EXILL - a high-efficiency, high-resolution setup for gamma-spectroscopy at an intense cold neutron beam facility

0482518 - ÚJF 2018 RIV GB eng J - Článek v odborném periodiku
Jentschel, M. - Blanc, A. - de France, G. - Koster, U. - Leoni, S. - Mutti, P. - Simpson, G. S. - Krtička, M. - Tomandl, Ivo - Valenta, S. … celkem 133 autorů
EXILL - a high-efficiency, high-resolution setup for gamma-spectroscopy at an intense cold neutron beam facility.
Journal of Instrumentation. Roč. 12, č. 11 (2017), č. článku P11003. ISSN 1748-0221. E-ISSN 1748-0221
Institucionální podpora: RVO:61389005
Klíčová slova: instrumentation for neutron sources * gamma detectors * spectrometers
Obor OECD: Nuclear physics
Impakt faktor: 1.258, rok: 2017

In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of gamma-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10(8) ns(-1)cm(2) at the target position and negligible neutron halo. The targetwas surrounded by an array of eight to ten anti-Compton shielded EXOGAMClover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectorswere arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 x 10(5) Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of Ba-133, Co-60 and Eu-152 as well as data from the reactions Al-27(n, gamma)Al-28 and Cl-35(n,gamma)Cl-36 in the energy range from 30 keV up to 10MeV.
Trvalý link: http://hdl.handle.net/11104/0277944