Bart Bruyneel
University of Cologne, Ikp, Alumnus
The 50 � N,Z � 82 region of the Segre chart, spanning the nuclei “northwest” of doubly-magic 132Sn, is an intriguing study ground to test the suitability and predictive power of nuclear models at both low and high spins. Low-spin excited... more
The 50 � N,Z � 82 region of the Segre chart, spanning the nuclei “northwest” of doubly-magic 132Sn, is an intriguing study ground to test the suitability and predictive power of nuclear models at both low and high spins. Low-spin excited states in the nearly spherical nuclei near proton- and neutronshell closures are well described as anharmonic vibrations [1] with a gradual change to rotational structures further away from the closed shells. Further on, quasiparticle excitations play a key role and are responsible for the presence of yrast-trap isomers. These long-lived states interrupt and fragment the decay flux in spectroscopic investigations. High-j couplings involving the unique-parity h11/2 neutron-hole orbital give rise to a wealth of high-spin states with multi-quasiparticle character. In particular, detailed knowledge of isomers is crucial to ascertain the active quasiparticle configurations in the specific nucleus.
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The response of AGATA segmented HPGe detectors to gamma rays in the energy range 2–15 MeV was measured. The 15.1 MeV gamma rays were produced using the reaction d( 11 B,ng) 12 Ca t Ebeam¼ 19.1 MeV, while gamma rays between 2 and 9 MeV... more
The response of AGATA segmented HPGe detectors to gamma rays in the energy range 2–15 MeV was measured. The 15.1 MeV gamma rays were produced using the reaction d( 11 B,ng) 12 Ca t Ebeam¼ 19.1 MeV, while gamma rays between 2 and 9 MeV were produced using an Am–Be–Fe radioactive source. The energy resolution and linearity were studied and the energy-to-pulse-height conversion resulted to be linear within 0.05%.Experimental interaction multiplicity distributions are discussed and compared with the results of Geant4 simulations. It is shown that the application of gamma-ray tracking allows a suppression of background radiation caused by n-capture in Ge nuclei. Finally the Doppler correction for the 15.1 MeV gamma line, performed using the position information extracted with Pulse-shape analysis is discussed.
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... nickel isotopes S. Franchoo*, B. Bruyneel*, M. Huyse*, U. KSster t, K.-L. Kratz ++, K. Kruglov*, Y. Kudryavtsev*, WF Mueller*, B. Pfeiffer $, R. Raabe*, I. Reusen*. P. Thirolfll, P. Van Duppen*, J. \.;an Roosbroeck*, L. Vermeeren*, WB... more
... nickel isotopes S. Franchoo*, B. Bruyneel*, M. Huyse*, U. KSster t, K.-L. Kratz ++, K. Kruglov*, Y. Kudryavtsev*, WF Mueller*, B. Pfeiffer $, R. Raabe*, I. Reusen*. P. Thirolfll, P. Van Duppen*, J. \.;an Roosbroeck*, L. Vermeeren*, WB Waiters¶, L. V~issman*, and A. W5hr .t ...
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A striking difference between gamma spectra of neutron-rich Rh isotopes obtained with the laser ion source at the Leuven Isotope Separator On-Line facility has been observed depending on the mode of operation. Although the global... more
A striking difference between gamma spectra of neutron-rich Rh isotopes obtained with the laser ion source at the Leuven Isotope Separator On-Line facility has been observed depending on the mode of operation. Although the global production rate of 112Rhg,m nuclei decreases considerably, the ratio between the productions of 112Rhg and 112Rhm increases strongly when no laser ionisation is used. This
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Characterization of Segmented Large Volume, High Purity Germanium Detectors. Bruyneel, Bart (2006) Characterization of Segmented Large Volume, High Purity Germanium Detectors. ... Eine präzise Messung der Löcherdriftanisotropie wurde mit... more
Characterization of Segmented Large Volume, High Purity Germanium Detectors. Bruyneel, Bart (2006) Characterization of Segmented Large Volume, High Purity Germanium Detectors. ... Eine präzise Messung der Löcherdriftanisotropie wurde mit 356keV-Quanten durchgeführt. ...
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... Authors: Neyens, Gerda Coussement, Romain Georgiev, Georgi Bruyneel, Bart Huyse, Marc Kruglov, K Kudryavtsev, Y Severijns, Natalis Van Duppen, Pieter Van Roosbroeck, Jan Vermeeren, L Weissman, L. Issue Date: 2000. Publisher: Joint... more
... Authors: Neyens, Gerda Coussement, Romain Georgiev, Georgi Bruyneel, Bart Huyse, Marc Kruglov, K Kudryavtsev, Y Severijns, Natalis Van Duppen, Pieter Van Roosbroeck, Jan Vermeeren, L Weissman, L. Issue Date: 2000. Publisher: Joint institute for nuclear research. ...
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... Available online 6 January 2002. Abstract. An element-selective laser ion source has been used to produce beams of exotic radioactive nuclei and to study their decay properties. ... [7]I. Reusen et al., Phys. Rev. C 59 (1999), pp.... more
... Available online 6 January 2002. Abstract. An element-selective laser ion source has been used to produce beams of exotic radioactive nuclei and to study their decay properties. ... [7]I. Reusen et al., Phys. Rev. C 59 (1999), pp. 24162421. ...
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An on-line laser ion source is used at the Leuven Isotope Separator On-Line (LISOL) for the production of pure beams of exotic nuclei. The operational principal of the ion source is based on the element-selective multistep laser resonance... more
An on-line laser ion source is used at the Leuven Isotope Separator On-Line (LISOL) for the production of pure beams of exotic nuclei. The operational principal of the ion source is based on the element-selective multistep laser resonance ionization of nuclear reaction products thermalized and neutralized in a high-pressure noble gas. A number of improvements have been carried out to improve the ion source parameters.
