Germanium-gated γ–γ fast timing of excited states in fission fragments using the EXILL&amp;FATIMA spectrometer

Régis, J.-M.; Simpson, G. S.; Blanc, A.; Jentschel, M.; Köster, U.; Mutti, P.; Paziy, V.; Saed-Samii, N.; Söldner, T.; Ur, C. A.; Urban, W.; Bruce, A. M.; Drouet, F.; Fraile, L. M.; Ilieva, S.; Jolie, J.; Körten, W.; Kroll, Thilo; Lalkovski, S.; Mach, H.; Mărginean, N.; Pascovici, G.; Podolyák, Zs.; Regan, P.H.; Roberts, O. J.; Smith, J. F.; Townsley, C.; Vancraeyenest, A.; Warr, N.

doi:10.1016/j.nima.2014.06.004

Cited by 64 publications

(65 citation statements)

References 36 publications

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“…[15]. Further tests and new measurements on short lifetimes down to the limit of about 10 ps also confirmed the method [13,[16][17][18].…”

Section: The Gcd Methods For Exillandfatimasupporting

confidence: 54%

“…A detailed description of the EXILL&FATIMA set-up is given in Ref. [13]. In a preparatory work, the The fast-timing data of the 96 unique detector-detector combinations (time spectra TAC i j ) are superimposed without any correction by distinguishing between the delayed (decay transition detected as stop signal) and the anti-delayed time spectrum of a γ-γ cascade to measure the centroid difference.…”

Section: The Gcd Methods For Exillandfatimamentioning

confidence: 99%

“…Fig. 3 shows the (mean) PRD curve of the FATIMA plus the electronics set-up that was calibrated using γ-γ cascades from a standard 152 Eu γ-ray source and the in-beam reaction 48 Ti(n,γ) 49 Ti [13]. Some 82% of the data are nearly free of background due to the use of an additional EXILL (Ge) gate to select a triple γ-ray cascade.…”

Section: The Gcd Methods For Exillandfatimamentioning

confidence: 99%

“…Some 82% of the data are nearly free of background due to the use of an additional EXILL (Ge) gate to select a triple γ-ray cascade. For the EX-ILL&FATIMA experiments, a PRD uncertainty of 10 ps has been achieved which includes possible systematic errors [13]. Figure 3.…”

Section: The Gcd Methods For Exillandfatimamentioning

confidence: 99%

“…Taking into account the peak-to-background ratio Π = 2.6(2) of the 352-keV peak in the FATIMA LaBr 3 coincidence spectrum shown in Fig. 4a, the net γ-γ centroid difference ΔC net is derived from the time shift [here +649 (20) ps] between the measured centroid difference and the γ-Compton time response ΔC Compton at 352 keV using [3,13]:…”

Section: The Gcd Methods For Exillandfatimamentioning

confidence: 99%

See 4 more Smart Citations

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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“…[15]. Further tests and new measurements on short lifetimes down to the limit of about 10 ps also confirmed the method [13,[16][17][18].…”

Section: The Gcd Methods For Exillandfatimasupporting

confidence: 54%

Section: The Gcd Methods For Exillandfatimamentioning

confidence: 99%

Section: The Gcd Methods For Exillandfatimamentioning

confidence: 99%

Section: The Gcd Methods For Exillandfatimamentioning

confidence: 99%

Section: The Gcd Methods For Exillandfatimamentioning

confidence: 99%

See 3 more Smart Citations

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

Self Cite

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Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

2022

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The paper reviews recent developments in $$\gamma $$ γ -ray spectroscopy of the neutron-rich fragments produced in nuclear fission. This subject has been an intensive area of study spanning more than five decades. Here we highlight key results and describe the evolution of the associated experimental techniques since the last review papers in 1995 (I. Ahmad and W.R. Phillips, Rep. Prog. Phys. 58(11), 1415 (1995); J. H. Hamilton et al., Prog. Part. Nucl. Phys. 35, 635(1995)). Research themes in nuclear structure will be explored along with the fission reaction mechanism and the links to nuclear astrophysics and applications.

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CsI-bowl: an ancillary detector for exit channel selection in γ-ray spectroscopy experiments

Han,

Wang,

et al. 2023

NUCL SCI TECH

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Germanium-gated γ–γ fast timing of excited states in fission fragments using the EXILL&FATIMA spectrometer

Cited by 64 publications

References 36 publications

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

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

Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

CsI-bowl: an ancillary detector for exit channel selection in γ-ray spectroscopy experiments

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