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Publications (31)

nucl-ex2010

Delta Delta Excitation in Proton-Proton Induced pi0pi0 Production

T. Skorodko, M. Bashkanov, D. Bogoslawsky +37

Exclusive measurements of the $pp \to pp I ¨ ^{0} I ¨ ^{0}$ reaction have been performed at CELSIUS/WASA at energies from threshold up to $T_{p}$ = 1.3 GeV. Total and differential cross sectio…

nucl-ex2004

The in-medium isovector pi N amplitude from low energy pion scattering

E. Friedman, M. Bauer, J. Breitschopf +8

Differential cross sections for elastic scattering of 21.5 MeV positive and negative pions by Si, Ca, Ni and Zr have been measured as part of a study of the pion-nucleus potential…

nucl-ex2001

$I ¨ \to I ¨ I ¨ $ results in nuclei

P. Camerini, E. Fragiacomo, N. Grion +10

The Crystal Ball ( $C B$ ) collaboration at $B N L$ has recently presented results regarding a study of the $I ¨ ^{-} A \to I ¨ ^{0} I ¨ ^{0} A^{'}$ reaction on $H, D, C, A l$ and $C u$ , using a ne…

astro-ph1998

A Candidate Substellar Companion to CoD -33 7795 (TWA 5)

P. J. Lowrance, C. McCarthy, E. E. Becklin +12

We present the discovery of a candidate substellar object in a survey of young stars in the solar vicinity using the sensitivity and spatial resolution afforded by the NICMOS coron…

nucl-ex2008

Two-Pion Production in Proton-Proton Collisions with Polarized Beam

S. Abd El-Bary, S. Abd El-Samad, R. Bilger +46

The two-pion production reaction $p p \to pp I ¨ ^{+} I ¨ ^{-}$ was measured with a polarized proton beam at $T_{p} \approx$ 750 and 800 MeV using the short version of the COSY-TOF spectro…

cond-mat.mes-hall2006

Bias dependent inversion of tunneling magnetoresistance in Fe/GaAs/Fe tunnel junctions

J. Moser, M. Zenger, C. Gerl +10

We investigated spin dependent transport through Fe/GaAs/Fe tunnel junctions. The tunneling magnetoresistance effect (TMR) was probed for different types of Fe/GaAs interfaces. For…

nucl-ex2010

Exclusive Measurement of the $pp \to nn I ¨ ^{+} I ¨ ^{+}$ Reaction at 1.1 GeV

M. Bashkanov, D. Bogoslawsky, H. Calen +36

First exclusive data for the $pp \to nn I ¨ ^{+} I ¨ ^{+}$ reaction have been obtained at CELSIUS with the WASA detector setup at a beam energy of $T_{p}$ = 1.1 GeV. Total and differential cro…

nucl-ex2008

The WASA Detector Facility at CELSIUS

Chr. Bargholtz, M. Bashkanov, M. BerÅowski +81

The WASA 4pi multidetector system, aimed at investigating light meson production in light ion collisions and eta meson rare decays at the CELSIUS storage ring in Uppsala is present…

hep-ex2008

Measurement of eta meson decays into lepton-antilepton pairs

WASA Collaboration, M. BerÅowski, Chr. Bargholtz +50

A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta->e+e-e+e- events are reported with a b…

nucl-ex2009

Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements

M. Bashkanov, C. Bargholtz, M. Berlowski +46

The ABC effect - a puzzling low-mass enhancement in the $I ¨ I ¨ $ invariant mass spectrum - is well-known from inclusive measurements of two-pion production in nuclear fusion reaction…

nucl-ex2006

Two-Pion Production in Nucleon-Nucleon Collisions and the ABC-Effect - Approaching a Puzzleby exclusive and Kinematically complete Measurements

T. Skorodko, M. Bashkanov, C. Bargholtz +50

The ABC effect - a puzzling low-mass enhancement in the $I ¨ I ¨ $ invariant mass spectrum - is known from inclusive measurements of two-pion production in nuclear collisions, where it…

nucl-ex2005

The pi -> pi pi process in nuclei and the restoration of chiral symmetry

N. Grion, M. Bregant, P. Camerini +10

The results of an extensive campaign of measurements of the pi -> pi pi process in the nucleon and nuclei at intermediate energies are presented. The measurements were motivated by…

nucl-ex2005

Elastic scattering of low energy pions by nuclei and the in-medium isovector pi N amplitude

