Mass measurements near the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>r</mml:mi></mml:math>-process path using the Canadian Penning Trap mass spectrometer

Schelt, J. Van; Lascar, D.; Savard, G.; Clark, J. A.; Caldwell, S.; Chaudhuri, A.; Fallis, J.; Greene, J. P.; Levand, A. F.; Li, G.; Sharma, K. S.; Sternberg, M.; Sun, T.; Zabransky, B. J.

doi:10.1103/physrevc.85.045805

Cited by 60 publications

(56 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[60] for the Tellurium isotopes reaching 139 Te. Recent mass measurements for Tellurium isotopes [61,62] have ruled out this sudden drop in neutron separation energies. However, at present there is no data for lighter isotopes in the region where FRDM also predicts very low neutron separation energies [59].…”

Section: A Time Evolution and Energy Generationmentioning

confidence: 99%

Nuclear robustness of therprocess in neutron-star mergers

et al. 2015

View full text Add to dashboard Cite

We have performed r-process calculations for matter ejected dynamically in neutron star mergers based on a complete set of trajectories from a three-dimensional relativistic smoothed particle hydrodynamic simulation with a total ejected mass of ∼ 1.7 × 10 −3 M . Our calculations consider an extended nuclear network, including spontaneous, β-and neutron-induced fission and adopting fission yield distributions from the ABLA code. In particular we have studied the sensitivity of the r-process abundances to nuclear masses by using different models. Most of the trajectories, corresponding to 90% of the ejected mass, follow a relatively slow expansion allowing for all neutrons to be captured. The resulting abundances are very similar to each other and reproduce the general features of the observed r-process abundance (the second and third peaks, the rare-earth peak and the lead peak) for all mass models as they are mainly determined by the fission yields. We find distinct differences in the predictions of the mass models at and just above the third peak, which can be traced back to different predictions of neutron separation energies for r-process nuclei around neutron number N = 130. In all simulations, we find that the second peak around A ∼ 130 is produced by the fission yields of the material that piles up in nuclei with A 250 due to the substantially longer beta-decay half-lives found in this region. The third peak around A ∼ 195 is generated in a competition between neutron captures and β decays during r-process freeze-out. The remaining trajectories, which contribute 10% by mass to the total integrated abundances, follow such a fast expansion that the r process does not use all the neutrons. This also leads to a larger variation of abundances among trajectories as fission does not dominate the r-process dynamics. The resulting abundances are in between those associated to the r and s processes. The total integrated abundances are dominated by contributions from the slow abundances and hence reproduce the general features of the observed r-process abundances. We find that at timescales of weeks relevant for kilonova light curve calculations, the abundance of actinides is larger than the one of lanthanides. This means that actinides can be even more important than lanthanides to determine the photon opacities under kilonova conditions. Moreover, we confirm that the amount of unused neutrons may be large enough to give rise to another observational signature powered by their decay.

show abstract

Section: A Time Evolution and Energy Generationmentioning

confidence: 99%

Nuclear robustness of therprocess in neutron-star mergers

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Another significant advancement since the Pfeiffer work is in the knowledge of Q β and Q βn values for very neutron rich nuclei. Much more precise values are now available due to measurements using Penning traps [22,23] and storage rings [24]. Q values are taken from the 2011 update to the Atomic Mass evaluation work of Audi et al, [25].…”

mentioning

confidence: 99%

Improving systematic predictions ofβ-delayed neutron emission probabilities

et al. 2012

View full text Add to dashboard Cite

“…Using the MR-TOF to provide high-resolution isobaric separation eliminates the in-trap contaminant removal process used previously in TOF-ICR [7], decreasing the measurement cycle time dramatically. In PI-ICR the resolution is no longer limited by the spectral Fourier line width characteristic to TOF-ICR, thus also reducing the cycle time.…”

Section: Advantages Of Pi-icr Over Tof-icrmentioning

confidence: 99%

Phase-imaging Mass Measurements with the Canadian Penning Trap Mass Spectrometer

Orford¹,

Clark²,

Nystrom³

et al. 2017

Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016)

View full text Add to dashboard Cite

The Canadian Penning trap mass spectrometer (CPT) is currently dedicated to making precision mass measurements of neutron-rich nuclei approaching the astrophysical r -process path. Over the past two years, upgrades to CARIBU and to the detector system of the CPT have been made in order to probe shorter-lived nuclei further from stability. The installation of the MR-TOF and the commissioning of the modern phase-imaging mass measurement technique at the CPT are reported.

show abstract

Mass measurements near ther-process path using the Canadian Penning Trap mass spectrometer

Cited by 60 publications

References 77 publications

Nuclear robustness of therprocess in neutron-star mergers

Nuclear robustness of therprocess in neutron-star mergers

Improving systematic predictions ofβ-delayed neutron emission probabilities

Phase-imaging Mass Measurements with the Canadian Penning Trap Mass Spectrometer

Contact Info

Product

Resources

About