First Results of the 140Ce(n,γ)141Ce Cross-Section Measurement at n_TOF

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

doi:10.3390/universe7060200

Cited by 5 publications

(3 citation statements)

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“…A further recent example is the measurement of the 140 Ce(n,γ) cross section, which is one of the lowest along the s-process path. Preliminary results show sizeable differences with respect to the data in the literature [63]. Additional technical developments in instrumentation for neutron capture measurements of very low radiative neutron capture cross sections are discussed in Section 9.…”

Section: Magic Nuclei and End-pointmentioning

confidence: 93%

“…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%

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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: Magic Nuclei and End-pointmentioning

confidence: 93%

Section: Branching Points Of the S Processmentioning

confidence: 99%

n_TOF: Measurements of Key Reactions of Interest to AGB Stars

et al. 2022

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“…In more detail, we proposed to verify the MC calculations by measuring the spectrum-averaged cross section at three different temperatures (ranging form a feV keV up to 100 keV), for isotopes whose energy-dependent cross sections have recently been measured or are planned to be measured in near future at the two time-offligh measurement stations EAR1 and EAR2. Beside 197 Au [22][23][24], that will be used both as a benchmark and reference for the other isotopes, possible candidates are 64 Ni, 76 Ge [25], 88 Sr, 89 Y, 94 Zr and 140 Ce [26]. Hereafter, examples of physics cases are discussed.…”

Section: First Activation Measurement Campaign At Near and Their Phys...mentioning

confidence: 99%

NEAR: A New Station to Study Neutron-Induced Reactions of Astrophysical Interest at CERN-n_TOF

et al. 2022

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We present NEAR, a new experimental area at the CERN-n_TOF facility and a possible setup for cross section measurements of interest to nuclear astrophysics. This was recently realized with the aim of performing spectral-averaged neutron-capture cross section measurements by means of the activation technique. The recently commissioned NEAR station at n_TOF is now ready for the physics program, which includes a preliminary benchmark of the proposed idea. Based on the results obtained by dedicated Monte Carlo simulations and calculation, a suitable filtering of the neutron beam is expected to enable measurements of Maxwellian Averaged Cross Section (MACS) at different temperatures. To validate the feasibility of these studies we plan to start the measurement campaign by irradiating several isotopes whose MACS at different temperatures have recently been or are planned to be determined with high accuracy at n_TOF, as a function of energy in the two time-of-flight measurement stations. For instance, the physical cases of 88Sr(n,γ), 89Y(n,γ), 94Zr(n,γ) and 64Ni(n,γ) are discussed. As the neutron capture on 89Y produces a pure β-decay emitter, we plan to test the possibility to perform activation measurements on such class of isotopes as well. The expected results of these measurements would open the way to challenging measurements of MACS by the activation technique at n_TOF, for rare and/or exotic isotopes of interest for nuclear astrophysics.

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