Neutron capture measurement at the n TOF facility of the <sup>204</sup>Tl and <sup>205</sup>Tl s-process branching points

Casanovas, A.; Tarifeño-Saldivia, A.; Domingo‐Pardo, C.; Calviño, F.; Maugeri, E.; Guerrero, C.; Lerendegui-Marco, J.; Dressler, R.; Heinitz, S.; Schumann, D.; Taín, J. L.; Quesada, J.; Aberle, O.; Alcayne, V.; Amaducci, S.; Andrzejewski, J.; Audouin, L.; Babiano-Suárez, V.; Bacak, M.; Balibrea, J.; Barbagallo, M.; Bennett, S.; Berthoumieux, E.; Bosnar, D.; Brown, A.; Busso, M.; Caamaño, M.; Caballero, L.; Calviani, M.; Cano‐Ott, D.; Cerutti, F.; Chiaveri, E.; Colonna, N.; Cortés, G.; Cortés‐Giraldo, M. A.; Cosentino, L.; Cristallo, S.; Damone, L. A.; Davies, P. J.; Diakaki, Μ.; Dietz, M.; Ducasse, Q.; Dupont, E.; Durán, I.; Eleme, Z.; Fernández-Domíngez, B.; Ferrari, A.; Ferro-Gonçalves, I.; Finocchiaro, P.; Furman, V.; Garg, R.; Gawlik, A.; Gilardoni, S.; Göbel, K.; González‐Romero, E.; Gunsing, F.; Heyse, J.; Jenkins, D. G.; Jericha, E.; Jiri, U.; Junghans, A. R.; Kadi, Y.; Käppeler, F.; Kimura, Akira; Knapová, I.; Kokkoris, M.; Kopatch, Y.; Krtička, M.; Kurtulgil, D.; Ladarescu, I.; Lederer-Woods, C.; Lonsdale, S. J.; Macina, D.; Manna, A.; Martínez, T.; Masi, A.; Massimi, C.; Mastinu, P.; Mastromarco, M.; Mazzone, A.; Mendoza, E.; Mengoni, A.; Michalopoulou, V.; Milazzo, Paolo; Millán-Callado, M. A.; Mingrone, F.; Moreno-Soto, J.; Musumarra, A.; Negret, A.; Ogállar, F.; Oprea, A.; Patronis, N.; Pavlik, A.; Perkowski, J.; Petrone, C.; Piersanti, L.; Pirovano, E.; Porras, I.; Praena, J.; Ramos, D.; Reifarth, R.; Rochman, D.; Rubbia, C.; Sabaté-Gilarte, M.; Saxena, A.; Schillebeeckx, P.; Sekhar, A.; Smith, A. G.; Sosnin, N. V.; Sprung, P.; Stamatopoulos, A.; Tagliente, G.; Tassan‐Got, L.; Thomas, B.; Torres-Sánchez, P.; Tsinganis, A.; Urlaß, S.; Valenta, S.; Vannini, G.; Variale, V.; Vaz, P.; Ventura, A.; Vescovi, D.; Vlachoudis, V.; Vlastou, R.; Wallner, A.; Woods, P. J.; Wright, T.; Žugec, P.; Köester, U.

doi:10.1088/1742-6596/1668/1/012005

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…These include, for instance, a 4π total absorption calorimeter made of 40 BaF 2 crystals [24,25] and low-neutron-sensitivity C 6 D 6 detectors [26] optimised by the n_TOF collaboration for (n,γ) reactions. As a consequence, n_TOF has allowed us, in some cases for the first time, to measure accurate neutron cross-section data on highly radioactive samples [27][28][29][30] and derive MACSs for different stellar temperatures.…”

Section: The N_tof Facility At Cernmentioning

confidence: 99%

“…However, in cases where the daughter nucleus is stable, only the time-of-flight method can be applied. Thus far, the TOF method has been utilised for the measurement of another five branching nuclei: 63 Ni [28], 99 Tc [73], 151 Sm [27], 171 Tm [29] and 204 Tl [30], and there are plans to also measure 79 Se in the near future at CERN's n_TOF [78]. At present, in several cases, such as 79 Se, 81,85 Kr, 95 Zr, 185 W and 192 Ir, only theoretical calculations become available (see references cited in [42]), with typical discrepancies of a factor of two or more in the predicted MACS values.…”

Section: Branching Points Of the S Processmentioning

confidence: 99%

“…For many relevant branching nuclei, neutron capture leads to a stable isotope, where only the TOF method becomes applicable. In many cases [28][29][30], the main contribution to the cross-section uncertainty in the stellar energy range around 30 keV arises from the increasing contribution of neutron-induced backgrounds towards higher neutron energy. Owing to the decreasing signal-to-background ratio, it becomes increasingly difficult to observe resolved resonances beyond ∼10 keV.…”

