在欧洲核子研究中心中子飞行时间装置（n_TOF）上对151Sm的中子俘获截面进行测量。

Neutron capture cross section measurement of 151Sm at the CERN neutron time of flight facility (n_TOF).

作者信息

Abbondanno U, Aerts G, Alvarez-Velarde F, Alvarez-Pol H, Andriamonje S, Andrzejewski J, Badurek G, Baumann P, Becvár F, Benlliure J, Berthoumieux E, Calviño F, Cano-Ott D, Capote R, Cennini P, Chepel V, Chiaveri E, Colonna N, Cortes G, Cortina D, Couture A, Cox J, Dababneh S, Dahlfors M, David S, Dolfini R, Domingo-Pardo C, Duran I, Embid-Segura M, Ferrant L, Ferrari A, Ferreira-Marques R, Frais-Koelbl H, Furman W, Goncalves I, Gallino R, Gonzalez-Romero E, Goverdovski A, Gramegna F, Griesmayer E, Gunsing F, Haas B, Haight R, Heil M, Herrera-Martinez A, Isaev S, Jericha E, Käppeler F, Kadi Y, Karadimos D, Kerveno M, Ketlerov V, Koehler P, Konovalov V, Krticka M, Lamboudis C, Leeb H, Lindote A, Lopes I, Lozano M, Lukic S, Marganiec J, Marrone S, Martinez-Val J, Mastinu P, Mengoni A, Milazzo P M, Molina-Coballes A, Moreau C, Mosconi M, Neves F, Oberhummer H, O'Brien S, Pancin J, Papaevangelou T, Paradela C, Pavlik A, Pavlopoulos P, Perlado J M, Perrot L, Pignatari M, Plag R, Plompen A, Plukis A, Poch A, Policarpo A, Pretel C, Quesada J, Raman S, Rapp W, Rauscher T, Reifarth R, Rosetti M, Rubbia C, Rudolf G, Rullhusen P, Salgado J, Soares J C, Stephan C, Tagliente G, Tain J, Tassan-Got L, Tavora L, Terlizzi R, Vannini G, Vaz P, Ventura A, Villamarin D, Vincente M C, Vlachoudis V, Voss F, Wendler H, Wiescher M, Wisshak K

机构信息

Istituto Nazionale di Fisica Nucleare, Trieste, Italy.

出版信息

Phys Rev Lett. 2004 Oct 15;93(16):161103. doi: 10.1103/PhysRevLett.93.161103. Epub 2004 Oct 14.

DOI:10.1103/PhysRevLett.93.161103

PMID:15524972

Abstract

The151Sm(n,gamma)152Sm cross section has been measured at the spallation neutron facility n_TOF at CERN in the energy range from 1 eV to 1 MeV. The new facility combines excellent resolution in neutron time-of-flight, low repetition rates, and an unsurpassed instantaneous luminosity, resulting in rather favorable signal/background ratios. The 151Sm cross section is of importance for characterizing neutron capture nucleosynthesis in asymptotic giant branch stars. At a thermal energy of kT=30 keV the Maxwellian averaged cross section of this unstable isotope (t(1/2)=93 yr) was determined to be 3100+/-160 mb, significantly larger than theoretical predictions.

摘要

在欧洲核子研究中心（CERN）的散裂中子源n_TOF上，测量了能量范围从1电子伏特到1兆电子伏特的151Sm(n,γ)152Sm截面。这个新设施在中子飞行时间方面具有出色的分辨率、低重复率以及无与伦比的瞬时亮度，从而产生了相当有利的信号/本底比。151Sm截面对于表征渐近巨星分支恒星中的中子俘获核合成至关重要。在热能kT = 30千电子伏特时，这种不稳定同位素（半衰期t(1/2)=93年）的麦克斯韦平均截面被确定为3100±160毫靶，显著大于理论预测值。