429 research outputs found

    Calibration of the CMS hadron calorimeters using proton-proton collision data at root s=13 TeV

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    Methods are presented for calibrating the hadron calorimeter system of theCMSetector at the LHC. The hadron calorimeters of the CMS experiment are sampling calorimeters of brass and scintillator, and are in the form of one central detector and two endcaps. These calorimeters cover pseudorapidities vertical bar eta vertical bar ee data. The energy scale of the outer calorimeters has been determined with test beam data and is confirmed through data with high transverse momentum jets. In this paper, we present the details of the calibration methods and accuracy.Peer reviewe

    Medium lives in 132,133Ce and 136Pr

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    Vidas m√©dias de n√≠veis mais baixos nas bandas de 1 e 3 quase-part√≠culas em ANTPOT 133Ce foram medidas usando a t√©cnica de dist√Ęncia de recuo e deslocamento Doppler RDDS. As amplitudes das transi√ß√Ķes E2 extra√≠das dos estados yrast de paridade negativa s√£o bem descritas pelos modelos Rotor Triaxial + Quase-Part√≠cula e geom√©trico. Os valores de B(M1) extra√≠dos para os n√≠veis na banda de 3 quase-part√≠culas de paridade positiva est√£o consistentes com a atribui√ß√£o da configura√ß√£o Vh1l/2 (X) h 1l/2 (X) g7/2 para essa banda. Os n√≠veis no 132,133Ce foram populados pela rea√ß√£o ANTPOT 120 Sn (ANTPOT 16 O,4n,3n) ANTPOT 132,133Ce na energia incidente de 70 MeV. O feixe foi fornecido pelo acelerador Tandem do Laborat√≥rio Pelletron. Os dados foram obtidos usando um detetor HP Ge (22% de efici√™ncia, resolu√ß√£o de energia de 2.1keV) com supress√£o Compton BGO a 0¬į em rela√ß√£o ao feixe e um filtro de multiplicidades de 6 detetores 3\" x 3\" de NaI(Tl) num plano perpendicular ao plano da rea√ß√£o. O alvo foi produzido por evapora√ß√£o ed ANTPOT 120 Sn met√°lico sobre um substrato fino de ouro voltado na dire√ß√£o de incid√™ncia do feixe, enquanto que o anteparo (stopper) foi produzido em chumbo. Os n√ļcleos de recuo atingiram uma velocidade m√©dia de v= 0.008c. As medidas foram realizadas com um dispositivo plunger constru√≠do no Laborat√≥rio Pelletron. Os espectros foram obtidos para 13 diferentes dist√Ęncias alvo-stopper e foram normalizadas usando uma linha gama de 279 keV da excita√ß√£o Coulombiana do substrato de Au. As dist√Ęncias de v√īo alvo-stopper foram medidas usando a t√©cnica de capacit√Ęncia e tamb√©m com um micr√īmetro de precis√£o. As vidas m√©dias de estados de alto spin em ANTPOT 136 Pr, √≠mpar-√≠mpar, foram tamb√©m medidas usando a rea√ß√£o ANTPOT. 123 Sb (ANTPOT 16 O,3n) na energia incidente de 65 MeV. Os espectros de raios gama foram adquir√≠dos para 20 diferentes dist√Ęncias. O alvo foi confeccionado de ANTPOT 123 Sb de espessura de 1mg/cm¬≤, evaporado sobre um substrato de 2mg/cm¬≤ de Au. A an√°lise mostra que a vida m√©dia do estado 8+ da banda yrast (h1l/2) (X) v(h 1l / 2) √© de 1177 ¬Ī 64ps. Um limite superior para a vida m√©dia do estado 7- foi estabelecido em < 1ns.Lifetimes of the low-lying levels in the one and three quasiparticle bands in 133Ce have been measured using the recoil-distance Doppler-shift technique RDDS. The E2 transition strengths extracted for the negative parity yrast states are well described by the Triaxial-Rotor-plus-Quasipartide and the geometrical model. The B(M1) values extracted for the levels in the positive parity 3 quasipartide band are consistent with the Vh11/2 X h 11/2 g7/2 configuration assignment to this band. Levels in 132,133Ce were populated by the 120Sn(16O,4n,3n)132,133Ce reaction at an incident energy of 70 MeV. The beam was provided by the Tandem accelerator of the Pelletron Laboratory. Data were obtained using a BGO Compton suppressed HPGe detector (22% efficiency, energy resolution 2.1 keV) at 0¬į to the beam and a multiplicity filter of six 3\" x 3\" NaI(TI) detectors in a plane perpendicular to the reaction plane. The target was produced by evaporation of enriched metallic 120Sn onto a thin Au backing which faced the incident beam, while the stopper was of lead. The recoil nuclei had an average velocity of v = 0.008c. The measurements were performed with a plunger device constructed in our laboratory. Spectra were obtained for 13 different target-stopper distances and were normalized using the 279 keV gamma line from the Coulomb excitation of the Au backing. The target-stopper flight distances were measured using the capacitance technique and also with a precision micrometer. Lifetimes of the high spin states in odd-odd 136Pr were also measured using the 123Sb(16O,3n) reaction at an incident energy of 65 MeV. Gamma spectra were collected at about 20 different distances. The target was of enriched 123Sb 1mg/cm2 thick, evaporated onto a Au 2mg/cm2 backing. Analysis shows that the lifetime of the 8+ state in the yrast band (h11 2Z) X V (h11/2) is 1177 ¬Ī 64ps. An upper limit for the 7- state was stablished in < 1ns

