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Probing structural transitions in M(II) vanadates (M = Zn, Mn, Cd, Ca) with TDPAC spectroscopy
/ Burimova, Anastasia (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Carbonari, Artur Wilson (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Heiniger-Schell, Juliana (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland; Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Leite Neto, Osmar Flavio da Silveira (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Saxena, Rajendra Narain (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Sales, Tatiane da Silva Nascimento (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Genezini, Frederico Antonio (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Pereira, Luciano Fabricio Dias (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Ribeiro Junior, Ibere Souza (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) ; Correa, Bruno Santos (Instituto de Pesquisas Energeticas e Nucleares, IPEN, Sao Paulo, SP, Brazil) et al.
CERN-INTC-2023-023 ; INTC-P-661.
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2023.
Fulltext
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Type-I Seesaw with eV-Scale Neutrinos
/ Branco, G.C. (Lisbon, CFTP) ; Penedo, J.T. (Lisbon, CFTP) ; Pereira, Pedro M.F. (Lisbon, CFTP) ; Rebelo, M.N. (Lisbon, CFTP ; CERN) ; Silva-Marcos, J.I. (Lisbon, CFTP)
We consider seesaw type-I models including at least one (mostly-)sterile neutrino with mass at the eV scale. Three distinct situations are found, where the presence of light extra neutrinos is naturally justified by an approximately conserved lepton number symmetry. [...]
arXiv:1912.05875.-
2020-07-23 - 43 p.
- Published in : JHEP 2007 (2020) 164
Article from SCOAP3: PDF; Fulltext: PDF;
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The peculiarities of reduction and doping of vanadium oxides probed by TDPAC spectroscopy at ISOLDE
/ Carbonari, Artur Wilson (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Saxena, Rajendra Narain (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Burimova, Anastasia (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Pereira, Luciano Fabricio Dias (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Sales, Tatiane da Silva Nascimento (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Leite Neto, Osmar Flávio da Silveira (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Genezini, Frederico Antonio (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Ribeiro Junior, Iberê Souza (Instituto de Pesquisas Energéticas e Nucleares. IPEN, São Paulo, SP, Brazil) ; Bosch-Santos, Brianna (Material Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA) ; Correa, Eduardo Lima (Material Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA) et al.
CERN-INTC-2020-031 ; INTC-P-532-ADD-1.
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2020.
Fulltext - Original Document (INTC-P-532)
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Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS
/ COMPASS Collaboration
Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron targets, and by the COMPASS experiment using the CERN SPS muon beam and a $^6$LiD target. [...]
arXiv:1912.10322; CERN-EP-2019-286.-
Geneva : CERN, 2020-07 - 13 p.
- Published in : Nucl. Phys. B 956 (2020) 115039
Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: 1912.10322 - PDF; CERN-EP-2019-286 - PDF;
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Magnetic field at Ce impurities in La sites of La$_{0.5}$Ba$_{0.5}$MnO$_{3}$ double perovskites
/ Bosch-Santos, B (Sao Paulo U.) ; Nascimento, N M (Sao Paulo U.) ; Saiki, M (Sao Paulo U.) ; Correa, E L (Sao Paulo U.) ; Sales, T S N (Sao Paulo U.) ; Pereira, L F D (Sao Paulo U.) ; Cabrera-Pasca, G A (Para U.) ; Saxena, R N (Sao Paulo U.) ; Schell, J (Duisburg-Essen U. ; CERN) ; Carbonari, A W (Sao Paulo U.)
Due to its rich variety of electromagnetic properties, such as a colossal magnetoresistance, charge and orbital ordering, and metal-insulator transition, the magnetic behavior in La$_{0.5}$Ba$_{0.5}$MnO$_{3}$ double perovskite compounds has been investigated by several techniques, however more experimental data, especially from atomic resolution techniques, are still necessary to understand such complex behavior. In this paper, we have used a nuclear and short-range technique, the Perturbed Angular Correlation (PAC) spectroscopy, to investigate the magnetic hyperfine interaction at the $^{140}$Ce and $^{111}$Cd probe nuclei as impurities occupying La sites. [...]
