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Title: EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Journal Article · · Journal of Instrumentation
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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 γ-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 108 n s-1cm-2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover 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 detectors were 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 × 105 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 133Ba, 60Co and 152Eu as well as data from the reactions 27Al(n,γ)28Al and 35Cl(n,γ)36Cl in the energy range from 30 keV up to 10 MeV.

Research Organization:
Yale Univ., New Haven, CT (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
EXILL-Core collaboration
Grant/Contract Number:
FG02-91ER40609
OSTI ID:
1507786
Journal Information:
Journal of Instrumentation, Vol. 12, Issue 11; ISSN 1748-0221
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

Cited By (4)

FIPPS (FIssion Product Prompt γ-ray Spectrometer) and its first experimental campaign journal January 2018
Decay properties of the ${3}_{1}^{-}$ level in 96 Mo journal May 2019
New yrast and non-yrast states in I 136 and medium-spin structure of I 136 and Xe 136 : Roles of the proton d 5 / 2 and the neutron h 9 / 2 orbitals beyond Sn 132 journal August 2018
Particle-phonon coupling: Understanding the variety of excitations in the low-lying spectra of odd nuclei journal December 2019

Figures / Tables (24)

Table 1(p. 6)table Table 1
Figure 1(p. 7)figure Figure 1
Figure 2(p. 9)figure Figure 2
Figure 3(p. 10)figure Figure 3
Figure 4(p. 11)figure Figure 4
Figure 5(p. 12)figure Figure 5
Table 2(p. 13)table Table 2
Figure 6(p. 16)figure Figure 6
Figure 7(p. 18)figure Figure 7
Figure 8(p. 20)figure Figure 8
Figure 9(p. 20)figure Figure 9
Table 3(p. 21)table Table 3
Figure 10(p. 22)figure Figure 10
Table 4(p. 22)table Table 4
Figure 11(p. 23)figure Figure 11
Figure 12(p. 24)figure Figure 12
Figure 13(p. 24)figure Figure 13
Figure 14(p. 25)figure Figure 14
Figure 15(p. 26)figure Figure 15
Figure 16(p. 27)figure Figure 16
Figure 17(p. 28)figure Figure 17
Figure 18(p. 29)figure Figure 18
Figure 19(p. 29)figure Figure 19
Table 5(p. 29)table Table 5

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