Measurement of small-angle elastic scattering of pions and protons by nuclei

Blieden, H.R.; Finocchiaro, G.; Goldhaber, Alfred S.; Grannis, P. D.; Green, D.; Hietarinta, Jarmo; Hochman, D.; Kephart, R.; Kirz, Janos; Lee, Y. Y.; Nef, C.; Thun, R.; Faissler, W.; Tang, Y. W.

doi:10.1103/physrevd.11.14

Cited by 10 publications

(6 citation statements)

References 33 publications

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“…The default values of the parameters of thepN amplitude are β n = β p = 12.7 GeV 2 , σ n = σ p = 55 mb and α n = α p = −0.08, while the parameters β n = β p = 10.1 GeV 2 , σ n = σ p = 40 mb and The data points are from ref. [49]. The influence of the slopes, β n and β p , on dσ/dΩ lab is rather weak (Fig.…”

Section: Shown Inmentioning

confidence: 93%

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Elastic scattering, polarization and absorption of relativistic antiprotons on nuclei

Larionov

Lenske

2017

Nuclear Physics A

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We perform Glauber model calculations of the antiproton-nucleus elastic and quasielastic scattering and absorption in the beam momentum range ∼ 0.5 ÷ 10 GeV/c. A good agreement of our calculations with available LEAR data and with earlier Glauber model studies of thepA elastic scattering allows us to make predictions at the beam momenta of ∼ 10 GeV/c, i.e. at the regime of the PANDA experiment at FAIR. The comparison with the proton-nucleus elastic scattering cross sections shows that the diffractive minima are much deeper in thepA case due to smaller absolute value of the ratio of the real-to-imaginary part of the elementary elastic amplitude. Significant polarization signal forpA elastic scattering at 10 GeV/c is expected. We have also revealed a strong dependence of thepA absorption cross section on the slope parameter of the transverse momentum dependence of the elementarypN amplitude. ThepA optical potential is discussed.

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Section: Shown Inmentioning

confidence: 93%

“…GeV/c and on lead at 19.85 GeV/c in comparison to the AGS@BNL data [49]. Since the contribution of quasielastic (QE) scattering is not subtracted in the data [49], we included the QE scattering in our calculations too as discussed in subsec. 2.4.…”

Section: Elastic and Quasielastic Scattering Polarizationmentioning

confidence: 99%

Elastic scattering, polarization and absorption of relativistic antiprotons on nuclei

Larionov

Lenske

2017

Nuclear Physics A

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“…For a CF 3 I target, a measured scattering angle corresponds to a different recoil energy depending on which nucleus is involved in the interaction; in this paper, we will refer to iodine equivalent recoil energy, E Ie , as the energy given to an iodine nucleus for a given pion scattering angle. For a 12 GeV/c pion beam, approximately 75% of the rate of pions scattering into angles corresponding to E Ie between 5 and 20 keV is due to elastic scattering on iodine, with smaller contributions from carbon, fluorine, and inelastic scattering [12]. Therefore, the bubble nucleation efficiency for iodine recoils in a bubble chamber with Seitz threshold between 5 and 20 keV can be inferred from a measurement of the fraction of pionscattering events that nucleate bubbles in the chamber as a function of E Ie .…”

Section: Experimental Designmentioning

confidence: 99%

Direct measurement of the bubble-nucleation energy threshold in aCF3Ibubble chamber

et al. 2013

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We have directly measured the energy threshold and efficiency for bubble nucleation from iodine recoils in a CF3I bubble chamber in the energy range of interest for a dark matter search. These interactions cannot be probed by standard neutron calibration methods, so we develop a new technique by observing the elastic scattering of 12 GeV/c negative pions. The pions are tracked with a silicon pixel telescope and the reconstructed scattering angle provides a measure of the nuclear recoil kinetic energy. The bubble chamber was operated with a nominal threshold of (13.6 ± 0.6) keV. Interpretation of the results depends on the response to fluorine and carbon recoils, but in general we find agreement with the predictions of the classical bubble nucleation theory. This measurement confirms the applicability of CF3I as a target for spin-independent dark matter interactions and represents a novel technique for calibration of superheated fluid detectors. PACS numbers: 29.40.-n, 95.35.+d, 95.30.Cq, FERMILAB-PUB-10-318-A-CD-ERecent years have seen a resurgence in the use of superheated liquids and bubble chambers as continuously sensitive nuclear recoil detectors searching for dark matter in the form of Weakly Interacting Massive Particles (WIMPs) [1][2][3]. At a low degree of superheat, bubble chambers are insensitive to minimum ionizing backgrounds that normally plague WIMP searches but retain sensitivity to the nuclear recoils that would be characteristic of WIMP scattering. In a superheated liquid the process of radiation-induced bubble nucleation is described by the classical "hot spike" model [4]. For the phase transition to occur, the energy deposited by the particle must create a critically sized bubble, requiring a minimum energy deposition in a volume smaller than the critical bubble. Under mildly superheated conditions, the latter requirement renders the bubble chamber insensitive to minimum ionizing particles.The radius of the critical bubble is given by the condition that the bubble be in (unstable) equilibrium with the surrounding superheated fluid [5]. This demands the pressure balancewhere P b is the pressure inside the bubble, P l is the pressure in the liquid, σ is the bubble surface tension, and r c is the critical bubble radius. The pressure P b is fixed by the condition that the chemical potential inside and outside the bubble be equal, givingwhere P sat is the pressure in a saturated system at the given temperature, and ρ l and ρ v are the liquid and vapor densities in the saturated system [6].In Seitz's "hot spike" model for bubble nucleation, the entire energy necessary to create the critical bubble must come from the particle interaction that nucleates the bubble. This is in contrast to earlier models that required only the work (free energy) to come from the particle interaction, with the remaining bubble-formation energy supplied by heat flowing in from the surrounding superheated fluid [7]. As the name "hot spike" implies, the nucleation site in Seitz's model begins as a hightemperature seed, so i...

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“…Pion production data at low momenta and in the forward region from incident pions are extremely scarce [9]. HARP is the first experiment to provide a high statistics data set, taken with many different targets, full particle identification and large-acceptance detector.…”

Section: Introductionmentioning

confidence: 99%

Forward production of charged pions with incident π± on nuclear targets measured at the CERN PS

et al. 2009

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Measurements of the double-differential π ± production cross-section in the range of momentum 0.5 GeV/c ≤ p ≤ 8.0 GeV/c and angle 0.025 rad ≤ θ ≤ 0.25 rad in interactions of charged pions on beryllium, carbon, aluminium, copper, tin, tantalum and lead are presented. These data represent the first experimental campaign to systematically measure forward pion hadroproduction.The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN PS. Incident particles, impinging on a 5% nuclear interaction length target, were identified by an elaborate system of beam detectors. The tracking and identification of the produced particles was performed using the forward spectrometer of the HARP detector. Results are obtained for the doubledifferential cross-sections d 2 σ/dpdΩ mainly at four incident pion beam momenta (3 GeV/c,

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Measurement of small-angle elastic scattering of pions and protons by nuclei

Cited by 10 publications

References 33 publications

Elastic scattering, polarization and absorption of relativistic antiprotons on nuclei

Elastic scattering, polarization and absorption of relativistic antiprotons on nuclei

Direct measurement of the bubble-nucleation energy threshold in aCF3Ibubble chamber

Forward production of charged pions with incident π± on nuclear targets measured at the CERN PS

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