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Grzonka D, Alfs D, Asaturyan A, Carmignotto M, Diermaier M, Eyrich W, Głowacz B, Hauenstein F, Horn T, Kilian K, Lersch D, Malbrunot-Ettenauer S, Mkrtchyan A, Mkrtchyan H, Moskal P, Nadel-Turonski P, Oelert W, Ritman J, Sefzick T, Tadevosyan V, Widmann E, Wolke M, Zhamkochyan S, Zieliński M, Zink A, Zmeskal J. Polarization analysis of p̄ produced in pA collisions. EPJ Web Conf 2019. [DOI: 10.1051/epjconf/201919905013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A quite simple procedure for the generation of a polarized antiproton beam could be worked out if antiprotons are produced with some polarization. In order to investigate this possibility measurements of the polarization of produced antiprotons have been started at a CERN/PS test beam. The polarization will be determined from the asymmetry of the elastic antiproton scattering at a liquid hydrogen target in the CNI region for which the analyzing power is well known. The data are under analysis and an additional measurement is done in 2018. Details on the experiment and the ongoing data analysis will be given.
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2
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Alfs D, Asaturyan A, Carmignotto M, Diermaier M, Eyrich W, Głowacz B, Grzonka D, Hauenstein F, Horn T, Kilian K, Lersch D, Malbrunot-Ettenauer S, Mkrtchyan A, Mkrtchyan H, Moskal P, Nadel-Turonski P, Oelert W, Ritman J, Sefzick T, Tadevosyan V, Widmann E, Wolke M, Zhamkochyan S, Zieliński M, Zink A, Zmeskal J. Drift chamber calibration and particle identification in the P-349 experiment. EPJ Web Conf 2019. [DOI: 10.1051/epjconf/201919905017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The goal of the P-349 experiment is to test whether 3.5 GeV/c antiprotons produced in high-energy proton-proton collisions are polarized in view of the preparation of a polarized antiproton beam. In this article, we present the details of the ongoing analysis focused on the drift chambers calibration and particle identification with DIRC.
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3
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Alfs D, Asaturyan A, Carmignotto M, Diermaier M, Eyrich W, Głowacz B, Grzonka D, Hauenstein F, Horn T, Kilian K, Malbrunot-Ettenauer S, Mkrtchyan A, Mkrtchyan H, Moskal P, Nadel-Turonski P, Oelert W, Ritman J, Sefzick T, Tadevosyan V, Widmann E, Wolke M, Zhamkochyan S, Zieliński M, Zink A, Zmeskal J. Status of the analysis for the search of polarization in the antiproton production process. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201613007002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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4
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Czerwiński E, Moskal P, Silarski M, Bass SD, Grzonka D, Kamys B, Khoukaz A, Klaja J, Krzemień W, Oelert W, Ritman J, Sefzick T, Smyrski J, Täschner A, Wolke M, Zieliński M. Determination of the η(')-proton scattering length in free space. Phys Rev Lett 2014; 113:062004. [PMID: 25148320 DOI: 10.1103/physrevlett.113.062004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Indexed: 06/03/2023]
Abstract
Taking advantage of both the high mass resolution of the COSY-11 detector and the high energy resolution of the low-emittance proton beam of the cooler synchrotron COSY, we determine the excitation function for the pp→ppη(') reaction close to threshold. Combining these data with previous results, we extract the scattering length for the η(')-proton potential in free space to be Re(a(pη(')))=0±0.43 fm and Im(a(pη(')))=0.37(-0.16)(+0.40) fm.