E. Friedman, M. Bauer, J. Breitschopf +9

Measurements of elastic scattering of 21.5 MeV pi+ and pi- by Si, Ca, Ni and Zr were made using a single arm magnetic spectrometer. Absolute calibration was made by parallel measur…

cond-mat.soft2010

Nuclear magnetic resonance measurements reveal the origin of the Debye process in monohydroxy alcohols

C. Gainaru, R. Meier, S. Schildmann +4

Monohydroxy alcohols show a structural relaxation and at longer time scales a Debye-type dielectric peak. From spin-lattice relaxation experiments using different nuclear probes an…

nucl-ex2004

General properties of the pion production reaction in nuclear matter

P. Camerini, E. Fragiacomo, N. Grion +14

The pion production reaction $I ¨ ^{+} \to I ¨ ^{+} I ¨ ^{\pm}$ on $^{45} S c$ was studied at incident pion energies of $T_{I ¨ ^{+}}$ = 240, 260, 280, 300, and 320 MeV. The experiment was perfor…

nucl-ex2006

Exclusive Measurements of $p d \to^{3} H e I ¨ I ¨ $ : the $A B C$ Effect Revisited

M. Bashkanov, D. Bogoslawsky, H. CalÃ©n +40

Exclusive measurements of the reactions $p d \to$ $^{3} H e I ¨ ^{+} I ¨ ^{-}$ and $p d \to$ $^{3} H e I ¨ ^{0} I ¨ ^{0}$ have been carried out at $T_{p} = 0.895$ GeV at the CELSIUS storage ring using the WASA det…

nucl-ex2006

Evidence for a 'Narrow' Roper Resonance - the Breathing Mode of the Nucleon

H. Clement, T. Skorodko, M. Bashkanov +43

All the time since its discovery the N $^{*}$ (1440) baryon state, commonly known as Roper resonance, has been a state with many question marks - despite of its 4-star ranking in the p…

nucl-ex2011

Exclusive Measurements of pp -> dpi+pi0: Double-Pionic Fusion without ABC Effect

F. Kren, M. Bashkanov, D. Bogoslawsky +37

Exclusive measurements of the reaction pp -> dpi+pi0 have been carried out at T_p = 1.1 GeV at the CELSIUS storage ring using the WASA detector. The isovector pi+pi0 channel exhibi…

nucl-ex2006

Single-Pion Production in pp Collisions at =.95 GeV/c (I)

S Abd El-Samad, R. Bilger, K. -Th. Brinkmann +41

The single-pion production reactions $pp \to d I ¨ ^{+}$ , $pp \to n p I ¨ ^{+}$ and $pp \to pp I ¨ ^{0}$ were measured at a beam momentum of 0.95 GeV/c ( $T_{p} \approx$ 400 MeV) using the short version…

nucl-ex2006

Pionic charge exchange on the proton from 40 to 250 MeV

J. Breitschopf, M. Bauer, H. Clement +6

The total cross sections for pionic charge exchange on hydrogen were measured using a transmission technique on thin CH2 and C targets. Data were taken for pi- lab energies from 39…

nucl-ex2009

Single-Pion Production in pp Collisions at 0.95 GeV/c (II)

S. Abd El-Samad, R. Bilger, K. Th. Brinkmann +41

hep-ex2004

Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp --> Sigma+ K0 p from the COSY-TOF experiment

M. Abdel-Bary, S. Abdel-Samad, K. -Th. Brinkmann +46

The hadronic reaction pp --> Sigma+ K0 p was measured exclusively at a beam momentum of 2.95 GeV/c using the TOF detector at the COSY storage ring. A narrow peak was observed in th…

nucl-ex2007

The pp -> pp pi pi pi reaction channels in the threshold region

WASA Collaboration, C. Pauly, M. Jacewicz +42

The cross section for prompt neutral and charged three pion production in pp interactions was measured at excess energies in the range 160 - 217 MeV. That comprises the first measu…

nucl-ex2004

Low Energy Analyzing Powers in Pion-Proton Elastic Scattering

R. Meier, M. CrÃ¶ni, R. Bilger +17

Analyzing powers of pion-proton elastic scattering have been measured at PSI with the Low Energy Pion Spectrometer LEPS as well as a novel polarized scintillator target. Angular di…

nucl-ex2009

On the Production of $I ¨ ^{+} I ¨ ^{+}$ Pairs in pp Collisions at 0.8 GeV

S. Abd El-Samad, R. Bilger, K. -Th. Brinkmann +39

Data accumulated recently for the exclusive measurement of the $pp \to pp I ¨ ^{+} I ¨ ^{-}$ reaction at a beam energy of 0.793 GeV using the COSY-TOF spectrometer have been analyzed with res…

nucl-ex1998

The Reaction 7Li(pi+,pi-)7B and its Implications for 7B

J. Paetzold, R. Bilger, H. Clement +8

The reaction 7Li(pi+,pi-)7B has been measured at incident pion energies of 30-90 MeV. 7Li constitutes the lightest target nucleus, where the pionic charge exchange may proceed as a…

hep-ph1998

Search for Exotic Muon Decays

R. Bilger, K. Foehl, H. Clement +5

Recently, it has been proposed that the observed anomaly in the time distribution of neutrino induced reactions, reported by the KARMEN collaboration, can be interpreted as a signa…

nucl-ex2007

Measurement of the Slope Parameter for the eta->3pi0 Decay in the pp->pp eta Reaction

