High-Precision Proton-Proton Bremsstrahlung Measurements below the Pion-Production Threshold

Huisman, H.; Bacelar, J.; Goethem, van Marc-Jan; Harakeh, Mohsen; Hoefman, M.; Kalantar‐Nayestanaki, N.; Löhner, H.; Messchendorp, J. G.; Ostendorf, R.W.; Schadmand, S.; Scholten, Olaf; Timmermans, Robertus; Turrisi, R.; Volkerts, M.; Wilschut, Hans; Simon, R. S.; Куглер, А.; Wagner, V.

doi:10.1103/physrevlett.83.4017

Cited by 33 publications

(20 citation statements)

References 37 publications

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“…For collisions with E cm ≈ 100 − 200 MeV these comparisons show that the SRA provides a good description of the data for ω << E cm , and for ω E cm underestimates the cross-sections by about a factor of about 2 [23][24][25]. Systematic comparisons have also find that the SRA provides as good a description of nucleon-nucleon bremsstrahlung data as do potential models with the model dependent 2-body currents [23]. For these reasons we propose that leading order SRA is well suited to calculate emission and scattering rates of LVB and are preferrable to models based on a one-pion exchange which include a subset of corrections arising from a sub-class diagrams in Fig.…”

Section: Nucleon-nucleon Bremsstrahlung In the Soft Limitmentioning

confidence: 91%

Nucleon-nucleon bremsstrahlung of dark gauge bosons and revised supernova constraints

2016

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We calculate the rate of production of hypothetical light vector bosons (LVBs) from nucleonnucleon bremsstrahlung reactions in hot and dense matter. We use the soft radiation approximation and express the rates directly in terms of the measured nucleon-nucleon elastic differential cross sections. These results are combined with the observation of neutrinos from supernova SN1987a to deduce constraints on the couplings of vector bosons with masses 200 MeV to either electric charge (dark photons) or to baryon number. We establish for the first time strong constraints on LVB that couple only to baryon number, and revise earlier constraints on the dark photon. For the latter, we find that the excluded region of parameter space is diminished by about a factor of 10.

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Section: Nucleon-nucleon Bremsstrahlung In the Soft Limitmentioning

confidence: 91%

Nucleon-nucleon bremsstrahlung of dark gauge bosons and revised supernova constraints

2016

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“…The agreement between the theoretical predictions using the ROBE and the soft-photon TuTts amplitudes with both the highprecision Kernfysisch-Versneller-Institute (KVI) ppγ cross section data [32][33][34] and the TRIUMF ppγ cross section data [35] provides clear examples of the quantitative nature of the ROBE and soft-photon TuTts approaches to describing pp bremsstrahlung [7,8].…”

Section: Introductionmentioning

confidence: 68%

Neutrino-pair bremsstrahlung from nucleon-nucleon scattering

Liou

Schreiber

et al. 2015

Phys. Rev. C

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PACS number(s): 12.15. Ji, 13.75.Cs, 24.80.+y, 2 Abstract Background: Neutrino-pair bremsstrahlung processes from nucleon-nucleon scattering NNνν ( nnνν , ppνν , and npνν ) have recently attracted attention in studies of neutrino emission in neutron stars, because of the implications for the neutron star cooling. The calculated NNνν emissivities within the neutron star environment are relatively insensitive to the two-nucleon dynamical model used in the calculations, but differ significantly from those obtained using an OPE model. Purpose:We investigate the free NNνν cross sections using a realistic nucleon-nucleon scattering amplitude, comparing the relative sizes of the cross sections for the three processes nnνν , ppνν , and npνν .

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“…In particular, the elementary bremsstrahlung process for virtual and real photons has been studied in the pp system [13,14] and coherent bremsstrahlung in the a + p system [15]. To study the various medium effects the energy spectra and angular distributions of photons up to the kinematical limit were measured in reactions of 190 MeV protons with natural targets of C, Ni, Ag and Au.…”

Section: Methodsmentioning

confidence: 99%

Bremsstrahlung in the nuclear medium: Search for coherence phenomena

Wilschut¹,

Goethem²,

Löhner³

2000

Czech J Phys

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NPI [~e~ u Prahy, Czech Republic; IFIC Valencia, Spain Photon angular distributions and energy spectra up to the kinematical limit have been measured in proton reactions with light and heavy targets. For the first time the dependence of photon spectra on scattered protons has been measured to investigate the influence of multiple-scattering processes on the photon production. A strong suppression of bremsstrahlung relative to a quasi-free production model using the free pn bremsstrahlung cross section is observed in the low-energy regime of the photon spectrum in p -I-nucleus reactions. We attribute this effect to modifications of the bremsstrahlung amplitude in the nuclear medium and to interference of photon amplitudes due to multiple scattering of nucleons.

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High-Precision Proton-Proton Bremsstrahlung Measurements below the Pion-Production Threshold

Cited by 33 publications

References 37 publications

Nucleon-nucleon bremsstrahlung of dark gauge bosons and revised supernova constraints

Nucleon-nucleon bremsstrahlung of dark gauge bosons and revised supernova constraints

Neutrino-pair bremsstrahlung from nucleon-nucleon scattering

Bremsstrahlung in the nuclear medium: Search for coherence phenomena

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