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Affiliation(s)
- E Czerwiński
- Institute of Physics, Jagiellonian University, PL-30-059 Cracow, Poland
| | - P Moskal
- Institute of Physics, Jagiellonian University, PL-30-059 Cracow, Poland
| | - M Silarski
- Institute of Physics, Jagiellonian University, PL-30-059 Cracow, Poland
| | - S D Bass
- Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, A 1090 Vienna, Austria
| | - D Grzonka
- Institute for Nuclear Physics and Jülich Center for Hadron Physics, Research Center Jülich, D-52425 Jülich, Germany
| | - B Kamys
- Institute of Physics, Jagiellonian University, PL-30-059 Cracow, Poland
| | - A Khoukaz
- IKP, Westfälische Wilhelms-Universität, D-48149 Münster, Germany
| | - J Klaja
- Institute of Physics, Jagiellonian University, PL-30-059 Cracow, Poland
| | - W Krzemień
- Institute of Physics, Jagiellonian University, PL-30-059 Cracow, Poland
| | - W Oelert
- Johannes Gutenberg-Universität Mainz, 550099 Mainz, Germany
| | - J Ritman
- Institute for Nuclear Physics and Jülich Center for Hadron Physics, Research Center Jülich, D-52425 Jülich, Germany
| | - T Sefzick
- Institute for Nuclear Physics and Jülich Center for Hadron Physics, Research Center Jülich, D-52425 Jülich, Germany
| | - J Smyrski
- Institute of Physics, Jagiellonian University, PL-30-059 Cracow, Poland
| | - A Täschner
- IKP, Westfälische Wilhelms-Universität, D-48149 Münster, Germany
| | - M Wolke
- Department of Physics and Astronomy, Uppsala University, SE-751 20 Uppsala, Sweden
| | - M Zieliński
- Institute of Physics, Jagiellonian University, PL-30-059 Cracow, Poland
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5
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DiSciacca J, Marshall M, Marable K, Gabrielse G, Ettenauer S, Tardiff E, Kalra R, Fitzakerley DW, George MC, Hessels EA, Storry CH, Weel M, Grzonka D, Oelert W, Sefzick T. One-particle measurement of the antiproton magnetic moment. Phys Rev Lett 2013; 110:130801. [PMID: 23581304 DOI: 10.1103/physrevlett.110.130801] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Indexed: 06/02/2023]
Abstract
For the first time a single trapped antiproton (p) is used to measure the p magnetic moment μ(p). The moment μ(p)=μ(p)S/(ℏ/2) is given in terms of its spin S and the nuclear magneton (μ(N)) by μ(p)/μ(N)=-2.792 845±0.000 012. The 4.4 parts per million (ppm) uncertainty is 680 times smaller than previously realized. Comparing to the proton moment measured using the same method and trap electrodes gives μ(p)/μ(p)=-1.000 000±0.000 005 to 5 ppm, for a proton moment μ(p)=μ(p)S/(ℏ/2), consistent with the prediction of the CPT theorem.
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Affiliation(s)
- J DiSciacca
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
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6
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Gabrielse G, Kalra R, Kolthammer WS, McConnell R, Richerme P, Grzonka D, Oelert W, Sefzick T, Zielinski M, Fitzakerley DW, George MC, Hessels EA, Storry CH, Weel M, Müllers A, Walz J. Trapped antihydrogen in its ground state. Phys Rev Lett 2012; 108:113002. [PMID: 22540471 DOI: 10.1103/physrevlett.108.113002] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2011] [Indexed: 05/31/2023]
Abstract
Antihydrogen atoms (H¯) are confined in an Ioffe trap for 15-1000 s-long enough to ensure that they reach their ground state. Though reproducibility challenges remain in making large numbers of cold antiprotons (p¯) and positrons (e(+)) interact, 5±1 simultaneously confined ground-state atoms are produced and observed on average, substantially more than previously reported. Increases in the number of simultaneously trapped H¯ are critical if laser cooling of trapped H¯ is to be demonstrated and spectroscopic studies at interesting levels of precision are to be carried out.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
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7
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Gabrielse G, Kolthammer WS, McConnell R, Richerme P, Kalra R, Novitski E, Grzonka D, Oelert W, Sefzick T, Zielinski M, Fitzakerley D, George MC, Hessels EA, Storry CH, Weel M, Müllers A, Walz J. Adiabatic cooling of antiprotons. Phys Rev Lett 2011; 106:073002. [PMID: 21405511 DOI: 10.1103/physrevlett.106.073002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Indexed: 05/30/2023]
Abstract
Adiabatic cooling is shown to be a simple and effective method to cool many charged particles in a trap to very low temperatures. Up to 3×10(6) p are cooled to 3.5 K-10(3) times more cold p and a 3 times lower p temperature than previously reported. A second cooling method cools p plasmas via the synchrotron radiation of embedded e(-) (with many fewer e(-) than p in preparation for adiabatic cooling. No p are lost during either process-a significant advantage for rare particles.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
