Measurement of the neutron-proton polarization transfer coefficient K′ at 17.4 MeV

Ockenfels, M.; Köble, T.; Schwindt, M.; Weltz, J.; Witsch, W. von

doi:10.1016/0375-9474(91)90497-t

Cited by 17 publications

(10 citation statements)

References 8 publications

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“…From this result one can conclude that the presented values do not support the hypothesis of local minimum of ǫ 1 around 15 MeV, representing a much weaker tensor force than that predicted (as indicated in [16,19,20]). …”

Section: Resultscontrasting

confidence: 69%

“…The A yy (ϑ) measurement at 90 o c.m. is presented by Schöberl et al [16] [18,19] (Bonn), while ∆σ T was only recently measured in TUNL in the 3.65-11.60 MeV energy range [20,21]. In all these works the authors performed at least basic phase shift analyses to determine the value of ǫ 1 , in order to compare the experimental results from different experiments.…”

Section: The Mixing Parameter ǫmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of spin-dependent total cross-section difference $\Delta\sigma_T$ in neutron-proton scattering at 16 MeV

Brož¹,

Černý²,

Doležal³

et al. 1996

Zeitschrift f�r Physik A Hadrons and Nuclei

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A new measurement of ∆σ T for polarized neutrons transmitted through a polarized proton target at 16.2 MeV has been made. A polarized neutron beam was obtained from the 3 H(d, n) 4 He reaction; proton polarization over 90% was achieved in a frozen spin target of 20 cm 3 volume. The measurement yielded the value ∆σ T = (−126 ± 21 ± 14) mb. The result of a simple phase shift analysis for the 3 S 1 − 3 D 1 mixing parameter ǫ 1 is presented and compared with the theoretical potential model predictions.

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Section: Resultscontrasting

confidence: 69%

Section: The Mixing Parameter ǫmentioning

confidence: 99%

Measurement of spin-dependent total cross-section difference $\Delta\sigma_T$ in neutron-proton scattering at 16 MeV

Brož¹,

Černý²,

Doležal³

et al. 1996

Zeitschrift f�r Physik A Hadrons and Nuclei

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show abstract

“…If there are significant differences (as judged by the error bar resulting from the single-energy analyses) then one must assume that the multienergy analysis used to reject data was not general enough and introduced a bias. When looking at the comparison of phases resulting from single-and multi-energy analyses, Figure 4: S-D mixing parameter ǫ 1 resulting from single energy phase-shift analyses (data points, [53,54,55,56]), the multi-energy fit used to cleanse the data set (dashed, [50]), the phases from the CD-Bonn potential (dotdash [49]) and the V 18 potential (dotted, [47]) fit to this set.…”

Section: N-n Potentialsmentioning

confidence: 99%

Elastic electron scattering from light nuclei

Sick

2001

Progress in Particle and Nuclear Physics

107

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The charge and magnetic form factors of light nuclei, mainly for mass number A≤4, provide a sensitive test of our understanding of nuclei. A number of "exact" calculations of the wave functions starting from the nucleon-nucleon interaction are available. The treatment of two-body effects needed in the calculation of the electromagnetic form factors has made significant progress. Many electron scattering experiments have provided an extensive data base from which the various (mainly elastic) form factors can be extracted. This review discusses the data and the determination of the form factors, and compares them to the results of theory.

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“…The A 00nn (ϑ) measurement at 90 deg c.m. is presented by Schöberl [3,4]), while ∆σ T was measured in TUNL in the 3.65-11.60 MeV energy range (1993 [5]) and at 16.2 MeV in our laboratory (1993 [6]). Furthermore, ∆σ L has been measured at 66 MeV incident neutron energy at Villigen (1992 [7]).…”

mentioning

confidence: 99%

“…The polarized neutron beam is produced as a secondary beam via the 3 H(d, n) 4 He reaction. To achieve a monoenergetic collimated neutron beam, the associated particle method is used, i.e.…”

mentioning

confidence: 99%

Measurement of spin-dependent total cross-section difference Δσ L in neutron-proton scattering at 16 MeV

Brož

Černý

Doležal

et al. 1997

Z Phys A - Particles and Fields

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A new measurement of ∆σ L for longitudinally polarized neutrons transmitted through a polarized proton target at 16.2 MeV has been made. This complements our previous measurement of ∆σ T at the same energy and after a phaseshift analysis improves the precision of the previous value of 3 S 1 − 3 D 1 mixing parameter 1 . The measurement yields the value ∆σ L = (−55 ± 20 ± 7) mb. The result of a simple phase shift analysis for 1 is presented and compared with the theoretical potential model predictions and other experiments. 25.40.Dn; 24.70.+s; 13.75.Cs In the last decade a considerable progress has been achieved in studying low energy neutron-proton elastic scattering. Beside other problems attention has been paid to clarify the role of tensor force in NN interaction. This force is characterized by the 3 S 1 − 3 D 1 mixing parameter 1 which cannot be measured directly, so only measurements of spin observables sensitive to it can improve the 1 determination. Such observables are the spin-dependent total cross-section differences ∆σ T and ∆σ L , the spin correlation coefficient A 00nn (ϑ) at 90 deg c.m. angle and the spin transfer parameter K 0nn0 (ϑ). The A 00nn (ϑ) measurement at 90 deg c.m. is presented by Schöberl et al. for 13.7 MeV neutron energy (Erlangen 1988 [1]) and by Doll et al. for 19, 21 and 25 MeV (Karlsruhe 1989 [2]). The spin transfer parameter K 0nn0 (133 deg c.m.) was measured at 25.8 and 17.4 MeV by Ockenfels et al. (Bonn 1990 [3, 4]), while ∆σ T was measured in TUNL in the 3.65-11.60 MeV energy range (1993 [5]) and at 16.2 MeV in our laboratory (1993 [6]). Furthermore, ∆σ L has been measured at 66 MeV incident neutron energy at Villigen (1992 [7]). PACS:Analyses of the results show apparent discrepancies, namely around 15 MeV, where two older measurements from Erlangen and Bonn indicate the existence of a local minimum in contrary to potential model and PSA predictions, while our ∆σ T measurement supports the predicted behaviourof 1 .However, our value 1 = (1.46 ± 1.32) deg had a relatively large error, so we studied how to determine this mixing parameter more precisely to find a more definite answer to the 1 problem.As it became infeasible to improve the 1 precision via measuring ∆σ T , we performed a new measurement with longitudinally polarized beam and target to obtain ∆σ L and furthermore ∆σ T − ∆σ L , which is the quantity sensitive namely to 1 , as shown in [5].The measurement of ∆σ L has been performed using the classical transmission method, i.e. the relative difference in attenuation of a polarized neutron beam passing through a polarized proton target has been measured.The experimental setup was similar to the one used for the ∆σ T measurement described in [6], so only brief description with more stress to the modifications will be presented here.In the present experiment a frozen spin polarized proton target with a dilution refrigerator has been used. Propanediol C 3 H 8 O 2 with a paramagnetic Cr(V) impurity was used as a target material. Typical proton polarization obtained was 9...

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Measurement of the neutron-proton polarization transfer coefficient K′ at 17.4 MeV

Cited by 17 publications

References 8 publications

Measurement of spin-dependent total cross-section difference $\Delta\sigma_T$ in neutron-proton scattering at 16 MeV

Measurement of spin-dependent total cross-section difference $\Delta\sigma_T$ in neutron-proton scattering at 16 MeV

Elastic electron scattering from light nuclei

Measurement of spin-dependent total cross-section difference Δσ L in neutron-proton scattering at 16 MeV

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