A measurement of the spin correlation parameter C NN (θ) in n-p scattering at 181 MeV

Sowinski, J. ; Byrd, R.C. ; Jacobs, W.W. ; et al.
Phys.Lett.B 199 (1987) 341-345, 1987.
Inspire Record 1392688 DOI 10.17182/hepdata.30055

The spin correlation parameter C NN has been measured for n-p elastic scattering at 181 MeV. A comparison with predictions from various phase shift sets and potential models reveals sizeable deviations from the for the data Paris potential and Saclay phase shifts. For the Paris potential the deviations are directly related to an overprediction of the 3 D 2 phase shift parameter.

1 data table

Numerical values of data supplied by J. Sowinski.


Elastic n-p charge-exchange scattering at 8 GeV/c

Manning, G. ; Parham, A.G. ; Jafar, J.D. ; et al.
Nuovo Cim.A 41 (1966) 167-188, 1966.
Inspire Record 1185251 DOI 10.17182/hepdata.1062

The differential cross-section for elastic charge-exchange scattering of neutrons on protons has been measured at 8 GeV/c over forward laboratory scattering angles (0÷90) mrad (square of four-momentum transfer 0<−t<0.5 (GeV/c)2). The method utilized acoustic spark chambers and about 1900 elastic-scattering events were analysed. A value of (dσ/dΩ)lab=(20±6) mb/sr (dσ/dt=(0.93±0.28) mb/(GeV/c)2) was obtained for the forward differential cross-section and an estimated (0.06±0.03) mb for the elastic charge exchange cross-section. Both cross-sections show the decreased values expected from Pomeranchuk’s second theorem (1) when compared with results at lower energies (2). Further comparison shows that the narrow forward peak in the distribution of dσ/dt previously observed for −t<0.05, is still present at 8 GeV/c, varying in shape only slowly, if at all, with energy. For −t>0.1 however, energy dependence is apparent. The results also suggest that the interaction is spin-dependent and/or that the real parts of the scattering amplitudes in the isospin states 0 and 1 are different. Comparisons with the theoretical predictions show good agreement with the value of forward cross-section given by the Regge pole approach ofAhmadzadeh (3). The model ofRingland andPhillips (4) for single-pion exchange with absorption agrees with our results for −t<0.01 but a predicted secondary peak at −t∼0.08 is not observed.

3 data tables

'2'. '3'.

'2'. '3'.

No description provided.


Measurement of the Absolute Differential Cross Section for np Elastic Scattering at 194 MeV

Sarsour, M. ; Peterson, T. ; Planinic, M. ; et al.
Phys.Rev.C 74 (2006) 044003, 2006.
Inspire Record 710735 DOI 10.17182/hepdata.31683

A tagged medium-energy neutron beam has been used in a precise measurement of the absolute differential cross section for np back-scattering. The results resolve significant discrepancies within the np database concerning the angular dependence in this regime. The experiment has determined the absolute normalization with 1.5% uncertainty, suitable to verify constraints of supposedly comparable precision that arise from the rest of the database in partial wave analyses. The analysis procedures, especially those associated with evaluation of systematic errors in the experiment, are described in detail so that systematic uncertainties may be included in a reasonable way in subsequent partial wave analysis fits incorporating the present results.

1 data table

Final differential cross sections averaged over data samples.


Measurement of spin observables in neutron proton elastic scattering. I: Correlation parameters

Arnold, J. ; van den Brandt, B. ; Daum, M. ; et al.
Eur.Phys.J.C 17 (2000) 67-81, 2000.
Inspire Record 537914 DOI 10.17182/hepdata.43392

The spin correlation parameters$A_{oonn}, A_{ooss}, A_{oosk}, A_{ookk}$and the analyzing power$A_{oono}$have been measured i

6 data tables

Values of the coefficients for the linear combinations of the spin correlation parameters Cpq measurements for the four different beam and target polarisation orientations. For the (z,z) and (y,y) configurations the coefficients are identical for all incident kinetic energies.

Measurement of the analysing power. Statistical errors only are shown. For the systematic errors see the systematics section above. Note that there are two overlapping angular settings.

Measurements of the spin correlation parameter CNN. Statistical errors onlyare shown. For the systematics see the systematic section above. Note the two overlapping angular settings.

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Measurement of spin observables in neutron proton elastic scattering. II: Rescattering parameters

Arnold, J. ; van den Brandt, B. ; Daum, M. ; et al.
Eur.Phys.J.C 17 (2000) 83-95, 2000.
Inspire Record 537915 DOI 10.17182/hepdata.43295

A double scattering experiment, performed at the Paul-Scherrer-Institut (PSI), has measured a large variety of spin observables for free np elastic scattering from 260 to 535 MeV in the c.m. angle ran

12 data tables

Relative uncertainties on the carbon polarimeter analysing power (AC).

