Treatment of background in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll" id="d1e3311" altimg="si33.gif"><mml:mi>γ</mml:mi></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll" id="d1e3316" altimg="si33.gif"><mml:mi>γ</mml:mi></mml:math> fast-timing measurements

Gamba, E. R.; Bruce, A. M.; Rüdigier, M.

doi:10.1016/j.nima.2019.03.028

Cited by 18 publications

(17 citation statements)

References 17 publications

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“…The background correction applied on the time information followed the three samples approach described in Ref. [32].…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

“…In order to background correct the value of the centroid position C m p|p (where the label m stands for measured) of the delayed and antidelayed time distributions, the three samples approach explained in Ref. [32] was used. The interpolation approach was avoided due to the large number of contaminant peaks.…”

mentioning

confidence: 99%

“…In order to take into account the energydependent time walk affecting the centroid position of each background time distribution, these were corrected for the Compton time walk obtained from the Compton curve (see Ref. [32]) before being used in Eq. (3).…”

mentioning

confidence: 99%

“…These are used to correct for the effect of the time walk on the position of the centroids of the FEP (p|p) and background (p|bg, bg|p and bg|bg) time distributions, respectively. See Refs [31,32]. for a complete description of the properties of these two curves.…”

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confidence: 99%

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Fast-timing measurements in the ground-state band of Pd114

Gamba¹,

Bruce²,

Lalkovski³

et al. 2019

Phys. Rev. C

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Using a hybrid Gammasphere array coupled to 25 LaBr 3 (Ce) detectors, the lifetimes of the first three levels of the yrast band in 114 Pd, populated via 252 Cf decay, have been measured. The measured lifetimes are τ 2 + = 103(10) ps, τ 4 + = 22(13) ps, and τ 6 + 10 ps for the 2 + 1 , 4 + 1 , and 6 + 1 levels, respectively. Palladium-114 was predicted to be the most deformed isotope of its isotopic chain, and spectroscopic studies have suggested it might also be a candidate nucleus for low-spin stable triaxiality. From the lifetimes measured in this work, reduced transition probabilities B(E 2; J → J − 2) are calculated and compared with interacting boson model, projected shell model, and collective model calculations from the literature. The experimental ratio R B(E 2) = B(E 2; 4 + 1 → 2 + 1)/B(E 2; 2 + 1 → 0 + 1) = 0.80(42) is measured for the first time in 114 Pd and compared with the known values R B(E 2) in the palladium isotopic chain: the systematics suggest that, for N = 68, a transition from γ-unstable to a more rigid γ-deformed nuclear shape occurs.

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“…The background correction applied on the time information followed the three samples approach described in Ref. [32].…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Fast-timing measurements in the ground-state band of Pd114

Gamba¹,

Bruce²,

Lalkovski³

et al. 2019

Phys. Rev. C

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show abstract

“…When using the centroid shift method, corrections for the background present in the LaBr 3 energy gates have to be applied, using the correction method described in Ref. [32], where,…”

Section: Lifetime Measurement Techniquesmentioning

confidence: 99%

Half-life measurements in Dy164,166 using γ−γ fast-timing spectroscopy with the
Canavan¹,
Rudigier²,
Regan³
et al. 2020
Phys. Rev. C
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We report on the measurement of lifetimes of excited states in the near-mid-shell nuclei 164,166 Dy using the gamma-ray coincidence fast-timing method. The nuclei of interest were populated using reactions between an 18 O beam and a gold-backed isotopically enriched 164 Dy target of thickness 6.3 mg/cm 2 at primary beam energies of 71, 76, and 80 MeV from the IPN-Orsay laboratory, France. Excited states were populated in 164 Dy, 166 Dy, and 178,179 W following Coulomb excitation, inelastic nuclear scattering, two-neutron transfer, and fusionevaporation reaction channels respectively. Gamma rays from excited states were measured using the ν-Ball high-purity germanium (HPGe)-LaBr 3 hybrid γ-ray spectrometer with the excited state lifetimes extracted using the fast-timing coincidence method using HPGe-gated LaBr 3-LaBr 3 triple coincident events. The lifetime of the first I π = 2 + excited state in 166 Dy was used to determine the transition quadrupole deformation of this neutron-rich nucleus for the first time. The experimental methodology was validated by showing consistency with previously determined excited state lifetimes in 164 Dy. The half-lives of the yrast 2 + states in 164 Dy and 166 Dy were 2.35(6) and 2.3(2) ns, respectively, corresponding to transition quadrupole moment values of Q 0 = 7.58(9) and 7.5(4) eb, respectively. The lifetime of the yrast 2 + state in 166 Dy is consistent with a quenching of nuclear quadrupole deformation at β ≈ 0.35 as the N = 104 mid-shell is approached.

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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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Treatment of background in γ-γ fast-timing measurements

Cited by 18 publications

References 17 publications

Fast-timing measurements in the ground-state band of Pd114

Fast-timing measurements in the ground-state band of Pd114

Half-life measurements in Dy164,166 using γ−γ fast-timing spectroscopy with the
Canavan¹,
Rudigier²,
Regan³
et al. 2020
Phys. Rev. C
Self Cite

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

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Treatment of background in γ-γ fast-timing measurements

Cited by 18 publications

References 17 publications

Fast-timing measurements in the ground-state band of Pd114

Fast-timing measurements in the ground-state band of Pd114

Half-life measurements in Dy164,166 using γ−γ fast-timing spectroscopy with the Canavan1, Rudigier2, Regan3 et al. 2020Phys. Rev. CSelf Cite

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

Contact Info

Product

Resources

About

Half-life measurements in Dy164,166 using γ−γ fast-timing spectroscopy with the
Canavan¹,
Rudigier²,
Regan³
et al. 2020
Phys. Rev. C
Self Cite