    Study of rotational bands in 136 Pr by gamma spectroscopy line method.

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    Utilizando tecnicas de espectroscopia-GAMA em linha e reacoes do tipo (hi, xnypGAMA) que populam estados de alto spin estudou-se a estrutura do nucleo duplamente impar ANTPOT.136 PR atraves das reacoes ANTPOT.123 SB (ANTPOT.16 O, 3n)ANTPOT.136 PR e ANTPOT.126 TE (ANTPOT.14 N 4n)ANTPOT.136 PR. Foram realizadas medidas de funcoes de excitacao em quatro energias, e coincidencias GAMA-GAMA-t e distribuicoes angulares em 69mev e 56mev, respectivamente, utilizando detetores hpge de alta resolucao (2kev) e alvos de isotopos enriquecidos de ANTPOT.123 SB (99%) e ANTPOT.126 TE (94%) com espessuras de aproximadamente 9mg/CENTIMETROS QUADRADOS. O esquema de niveis de energia do ANTPOT.136 PR evidencia duas bandas rotacionais que populam um estado isomerico com meia-vida de 92ns. A banda yrast e caracterizada por um staggering em seus niveis de energia, com transicoes m1 intensas e e2 fracas baseada na configuracao PI (h ind.11/2) IND.1/2 TETA NI (h ind.11/2) IND.9/2, de acordo com a sistematica da regiao de massa a=130, mostrando um pequeno energy splitting de 40kev. Na banda secundaria pressupoe-se a configuracao PI (d ind.5/2) IND.3/2 TETA NI (h ind.11/2) IND.11/2. Os resultados experimentais foram interpretados com base no cranked shell model que predizem deformacoes GAMA pequenas e negativas na regiao dos LA e PRThe structure of the doubly odd nucleus 136pr has been studied using techniques of on-line -spectroscopy with the reactions 123Sb (16O,3n) 136 Pr and 126Te(14 N,4n)136 Pr populating high spin states. The excitation functions were measured at four energies, and - t coincidences and angular distributions at 69MeV and 56MeV , respectively, using high resolution HPGe detectors (2keV) and targets of enriched isotopes of 123 Sb (99%) and 126Te (94%) with thicknesses of approximately 9mg/cm². The energy level scheme of 136Pr shows two rotational bands which populate one isomeric state with a half-life of 92s. The Yrast band is characterized by the staggering in energy levels with intense M1 transitions and weak E2 transitions, based on a configuration (h11/2)1/2 v(h11/2)9/2 in agreemment with the sistematics of the mass region A = 130. There is a small energy splitting of 40keV. For the secondary band a configuration n(d5/2)3/2 (h11/2)11/2 is possible. Experimental results were interpreted within the framework of the Cranked Shell Model which predicts small negative deformations in the La and Pr region

    Study of rotational bands in 136 Pr by gamma spectroscopy line method.