Relative uncertainty in the beam polarisation (PB).

Measurements of DNN with statistical errors only.

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Spin observables in neutron proton elastic scattering.

Ahmidouch, A. ; Arnold, J. ; van den Brandt, B. ; et al.
Eur.Phys.J.C 2 (1998) 627-641, 1998.
Inspire Record 471273 DOI 10.17182/hepdata.11376

The analyzing power,$A_{oono}$, and the polarization transfer observables$K_{onno}$,$K_{os''so}$

20 data tables

Position 'A' (see text for explanation).

Position 'A' (see text for explanation).

Position 'A' (see text for explanation).

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Measurement of the spin correlation parameters A(00kk) and A(00sk) in n p elastic scattering at SATURNE-II

Ball, J. ; Chesny, P. ; Combet, M. ; et al.
Nucl.Phys.A 574 (1994) 697-715, 1994.
Inspire Record 383127 DOI 10.17182/hepdata.36564

We present a total of 191 and 203 data points of the elastic neutron-protonspin correlation parameters A ookk and A oosk , respectively. Both observables were measured in a large angular interval. The observable A ookk was measured from 0.312 to 1.10 GeV and A oosk from 0.80 to 1.10 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the polarized Saclay frozen-spin proton target. The beam polarization was oriented either along the beam direction or sideways, the target polarization was oriented longitudinally. Data are compared with phase-shift analyses predictions and with the PSI, LAMPF and SATURNE II results. Present results provide an important contribution to any future theoretical or phenomenological analysis.

14 data tables

No description provided.

No description provided.

No description provided.

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Measurements of the two and three spin index observables in n p elastic scattering between 0.8-GeV and 1.1-GeV

Ball, J. ; Chesny, P. ; Combet, M. ; et al.
Z.Phys.C 61 (1994) 579-585, 1994.
Inspire Record 377674 DOI 10.17182/hepdata.14208

We present data of several rescattering observables measured inn p elastic scattering between 0.80 and 1.10 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the Saclay polarized frozen-spin proton target. Three different configurations of beam and target polarization directions were used: the observablesDonon andKonno were measured with the normal-normal spin configuration at eight energies;Nonkk,Dos″ok andKos″ko were determined with the longitudinal-longitudinal configuration at six energies;Nonsk,Dos″ok andKos″so with the sideway-longitudinal configuration at six energies. Part of the data was obtained with an unpolarized CH2 target where only the two spin-index polarization transfer parametersKos″ko andKos″so were determined. Data are compared with phase shift analyses predictions and with the LAMPF results at 0.788 GeV. Present results are the first measurements of rescattering observables above 0.80 GeV. They provide an important contribution to any future theoretical or phenomenological analysis.

20 data tables

No description provided.

No description provided.

No description provided.

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Measurements of the total cross-section difference Delta sigma-T in n p transmission between 0.86-GeV and 0.94-GeV

Ball, J. ; Chesny, P. ; Combet, M. ; et al.
Z.Phys.C 61 (1994) 53-58, 1994.
Inspire Record 353895 DOI 10.17182/hepdata.14263

We present results of the total cross section differenceΔσТ obtained in transmission measurements at the energies 0.86, 0.88, 0.91 and 0.94 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was transmitted through the polarized Saclay frozen-spin proton target. The beam and target polarizations were oriented in the vertical direction. The present results agree with previous SATURNE measurements and improve the amplitude analysis in the forward direction.

2 data tables

No description provided.

Average of this result and data from Fontaine et al. 1991, Nucl.Phys. B358, 297 (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+2233> RED = 2233 </a>).


Angular dependence of the beam and target analyzing powers a(oono) and A(ooon) in n p elastic scattering between 0.477-GeV and 0.940-GeV

Ball, J. ; Chesny, P. ; Combet, M. ; et al.
Nucl.Phys.A 559 (1993) 477-488, 1993.
Inspire Record 33734 DOI 10.17182/hepdata.36610

We present a total of 273 independent data points of the analyzing powers A oono (nP) and A ooon (nP) in a large angular interval at four energies between 0.477 and 0.940 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the polarized Saclay frozen-spin proton target. Part of the data was obtained with a CH 2 target. A comparison of the two measured observables allows one to determine the polarization of the neutron beam. The present results provide an important contribution to any future theoretical or phenomenological analysis.

8 data tables

No description provided.

No description provided.

Data from 97.7 to 123.4 degrees are combined beam and target analyzing powers.

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