Beta decay studies with total absorption spectroscopy and the<i>Lucrecia</i>spectrometer at ISOLDE

Rubio, B.; Gelletly, W.; Algora, A.; Nácher, E.; Taı́n, J. L.

doi:10.1088/1361-6471/aa797f

Cited by 20 publications

(10 citation statements)

References 84 publications

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“…In comparison with the Lucrecia spectrometer at ISOLDE [20] and the LBNL spectrometer at GSI [21], both single crystal spectrometers, the efficiency of the present eighteen module configura- tion is similar. When compared with the recently built MTAS spectrometer [28] our peak efficiency is 9% smaller at 1 MeV and 25% smaller at 3 MeV.…”

Section: Validation Of MC Simulationsmentioning

confidence: 67%

“…Taking into account the different ways that 3 × M γ electrons can be distributed in M m modules one can determine that the apparent energy shifts follow approximately the numbers in Table 1. The first row in the table corresponds to the behaviour of a single NaI(Tl) crystal spectrometer like LUCRECIA at ISOLDE [20] or the LBNL spectrometer used at GSI [21].…”

Section: Software Summentioning

confidence: 99%

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Characterization and performance of the DTAS detector

Guadilla

Taín

Algora

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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DTAS is a segmented total absorption γ-ray spectrometer developed for the DESPEC experiment at FAIR. It is composed of up to eighteen NaI(Tl) crystals. In this work we study the performance of this detector with laboratory sources and also under real experimental conditions. We present a procedure to reconstruct offline the sum of the energy deposited in all the crystals of the spectrometer, which is complicated by the effect of NaI(Tl) light-yield non-proportionality. The use of a system to correct for time variations of the gain in individual detector modules, based on a light pulse generator, is demonstrated. We describe also an event-based method to evaluate the summing-pileup electronic distortion in segmented spectrometers. All of this allows a careful characterization of the detector with Monte Carlo simulations that is needed to calculate the response function for the analysis of total absorption γ-ray spectroscopy data. Special attention was paid to the interaction of neutrons with the spectrometer, since they are a source of contamination in studies of β-delayed neutron emitting nuclei. sponding increase in level density implies, on the one hand, the fragmentation of the β feeding into many levels populated in the decay and, on the other hand, the fragmentation of the γ intensity between many possible cascades. Total Absorption γ-Ray Spectroscopy (TAGS) has been shown to be an accurate tool to determine β-decay intensity distributions for such nuclei far from the valley of β stability. This technique avoids the so-called Pandemonium effect [2], related to the relatively poor efficiency of HPGe detectors. Instead of detecting individual γ rays as in high-resolution exper-

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Section: Validation Of MC Simulationsmentioning

confidence: 67%

Section: Software Summentioning

confidence: 99%

Characterization and performance of the DTAS detector

Guadilla

Taín

Algora

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…The use of the TAGS method began at ISOLDE [14]. Its development and history are described in [15,16].…”

Section: Introductionmentioning

confidence: 99%

Beta-decay studies for applied and basic nuclear physics

Algora,

Tain,

Rubio

et al. 2020

Preprint

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In this review we will present the results of recent beta-decay studies using the total absorption technique that cover topics of interest for applications, nuclear structure and astrophysics. The decays studied were selected primarily because they have a large impact on the prediction of a) the decay heat in reactors, important for the safety of present and future reactors and b) the reactor electron antineutrino spectrum, of interest for particle/nuclear physics and reactor monitoring. For these studies the total absorption technique was chosen, since it is the only method that allows one to obtain beta decay probabilities free from a systematic error called the Pandemonium effect. The total absorption technique is based on the detection of the gamma cascades that follow the initial beta decay. For this reason the technique requires the use of calorimeters with very high gamma detection efficiency. The measurements presented and discussed here were performed mainly at the IGISOL facility of the University of Jyväskylä (Finland) using isotopically pure beams provided by the JYFLTRAP Penning trap. Examples are presented to show that the results of our measurements on selected nuclei have had a large impact on predictions of both the decay heat and the anti-neutrino spectrum from reactors. Some of the cases involve betadelayed neutron emission thus one can study the competition between gamma-and neutron-emission from states above the neutron separation energy. The gamma-to-neutron emission ratios can be used to constrain neutron capture (n,γ) cross sections for unstable nuclei of interest in astrophysics. The information obtained from the measurements can also be used to test nuclear model predictions of half-lives and Pn values for decays of interest in astrophysical network calculations. These comparisons also provide insights into aspects of nuclear structure in particular regions of the nuclear chart.PACS. 21.10.Pc Single-particle levels and strength functions -23.40.s β decay; double β decay; electron and muon capture -26.50.+x Nuclear physics aspects of novae, supernovae, and other explosive environments -29.30.h Spectrometers and spectroscopic techniques -29.90.+r Other topics in elementary-particle and nuclear physics experimental methods and instrumentation

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“…This experimental difficulty is known in the literature as the Pandemonium effect [10]. It can be avoided using the Total Absorption γ-ray Spectroscopy (TAGS) technique, which relies on the use of γ-ray calorimeters to detect the full γ cascades that follow the β decay [11,12]. The potential of using the TAGS technique in β decay measurements important for reactor calculations has already been demonstrated [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Total absorption γ -ray spectroscopy of niobium isomers

Guadilla¹,

Algora²,

Taín³

et al. 2019

Phys. Rev. C

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The β intensity distributions of the decays of 100gs,100m Nb and 102gs,102m Nb have been determined using the Total Absorption γ-Ray Spectroscopy technique. The JYFLTRAP double Penning trap system was employed to disentangle the isomeric states involved, lying very close in energy, in a campaign of challenging measurements performed with the Decay Total Absorption γ-ray Spectrometer at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. The low-spin isomeric state of each niobium case was populated through the decay of the zirconium parent, that was treated as a contaminant. We have applied a method to extract this contamination, and additionally we have obtained β intensity distributions for these zirconium decays. The β-strength distributions evaluated with these results were compared with calculations in quasiparticle random-phase approximation, suggesting a prolate configuration for the ground states of 100,102 Zr. The footprint of the Pandemonium effect was found when comparing our results for the analyses of the niobium isotopes with previous decay data. The β-intensities of the decay of 102m Nb were obtained for the first time. A careful evaluation of the uncertainties was carried out, and the consistency of our results was validated taking advantage of the segmentation of our spectrometer. The final results were used as input in reactor summation calculations. A large impact on antineutrino spectrum calculations was already reported and here we detail the significant impact on decay heat calculations.

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Beta decay studies with total absorption spectroscopy and theLucreciaspectrometer at ISOLDE

Cited by 20 publications

References 84 publications

Characterization and performance of the DTAS detector

Characterization and performance of the DTAS detector

Beta-decay studies for applied and basic nuclear physics

Total absorption γ -ray spectroscopy of niobium isomers

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