2019
- Published in : AIP Adv. 9 (2019) 035245
Fulltext: PDF;
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Measurement of the cross section for hard exclusive $\pi^0$ leptoproduction
/ COMPASS Collaboration
We report on a measurement of hard exclusive $\pi^0$ muoproduction on the proton by COMPASS using 160 GeV/$c$ polarised $\mu^+$ and $\mu^-$ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured $\mu^+$ and $\mu^-$ cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range $0.08\,(\text{GeV/}c)^2 < |t| < 0.64\,(\text{GeV/}c)^2$. [...]
arXiv:1903.12030; CERN-EP-2019-049.-
2020-06-10 - 9 p.
- Published in : Phys. Lett. B 805 (2020) 135454
Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from publisher: PDF;
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A New QCD facility at the M2 beam line of the CERN SPS: COMPASS++/AMBER
/ Adams, B. (Chicago U., EFI ; Xonics Inc.) ; Aidala, C.A. (Michigan U.) ; Akhunzyanov, R. (Dubna, JINR) ; Alexeev, G.D. (Dubna, JINR) ; Alexeev, M.G. (Turin U.) ; Amoroso, A. (Turin U. ; INFN, Turin) ; Andrieux, V. (Illinois U., Urbana) ; Anfimov, N.V. (Dubna, JINR) ; Anosov, V. (Dubna, JINR) ; Antoshkin, A. (Dubna, JINR) et al.
In this Letter of Intent, we propose a broad experimental programme for the ``New QCD facility at the M2 beam line of the CERN SPS''. [...]
arXiv:1808.00848 ; CERN-SPSC-2019-003 ; SPSC-I-250 ; SPSC-I-250.
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2019. - 91 p.
Full text - Fulltext
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Measurement of $P_T$-weighted Sivers asymmetries in leptoproduction of hadrons
/ COMPASS Collaboration
The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum $P_T$, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlation between the transverse momentum of an unpolarised quark in a transversely polarised nucleon and the spin of the nucleon. [...]
arXiv:1809.02936; CERN-EP-2018-242.-
Geneva : CERN, 2019-03 - 20 p.
- Published in : Nucl. Phys. B 940 (2019) 34-53
Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-242 - PDF; 1809.02936 - PDF;
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The novel photon detectors based on MPGD technologies for the upgrade of COMPASS RICH-1
/ Agarwala, J. (INFN, Trieste ; ICTP, Trieste) ; Alexeev, M. (INFN, Turin ; Turin U.) ; Azevedo, C.D.R. (Aveiro U.) ; Birsa, R. (INFN, Trieste) ; Bradamante, F. (INFN, Trieste ; U. Trieste (main)) ; Bressan, A. (INFN, Trieste ; U. Trieste (main)) ; Chatterjee, C. (INFN, Trieste ; U. Trieste (main)) ; Chiosso, M. (INFN, Turin ; Turin U.) ; Cicuttin, A. (INFN, Trieste ; ICTP, Trieste) ; Ciliberti, P. (INFN, Trieste ; U. Trieste (main)) et al.
The RICH-1 Detector of the COMPASS experiment at CERN SPS has undergone an important upgrade in 2016. Four new photon detectors, based on MPGD technology and covering a total active area larger than 1.2~m2 have replaced the previously used MWPC-based photon detectors. [...]
arXiv:1804.05765; AIDA-2020-CONF-2018-008
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Geneva : SISSA, 2018-04-13 - 7 p.
- Published in : PoS MPGD2017 (2019) 052
Fulltext: PoS(MPGD2017)052 - PDF; AIDA-2020-CONF-2018-008 - PDF; 1804.05765 - PDF;
In : 5th International Conference on Micro-Pattern Gas Detectors, Philadelphia, Pennsylvania, Pa, Usa, 22 - 26 May 2017, pp.052
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