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    Utilizando tecnicas de espectroscopia-GAMA em linha e reacoes do tipo (hi, xnypGAMA) que populam estados de alto spin estudou-se a estrutura do nucleo duplamente impar ANTPOT.136 PR atraves das reacoes ANTPOT.123 SB (ANTPOT.16 O, 3n)ANTPOT.136 PR e ANTPOT.126 TE (ANTPOT.14 N 4n)ANTPOT.136 PR. Foram realizadas medidas de funcoes de excitacao em quatro energias, e coincidencias GAMA-GAMA-t e distribuicoes angulares em 69mev e 56mev, respectivamente, utilizando detetores hpge de alta resolucao (2kev) e alvos de isotopos enriquecidos de ANTPOT.123 SB (99%) e ANTPOT.126 TE (94%) com espessuras de aproximadamente 9mg/CENTIMETROS QUADRADOS. O esquema de niveis de energia do ANTPOT.136 PR evidencia duas bandas rotacionais que populam um estado isomerico com meia-vida de 92ns. A banda yrast e caracterizada por um staggering em seus niveis de energia, com transicoes m1 intensas e e2 fracas baseada na configuracao PI (h ind.11/2) IND.1/2 TETA NI (h ind.11/2) IND.9/2, de acordo com a sistematica da regiao de massa a=130, mostrando um pequeno energy splitting de 40kev. Na banda secundaria pressupoe-se a configuracao PI (d ind.5/2) IND.3/2 TETA NI (h ind.11/2) IND.11/2. Os resultados experimentais foram interpretados com base no cranked shell model que predizem deformacoes GAMA pequenas e negativas na regiao dos LA e PRThe structure of the doubly odd nucleus 136pr has been studied using techniques of on-line -spectroscopy with the reactions 123Sb (16O,3n) 136 Pr and 126Te(14 N,4n)136 Pr populating high spin states. The excitation functions were measured at four energies, and - t coincidences and angular distributions at 69MeV and 56MeV , respectively, using high resolution HPGe detectors (2keV) and targets of enriched isotopes of 123 Sb (99%) and 126Te (94%) with thicknesses of approximately 9mg/cm². The energy level scheme of 136Pr shows two rotational bands which populate one isomeric state with a half-life of 92s. The Yrast band is characterized by the staggering in energy levels with intense M1 transitions and weak E2 transitions, based on a configuration (h11/2)1/2 v(h11/2)9/2 in agreemment with the sistematics of the mass region A = 130. There is a small energy splitting of 40keV. For the secondary band a configuration n(d5/2)3/2 (h11/2)11/2 is possible. Experimental results were interpreted within the framework of the Cranked Shell Model which predicts small negative deformations in the La and Pr region

