Neutron Capture on the 
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-Process Branching Point 
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 via Time-of-Flight and Activation

Guerrero, C.; Lerendegui-Marco, J.; Paul, M.; Tessler, M.; Heinitz, S.; Domingo‐Pardo, C.; Cristallo, S.; Dressler, R.; Halfon, S.; Kivel, N.; Köster, U.; Maugeri, E. A.; Palchan-Hazan, T.; Quesada, J. M.; Rochman, D.; Schumann, D.; Weissman, L.; Aberle, O.; Amaducci, S.; Andrzejewski, J.; Audouin, L.; Bécares, V.; Bacak, M.; Balibrea, J.; Barak, Amitzur Z.; Barbagallo, M.; Barros, S.; Bečvář, F.; Beinrucker, C.; Berkovits, D.; Berthoumieux, E.; Billowes, J.; Bosnar, D.; Brügger, M.; Buzaglo, Y.; Caamaño, M.; Calviño, F.; Calviani, M.; Cano‐Ott, D.; Cardella, R.; Casanovas, A.; Castelluccio, Donato Maurizio; Cerutti, F.; Chen, Y H; Chiaveri, E.; Colonna, N.; Cortés, G.; Cortés-Giraldo, M.A.; Cosentino, L.; Dafna, H.; D’Amone, A.; Diakaki, Μ.; Dietz, M.; Dupont, E.; Durán, I.; Eisen, Y.; Fernández–Domínguez, B.; Ferrari, A.; Ferreira, Paulo Ricardo Araújo; Finocchiaro, P.; Furman, V.; Göbel, K.; García, A. R.; Gawlik, A.; Glodariu, T.; Gonçalves, I. F.; González‐Romero, E.; Goverdovski, A.; Griesmayer, E.; Gunsing, F.; Harada, Hideo; Heftrich, T.; Heyse, J.; Hirsh, T.; Jenkins, D. G.; Jericha, E.; Käppeler, F.; Kadi, Y.; Kaizer, B.; Katabuchi, Tatsuya; Kavrigin, P.; Ketlerov, V.; Khryachkov, V.; Kijel, D.; Kimura, A.; Kokkoris, M.; Kriesel, A; Krtička, M.; Leal-Cidoncha, E.; Lederer-Woods, C.; Leeb, H.; Meo, S. Lo; Lonsdale, S. J.; Losito, R.; Macina, D.; Manna, A.; Marganiec, J.; Martínez, T.; Massimi, C.; Mastinu, P.; Mastromarco, M.; Matteuccí, F.; Mendoza, E.; Mengoni, A.; Milazzo, Paolo; Millán-Callado, M. A.; Mingrone, F.; Mirea, M.; Montesano, S.; Musumarra, A.; Nolte, Roeland J. M.; Oprea, A.; Patronis, N.; Pavlik, A.; Perkowski, J.; Piersanti, L.; Porras, I.; Praena, J.; Rajeev, K. P.; Rauscher, T.; Reifarth, R.; Rodríguez-González, T.; Rout, P. C.; Rubbia, C.; Ryan, J. A.; Sabaté-Gilarte, M.; Saxena, A.; Schillebeeckx, P.; Schmidt, S.; Shor, A.; Sedyshev, P.; Smith, A. G.; Stamatopoulos, A.; Tagliente, G.; Taín, J. L.; Tarifeño-Saldivia, A.; Tassan‐Got, L.; Tsinganis, A.; Valenta, S.; Vannini, G.; Variale, V.; Vaz, P.; Ventura, A.; Vlachoudis, V.; Vlastou, R.; Wallner, A.; Warren, S.; Weigand, M.; Weiß, C.; Wolf, C.; Woods, P. J.; Wright, T.; Žugec, P.; Tof<, mtext>; mtext,; mrow,

doi:10.1103/physrevlett.125.142701

Cited by 23 publications

(19 citation statements)

References 40 publications

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“…We provide the material for interesting, challenging and exiting scientific experiments all over the world, in a broad field of research and applications. A remarkable number of well-recognized results has been published in high-ranking scientific journals, for instance in Physical Review Letters: six have already appeared, [19a,b,20a,28,30,44] one is accepted [48] and one is currently under revision. [43] As a special highlight, it has to be emphasized, that, so far, all experiments on nuclear properties of 60 Fe using macro amounts, such as half-life and neutron capture cross sections within the last 20 years, were conducted with samples in which the material was produced and the samples were tailor-made at PSI.…”

Section: Discussionmentioning

confidence: 99%

“…Examples for such successful sample preparation and target manufacturing from 'outside samples', used in dedicated scientific experiments, are e.g. the neutron capture cross section measurements of 63 Ni, [44] 171 Tm and 147 Pm at n_TOF (CERN, Switzerland) and SARAF (SOREQ, Israel), respectively, [45,48] as well as the determination of the atomic transitions and the first ionization potential of promethium at University Mainz (Germany). [46]…”

Section: Samples From Isotopes Not Produced At Psimentioning

confidence: 99%

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Exotic Radionuclides – What are they good for?