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8
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Gabrielse G, Kolthammer WS, McConnell R, Richerme P, Wrubel J, Kalra R, Novitski E, Grzonka D, Oelert W, Sefzick T, Zielinski M, Borbely JS, Fitzakerley D, George MC, Hessels EA, Storry CH, Weel M, Müllers A, Walz J, Speck A. Centrifugal separation of antiprotons and electrons. Phys Rev Lett 2010; 105:213002. [PMID: 21231298 DOI: 10.1103/physrevlett.105.213002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2010] [Indexed: 05/30/2023]
Abstract
Centrifugal separation of antiprotons and electrons is observed, the first such demonstration with particles that cannot be laser cooled or optically imaged. The spatial separation takes place during the electron cooling of trapped antiprotons, the only method available to produce cryogenic antiprotons for precision tests of fundamental symmetries and for cold antihydrogen studies. The centrifugal separation suggests a new approach for isolating low energy antiprotons and for producing a controlled mixture of antiprotons and electrons.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
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9
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Czerwiński E, Moskal P, Grzonka D, Czyzykiewicz R, Gil D, Kamys B, Khoukaz A, Klaja J, Klaja P, Krzemień W, Oelert W, Ritman J, Sefzick T, Siemaszko M, Silarski M, Smyrski J, Täschner A, Wolke M, Wüstner P, Zdebik J, Zieliński M, Zipper W. Determination of the total width of the η' meson. Phys Rev Lett 2010; 105:122001. [PMID: 20867630 DOI: 10.1103/physrevlett.105.122001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Indexed: 05/29/2023]
Abstract
Taking advantage of both the low-emittance proton beam of the cooler synchrotron COSY and the high momentum precision of the COSY-11 detector system, the mass distribution of the η' meson was measured with a resolution of 0.33 MeV/c2 (FWHM), improving the experimental mass resolution by almost an order of magnitude with respect to previous results. Based on the sample of more than 2300 reconstructed pp → ppη' events, the total width of the η' meson was determined to be Γ(η') = 0.226 ± 0.017(stat) ± 0.014(syst) MeV/c2.
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Affiliation(s)
- E Czerwiński
- Institute of Physics, Jagiellonian University, PL-30-059 Cracow, Poland.
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10
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Gabrielse G, Larochelle P, Le Sage D, Levitt B, Kolthammer WS, McConnell R, Richerme P, Wrubel J, Speck A, George MC, Grzonka D, Oelert W, Sefzick T, Zhang Z, Carew A, Comeau D, Hessels EA, Storry CH, Weel M, Walz J. Antihydrogen production within a Penning-Ioffe trap. Phys Rev Lett 2008; 100:113001. [PMID: 18517780 DOI: 10.1103/physrevlett.100.113001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Indexed: 05/26/2023]
Abstract
Slow antihydrogen (H) is produced within a Penning trap that is located within a quadrupole Ioffe trap, the latter intended to ultimately confine extremely cold, ground-state H[over ] atoms. Observed H[over ] atoms in this configuration resolve a debate about whether positrons and antiprotons can be brought together to form atoms within the divergent magnetic fields of a quadrupole Ioffe trap. The number of detected H atoms actually increases when a 400 mK Ioffe trap is turned on.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, MA 02138, USA.
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11
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Czyzykiewicz R, Moskal P, Adam HH, Budzanowski A, Czerwiński E, Gil D, Grzonka D, Hodana M, Janusz M, Jarczyk L, Kamys B, Khoukaz A, Kilian K, Klaja P, Lorentz B, Oelert W, Piskor-Ignatowicz C, Przerwa J, Rejdych B, Ritman J, Sefzick T, Siemaszko M, Smyrski J, Täschner A, Ulbrich K, Winter P, Wolke M, Wüstner P, Zipper W. Mechanism of near-threshold production of the eta meson. Phys Rev Lett 2007; 98:122003. [PMID: 17501114 DOI: 10.1103/physrevlett.98.122003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2006] [Indexed: 05/15/2023]
Abstract
Measurements of the analyzing power for the pp-->pp eta reaction have been performed at excess energies of Q=10 and 36 MeV. The determined analyzing power is essentially consistent with zero, implying dominance of the s wave at both excess energies. The angular dependence of the analyzing power, combined with the isospin dependence of the total cross section for the eta meson production in nucleon-nucleon collisions, reveal that the excitation of the nucleon to the S11(1535) resonance is predominantly due to the exchange of the pi meson between the colliding nucleons.
