The kaon spectrometer at SIS

Senger, P.; Ahner, W.; Baltes, P.; Beckerle, P.; Bormann, C.; Brill, Dieter R.; Cieślak, M.; Grosse, E.; Henning, W.; Koczoń, P.; Kohlmeyer, B.; Konrad, W.; Miśkowiec, D.; Müntz, C.; Oeschler, H.; Pöppl, H.; Prokopowicz, W.; Pühlhofer, F.; Sartorius, Alexander; Schicker, R.; Schlei, B. R.; Schwab, E.; Shin, Y.; Speer, John G.; Stein, J.; Stiebing, K. E.; Stock, R.; Ströbele, H.; Sturm, C.; Völkel, K.; Wagner, A.; Waluś, W.

doi:10.1016/0168-9002(93)90706-n

Cited by 99 publications

(24 citation statements)

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“…The present incident energy has several advantages compared to those used in Refs. [8,9]: (i) due to the strong forward focusing of the reaction products the magnetic spectrometer KaoS [10] was used for a kinematically complete measurement with high detection efficiency over a wider range of the p-7 Be relative energy; (ii) effects that obscure the dominant contribution of E1 multipolarity to the CD, such as E2 admixtures and higher-order contributions, are reduced [11,12]; (iii) the M1 resonance peak at E rel = 0.63 MeV is excited stronger and therefore can be used to check the accuracy of the invariant-mass calculation.…”

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“…A 8 B beam was produced by fragmentation of a 350 MeV/nucleon 12 C beam from the SIS synchrotron impinging on an 8.01 g/cm 2 beryllium target. The beam was isotopically separated in the fragment separator (FRS) [13] and transported to the standard target position of the spectrometer KaoS [10]. The average beam energy of 8 B at the center of the breakup target was 254.0 MeV/nucleon, a typical 8 B intensity was 10 4 /spill with 7s extraction time.…”

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confidence: 99%

“…A large-area (180 × 40 cm 2 ) scintillator wall [10] consisting of 30 plastic scintillator paddles with a thickness of 2 cm each was placed just behind the MWPC. It served as a trigger detector for the data acquisition system and as a stop detector for time-of-flight (TOF) measurements.…”

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Measurement of the Coulomb Dissociation of8Bat 254 MeV/nucleon and the

et al. 1999

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We have measured the Coulomb dissociation of 8 B into 7 Be and proton at 254 MeV/nucleon using a large-acceptance focusing spectrometer. The astrophysical S17 factor for the 7 Be (p,γ) 8 B reaction at Ec.m. = 0.25 − 2.78 MeV is deduced yielding S17(0) = 20.6±1.2 (exp.) ± 1.0 (theo.) eV-b. This result agrees with the presently adopted zero-energy S17 factor obtained in direct-reaction measurements and with the results of other Coulomb-dissociation studies performed at 46.5 and 51.2 MeV/nucleon. PACs: 25.40.Lw, 25.70.De, 26.65.+t The precise knowledge of the solar thermonuclear fusion of 8 B (from 7 Be plus proton) is crucial for estimating the 8 B solar neutrino flux and the predicted neutrino rates in terrestrial neutrino measurements. The relevant 7 Be(p,γ) 8 B cross section σ(E) is parameterized in terms of the astrophysical factor S 17 (E) which is defined by2 /hv is the Sommerfeld parameter. The flux of 8 B solar neutrinos is particularly important for the results of the Homestake, Super Kamiokande, and SNO experiments [1] which measure high-energy solar neutrinos mainly or solely from the 8 B decay. Unfortunately, this cross section has not been known with sufficient accuracy for a long time, despite the fact that several comprehensive direct measurements were reported for the 7 Be(p,γ) 8 B reaction [2][3][4][5][6]. The main difficulty in such experiments is the determination of the effective target thickness of the radioactive 7 Be target. This difficulty is reflected in the fact that the results of these measurements can be grouped into two distinct data sets which agree in their energy dependence but disagree in their absolute normalization by about 30%. In view of this discrepancy, experimental studies with different methods are highly desirable.As an alternative approach one can measure the inverse process, the Coulomb dissociation (CD) of 8 B into 7 Be and proton [7]. The CD yields are enhanced because thicker targets can be used and a larger phase space is available for CD. This method uses stable targets and thus is free from the difficulty of determining the effective target thickness. On the other hand, direct (p,γ) and Coulomb dissociation measurements have different sensitivities to the multipole composition of the photon fields. The E2 amplitude is enhanced in CD due to the large flux of E2 virtual photons, whereas it can be neglected in the (p,γ) reaction.Recently, Motobayashi et al. have performed a CD experiment at E( 8 B) = 46.5 MeV/nucleon, yielding values for S 17 in the energy range 0.6−1.7 MeV [8]. The extracted (p,γ) cross section is consistent with the results from the lower group of direct-reaction data points [4][5][6]. Another measurement at 51.9 MeV/nucleon by the same group with improved accuracy led essentially to the same conclusion [9].In this article, we report on an experiment of the CD of 8 B at a higher energy of 254 MeV/nucleon performed at the SIS facility at GSI, Darmstadt, Germany. The present incident energy has several advantages compared to those used in Refs. ...

