciting through γ-ray transitions and internal electron conversions have been performed. Ionic charges were selected by the in-flight mass separator MARA and measured at the focal plane in coincidence with the 4+1 → 2+1 257 keV γ-ray transition detected using the JUROGAM 3 spectrometer. The resulting charge-state distributions were analysed using the differential decay curve method (DDCM) framework to obtain a lifetime value of 430(20) ps for the 2+1 state. This work builds on a method that combines the charge plunger technique with the DDCM analysis. As an alternative analysis, ions were selected in coincidence with the 178Pt alpha decay (Ealpha = 5.458(5) MeV) at the focal plane. Lifetime information was obtained by fitting a two-state Bateman equation to the decay curve with the lifetime of individual states defined by a single quadrupole moment. This yielded a lifetime value of 430(50) ps for the 2+1 state, and 54(6) ps for the 4+1 state. An analysis method based around the Bateman equation will become especially important when using the charge plunger method for the cases where utilising coincidences between prompt γ rays and recoils is not feasible.

KW - plunger

KW - charger plunger

KW - excited state lifetimes

KW - DDCM

KW - Bateman fit

U2 - 10.1140/epja/s10050-021-00425-8

DO - 10.1140/epja/s10050-021-00425-8

M3 - Article

SN - 1434-6001

VL - 57

JO - The European Physical Journal A

JF - The European Physical Journal A

M1 - 132

ER -