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Radiation hardness of plastic scintillators for the Tile Calorimeter of the ATLAS detector
/ Jivan, H (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Sideras-Haddad, E (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Erasmus, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Liao, S (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Madhuku, M (iThemba LABS) ; Peters, G (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Sekonya, K (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Solvyanov, O (CERN)
The radiation damage in polyvinyl toluene based plastic scintillator EJ200 obtained from ELJEN technology was investigated. This forms part of a comparative study conducted to aid in the upgrade of the Tile Calorimeter of the ATLAS detector during which the Gap scintillators will be replaced. [...]
2015 - 6 p.
- Published in : J. Phys.: Conf. Ser. 645 (2015) 012019
Fulltext: PDF; IOP Open Access article: PDF;
In : Workshop on High Energy Particle Physics, Johannesburg, South Africa, 11 - 13 Feb 2015, pp.012019
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2.
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Radiation hardness of plastic scintillators for the Tile Calorimeter of the ATLAS detector
/ Jivan, H (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Mellado, B (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sideras-Haddad, E (U. Witwatersrand, Johannesburg, Sch. Phys. ; Pretoria, CSIR) ; Erasmus, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Liao, S (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Madhuku, M (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Peters, G (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Solvyanov, O (CERN)
The radiation damage in polyvinyl toluene based plastic scintillator EJ200 obtained from ELJEN technology was investigated. This forms part of a comparative study conducted to aid in the upgrade of the Tile Calorimeter of the ATLAS detector during which the Gap scintillators will be replaced. [...]
2015 - 7 p.
- Published in : J. Phys.: Conf. Ser. 623 (2015) 012016
IOP Open Access article: PDF;
In : Kruger2014: The International Workshop on Discovery Physics at the LHC, Skukuza, Mpumulanga, South Africa, 1 - 5 Dec 2014, pp.012016
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3.
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Neutron induced radiation damage of plastic scintillators for the upgrade of the Tile Calorimeter of the ATLAS detector.
/ Mdhluli, J E (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Jivan, H (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Erasmus, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Davydov, Yu I (Dubna, JINR) ; Baranov, V (Dubna, JINR) ; Mthembu, S (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mellado, B (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sideras-Haddad, E (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Solovyanov, O (Serpukhov, IHEP) ; Sandrock, C (U. Witwatersrand, Johannesburg, Sch. Phys.) et al.
With the prediction that the plastic scintillators in the gap region of the Tile Calorimeter will sustain a significantly large amount of radiation damage during the HL-LHC run time, the current plastic scintillators will need to be replaced during the phase 2 upgrade in 2018. The scintillators in the gap region were exposed to a radiation environment of up to 10 kGy/year during the first run of data taking and with the luminosity being increased by a factor of 10, the radiation environment will be extremely harsh. [...]
2017 - 7 p.
- Published in : J. Phys.: Conf. Ser. 878 (2017) 012008
In : Kruger2016 - Workshop on Discovery Physics at the LHC, Mpumulanga, South Africa, 4 - 9 Dec 2016, pp.012008
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4.
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Characterization of a potential 4-$\alpha$ cluster state
/ Neveling, R (iThemba LABS) ; Li, K C W (NITheP, Matieland) ; Adsley, P (iThemba LABS ; NITheP, Matieland) ; Papka, P (iThemba LABS ; NITheP, Matieland) ; Smit, F D (iThemba LABS) ; Brümmer, J W (NITheP, Matieland) ; Freer, M (Birmingham U.) ; Kokalova, Tz (Birmingham U.) ; Nemulodi, F (iThemba LABS ; NITheP, Matieland) ; Pellegri, L (iThemba LABS ; U. Witwatersrand, Johannesburg, Sch. Phys.) et al.
Geneva : CERN, 2015
Published version from CERN: PDF;
In : 14th International Conference on Nuclear Reaction Mechanisms, Villa Monastero, Varenna, Italy, 15 - 19 Jun 2015, pp.79
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5.
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The anomalous production of multi-lepton and its impact on the measurement of $Wh$ production at the LHC
/ Hernandez, Yesenia (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Kumar, Mukesh (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Cornell, Alan S. (Johannesburg U.) ; Dahbi, Salah-Eddine (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Fang, Yaquan (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Lieberman, Benjamin (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mellado, Bruce (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Monnakgotla, Kgomotso (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ruan, Xifeng (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Xin, Shuiting (Beijing, GUCAS ; Beijing, Inst. High Energy Phys.)
Anomalies in multi-lepton final states at the Large Hadron Collider (LHC) have been reported in Refs.~\cite{vonBuddenbrock:2017gvy,vonBuddenbrock:2019ajh}. These can be interpreted in terms of the production of a heavy boson, $H$, decaying into a Standard Model (SM) Higgs boson, $h$, and a singlet scalar, $S$, which is treated as a SM Higgs-like boson. [...]
arXiv:1912.00699.-
2021-04-27 - 13 p.