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Measurement of the Coulomb Dissociation of8Bat 254 MeV/nucleon and the

et al. 1999

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“…An in-beam plastic scintillator (BC-418) of 200 µm thickness was used to provide a timezero signal for the time-of-flight measurements as well as to count beam particles. The plastic Forward Wall (FW) of the KaoS collaboration, see [39], comprising 380 plastic scintillators (BC408) was positioned 520 cm downstream of the target. The modules have a thickness of 2.54 cm with sizes 4x4 cm 2 in the center, followed by 8x8 cm 2 and 16x16 cm 2 elements in the outer region.…”

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confidence: 99%

Elliptic flow of ν ands π 0 mesons in heavy-ion collisions at 2 A GeVmesons in heavy-ion collisions at 2 A GeV

Taranenko

Куглер

2000

Czech J Phys

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Azimuthal distributions of η and π 0 mesons emitted at midrapidity in collisions of 1.9 AGeV 58 Ni+ 58 Ni and 2 AGeV 40 Ca+ nat Ca are studied as a function of the number of projectile-like spectator nucleons. The observed anisotropy corresponds to a negative elliptic flow signal for η mesons, indicating a preferred emission perpendicular to the reaction plane. In contrast, only small azimuthal anisotropies are observed for π 0 mesons. This may indicate that η mesons freeze out earlier from the fire ball than pions.

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“…The same holds for SIS energies if strangeness conservation is treated canonically [4]. In the following K + and K − spectra measured recently in Au + Au and Ni + Ni collisions at 1.5 AGeV with the Kaon Spectrometer [5] at SIS/GSI will be presented as a function of centrality as well as the respective polar angle distributions. A general overview of KaoS results is given in the talk of C.Sturm.…”

Section: Introductionmentioning

confidence: 99%

Kaon and antikaon production in heavy ion collisions at 1.5 A GeV

Förster

2002

J. Phys. G: Nucl. Part. Phys.

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Abstract.At the Kaon Spectrometer KaoS at SIS, GSI the production of kaons and antikaons in heavy ion reactions at a beam energy of 1.5 AGeV has been measured for the collision systems Ni + Ni and Au + Au. The K − /K + ratio is found to be constant for both systems and as a function of impact parameter but the slopes of K + and K − spectra differ for all impact parameters. Furthermore the respective polar angle distributions will be presented as a function of centrality.

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The kaon spectrometer at SIS

Cited by 99 publications

References 9 publications

Measurement of the Coulomb Dissociation of8Bat 254 MeV/nucleon and the

Measurement of the Coulomb Dissociation of8Bat 254 MeV/nucleon and the

Elliptic flow of ν ands π 0 mesons in heavy-ion collisions at 2 A GeVmesons in heavy-ion collisions at 2 A GeV

Kaon and antikaon production in heavy ion collisions at 1.5 A GeV

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