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An element selective laser ion source has been used to produce beams of exotic radioactive nuclei and to study their decay properties. The operational principle of the ion source is based on selective resonant laser ionization of nuclear... more
An element selective laser ion source has been used to produce beams of exotic radioactive nuclei and to study their decay properties. The operational principle of the ion source is based on selective resonant laser ionization of nuclear reaction products thermalized and ...
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ABSTRACT MINOS is a new apparatus dedicated to in-beam nuclear structure experiments with low-intensity exotic beams in inverse kinematics at intermediate energies above 150MeV/nucleon. The device is composed of a thick liquid-hydrogen... more
ABSTRACT MINOS is a new apparatus dedicated to in-beam nuclear structure experiments with low-intensity exotic beams in inverse kinematics at intermediate energies above 150MeV/nucleon. The device is composed of a thick liquid-hydrogen target coupled to a compact time projection chamber (TPC) serving as a vertex tracker. Either used for in-beam gamma spectroscopy of bound excited states or invariant-mass spectroscopy of unbound states, MINOS aims at improving the luminosity by a very significant factor compared to standard solid-target material experiments while improving experimental resolutions.
... The production rates of the copper isotopes, and of the nickel and cobalt isotopes that were measured earlier, are compared to cross section calculations. Based on these new results an estimate for the cross section of 78 Ni is given.... more
... The production rates of the copper isotopes, and of the nickel and cobalt isotopes that were measured earlier, are compared to cross section calculations. Based on these new results an estimate for the cross section of 78 Ni is given. ...
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At the LISOL facility the neutron-deficient Ni isotope was produced via a ³He fusion-evaporation reaction on a Fe target positioned in the element-selective Ion-Guide Laser Ion Source (IGLIS). The decay of Ni was observed for the first... more
At the LISOL facility the neutron-deficient Ni isotope was produced via a ³He fusion-evaporation reaction on a Fe target positioned in the element-selective Ion-Guide Laser Ion Source (IGLIS). The decay of Ni was observed for the first time. The Gamow-Teller -decay strength associated with the (J{sup }=1{sup +}) level at 937.2 keV in the daughter nucleus Co was deduced. The
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The first triple cluster detector was successfully assembled for the next generation high-resolution gamma-ray spectrometer: the Advanced Gamma Tracking Array AGATA. The core part of the detector consists of three encapsulated, 36-fold... more
The first triple cluster detector was successfully assembled for the next generation high-resolution gamma-ray spectrometer: the Advanced Gamma Tracking Array AGATA. The core part of the detector consists of three encapsulated, 36-fold segmented, high-purity germanium detectors (HPGe) which are operated in a common cryostat. All 111 energy channels are equipped with cold FETs. They provide best energy resolution of core
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The interaction position resolution of the segmented HPGe detectors of an AGATA triple cluster detector has been studied through Monte Carlo simulations and in an in-beam experiment. A new method based on measuring the energy resolution... more
The interaction position resolution of the segmented HPGe detectors of an AGATA triple cluster detector has been studied through Monte Carlo simulations and in an in-beam experiment. A new method based on measuring the energy resolution of Doppler-corrected γ‐ray spectra at two different target to detector distances is described. This gives the two-dimensional position resolution in the plane perpendicular to
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An ion source for producing short-lived neutron-rich nuclei has been developed and connected to the LISOL mass separator. This source consists of a gas cell for capturing recoiling fission products which become neutralized in and... more
An ion source for producing short-lived neutron-rich nuclei has been developed and connected to the LISOL mass separator. This source consists of a gas cell for capturing recoiling fission products which become neutralized in and transported by the gas flow to the exit hole. Specific elements are selectively ionized and subsequently guided via an RF ion guide to the mass
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... 67 Co L. Weissman,* A. Andreyev, B. Bruyneel, S. Franchoo, M. Huyse, K. Kruglov, Y. Kudryavtsev, WF Mueller, R. Raabe, I. Reusen, P. Van ... of 67Co produced in proton-induced fission of 238U were measured by the detection of -delayed... more
... 67 Co L. Weissman,* A. Andreyev, B. Bruyneel, S. Franchoo, M. Huyse, K. Kruglov, Y. Kudryavtsev, WF Mueller, R. Raabe, I. Reusen, P. Van ... of 67Co produced in proton-induced fission of 238U were measured by the detection of -delayed rays emitted from an isotopically pure ...
ABSTRACT Excited states in 56Cr have been populated after 48Ca(11B,p2n) reactions at a beam energy of 32 MeV. The Cologne plunger device surrounded by a γ-detector array of one EUROBALL cluster detector and five Ge detectors was employed... more
ABSTRACT Excited states in 56Cr have been populated after 48Ca(11B,p2n) reactions at a beam energy of 32 MeV. The Cologne plunger device surrounded by a γ-detector array of one EUROBALL cluster detector and five Ge detectors was employed to determine lifetimes with the recoil distance Doppler shift method. γγ-coincidence data were analyzed using the differential decay curve method and precise lifetimes for the first 2+ and 4+ state of τ=5.49(14) ps and τ=3.15(11) ps, respectively, were extracted. The corresponding B(E2; 2+→0+)=11.33(31) W.u. quantifies with a high accuracy the puzzling discrepancy between experimental B(E2) values in N=32 isotones and theoretical results from large-scale shell model calculations employing modern effective nucleon-nucleon interactions.