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Affiliation(s)
- R Czyzykiewicz
- Institute of Physics, Jagellonian University, 30-059 Cracow, Poland
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12
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Gabrielse G, Larochelle P, Le Sage D, Levitt B, Kolthammer WS, Kuljanishvili I, McConnell R, Wrubel J, Esser FM, Glückler H, Grzonka D, Hansen G, Martin S, Oelert W, Schillings J, Schmitt M, Sefzick T, Soltner H, Zhang Z, Comeau D, George MC, Hessels EA, Storry CH, Weel M, Speck A, Nillius F, Walz J, Hänsch TW. Antiproton confinement in a Penning-Ioffe trap for antihydrogen. Phys Rev Lett 2007; 98:113002. [PMID: 17501048 DOI: 10.1103/physrevlett.98.113002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Indexed: 05/15/2023]
Abstract
Antiprotons (p[over]) remain confined in a Penning trap, in sufficient numbers to form antihydrogen (H[over ) atoms via charge exchange, when the radial field of a quadrupole Ioffe trap is added. This first demonstration with p[over] suggests that quadrupole Ioffe traps can be superimposed upon p[over] and e(+) traps to attempt the capture of H[over] atoms as they form, contrary to conclusions of previous analyses.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
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13
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Storry CH, Speck A, Le Sage D, Guise N, Gabrielse G, Grzonka D, Oelert W, Schepers G, Sefzick T, Pittner H, Herrmann M, Walz J, Hänsch TW, Comeau D, Hessels EA. First laser-controlled antihydrogen production. Phys Rev Lett 2004; 93:263401. [PMID: 15697977 DOI: 10.1103/physrevlett.93.263401] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2004] [Indexed: 05/24/2023]
Abstract
Lasers are used for the first time to control the production of antihydrogen (H ). Sequential, resonant charge exchange collisions are involved in a method that is very different than the only other method used so far-producing slow H during positron cooling of antiprotons in a nested Penning trap. Two attractive features are that the laser frequencies determine the H binding energy, and that the production of extremely cold H should be possible in principle-likely close to what is needed for confinement in a trap, as needed for precise laser spectroscopy.
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Affiliation(s)
- C H Storry
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
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14
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Gabrielse G, Speck A, Storry CH, LeSage D, Guise N, Grzonka D, Oelert W, Schepers G, Sefzick T, Pittner H, Walz J, Hänsch TW, Comeau D, Hessels EA. First measurement of the velocity of slow antihydrogen atoms. Phys Rev Lett 2004; 93:073401. [PMID: 15324235 DOI: 10.1103/physrevlett.93.073401] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2004] [Indexed: 05/24/2023]
Abstract
The speed of antihydrogen atoms is deduced from the fraction that passes through an oscillating electric field without ionizing. The weakly bound atoms used for this first demonstration travel about 20 times more rapidly than the average thermal speed of the antiprotons from which they form, if these are in thermal equilibrium with their 4.2 K container. The method should be applicable to much more deeply bound states, which may well be moving more slowly, and should aid the quest to lower the speed of the atoms as required if they are to be trapped for precise spectroscopy.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
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15
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Gabrielse G, Bowden NS, Oxley P, Speck A, Storry CH, Tan JN, Wessels M, Grzonka D, Oelert W, Schepers G, Sefzick T, Walz J, Pittner H, Hänsch TW, Hessels EA. Driven production of cold antihydrogen and the first measured distribution of antihydrogen states. Phys Rev Lett 2002; 89:233401. [PMID: 12485006 DOI: 10.1103/physrevlett.89.233401] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2002] [Indexed: 05/24/2023]
Abstract
Cold antihydrogen is produced when antiprotons are repeatedly driven into collisions with cold positrons within a nested Penning trap. Efficient antihydrogen production takes place during many cycles of positron cooling of antiprotons. A first measurement of a distribution of antihydrogen states is made using a preionizing electric field between separated production and detection regions. Surviving antihydrogen is stripped in an ionization well that captures and stores the freed antiproton for background-free detection.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