Section: Future Perspectivesmentioning

confidence: 99%

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n_TOF: Measurements of Key Reactions of Interest to AGB Stars

et al. 2022

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In the last 20 years, the neutron time-of-flight facility n_TOF at CERN has been providing relevant data for the astrophysical slow neutron capture process (s process). At n_TOF, neutron-induced radiative capture (n,γ) as well as (n,p) and (n,α) reaction cross sections are measured as a function of energy, using the time-of-flight method. Improved detection systems, innovative ideas and collaborations with other neutron facilities have lead to a considerable contribution of the n_TOF collaboration to studying the s process in asymptotic giant branch stars. Results have been reported for stable and radioactive samples, i.e., 24,25,26Mg,26Al, 33S, 54,57Fe, 58,59,62,63Ni, 70,72,73Ge, 90,91,92,93,94,96Zr, 139La, 140Ce, 147Pm, 151Sm, 154,155,157Gd, 171Tm, 186,187,188Os, 197Au, 203,204Tl, 204,206,207Pb and 209Bi isotopes, while others are being studied or planned to be studied in the near future. In this contribution, we present an overview of the most successful achievements, and an outlook of future challenging measurements, including ongoing detection system developments.

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Section: The N_tof Facility At Cernmentioning

confidence: 99%

Section: Branching Points Of the S Processmentioning

confidence: 99%

Section: Future Perspectivesmentioning

confidence: 99%

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n_TOF: Measurements of Key Reactions of Interest to AGB Stars

et al. 2022

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“…1. C 6 D 6 detectors have been used since 2006 for many capture measurements at the n TOF facility [16][17][18], including also measurements of actinides [19][20][21][22][23]. The main advantages of these detectors are the low neutron sensitivity and good time resolution, with pulses of ∼10 ns Full Width Half Maximum.…”

Section: B Detection Setupmentioning

confidence: 99%

Measurement of the $$^{244}$$ 244 Cm and $$^{246}$$ 246 Cm Neutron-Induced Cross Sections at the n_TOF Facility

Alcayne¹,

Kimura²,

Mendoza³

et al. 2019

Springer Proceedings in Physics

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The neutron capture reactions in 244 Cm and 246 Cm isotopes open the path of the formation of heavier Cm isotopes and heavier elements such as Bk and Cf. In addition, both isotopes are two of the minor actinides with a large contribution to the decay heat and to the neutron emission in irradiated fuels proposed for the transmutation of the nuclear waste and fast critical reactors. The available experimental data for both isotopes is very scarce due to the difficulties in performing the measurements: high intrinsic activity of the samples and the limited facilities capable of providing isotopically enriched samples. We propose to perform a neutron capture cross section measurement with isotopically enriched samples of 244 Cm and 246 Cm provided by JAEA. The measurement will cover the range from 1 eV to 550 eV and will be performed at the n_TOF Experimental Area 2 (EAR-2). In addition, a normalization measurement with the 244 Cm sample will be performed at Experimental Area 1 (EAR-1) with the Total Absorption Calorimeter.Requested protons: 8.5x10 18 protons on target Experimental area: EAR2 (8.0x10 18 protons) and EAR1 (0.5x10 18 protons).

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Analysis of the impact of the ²⁰⁴Tl neutron capture cross section on the s-process only isotope ²⁰⁴Pb

et al. 2022

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In the study of the slow (s) process of nucleosynthesis branching nuclei become of particular interest. These nuclei have half-lives of the order of 1-100 years, and in the stellar environment their decay rate can compete with the neutron capture rate, which effectively leads to a split of the s-process path. Due to the dependence of the decay and the neutron capture rates on the the physical conditions -temperature and neutron density-of the nucleosynthesis environment, variations in these conditions lead to a change in the abundances of the immediately following nuclei. A very interesting branching point is the s-process only 204Tl, which decays to 204Pb. In this work we show how the capture cross section of 204Tl is a key nuclear input which, in addition to being crucial in fixing the ultimate 204Pb s-process abundance, makes the latter sensible to the temperature and neutron density of the stellar environment where the s-process takes place.

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Neutron capture measurement at the n TOF facility of the ²⁰⁴Tl and ²⁰⁵Tl s-process branching points

Cited by 5 publications

References 8 publications

n_TOF: Measurements of Key Reactions of Interest to AGB Stars

n_TOF: Measurements of Key Reactions of Interest to AGB Stars

Measurement of the $$^{244}$$ 244 Cm and $$^{246}$$ 246 Cm Neutron-Induced Cross Sections at the n_TOF Facility

Analysis of the impact of the ²⁰⁴Tl neutron capture cross section on the s-process only isotope ²⁰⁴Pb

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Neutron capture measurement at the n TOF facility of the 204Tl and 205Tl s-process branching points

Cited by 5 publications

References 8 publications

n_TOF: Measurements of Key Reactions of Interest to AGB Stars

n_TOF: Measurements of Key Reactions of Interest to AGB Stars

Measurement of the $$^{244}$$ 244 Cm and $$^{246}$$ 246 Cm Neutron-Induced Cross Sections at the n_TOF Facility

Analysis of the impact of the 204Tl neutron capture cross section on the s-process only isotope 204Pb

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Neutron capture measurement at the n TOF facility of the ²⁰⁴Tl and ²⁰⁵Tl s-process branching points

Analysis of the impact of the ²⁰⁴Tl neutron capture cross section on the s-process only isotope ²⁰⁴Pb