    Medium lives in 132,133Ce and 136Pr

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    Vidas m√©dias de n√≠veis mais baixos nas bandas de 1 e 3 quase-part√≠culas em ANTPOT 133Ce foram medidas usando a t√©cnica de dist√Ęncia de recuo e deslocamento Doppler RDDS. As amplitudes das transi√ß√Ķes E2 extra√≠das dos estados yrast de paridade negativa s√£o bem descritas pelos modelos Rotor Triaxial + Quase-Part√≠cula e geom√©trico. Os valores de B(M1) extra√≠dos para os n√≠veis na banda de 3 quase-part√≠culas de paridade positiva est√£o consistentes com a atribui√ß√£o da configura√ß√£o Vh1l/2 (X) h 1l/2 (X) g7/2 para essa banda. Os n√≠veis no 132,133Ce foram populados pela rea√ß√£o ANTPOT 120 Sn (ANTPOT 16 O,4n,3n) ANTPOT 132,133Ce na energia incidente de 70 MeV. O feixe foi fornecido pelo acelerador Tandem do Laborat√≥rio Pelletron. Os dados foram obtidos usando um detetor HP Ge (22% de efici√™ncia, resolu√ß√£o de energia de 2.1keV) com supress√£o Compton BGO a 0¬į em rela√ß√£o ao feixe e um filtro de multiplicidades de 6 detetores 3\" x 3\" de NaI(Tl) num plano perpendicular ao plano da rea√ß√£o. O alvo foi produzido por evapora√ß√£o ed ANTPOT 120 Sn met√°lico sobre um substrato fino de ouro voltado na dire√ß√£o de incid√™ncia do feixe, enquanto que o anteparo (stopper) foi produzido em chumbo. Os n√ļcleos de recuo atingiram uma velocidade m√©dia de v= 0.008c. As medidas foram realizadas com um dispositivo plunger constru√≠do no Laborat√≥rio Pelletron. Os espectros foram obtidos para 13 diferentes dist√Ęncias alvo-stopper e foram normalizadas usando uma linha gama de 279 keV da excita√ß√£o Coulombiana do substrato de Au. As dist√Ęncias de v√īo alvo-stopper foram medidas usando a t√©cnica de capacit√Ęncia e tamb√©m com um micr√īmetro de precis√£o. As vidas m√©dias de estados de alto spin em ANTPOT 136 Pr, √≠mpar-√≠mpar, foram tamb√©m medidas usando a rea√ß√£o ANTPOT. 123 Sb (ANTPOT 16 O,3n) na energia incidente de 65 MeV. Os espectros de raios gama foram adquir√≠dos para 20 diferentes dist√Ęncias. O alvo foi confeccionado de ANTPOT 123 Sb de espessura de 1mg/cm¬≤, evaporado sobre um substrato de 2mg/cm¬≤ de Au. A an√°lise mostra que a vida m√©dia do estado 8+ da banda yrast (h1l/2) (X) v(h 1l / 2) √© de 1177 ¬Ī 64ps. Um limite superior para a vida m√©dia do estado 7- foi estabelecido em < 1ns.Lifetimes of the low-lying levels in the one and three quasiparticle bands in 133Ce have been measured using the recoil-distance Doppler-shift technique RDDS. The E2 transition strengths extracted for the negative parity yrast states are well described by the Triaxial-Rotor-plus-Quasipartide and the geometrical model. The B(M1) values extracted for the levels in the positive parity 3 quasipartide band are consistent with the Vh11/2 X h 11/2 g7/2 configuration assignment to this band. Levels in 132,133Ce were populated by the 120Sn(16O,4n,3n)132,133Ce reaction at an incident energy of 70 MeV. The beam was provided by the Tandem accelerator of the Pelletron Laboratory. Data were obtained using a BGO Compton suppressed HPGe detector (22% efficiency, energy resolution 2.1 keV) at 0¬į to the beam and a multiplicity filter of six 3\" x 3\" NaI(TI) detectors in a plane perpendicular to the reaction plane. The target was produced by evaporation of enriched metallic 120Sn onto a thin Au backing which faced the incident beam, while the stopper was of lead. The recoil nuclei had an average velocity of v = 0.008c. The measurements were performed with a plunger device constructed in our laboratory. Spectra were obtained for 13 different target-stopper distances and were normalized using the 279 keV gamma line from the Coulomb excitation of the Au backing. The target-stopper flight distances were measured using the capacitance technique and also with a precision micrometer. Lifetimes of the high spin states in odd-odd 136Pr were also measured using the 123Sb(16O,3n) reaction at an incident energy of 65 MeV. Gamma spectra were collected at about 20 different distances. The target was of enriched 123Sb 1mg/cm2 thick, evaporated onto a Au 2mg/cm2 backing. Analysis shows that the lifetime of the 8+ state in the yrast band (h11 2Z) X V (h11/2) is 1177 ¬Ī 64ps. An upper limit for the 7- state was stablished in < 1ns

    Measurement of the double-differential inclusive jet cross section in proton-proton collisions at s\sqrt{s} = 5.02 TeV