| 000 | 02629nlm1a2200373 4500 | ||
|---|---|---|---|
| 001 | 660082 | ||
| 005 | 20231030041652.0 | ||
| 035 | _a(RuTPU)RU\TPU\network\29016 | ||
| 090 | _a660082 | ||
| 100 | _a20190423a2018 k y0engy50 ba | ||
| 101 | 0 | _aeng | |
| 135 | _aarnn ---uucaa | ||
| 181 | 0 | _ai | |
| 182 | 0 | _ab | |
| 200 | 1 |
_aFirst measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons _fA. Kaser [et al.] |
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| 203 |
_aText _celectronic |
||
| 300 | _aTitle screen | ||
| 320 | _a[References.: 52 tit.] | ||
| 330 | _aThe helicity-dependent cross sections for the photoproduction of pairs have been measured for the first time. The experiment was performed at the tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball – TAPS calorimeter. The experiment used a polarized deuterated butanol target and a circularly polarized photon beam. This arrangement allowed the (photon and target spin antiparallel) and (parallel spins) components to be measured for quasi-free production of pairs off protons and neutrons. The main finding is that the two helicity components contribute identically, within uncertainties, for both participant protons and neutrons. The absolute couplings for protons and neutrons are also identical. This means that nucleon resonances contributing to this reaction in the investigated energy range have almost equal electromagnetic helicity couplings, and . Identical couplings for protons and neutrons are typical for resonances and identical and components are only possible for states, which constrains possible contributions of nucleon resonances. | ||
| 461 | _tPhysics Letters B | ||
| 463 |
_tVol. 786 _v[P. 305-312] _d2018 |
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| 610 | 1 | _aэлектронный ресурс | |
| 610 | 1 | _aтруды учёных ТПУ | |
| 610 | 1 | _aфотоны | |
| 610 | 1 | _aпротоны | |
| 610 | 1 | _aнейтроны | |
| 701 | 1 |
_aKaser _bA. |
|
| 701 | 1 |
_aDieterle _bM. |
|
| 701 | 1 |
_aWitthauer _bL. |
|
| 701 | 1 |
_aFiks (Fix) _bA. I. _cmathematician _cProfessor of Tomsk Polytechnic University, doctor of physico-mathematical Sciences _f1968- _gAlexander Ivanovich _2stltpush _3(RuTPU)RU\TPU\pers\33830 |
|
| 712 | 0 | 2 |
_aНациональный исследовательский Томский политехнический университет _bИсследовательская школа физики высокоэнергетических процессов _c(2017- ) _h8118 _2stltpush _3(RuTPU)RU\TPU\col\23551 |
| 801 | 2 |
_aRU _b63413507 _c20190423 _gRCR |
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| 856 | 4 | _uhttps://doi.org/10.1016/j.physletb.2018.10.006 | |
| 942 | _cCF | ||