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16
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Bassalleck B, Berdoz A, Bradtke C, Bröders R, Bunker B, Dennert H, Dutz H, Eilerts S, Eyrich W, Fields D, Fischer H, Franklin G, Franz J, Gehring R, Geyer R, Goertz S, Harmsen J, Hauffe J, Heinsius FH, Hertzog D, Johansson T, Jones T, Khaustov P, Kilian K, Kingsberry P, Kriegler E, Lowe J, Meier A, Metzger A, Meyer CA, Meyer W, Moosburger M, Oelert W, Paschke KD, Plückthun M, Pomp S, Quinn B, Radtke E, Reicherz G, Röhrich K, Sachs K, Schmitt H, Schoch B, Sefzick T, Stinzing F, Stotzer R, Tayloe R, Wirth S. Measurement of spin-transfer observables in p p-->Lambda Lambda at 1.637 GeV/c. Phys Rev Lett 2002; 89:212302. [PMID: 12443404 DOI: 10.1103/physrevlett.89.212302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2002] [Indexed: 05/24/2023]
Abstract
Spin-transfer observables for p p-->Lambda Lambda have been measured using a transversely polarized frozen-spin target and a beam momentum of 1.637 GeV/c. Current models of the reaction near threshold are in good agreement with existing measurements performed with unpolarized particles in the initial state but produce conflicting predictions for the spin-transfer observables Dnn and Knn (the normal-to-normal depolarization and polarization transfer), which are measurable only with polarized target or beam. Measurements of Dnn and Knn presented here are found to be in disagreement with predictions from these models.
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Affiliation(s)
- B Bassalleck
- University of New Mexico, Albuquerque, New Mexico 87131, USA
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17
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Gabrielse G, Bowden NS, Oxley P, Speck A, Storry CH, Tan JN, Wessels M, Grzonka D, Oelert W, Schepers G, Sefzick T, Walz J, Pittner H, Hänsch TW, Hessels EA. Background-free observation of cold antihydrogen with field-ionization analysis of its states. Phys Rev Lett 2002; 89:213401. [PMID: 12443407 DOI: 10.1103/physrevlett.89.213401] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2002] [Indexed: 05/24/2023]
Abstract
A background-free observation of cold antihydrogen atoms is made using field ionization followed by antiproton storage, a detection method that provides the first experimental information about antihydrogen atomic states. More antihydrogen atoms can be field ionized in an hour than all the antimatter atoms that have been previously reported, and the production rate per incident high energy antiproton is higher than ever observed. The high rate and the high Rydberg states suggest that the antihydrogen is formed via three-body recombination.
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Affiliation(s)
- G Gabrielse
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
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18
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Brodowski W, Bilger R, Calén H, Clement H, Ekström C, Fransson K, Greiff J, Häggström S, Höistad B, Johanson J, Johansson A, Johansson T, Kilian K, Kullander S, Kupść A, Marciniewski P, Morosov B, Oelert W, Pätzold J, Ruber RJMY, Schepkin M, Scobel W, Seluzhenkov I, Stepaniak J, Sukhanov A, Turowiecki A, Wagner GJ, Wilhelmi Z, Zabierowski J, Zlomanczuk J. Exclusive measurement of the pp --> pppi(+)pi(-) reaction near threshold. Phys Rev Lett 2002; 88:192301. [PMID: 12005625 DOI: 10.1103/physrevlett.88.192301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2001] [Indexed: 05/23/2023]
Abstract
The pp-->pp pi(+) pi(-) reaction has been measured exclusively near threshold at CELSIUS. The total cross sections are nearly an order of magnitude lower than expected from previous inclusive measurements. The differential cross sections reveal pp-->pp(*)(1440)-->pp sigma = pp(pi(+)pi(-))(I = l = 0) as the dominant process as well as significant contributions from p(*)-->Delta(++)pi(-)-->psigma. The observed anisotropy in the proton angular dependence is consistent with heavy-meson exchange. In the invariant mass spectra, no narrow structures of statistical relevance (3sigma) are found.