Schumann

Maugeri

Dressler

2020

Chimia

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Accelerator waste contains a number of rare isotopes that are urgently needed in various fields of scientific research. Activated components from the surroundings of high-power accelerators like the HIPA cyclotron at PSI are valuable sources for such 'isotope mining' . While the isotope production itself is practically 'for free' , because the irradiation takes place anyway, the challenge is the chemical extraction of the required isotopes from the activated matrix material. The article presents an overview on the attempts and achievements of more than 15 years research and development in the research group 'Isotope and Target Chemistry' at PSI and presents some of the highlights in scientific applications.

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Section: Discussionmentioning

confidence: 99%

Section: Samples From Isotopes Not Produced At Psimentioning

confidence: 99%

Exotic Radionuclides – What are they good for?

Schumann

Maugeri

Dressler

2020

Chimia

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“…Radioisotopically pure 171 Tm was taken from leftovers of an earlier experiment performed in 2014 [4], where 140 GBq of 171 Tm were produced and separated from 250 mg of 98.1 % enriched 170 Er [5]. The last separation date of Tm from Yb was the 01.11.2014 with a total content of 171 Yb of only 0.017 % [5].…”

Section: Methodsmentioning

confidence: 99%

“…This discrepancy might be caused by insufficient knowledge of the nuclear properties of 171 Tm. Very recently experiments were performed to investigate the neutron capture cross-section of 171 Tm [4] but precise γ-spectroscopic characterization [5] of the amount of 171 Tm target material used in these experiments strongly depends on the γ-emission probability of this isotope. 171 Tm can be produced by neutron activation of 170 Er and is primarily measured by liquid scintillation counting.…”

Section: Introductionmentioning

confidence: 99%

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Emission probability of the 66.7 keV γ transition in the decay of Tm171

et al. 2018

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The γ-emission probability of the 66.73 keV line in the decay of 171 Tm has been experimentally determined using γ-spectrometry and inductively coupled mass spectrometry. Using a set of two reference sources, namely 60 Co as primary standard and 44 Ti/ 44 Sc in secular equilibrium as secondary standards, we were able to deduce the detection efficiency at 67.87 keV of the used γspectrometry setup with high precision. The emission probability of the 66.73 keV γ-transition in the decay of 171 Tm has been determined with a set of three radioisotopically pure 171 Tm samples to be 0.159(6) %.

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Compton Imaging and Machine-Learning techniques for an enhanced sensitivity in key stellar (n,γ) measurements

et al. 2022

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Neutron capture cross-section measurements are fundamental in the study of astrophysical phenomena, such as the slow neutron capture (s-) process of nucleosynthesis operating in red-giant stars. To enhance the sensitivity of such measurements we have developed the i-TED detector. i-TED is an innovative detection system which exploits the Compton imaging technique with the aim of obtaining information about the incoming direction of the detected γ-rays. The imaging capability allows one to reject a large fraction of the dominant γ-ray background, hence enhancing the (n,γ) detection sensitivity. This work summarizes the main results of the first experimental proof-of-concept of the background rejection with i-TED carried out at CERN n_TOF using an early i-TED demonstrator. Two state-of-the-art C6D6 detectors were also used to benchmark the performance of i-TED. The i-TED prototype built for this study shows a factor of ~3 higher detection sensitivity than C6D6 detectors in the ~10 keV neutron-energy range of astrophysical interest. This works also introduces the perspectives of further enhancement in performance attainable with the final i-TED array and new analysis methodologies based on Machine-Learning techniques. The latter provide higher (n,γ) detection efficiency and similar enhancement in the sensitivity than the analytical method based on the Compton scattering law. Finally, we present our proposal to use this detection system for the first time on key astrophysical (n,γ) measurements, in particular on the s-process branching-point 79Se, which is especially well suited to constrain the thermal conditions of Red Giant and Massive Stars.

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Neutron Capture on the s -Process Branching Point Tm171 via Time-of-Flight and Activation

Cited by 23 publications

References 40 publications

Exotic Radionuclides – What are they good for?

Exotic Radionuclides – What are they good for?

Emission probability of the 66.7 keV γ transition in the decay of Tm171

Compton Imaging and Machine-Learning techniques for an enhanced sensitivity in key stellar (n,γ) measurements

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