Search

Your search keyword '"U. Henjes"' showing total 7 results
Start Over Author "U. Henjes"
7 results on '"U. Henjes"'

1. Angular distributions of light projectile fragments in deep inelastic Pb + Em interactions at 160 A GeV

Author

M. Gheata, S. Vokal, K. Soderstrem, Joakim Nystrand, I. Otterlund, V. Bradnova, M. Karabova, Bo Jakobsson, V. Vashisht, I. Manhas, S. Dhamija, J. Grote, T. Svensson, Evert Anders Stenlund, M. Tothova, D. Skelding, Rashmi Raniwala, B. Singh, D. Felea, S. Lokanathan, R. Sethi, A. Gheata, Anju Bhasin, N. Saidkhanov, and U. Henjes

Subjects
Physics, Nuclear and High Energy Physics, Projectile, Plane (geometry), Nuclear Theory, Hadron, Momentum, Nuclear physics, Nuclear fusion, Nuclear emulsion, Atomic physics, Nuclear Experiment, Nucleon, Ground state
Abstract

The nuclear emulsion was exposed at CERN by the lead projectile at 160 A GeV. The angles between any pair of fragments with Z =2 i 4 have been measured in the emulsion plane for the events which did not contain heavy fragments. The constant characterizing the normal angle (') distribution of the fragment momentum projection onto the emulsion plane with respect to initial projectile momentum p0 is found to be ae' =( 0:37§ 0:02) mrad. Corresponding value ae0 = (121§ 6) MeV/c of nucleon momentum distribution in the lead nucleus coincides with that expected from Fermi momentum distribution for this nucleus. The peak in the pair-angle distribution of double-charged fragments, 8 Be! 2fi, is presented for the region of small angles (< 0:1 mrad). The fraction of fi-particles coming from the decay of the ground state 8 Be is found to be (13§ 2)% of their whole number.

Published
1999
Full Text
View/download PDF

2. Fragmentation and multifragmentation of 10.6A GeV gold nuclei

Author

M.I. Adamovich, M.M. Aggarwal, Y.A. Alexandrov, R. Amirikas, N.P. Andreeva, S.K. Badyal, A.M. Bakich, E.S. Basova, K.B. Bhalla, A. Bhasin, V.S. Bhatia, V. Bradnova, V.I. Bubnov, X. Cai, I.Y. Chasnikov, G.M. Chen, L.P. Chernova, M.M. Chernyavsky, S. Dhamija, K. El Chenawi, D. Felea, S.Q. Feng, L.N. Filippova, A.S. Gaitinov, E.R. Ganssauge, S. Garpman, S.G. Gerassimov, A. Gheata, M. Gheata, J. Grote, K.G. Gulamov, S.K. Gupta, V.K. Gupta, M. Haiduc, D. Hasegan, U. Henjes, B. Jakobsson, L. Just, E.K. Kanygina, S.P. Kharlamov, A.D. Kovalenko, S.A. Krasnov, V. Kumar, V.G. Larionova, I.A. Lebedev, Y.X. Li, L.S. Liu, Z.G. Liu, J.J. Lord, N.S. Lukicheva, Y. Lu, S.B. Luo, L.K. Mangotra, I. Manhas, I.S. Mittra, A.K. Musaeva, S.Z. Nasyrov, V.S. Navotny, J. Nystrand, G.I. Orlova, I. Otterlund, L.S. Peak, N.G. Peresadko, N.V. Petrov, V.A. Plyushchev, W.Y. Qian, Y.M. Qin, R. Raniwala, N.K. Rao, J.T. Rhee, M. Roeper, V.V. Rusakova, N. Saidkhanov, N.A. Salmanova, A.M. Seitimbetov, R. Sethi, B. Singh, D. Skelding, V.I. Skorobogatova, K. Söderström, E. Stenlund, L.N. Svechnikova, T. Svensson, A.M. Tawfik, V. Topor Pop, M.I. Tretyakova, T.P. Trofimova, U.I. Tuleeva, B.P. Tursunov, Vani Vashisht, S. Vokal, J. Vrlakova, H.Q. Wang, S.H. Wang, X.R. Wang, J.G. Wang, Z.Q. Weng, R.J. Wilkes, C.B. Yang, Z.B. Yin, L.Z. Yu, I.S. Zgura, D.H. Zhang, P.Y. Zheng, S.I. Zhokhova, and D.C. Zhou

