Neutron Capture on the s-Process Branching Point Tm-171 via Time-of-Flight and Activation

Guerrero, C. and Lerendegui-Marco, J. and Paul, M. and Tessler, M. and Heinitz, S. and Domingo-Pardo, C. and Cristallo, S. and Dressler, R. and Halfon, S. and Kivel, N. and Koster, U. and Maugeri, E. A. and Palchan-Hazan, T. and Quesada, J. M. and Rochman, D. and Schumann, D. and Weissman, L. and Aberle, O. and Amaducci, S. and Andrzejewski, J. and Audouin, L. and Becares, V. and Bacak, M. and Balibrea, J. and Barak, A. and Barbagallo, M. and Barros, S. and Becvar, F. and Beinrucker, C. and Berkovits, D. and Berthoumieux, E. and Billowes, J. and Bosnar, D. and Brugger, M. and Buzaglo, Y. and Caamano, M. and Calvino, F. and Calviani, M. and Cano-Ott, D. and Cardella, R. and Casanovas, A. and Castelluccio, D. M. and Cerutti, F. and Chen, Y. H. and Chiaveri, E. and Colonna, N. and Cortes, G. and Cortes-Giraldo, M. A. and Cosentino, L. and Dafna, H. and Damone, A. and Diakaki, M. and Dietz, M. and Dupont, E. and Duran, I. and Eisen, Y. and Fernandez-Dominguez, B. and Ferrari, A. and Ferreira, P. and Finocchiaro, P. and Furman, V. and Goebel, K. and Garcia, A. R. and Gawlik, A. and Glodariu, T. and Goncalves, I. F. and Gonzalez-Romero, E. and Goverdovski, A. and Griesmayer, E. and Gunsing, F. and Harada, H. and Heftrich, T. and Heyse, J. and Hirsh, T. and Jenkins, D. G. and Jericha, E. and Kaeppeler, F. and Kadi, Y. and Kaizer, B. and Katabuchi, T. and Kavrigin, P. and Ketlerov, V. and Khryachkov, V. and Kijel, D. and Kimura, A. and Kokkoris, M. and Kriesel, A. and Leal-Cidoncha, E. and Lederer-Woods, C. and Leeb, H. and Lo Meo, S. and Lonsdale, S. J. and Losito, R. and Macina, D. and Manna, A. and Marganiec, J. and Martinez, T. and Massimi, C. and Mastinu, P. and Mastromarco, M. and Matteucci, F. and Mendoza, E. and Mengoni, A. and Milazzo, P. M. and Millan-Callado, M. A. and Mingrone, F. and Mirea, M. and Montesano, S. and Musumarra, A. and Nolte, R. and Oprea, A. and Patronis, N. and Pavlik, A. and Perkowski, J. and Piersanti, L. and Porras, I. and Praena, J. and Rajeev, K. and Rauscher, T. and Reifarth, R. and Rodriguez-Gonzalez, T. and Rout, P. C. and Rubbia, C. and Ryan, J. A. and Sabate-Gilarte, M. and Saxena, A. and Schillebeeckx, P. and Schmidt, S. and Shor, A. and Sedyshev, P. and Smith, A. G. and Stamatopoulos, A. and Tagliente, G. and Tain, J. L. and Tarifeno-Saldivia, A. and Tassan-Got, L. and Tsinganis, A. and Valenta, S. and Vannini, G. and Variale, V. and Vaz, P. and Ventura, A. and Vlachoudis, V. and Vlastou, R. and Wallner, A. and Warren, S. and Weigand, M. and Weiss, C. and Wolf, C. and Woods, P. J. and Wright, T. and Zugec, P.. (2020) Neutron Capture on the s-Process Branching Point Tm-171 via Time-of-Flight and Activation. Physical Review Letters, 125 (14). p. 142701.

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The neutron capture cross sections of several unstable nuclides acting as branching points in the s process are crucial for stellar nucleosynthesis studies. The unstable Tm-171 (t(1/2) = 1.92 yr) is part of the branching around mass A similar to 170 but its neutron capture cross section as a function of the neutron energy is not known to date. In this work, following the production for the first time of more than 5 mg of Tm-171 at the high-flux reactor Institut Laue-Langevin in France, a sample was produced at the Paul Scherrer Institute in Switzerland. Two complementary experiments were carried out at the neutron time-of-flight facility (n_TOF) at CERN in Switzerland and at the SARAF liquid lithium target facility at Soreq Nuclear Research Center in Israel by time of flight and activation, respectively. The result of the time -of-flight experiment consists of the first ever set of resonance parameters and the corresponding average resonance parameters, allowing us to make an estimation of the Maxwellian-averaged cross sections (MACS) by extrapolation. The activation measurement provides a direct and more precise measurement of the MACS at 30 keV: 384 (40) mb, with which the estimation from the n_TOF data agree at the limit of 1 standard deviation. This value is 2.6 times lower than the JEFF-3.3 and ENDF/B-VIII evaluations, 25% lower than that of the Bao et al. compilation, and 1.6 times larger than the value recommended in the KAlloNiS (v1) database, based on the only previous experiment. Our result affects the nucleosynthesis at the A similar to 170 branching, namely, the Yb-171 abundance increases in the material lost by asymptotic giant branch stars, providing a better match to the available pre-solar SiC grain measurements compared to the calculations based on the current JEFF-3.3 model-based evaluation.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:29 Apr 2021 12:46
Deposited On:29 Apr 2021 12:46

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