A method for picosecond lifetime measurements for neutron-rich nuclei

Mach, H.; Gill, R. L.; Moszyński, M.

doi:10.1016/0168-9002(89)91272-2

Cited by 218 publications

(139 citation statements)

References 17 publications

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“…The γ -ray detectors included two fast-response LaBr 3 (Ce) scintillators in the shape of truncated cones (38.1 mm in height, 38.1 mm diameter at the bottom, and 25.4 mm diameter at the entrance window), which were coupled to the Photonis XP20D0 photomultipliers, as well as two high-purity germanium (HPGe) detectors with relative efficiencies of 60%. The experimental setup and data collection were optimized for the application of the ATD βγ γ (t) method described in [14,15,29], so only a few details are given below.…”

Section: Methodsmentioning

confidence: 99%

“…The lifetime measurements in subnanosecond range were performed using the βγ γ (t) method [14,15,29]. The timedelayed βγ (t) coincidences were started by a signal from the β detector and stopped by one of the LaBr 3 (Ce) γ detectors.…”

Section: A Time-response Calibrations Of the Scintillator Detectorsmentioning

confidence: 99%

“…The advanced time-delayed (ATD) βγ γ (t) method [14,15] has been employed to measure excited level lifetimes in the subnanosecond range. Prior to this study, there was scarce information on the β decay of 65 Mn and on the levels in 65 Fe.…”

Section: Introductionmentioning

confidence: 99%

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β−decay of65Mn to65Fe

et al. 2013

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The low-energy structure of 65 Fe has been studied by means of γ and fast-timing spectroscopy at the ISOLDE facility, CERN. A level scheme of 65 Fe populated following the β − decay of 65 Mn was established for the first time. It includes 41 levels and 85 transitions. The excitation energy of the β-decaying isomer in 65 Fe has been precisely determined at 393.7(2) keV. The β-delayed neutron emission branch was measured as P n = 7.9(12)%, which cannot be reconciled with the previously reported value of 21.0(5)%. Four γ rays and four excited states in 64 Fe were identified as being populated following the β-n decay. Four lifetimes and five lifetime limits in the subnanosecond range have been measured using the advanced time-delayed βγ γ (t) method. The level scheme is compared with shell-model calculations. Tentative spin and parity assignments are proposed based on the observed transition rates, the calculations, and the systematics of the region.

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Section: Methodsmentioning

confidence: 99%

Section: A Time-response Calibrations Of the Scintillator Detectorsmentioning

confidence: 99%

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β−decay of65Mn to65Fe

et al. 2013

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“…The second setup using the LaBr 3 detectors was dedicated to lifetime measurements. In this configuration, the EXOGAM detectors are used to select the fragment of interest and the LaBr 3 crystals give the lifetimes via the electronics fast timing technique using LaBr 3 -LaBr 3 coincidences [10][11][12][13]. This method requires therefore Ge-LaBr 3 -LaBr 3 or Ge-Ge-LaBr 3 -LaBr 3 coincidences.…”

Section: Setupsmentioning

confidence: 99%

EXOGAM at the ILL: the EXILL campaign

et al. 2018

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Abstract. Radiative capture reactions on rare targets and prompt spectroscopy of neutron-rich nuclei produced in the neutron-capture induced-fission of 235 U and 241 Pu have been performed at the Institut Laue-Langevin (ILL). The highefficiency germanium (Ge) EXOGAM array has been used, complemented with Ge detectors from GASP and the ILL. LaBr 3 detectors from the FATIMA collaboration have also been coupled to EXOGAM to measure lifetimes of lowlying excited states. The measured characteristics indicate very good performances of the overall setup. Some recent results will be discussed.

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“…The electronic fast-timing technique in combination with very fast scintillator detectors is picosecond sensitive [1][2][3] and therefore is capable of overlapping with complementary techniques such as the Recoil Distance Method [4] and Coulomb excia e-mail: regis@ikp.uni-koeln.de tation [5]. For the picosecond regime, the fast-timing technique is based on the determination of centroids of time distributions (first moment of a time spectrum [6]) generated as time difference spectra of consecutive γ-γ transitions measured using two start and stop γ-ray detectors.…”

Section: Introductionmentioning

confidence: 99%

The Generalized Centroid Difference method for lifetime measurements viaγ-γcoincidences using large fast-timing arrays

Régis

Jolie

Mach

et al. 2015

EPJ Web of Conferences

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Abstract.A novel method for direct electronic "fast-timing" lifetime measurements of nuclear excited states via γ-γ coincidences using an array equipped with N very fast high-resolution LaBr 3 (Ce) scintillator detectors is presented. The generalized centroid difference method provides two independent "start" and "stop" time spectra obtained without any correction by a superposition of the N(N − 1)/2 calibrated γ-γ time difference spectra of the N detector fast-timing system. The two fast-timing array time spectra correspond to a forward and reverse gating of a specific γ-γ cascade and the centroid difference as the time shift between the centroids of the two time spectra provides a picosecond-sensitive mirror-symmetric observable of the set-up. The energydependent mean prompt response difference between the start and stop events is calibrated and used as a single correction for lifetime determination. These combined fast-timing array mean γ-γ zero-time responses can be determined for 40 keV < E γ < 1.4 MeV with a precision better than 10 ps using a 152 Eu γ-ray source. The new method is described with examples of (n,γ) and (n,f,γ) experiments performed at the intense cold-neutron beam facility PF1B of the Institut Laue-Langevin in Grenoble, France, using 16 LaBr 3 (Ce) detectors within the EXILL&FATIMA campaign in 2013. The results are discussed with respect to possible systematic errors induced by background contributions.

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A method for picosecond lifetime measurements for neutron-rich nuclei

Cited by 218 publications

References 17 publications

β−decay of65Mn to65Fe

β−decay of65Mn to65Fe

EXOGAM at the ILL: the EXILL campaign

The Generalized Centroid Difference method for lifetime measurements viaγ-γcoincidences using large fast-timing arrays

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