Subjects
Physics, Nuclear and High Energy Physics, Phase transition, Projectile, Nuclear Theory, Hadron, chemistry.chemical_element, Observable, Nuclear physics, chemistry, Critical point (thermodynamics), Nuclear fusion, Atomic physics, Nuclear Experiment, Critical exponent, Helium
Abstract

The experimental data on the interactions of 10.6A GeV gold nuclei in nuclear emulsions are analyzed with particular emphasis of target separation interactions and study of critical exponents. Charged fragment moments, conditional moments as well as two and three – body asymmetries of the fast moving projectile particles are determined in terms of the total charge remaining bound in the multiply charged projectile fragments. Some differences in the average yields of helium nuclei and heavier fragments are observed, which may be attributed to a target effect. However, two and three-body asymmetries and conditional moments indicate that the breakup mechanism of the projectile seems to be independent of target mass. We looked for evidence of critical point observable in finite nuclei by study the resulting charged fragments distributions. We have obtained the values for the critical exponents γ, β and τ and compare our results with those at lower energy experiment (1.0A GeV data). The values suggest that a phase transition like behavior, is observed.

Published
1999
Full Text
View/download PDF

3. Critical behaviour in Au fragmentation at 10.7A GeV

Author

K. Söderström, P. Y. Zheng, L. K. Mangotra, K. G. Gulamov, R. Sethi, V. I. Bubnov, V. A. Plyushchev, S. Vokal, V. Kumar, Y.X. Li, Madan M. Aggarwal, V. S. Navotny, G.M. Chen, Joakim Nystrand, L. N. Svechnikova, L. P. Chernova, A.K. Musaeva, N. A. Salmanova, V. S. Bhatia, Anju Bhasin, N. Saidkhanov, C.I. Shakhova, L. S. Liu, V. G. Larionova, D. Skelding, J. T. Rhee, M. Tothova, E. R. Ganssauge, V. V. Rusakova, I. Y. Chasnikov, L. G. Sarkisova, C.B. Yang, Z. Q. Weng, Y. A. Alexandrov, Bo Jakobsson, Rashmi Raniwala, L. Karlsson, L.S. Peak, R. J. Wilkes, J. J. Lord, S.A. Krasnov, I. Manhas, V. R. Sarkisyan, J. Grote, N.A. Tawfik, Dong-Hai Zhang, M. I. Tretyakova, S.Z. Nasyrov, N. G. Peresadko, E. S. Basova, A.M. Seitimbetov, N. K. Rao, Janka Vrlakova, D. C. Zhou, A. S. Gaitinov, X. Cai, U.I. Tuleeva, F. A. Avetyan, A. M. Bakich, M. Roeper, Maria Haiduc, M. Karabova, M. M. Chernyavski, L. Just, H. Q. Wang, E. K. Kanygina, S. Garpman, M. I. Adamovich, X.R. Wang, W. Y. Qian, S. K. Badyal, Z.G. Liu, S. I. Zhokhova, Alexander Kovalenko, B. Singh, N. P. Andreeva, S. B. Luo, S. P. Kharlamov, T. P. Trofimova, Shi-kun Wang, V. G. Bogdanov, U. Henjes, S. G. Gerassimov, Y.M. Qin, N. S. Lukicheva, G. I. Orlova, Vivek K. Gupta, Shiv K. Gupta, K. B. Bhalla, S. Dhamija, R. Amirikas, Evert Anders Stenlund, N. A. Marutyan, S. Lokanathan, Y. Lu, V. Bradnova, and I. Otterlund

Subjects
Physics, Nuclear and High Energy Physics, Phase transition, education.field_of_study, Hadron, Population, Charge density, Supercritical fluid, Nuclear physics, Fragmentation (mass spectrometry), Nuclear fusion, Nuclear emulsion, Nuclear Experiment, education
Abstract

The complete charge distribution of products from Au nuclei fragmenting in nuclear emulsion at 10.7A GeV has been measured. Multiplicities of produced particles and particles associated with the target source are used to select peripheral and central events. A statistical analysis, based on event-by-event charge distributions, show that a population of subcritical, critical and supercritical events, i.e. a phase transition like behaviour, is observed among peripheral collisions.