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Affiliation(s)
- W Brodowski
- Physikalisches Institut der Universität Tübingen, Morgenstelle 14, D-72076 Tübingen, Germany
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Barnes PD, Franklin G, Quinn B, Schumacher RA, Zeps V, Hamann N, Dutty W, Fischer H, Franz J, Rössle E, Schmitt H, Todenhagen R, Frankenberg RV, Kilian K, Oelert W, Röhrich K, Sachs K, Sefzick T, Ziolkowski M, Eisenstein RA, Harris PG, Hertzog DW, Hughes SA, Reimer PE, Tayloe RL, Eyrich W, Geyer R, Kirsch M, Kraft RA, Stinzing F, Johansson T, Ohlsson S. Measurement of the p-barp--> Lambda -bar Lambda and p-barp--> Sigma -bar 0 Lambda +c.c. reactions at 1.726 and 1.771 GeV/c. Phys Rev C Nucl Phys 1996; 54:2831-2842. [PMID: 9971655 DOI: 10.1103/physrevc.54.2831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Barnes PD, Diebold G, Franklin G, Quinn B, Schumacher R, Seydoux J, Zeps V, Birien P, Dutty W, Fischer H, Franz J, Rössle E, Schledermann H, Schmitt H, Todenhagen R, Breunlich W, Nägele N, Bröders R, Frankenberg R, Kilian K, Oelert W, Röhrich K, Sachs K, Sefzick T, Sehl G, Ziolkowski M, Eisenstein RA, Hertzog D, Tayloe R, Dennert H, Eyrich W, Geyer R, Hauffe J, Hofmann A, Kirsch M, Kraft RA, Stinzing F, Hamann N, Johansson T, Ohlsson S. Observables in high-statistics measurements of the reaction p-barp--> Lambda -bar Lambda. Phys Rev C Nucl Phys 1996; 54:1877-1886. [PMID: 9971536 DOI: 10.1103/physrevc.54.1877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Jarczyk L, Kamys B, Magiera A, Rudy Z, Strzalkowski A, Styczen B, Hebenstreit J, Oelert W, Seyfarth H. Elastic and inelastic transfer in the 11B+12C system at 164.8 MeV c.m. energy. Phys Rev C Nucl Phys 1992; 46:1393-1397. [PMID: 9968246 DOI: 10.1103/physrevc.46.1393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Bojowald J, Machner H, Nann H, Oelert W, Rogge M, Turek P. Elastic deuteron scattering and optical model parameters at energies up to 100 MeV. Phys Rev C Nucl Phys 1988; 38:1153-1163. [PMID: 9954917 DOI: 10.1103/physrevc.38.1153] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Jarczyk J, Kamys B, Rudy Z, Strzalkowski A, Styczen B, Berg GP, Magiera A, Meissburger J, Oelert W, Römer JG, Tain JL, Wolter HH, Kwasniewicz E, Kisiel J. Multinucleon transfer reactions with 7Li. Phys Rev C Nucl Phys 1986; 33:934-936. [PMID: 9953224 DOI: 10.1103/physrevc.33.934] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Jarczyk L, Kamys B, Rudy Z, Strzalkowski A, Styczen B, Berg GPA, Magiera A, Mei�burger J, Oelert W, Rossen P, R�mer JGM, Kwasniewicz E. Triton and helion transfer in the10B(?,7Li)7Be reaction atE lab=91.8 MeV. ACTA ACUST UNITED AC 1985. [DOI: 10.1007/bf01411886] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Budzanowski A, Baur G, Shyam R, Bojowald J, Oelert W, Riepe G, Rogge M, Turek P, R�sel F, Trautmann D. Experimental and theoretical study of the elastic break-up of the alpha particle on58Ni nuclei atE ?=172.5 MeV. ACTA ACUST UNITED AC 1979. [DOI: 10.1007/bf01435271] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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