Measurement of $^{139}$La(n,$\gamma$) Cross Section at n_TOF

R. Terlizzi , U. Abbondanno , G. Aerts , H. Álvarez , F. Alvarez-Velarde , S. Andriamonje , J. Andrzejewski , P. Assimakopoulos , L. Audouin (1) , G. Badurek , P. Baumann (2) , F. Bevá , E. Berthoumieux , F. Calviño , D. Cano-Ott , R. Capote , A. Carrillo de Albornoz , P. Cennini , V. Chepel , E. Chiaveri , N. Colonna , G. Cortes , A. Couture , J. Cox , S. David (1) , R. Dolfini , C. Domingo-Pardo , M. Dalhfors , W. Dridi , I. Duran , C. Eleftheriadis , M. Embid-Segura , L. Ferrant (1) , Anthony Ferrari , R. Ferreira-Marques , L. Fitzpatrick , H. Frais-Koelbl , K. Fujii , W. Furman , C. Guerrero , I. Goncalves , R. Gallino , E. Gonzalez-Romero , A. Goverdovski , F. Gramegna , E. Griesmayer , F. Gunsing , B. Haas (3) , R. Haight , M. Heil , A. Herrera-Martinez , M. Igashira , S. Isaev (1) , E. Jericha , Y. Kadi , F. Käppeler , D. Karamanis , D. Karadimos , M. Kerveno (2) , V. Ketlerov , P. Koehler , V. Konovalov , E. Kossionides , M. Krtika , C. Lamboudis , H. Leeb , A. Lindote , I. Lopes , M. Lozano , S. Lukic (2) , J. Marganiec , L. Marques , S. Marrone , P. Mastinu , A. Mengoni , P.M. Milazzo , C. Moreau , M. Mosconi , F. Neves , H. Oberhummer , S. O'Brien , M. Oshima , J. Pancin , C. Papachristodoulou , C.T. Papadopoulos , C. Paradela , N. Patronis , A. Pavlik , P. Pavlopoulos , L. Perrot , R. Plag , A. Plompen , A. Plukis , A. Poch , C. Pretel , J. Quesada , T. Rauscher , R. Reifarth , M. Rosetti , C. Rubbia , G. Rudolf (2) , P. Rullhusen , J. Salgado , L. Sarchiapone , I. Savvidis , C. Stephan (1) , G. Tagliente , J. L. Tain , L. Tassan-Got (1) , L. Tavora , I. Dillmann , G. Vannini , P. Vaz , A. Ventura , D. Villamarin , M.C. Vincente , V. Vlachoudis , R. Vlastou , F. Voss , S. Walter , H. Wendler , M. Wiescher , K. Wisshak

1 IPNO - Institut de Physique Nucléaire d'Orsay
2 DRS-IPHC - Département Recherches Subatomiques
3 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

The capture cross section of the 139La has been measured relative to 197Au standard at n_TOF. We provide here a short description of the experimental apparatus and of the data analysis procedures. The extracted resonance parameters allow to calculate the fundamental nuclear quantities such as average spacing $\langleD\rangle$ 1=0 = 268 ± 22 eV, $\langleD\rangle$ 1=1 < 250 eV neutron strength functions S0 = (0.79 ± 0.03)×10-4, and S1 = (0.73 ± 0.05)×10-4 and the Maxwellian-averaged capture cross section (MACS). The MACS is particularly useful for the determination of the abundance synthesized by the main component of the s process

Mots clés: neutron radiative capture; lanthanum; nuclei with mass number 90 to 149; time of flight spectroscopy

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

R. Terlizzi, U. Abbondanno, G. Aerts, H. Álvarez, F. Alvarez-Velarde, et al.. Measurement of $^{139}$La(n,$\gamma$) Cross Section at n_TOF. Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR, Sep 2005, Isle of Kos, Greece. pp.551-553, ⟨10.1063/1.2201012⟩. ⟨in2p3-00123071⟩