排序方式: 共有48条查询结果,搜索用时 8 毫秒
31.
E. Stephan St. Kistryn N. Kalantar-Nayestanaki A. Biegun K. Bodek I. Ciepa? A. Deltuva M. Eslami-Kalantari A. C. Fonseca I. Gaspari? J. Golak B. Jamr��z L. Joulaeizadeh H. Kamada M. Ki? B. K?os A. Kozela M. Mahjour-Shafiei H. Mardanpour J. Messchendorp A. Micherdzi��ska H. Moeini A. Nogga A. Ramazani-Moghaddam-Arani R. Skibi��ski R. Sworst H. Wita?a J. Zejma 《Few-Body Systems》2011,50(1-4):283-285
High precision data for vector and tensor analyzing powers of the ${^1{\rm {H}}(\vec{\rm{d}},\rm{{pp}})\rm{n}}$ breakup reaction at 130 and 100?MeV deuteron beam energies have been measured in a large fraction of the phase space. They are compared to the theoretical predictions based on various approaches to describe the three nucleon (3N) system dynamics. Theoretical predictions describe very well the vector analyzing power data, with no need to include any three-nucleon force effects for these observables. Tensor analyzing powers can be also very well reproduced by calculations in most of the studied region, but locally certain discrepancies are observed. At 130?MeV for A xy such discrepancies usually appear, or are enhanced, when model 3N forces are included. Predicted effects of 3NFs are much lower at 100?MeV and at this energy equally good consistency between the data and the calculations is obtained with or without 3NFs. 相似文献
32.
G. Khatri I. Ciepał K. Bodek N. Kalantar-Nayestanaki St. Kistryn B. Kłos A. Kozela A. Magiera I. Mazumdar J. Messchendorp W. Parol I. Skwira-Chalot E. Stephan D. Rozpędzik A. Wrońska J. Zejma 《Few-Body Systems》2014,55(8-10):1035-1036
An experiment, with the deuteron beams at energy of 160 MeV impinging on the liquid deuterium target, was carried out using the BINA detector at KVI, in Groningen, the Netherlands. Data were collected for the purpose of obtaining high precision differential cross-sections for the deuteron break-up reaction. The elastic scattering channel was also measured alongside for the purpose of cross-section normalization. 相似文献
33.
I. Ciepał B. Kłos St. Kistryn E. Stephan A. Biegun K. Bodek A. Deltuva E. Epelbaum M. Eslami-Kalantari A. C. Fonseca J. Golak V. Jha N. Kalantar-Nayestanaki H. Kamada G. Khatri Da. Kirillov Di. Kirillov St. Kliczewski A. Kozela M. Kravcikova H. Machner A. Magiera G. Martinska J. Messchendorp A. Nogga W. Parol A. Ramazani-Moghaddam-Arani B. J. Roy H. Sakai K. Sekiguchi I. Sitnik R. Siudak R. Skibiński R. Sworst J. Urban H. Witała A. Wrońska J. Zejma 《Few-Body Systems》2013,54(7-10):1301-1305
Precise and large set of cross sections, vector A x , A y and tensor A xx , A xy , A yy analyzing powers for the 1 H(d, pp)n breakup reactions were measured at 100 and 130 MeV deuteron beam energies with the use of the SALAD and BINA detectors at KVI and Germanium Wall setup at FZ-Jülich. Results are compared with various theoretical approaches which model the three-nucleon (3N) system dynamics. The calculations are based on different two-nucleon (2N) potentials which can be combined with models of the three-nucleon force (3NF) and other pieces of the dynamics can also be included like the Coulomb interaction and relativistic effects. The cross sections data reveal seizable 3NF and Coulomb force influence. In case of analyzing powers very low sensitivity to the effects was found and the data are well describe by 2N models only. At 130 MeV for A xy serious disagreements appear when 3NF models are included into calculations. 相似文献
34.
Trnka D Anton G Bacelar JC Bartholomy O Bayadilov D Beloglazov YA Bogendörfer R Castelijns R Crede V Dutz H Ehmanns A Elsner D Ewald R Fabry I Fuchs M Essig K Funke Ch Gothe R Gregor R Gridnev AB Gutz E Höffgen S Hoffmeister P Horn I Hössl J Jaegle I Junkersfeld J Kalinowsky H Klein F Klein F Klempt E Konrad M Kopf B Kotulla M Krusche B Langheinrich J Löhner H Lopatin IV Lotz J Lugert S Menze D Messchendorp JG Mertens T Metag V Morales C Nanova M Novotny R Ostrick M Pant LM van Pee H Pfeiffer M 《Physical review letters》2005,94(19):192303
The photoproduction of omega mesons on nuclei has been investigated using the Crystal Barrel/TAPS experiment at the ELSA tagged photon facility in Bonn. The aim is to study possible in-medium modifications of the omega meson via the reaction gamma + A --> omega + X --> pi(0)gamma + X('). Results obtained for Nb are compared to a reference measurement on a LH2 target. While for recoiling, long-lived mesons (pi(0), eta, and eta;(')), which decay outside of the nucleus, a difference in the line shape for the two data samples is not observed, we find a significant enhancement towards lower masses for omega mesons produced on the Nb target. For momenta less than 500 MeV/c an in-medium omega meson mass of M(medium) = [722(+4)(-4)(stat)+35-5(syst)] MeV/c(2) has been deduced at an estimated average nuclear density of 0.6rho(0). 相似文献
35.