Published
1998
Full Text
View/download PDF

4. Multifragmentation of Gold nuclei in the interactions with photoemulsion nuclei at 10.7 GeV/nucleon

Author

L. N. Svechnikova, M. Karabova, H. Q. Wang, W. Y. Qian, A.M. Tawfik, Madan M. Aggarwal, L.Z. Yu, V. S. Navotny, K. El Chenawi, Rashmi Raniwala, R. Sethi, L.S. Peak, K. G. Gulamov, V. Kumar, M. I. Tretyakova, M. Gheata, K. Söderström, S.Z. Nasyrov, L. K. Mangotra, Y.X. Li, E. Baklitskaya, A. Gheata, N. G. Peresadko, E. S. Basova, G. Z. Eligbaeva, X. Cai, D. C. Zhou, L. Just, S.Q. Feng, Anju Bhasin, N. Saidkhanov, A. M. Bakich, Bhartendu K. Singh, T. I. Shakhova, M. Roeper, I.Ya. Chasnikov, M. I. Adamovich, G.M. Chen, D. Felea, Joakim Nystrand, S. Dhamija, Dong-Hai Zhang, Z. Q. Weng, N. A. Salmanova, V.R. Sarkisian, D. Skelding, Yu.A. Aleksandrov, M. M. Chernyavsky, Shi-kun Wang, X.R. Wang, J. T. Rhee, M. Haiduc, V. A. Plyushchev, S. Vokal, S. P. Kharlamov, V. G. Bogdanov, U. Henjes, Z.V. Anzon, V.V. Uzhinsky, N. P. Andreeva, Y.M. Qin, K. B. Bhalla, V. S. Bhatia, L. S. Liu, V. G. Larionova, U.I. Tuleeva, R. Amirikas, E. R. Ganssauge, N. S. Lukicheva, N.A. Marutian, T. Svensson, N. V. Maslennikova, S. I. Zhokhova, A.M. Seitimbetov, N. K. Rao, V. Vashisht, S. K. Gupta, Y. Lu, A.Y. Mashkov, E. K. Kanygina, L. E. Eremenko, L. G. Sarkisova, F.A. Avetian, B.P. Tursunov, G. S. Kalyachkina, E. Stenlund, G. I. Orlova, Bo Jakobsson, I. Manhas, I. Otterlund, Alexander Kovalenko, M. Tothova, S.G. Gerasimov, N. V. Petrov, S. Garpman, T. P. Trofimova, Vivek K. Gupta, A. S. Gaitinov, V. I. Bubnov, Janka Vrlakova, A.K. Musaeva, D. Hasegan, V. V. Rusakova, Z.B. Yin, R. J. Wilkes, P. Y. Zheng, I. S. Mittra, S. Lokanathan, J. J. Lord, S. B. Luo, J. Grote, C.B. Yang, S. A. Krasnov, L. P. Chernova, V. Bradnova, S. K. Badyal, and Z.G. Liu

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Charge density, Statistical model, Nuclear physics, Transverse momentum, Radial flow, Multiplicity (chemistry), Nuclear Experiment, Nucleon, Glauber, Excitation
Abstract

Recent results from the EMU-01/12 collaboration are presented for 10.7 GeV/nucleon gold nuclei interactions in emulsion. The distributions of "bound" charge ( Zbound ,Z b3), multiplicity distributions, fragment correlations and fluctua- tions are discussed. The data are compared to similar results obtained on the ALADIN setup at 600 MeV/nucleon. It is shown that multifragmentation of gold nuclei at high and in- termediate energies has common features. It is also obtained that the IMFs have reduced multiplicity at high energies. The data are analyzed within the scope of the statistical model of multifragmentation. This model requires the fol- lowing predetermined model ingredients: mass, charge and excitation energy of nuclear residuals. The simple estimation method of these characteristics is proposed in the framework of the Glauber approach. It is shown that the multifragmentation model reproduces qualitatively the present data. A dramatic discrepancy between the predicted and experimental yield of two charged fragments is found. The evolution of transverse momentum of fragments as a function of Zbound is presented. It is shown that the model greatly underpredicts the transverse momentum of fragments. It is interpreted as evidence of a strong radial flow of spectator fragments.

