Experimental study of 
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>
 decay with total absorption 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math>
-ray spectroscopy

Guadilla, V.; Algora, A.; Taín, J. L.; Agramunt, J.; Jordán, D.; Montaner-Pizá, A.; Orrigo, S. E. A.; Rubio, B.; Valencia, E.; Suhonen, J.; Civitarese, O.; Äystö, J.; Briz, J. A.; Cucoanes, A.; Eronen, T.; Estienne, M.; Fallot, M.; Fraile, L. M.; Ganioğlu, E.; Gelletly, W.; Gorelov, D.; Hakala, J.; Jokinen, A.; Kankainen, A.; Kolhinen, V. S.; Koponen, J.; Lebois, M.; Martínez, T.; Monserrate, M.; Moore, I. D.; Nácher, E.; Penttilä, H.; Pohjalainen, I.; Porta, A.; Reinikainen, Juuso; Reponen, M.; Rinta‐Antila, S.; Rytkönen, K.; Shiba, T.; Sonnenschein, V.; Sonzogni, A. A.; Vedia, V.; Voss, A.; Wilson, J. N.; Zakari-Issoufou, A.-A.

doi:10.1103/physrevc.96.014319

Cited by 15 publications

(11 citation statements)

References 81 publications

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“…The Decay Total Absorption γ-ray Spectrometer (DTAS) [351] has been successfully commissioned at IGISOL and has already provided e.g. β-decay intensities of importance for the r-process nuclear reaction network calculations [352] and could in principle be used for the β-Oslo method. The Selective Production of Exotic Species (SPES) facility is the upgrade path envisioned for LNL [354].…”

Section: Jyväskylä Accelerator Laboratorymentioning

confidence: 99%

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Larsen

Spyrou

Liddick

et al. 2019

Progress in Particle and Nuclear Physics

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The rapid-neutron capture process (r process) is identified as the producer of about 50% of elements heavier than iron.This process requires an astrophysical environment with an extremely high neutron flux over a short amount of time (∼ seconds), creating very neutron-rich nuclei that are subsequently transformed to stable nuclei via β − decay. In 2017, one site for the r process was confirmed: the advanced LIGO and advanced Virgo detectors observed two neutron stars merging, and immediate follow-up measurements of the electromagnetic transients demonstrated an "afterglow" over a broad range of frequencies fully consistent with the expected signal of an r process taking place. Although neutronstar mergers are now known to be r-process element factories, contributions from other sites are still possible, and a comprehensive understanding and description of the r process is still lacking. One key ingredient to large-scale r-process reaction networks is radiative neutron-capture (n, γ) rates, for which there exist virtually no data for extremely neutronrich nuclei involved in the r process. Due to the current status of nuclear-reaction theory and our poor understanding of basic nuclear properties such as level densities and average γ-decay strengths, theoretically estimated (n, γ) rates may vary by orders of magnitude and represent a major source of uncertainty in any nuclear-reaction network calculation of rprocess abundances. In this review, we discuss new approaches to provide information on neutron-capture cross sections and reaction rates relevant to the r process. In particular, we focus on indirect, experimental techniques to measure radiative neutron-capture rates. While direct measurements are not available at present, but could possibly be realized in the future, the indirect approaches present a first step towards constraining neutron-capture rates of importance to the r process.

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Section: Jyväskylä Accelerator Laboratorymentioning

confidence: 99%

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Larsen

Spyrou

Liddick

et al. 2019

Progress in Particle and Nuclear Physics

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“…3. The summing-pileup distortion, present in all our measurements, was calculated as in previous works [16,18,19,47] with a Monte Carlo (MC) procedure based on the random superposition of two stored events within the ADC gate [46,48].…”

Section: Methodsmentioning

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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“…We also investigated nuclides below 68 Ni (Z = 28, N = 40), namely 69,70 Co and 67 Fe. 68 Ni has some doubly magic features, such as high excitation energy of the first 2 + state and low transition strength B(E2; 0 g.s. → 2 + 1 ) [23,24].…”

Section: Nuclei In the Vicinity Of 78 Nimentioning

confidence: 99%

“…The mass measurements of 69 Co and 67 Fe are also important for accurate neutron separation energies needed to calculate neutron-capture and their inverse photodisintegration rates in the astrophysical rapid neutron capture process (r process) [34,35]. Sensitivity studies [36] have shown that 67 Fe(n, γ ) 68 Fe and 68 Co(n, γ ) 69 Co have a strong impact on the calculated r-process abundances. With the new JYFLTRAP measurements, we could reduce the mass-related uncertainties in these impactful neutron-capture rates.…”

Section: Nuclei In the Vicinity Of 78 Nimentioning

confidence: 99%

“…The TASISpec silicon detector array together with a cluster and clover detectors were employed to study beta decay of 127 Cd [66]. Total absorption gamma-ray spectroscopy has been performed on the beta decays of 87 Br, 88 Br, and 94 Rb [67], 100 Tc [68] and 100gs,100m Nb and 102gs,102m Nb [69]. The study of the first multiple-beta-delayed neutron emitter above A = 100, 136 Sb [70], also involved JYFLTRAP to select only the 136 Sb ions for the studies.…”

Section: Other Activities At Jyfltrapmentioning

confidence: 99%

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Recent experiments at the JYFLTRAP Penning trap

et al. 2020

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The JYFLTRAP double Penning trap mass spectrometer at the Ion Guide Isotope Separator On-Line (IGISOL) facility offers excellent possibilities for high-precision mass measurements of radioactive ions. Around 400 atomic masses, including around 50 isomeric states, have been measured since JYFLTRAP became operational. JYFLTRAP has also been used as a high-resolution mass separator for decay spectroscopy experiments as well as an ion counter for fission yield studies. In this contribution, an overview of recent activities at the JYFLTRAP Penning trap is given, with a focus on nuclei discussed in the PLATAN2019 meeting.

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Experimental study of Tc100 β decay with total absorption γ -ray spectroscopy

Cited by 15 publications

References 81 publications

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Total absorption γ -ray spectroscopy of niobium isomers

Recent experiments at the JYFLTRAP Penning trap

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