Credé V Bartholomy O Anisovich AV Anton G Bantes R Beloglazov Y Bogendörfer R Castelijns R Ehmanns A Ernst J Fabry I Flemming H Fösel A Freiesleben H Fuchs M Funke Ch Gothe R Gridnev A Gutz E Höffgen SK Horn I Hössl J Joosten R Junkersfeld J Kalinowsky H Klein F Klempt E Koch H Konrad M Kopf B Krusche B Langheinrich J Löhner H Lopatin I Lotz J Matthäy H Menze D Messchendorp J Morales C Novinski D Ostrick M van Pee H Radkov A Reinnarth J Sarantsev AV Schadmand S Schmidt Ch Schmieden H Schoch B 《Physical review letters》2005,94(1):012004
Total and differential cross sections for the reaction p(gamma,eta)p have been measured for photon energies in the range from 750 MeV to 3 GeV. The low-energy data are dominated by the S11 wave which has two poles in the energy region below 2 GeV. Eleven nucleon resonances are observed in their decay into peta. At medium energies we find evidence for a new resonance N(2070)D15 with (M,Gamma)=(2068+/-22, 295+/-40) MeV. At gamma energies above 1.5 GeV, a strong peak in the forward direction develops, signaling the exchange of vector mesons in the t channel. 相似文献
36.
J. Junkersfeld A. V. Anisovich G. Anton R. Bantes O. Bartholomy R. Beck Yu. Beloglazov R. Bogendörfer R. Castelijns V. Crede A. Ehmanns J. Ernst I. Fabry H. Flemming A. Fösel M. Fuchs Ch. Funke R. Gothe A. Gridnev E. Gutz St. Höffgen I. Horn J. Hößl H. Kalinowsky F. Klein E. Klempt H. Koch M. Konrad B. Kopf B. Krusche J. Langheinrich H. Löhner I. Lopatin J. Lotz H. Matthäy D. Menze J. Messchendorp V. A. Nikonov D. Novinski M. Ostrick H. van Pee A. Radkov A. V. Sarantsev S. Schadmand C. Schmidt H. Schmieden B. Schoch G. Suft V. Sumachev T. Szczepanek U. Thoma D. Walther Ch. Weinheimer 《The European Physical Journal A - Hadrons and Nuclei》2007,31(3):365-372
Differential and total cross-sections for photoproduction of γp→pπ
0
ω and γp→Δ
+
ω were determined from measurements of the CB-ELSA experiment, performed at the electron accelerator ELSA in Bonn. The measurements
covered the photon energy range from the production threshold up to 3GeV. 相似文献
37.
38.
Jaegle I Mertens T Anisovich AV Bacelar JC Bantes B Bartholomy O Bayadilov D Beck R Beloglazov YA Castelijns R Crede V Dutz H Ehmanns A Elsner D Essig K Ewald R Fabry I Fuchs M Funke Ch Gothe R Gregor R Gridnev AB Gutz E Höffgen S Hoffmeister P Horn I Junkersfeld J Kalinowsky H Kammer S Kleber V Klein F Klein F Klempt E Konrad M Kotulla M Krusche B Lang M Langheinrich J Löhner H Lopatin IV Lotz J Lugert S Menze D Messchendorp JG Metag V Morales C Nanova M Nikonov VA Novinski D Novotny R 《Physical review letters》2008,100(25):252002
Quasifree photoproduction of eta mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn ELSA accelerator. The eta mesons have been detected in coincidence with recoil protons and recoil neutrons, which allows a detailed comparison of the quasifree n(gamma,eta)n and p(gamma,eta)p reactions. The excitation function for eta production off the neutron shows a pronounced bumplike structure at W=1.68 GeV (E{gamma} approximately 1 GeV), which is absent for the proton. 相似文献
39.
The strange meson production on a proton target in theK
0Σ+ channel is sensitive to nucleon resonance contributions. TheK
0 production on a deuteron target can provide information on the hyperon-nucleon final-state interaction. The experiments γp →K
0Σ+ andγd →
K
0Σ+n have been carried out at the ELSA facility at Bonn. In this paper, we report the preliminary results of both experiments 相似文献
40.