The CELSIUS/WASA setup is used to measure the 3pi0 decay of eta mesons produced in pp interactions with beam kinetic energies of 1.36 and 1.45 GeV. The efficiency-corrected Dalitz…

nucl-ex2005

pi+- p differential cross sections at low energies

H. Denz, P. Amaudruz, J. T. Brack +28

Differential cross sections for pi- p and pi+ p elastic scattering were measured at five energies between 19.9 and 43.3 MeV. The use of the CHAOS magnetic spectrometer at TRIUMF, s…

nucl-ex2009

Two-Pion Production in Proton-Proton Collisions -- Experimental Total Cross Sections and their Isospin Decomposition

T. Skorodko, M. Bashkanov, D. Bogoslawsky +37

The two-pion production in pp-collisions has been investigated at CELSIUS in exclusive measurements from threshold up to $T_{p}$ = 1.36 GeV. Total and differential cross sections hav…

hep-ex2006

Measurement of the eta->pi+pi-e+e- decay branching ratio

WASA Collaboration, Chr. Bargholtz, M. Bashkanov +48

The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi…

Publications (31)

Delta Delta Excitation in Proton-Proton Induced pi0pi0 Production

The in-medium isovector pi N amplitude from low energy pion scattering

I¨→I¨I¨ results in nuclei

A Candidate Substellar Companion to CoD -33 7795 (TWA 5)

Two-Pion Production in Proton-Proton Collisions with Polarized Beam

Bias dependent inversion of tunneling magnetoresistance in Fe/GaAs/Fe tunnel junctions

Exclusive Measurement of the pp→nnI¨+I¨+ Reaction at 1.1 GeV

The WASA Detector Facility at CELSIUS

Measurement of eta meson decays into lepton-antilepton pairs

Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements

Two-Pion Production in Nucleon-Nucleon Collisions and the ABC-Effect - Approaching a Puzzleby exclusive and Kinematically complete Measurements

The pi -> pi pi process in nuclei and the restoration of chiral symmetry

Elastic scattering of low energy pions by nuclei and the in-medium isovector pi N amplitude

Nuclear magnetic resonance measurements reveal the origin of the Debye process in monohydroxy alcohols

General properties of the pion production reaction in nuclear matter

Exclusive Measurements of pd→3HeI¨I¨ : the ABC Effect Revisited

Evidence for a 'Narrow' Roper Resonance - the Breathing Mode of the Nucleon

Exclusive Measurements of pp -> dpi+pi0: Double-Pionic Fusion without ABC Effect

Single-Pion Production in pp Collisions at =.95 GeV/c (I)

Pionic charge exchange on the proton from 40 to 250 MeV

Single-Pion Production in pp Collisions at 0.95 GeV/c (II)

Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp --> Sigma+ K0 p from the COSY-TOF experiment

The pp -> pp pi pi pi reaction channels in the threshold region

Low Energy Analyzing Powers in Pion-Proton Elastic Scattering

On the Production of I¨+I¨+ Pairs in pp Collisions at 0.8 GeV

The Reaction 7Li(pi+,pi-)7B and its Implications for 7B

Search for Exotic Muon Decays

Measurement of the Slope Parameter for the eta->3pi0 Decay in the pp->pp eta Reaction

pi+- p differential cross sections at low energies

Two-Pion Production in Proton-Proton Collisions -- Experimental Total Cross Sections and their Isospin Decomposition

Measurement of the eta->pi+pi-e+e- decay branching ratio

$I ¨ \to I ¨ I ¨ $ results in nuclei

Exclusive Measurement of the $pp \to nn I ¨ ^{+} I ¨ ^{+}$ Reaction at 1.1 GeV

Exclusive Measurements of $p d \to^{3} H e I ¨ I ¨ $ : the $A B C$ Effect Revisited

On the Production of $I ¨ ^{+} I ¨ ^{+}$ Pairs in pp Collisions at 0.8 GeV