- Published in : Eur. Phys. J. C 81 (2021) 365
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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6.
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Accumulating evidence for the associated production of a new Higgs boson at the LHC
/ Crivellin, Andreas (Zurich U. ; PSI, Villigen ; CERN) ; Fang, Yaquan (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Fischer, Oliver (Liverpool U.) ; Bhattacharya, Srimoy (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Kumar, Mukesh (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Malwa, Elias (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mellado, Bruce (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Rapheeha, Ntsoko (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ruan, Xifeng (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sha, Qiyu (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS)
In the last decades, the Standard Model (SM) of particle physics has been extensively tested and confirmed, with the announced discovery of the Higgs boson in 2012 being the last missing puzzle piece. Even though since then the search for new particles and interactions has been further intensified, the experiments ATLAS and CMS at the Large Hadron Collider (LHC) at CERN did not find evidence for the direct production of a new state. [...]
arXiv:2109.02650; ICPP-057; PSI-PR-21-21; ZU-TH 38/21; CERN-TH-2021-129; LTH 1267.-
2023-12-01 - 9 p.
- Published in : Phys. Rev. D 108 (2023) 115031
Fulltext: 2109.02650 - PDF; Publication - PDF;
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7.
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Lattice sites, charge states and spin–lattice relaxation of Fe ions in 57Mn+ implanted GaN and AlN
/ Masenda, H (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Naidoo, D (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Bharuth-Ram, K (DUT, Durban ; iThemba LABS) ; Gunnlaugsson, H P (CERN ; KU Leuven, Dept. Phys. Astron.) ; Johnston, K (CERN) ; Mantovan, R (CNR-IMM Agrate Brianza, Italy) ; Mølholt, T E (CERN) ; Ncube, M (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Shayestehaminzadeh, S (RWTH Aachen U.) ; Gíslason, H P (Iceland U.) et al.
The lattice sites, valence states, resulting magnetic behaviour and spin–lattice relaxation of Fe ions in GaN and AlN were investigated by emission Mössbauer spectroscopy following the implantation of radioactive $^{57}Mn^+$ ions at ISOLDE/CERN. Angle dependent measurements performed at room temperature on the 14.4 keV γ-rays from the 57Fe Mössbauer state (populated from the $^{57}$Mn $β ^−$ decay) reveal that the majority of the Fe ions are in the 2+ valence state nearly substituting the Ga and Al cations, and/or associated with vacancy type defects. [...]
2016 - 9 p.
- Published in : J. Magn. Magn. Mater. 401 (2016) 1130-1138
Fulltext: PDF;
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8.
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Atomic-Scale Magnetic Properties of Truly 3d-Diluted ZnO
/ Mantovan, Roberto (IMM-CNR, Agrate Brianza,Italy) ; Gunnlaugsson, Haraldur Páll (Leuven U. ; Aarhus U.) ; Johnston, Karl (CERN) ; Masenda, Hilary (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mølholt, Torben Esmann (Iceland U.) ; Naidoo, Deena (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ncube, Mehluli (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Shayestehaminzadeh, Seyedmohammad (Iceland U.) ; Bharuth-Ram, Krish (DUT, Durban ; iThemba LABS) ; Fanciulli, Marco (IMM-CNR, Agrate Brianza,Italy ; Milan Bicocca U.) et al.
In search for dilute magnetic semiconductors, the magnetic properties at the atomic-scale of Fe atoms incorporated in ZnO, in a concentration range of more than five orders of magnitude from $1 × 10^{−5}$ to 2.2 at% have been probed using emission 57 Fe Mössbauer spectroscopy on implanted $^{57}Mn$ and $^{57}Co$ produced at ISOLDE/CERN. In the ultra-dilute regime ($10 ^{−5}$ at%), the system shows isolated paramagnetic $Fe^{3+}$ ions with a spin–lattice type of relaxation. [...]
2015
- Published in : Advanced Electronic Materials 1 (2015) 1400039
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9.
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Computing challenges in the certification of ATLAS Tile Calorimeter front-end electronics during maintenance periods
/ Solans, C (CERN) ; Carrio, F (Valencia U., IFIC) ; Kim, H Y (Texas U., Arlington) ; Moreno, P (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Reed, R (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sandrock, C (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ruan, X (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Shalyugin, A (Dubna, JINR) ; Schettino, V (Juiz de Fora U.) ; Souza, J (Juiz de Fora U.) et al.
After two years of operation of the LHC, the ATLAS Tile calorimeter is undergoing the consolidation process of its front-end electronics. [...]
ATL-TILECAL-PROC-2013-015.
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2014. - 5 p.
Original Communication (restricted to ATLAS) - Full text
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