Proton-Induced Deuteron Breakup at E lab P = 65 MeV in Quasi-Free Scattering Configurations

Allet, M.; Bodek, K.; Hajdas, W.; Lang, J.; Müller, R.; Navert, S.; Naviliat‐Cuncic, O.; Sromicki, J.; Zejma, J.; Jarczyk, L.; Kistryn,; Smyrski, J.; Strzalkowski, A.; Witała, H.; Glöckle, W.; Golak, J.; Hüber, D.; Kamada, H.

doi:10.1007/s006010050029

Cited by 25 publications

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“…A strong influence of Coulomb effects and the general success of the theoretical calculations incorporating this long range interaction were confirmed [26]. The importance of relativistic calculations for describing the breakup reaction cross section has been shown at energies as low as 65 MeV ( [27] using data from [28,29]). The calculations will be further tested by comparing with results of the breakup cross section measurements performed with the WASA detector at COSY [31] in the energy range where predicted relativistic effects exceed 30% [30].…”

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confidence: 78%

Dynamics of Three-Nucleon System Studied in Deuteron–Proton Breakup Experiments

et al. 2017

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Systems composed of three nucleons have been a subject of precise experimental studies for many years. Recently, the database of observables for the deuteron breakup in collision with protons has been significantly extended at intermediate energies. In this region the comparison with exact theoretical calculations is possible, while the sensitivity to various aspects of the interaction, in particular to the subtle effects of the dynamics beyond the pairwise nucleon-nucleon force, is significant. The Coulomb interaction and relativistic effects show also their influence on the observables of the breakup reaction. All these effects vary with energy and appear with different strength in certain observables and phase-space regions, which calls for systematic investigations of a possibly rich set of observables determined in a wide range of energies. Moreover, a systematic comparison with theoretical predictions performed in coordinates related to the system dynamics in a possibly direct way is of importance. The examples of existing experimental data for the breakup reaction are briefly presented and the amenability of a set of invariant coordinates for that type of analysis is discussed.

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confidence: 78%

Dynamics of Three-Nucleon System Studied in Deuteron–Proton Breakup Experiments

et al. 2017

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“…There have been several reports on a large discrepancy in cross section of QFS both in nd breakup [53,54] and in pd breakup [47][48][49]55]. For example, nd QFS cross section around E n = 25 MeV is 16-18% higher than the calculation, and pd QFS cross section is lower than the calculation by about 20% at E p = 19 MeV and about 10% at 10.5 MeV.…”

Section: Qfs Anomaly At Low Energymentioning

confidence: 94%

Experimental Investigations of Discrepancies in Three-Nucleon Reactions

Sagara

2010

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Experiments on pd scattering, pd capture and pd breakup performed by our Kyushu University group since 1988 are reviewed. Various discrepancies between the experimental results and 3N Faddeev calculations have been found, and systematical measurements of the discrepancies have been made. From discrepancies in pd scattering cross section and in 3N binding energy, 2π-exchange 3N force was determined, and the discrepancies were satisfactorily diminished. There are, however, still many discrepancies awaiting theoretical investigation, as described in this report. IntroductionA precise experimental study of three-nucleon (3N) reactions at Kyushu University Tandem Accelerator Laboratory (KUTL) was started in 1988. Before the 3N experiments, high-intensity polarized p-and d-beams had been already developed at KUTL to measure ( d, p) polarization transfer coefficients. These beams were used to obtain high-statistics 3N data. To obtain high-precision and reliable 3N data, experimental facilities were improved.Beam polarization and beam position on the target should be stable in order to obtain reliable data. Also beam intensity should be stable to correctly estimate counting efficiency of detectors. Beam polarization, integrated beam charge, and target thickness (gas pressure and length along the beam axis) should be accurately measured. To obtain high-statistic data, data acquisition speed should be fast enough to accumulate many counts with low counting loss. These requirements were not easily satisfied in a university laboratory.Our purpose for starting 3N experiments at that time was to find 3N forces and to solve A y puzzle. Numerical calculations of Faddeev equations were greatly developed in 1980's. Speeds of computers became faster every year. Koike and Heidenbauer pointed out presence of A y puzzle (1986) [1]. Faddeev calculations with realistic NN potentials instead of separable potentials were made first by Takemiya [2], then by Bochum group [3,4].We decided therefore, to obtain precise and systematic experimental data of 3N reactions. When the precise data were compared with reliable Faddeev calculations, shortage of 2N force (2NF) might appear as a discrepancy between the data and the calculations. The discrepancy might indicate effects of 3NF or other origins which we were looking for. If a discrepancy was confirmed, theoretical investigations would reveal its origin(s), which would be 3NF or others. On this thought, we started precise and systematic experiments on pd system at KUTL in 1988.By 2009 we have made many experiments on (a) pd scattering in a beam energy range of 2-18 MeV,

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“…(20)(21)(22)(23)(24)(25) m in i are the rest masses of the incoming particles and E in i (E i ) are the total energies of the incoming (outgoing) particles. The nonrelativistic forms of the cross sections are restored when all total energies are replaced by the corresponding masses.…”

Section: Relativistic and Nonrelativistic Breakup Cross Sectionmentioning

confidence: 99%

“…At higher energies the exclusive breakup cross sections have been measured below the pion production threshold at 65 MeV [24,25,26,27,28,29,30], 156 MeV [31], and 200 MeV [32]. In…”

Section: B Comparison To Exclusive Breakup Cross Section Datamentioning

confidence: 99%

Relativistic effects in exclusive neutron-deuteron breakup

2006

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We extended the study of relativistic effects in neutron-deuteron scattering to the exclusive breakup. To this aim we solved the three-nucleon Faddeev equation including such relativistic features as relativistic kinematics and boost effects at incoming neutron lab. energies E lab n = 65 MeV, 156 MeV and 200 MeV. As dynamical input a relativistic nucleon-nucleon interaction exactly on-shell equivalent to the CD Bonn potential has been used. We found that the magnitude of relativistic effects increases with the incoming neutron energy and, depending on the phase-space region, relativity can increase as well as decrease the nonrelativistic breakup cross section. In some regions of the breakup phase-space dynamical boost effects are important. For a number of measured exclusive cross sections relativity seems to improve the description of data.

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Proton-Induced Deuteron Breakup at E lab P = 65 MeV in Quasi-Free Scattering Configurations

Cited by 25 publications

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Dynamics of Three-Nucleon System Studied in Deuteron–Proton Breakup Experiments

Dynamics of Three-Nucleon System Studied in Deuteron–Proton Breakup Experiments

Experimental Investigations of Discrepancies in Three-Nucleon Reactions

Relativistic effects in exclusive neutron-deuteron breakup

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