Published
1997
Full Text
View/download PDF

5. Nucleus-nucleus collision as superposition of nucleon-nucleus collisions

Author

Madan M. Aggarwal, D. Felea, S. B. Luo, I. Manhas, S. P. Kharlamov, V. S. Navotny, E. K. Kanygina, U. Henjes, A.M. Tawfik, M.M. Chernyaysky, Y.M. Qin, K. El Chenawi, S. Dhamija, K. G. Gulamov, I. S. Mittra, R. Sethi, G.M. Chen, V. Kumar, L. P. Chernova, J. J. Lord, Y.X. Li, Janka Vrlakova, M. Gheata, J. Grote, Anju Bhasin, R. J. Wilkes, N. Saidkhanov, M. Roeper, D. Skelding, A.K. Musaeva, D. C. Zhou, S. K. Gupta, K. B. Bhalla, M. Karabova, A. Gheata, C.B. Yang, S.A. Krasnov, Bo Jakobsson, Z. Q. Weng, I. Y. Chasnikov, L. N. Svechnikova, W. Y. Qian, S. I. Zhokhova, L.Z. Yu, N. G. Peresadko, E. S. Basova, Y. A. Alexandrov, Vivek K. Gupta, Joakim Nystrand, H.Q. Wang, M. I. Tretyakova, S.Z. Nasyrov, L. K. Mangotra, V. Vashisht, Y. Lu, X. Cai, N. S. Lukicheva, A. S. Gaitinov, K. Soderstrem, T. Svensson, S. Garpman, Alexander Kovalenko, E. Stenlund, X.R. Wang, E. R. Ganssauge, S. Lokanathan, T. P. Trofimova, G. I. Orlova, S. K. Badyal, Dong-Hai Zhang, M. I. Adamovich, N. P. Andreeva, S. G. Gerassimov, V. Bradnova, V. I. Bubnov, V. V. Rusakova, Z.B. Yin, S.Q. Feng, I. Otterlund, S. Vokal, V. S. Bhatia, L. S. Liu, V. G. Larionova, U.I. Tuleeva, Rashmi Raniwala, B. Singh, N. A. Salmanova, A.M. Seitimbetov, N. K. Rao, P. Y. Zheng, and M. Tothova

Subjects
Physics, Nuclear and High Energy Physics, Projectile, Nuclear Theory, Atomic and Molecular Physics, and Optics, Charged particle, Nuclear physics, Momentum, Superposition principle, medicine.anatomical_structure, Angular momentum coupling, medicine, Impact parameter, Atomic physics, Nuclear Experiment, Nucleon, Nucleus
Abstract

Angular distributions of charged particles produced in 16O and 32S collisions with nuclear track emulsion were studied at momenta 4.5 and 200 A GeV/c. Comparison with the angular distributions of charged particles produced in proton-nucleus collisions at the same momentum allows to draw the conclusion, that the angular distributions in nucleus-nucleus collisions can be seen as superposition of the angular distributions in nucleon-nucleus collisions taken at the same impact parameter bNA, that is mean impact parameter between the participating projectile nucleons and the center of the target nucleus

6. Bounce-off in (197)Au induced collisions with Ag(Br) nuclei at 11.6 A GeV/c

Author

E. Stenlund, L. N. Svechnikova, L. P. Chernova, N. A. Salmanova, D. Skelding, V. I. Bubnov, M. Karabova, E. K. Kanygina, J. T. Rhee, Madan M. Aggarwal, W. Y. Qian, V. S. Navotny, R. Sethi, K. El Chenawi, L. E. Eremenko, Y.X. Li, L.Z. Yu, L. G. Sarkisova, V. V. Rusakova, Z.B. Yin, I. Y. Chasnikov, I. Otterlund, D. Hasegan, Y. A. Alexandrov, Bo Jakobsson, K. Söderström, V. R. Sarkisyan, Mihaela Gheata, I. S. Mittra, S. B. Luo, C.I. Shakhova, Joakim Nystrand, A.M. Tawfik, L.S. Peak, S.Q. Feng, Anju Bhasin, J. J. Lord, S. K. Badyal, Z.G. Liu, R. J. Wilkes, N. Saidkhanov, Dong-Hai Zhang, C.G. Lee, B. Singh, J. Grote, B.P. Tursunov, N. G. Peresadko, S.Z. Nasyrov, L. K. Mangotra, K. G. Gulamov, N. V. Petrov, V. Kumar, G. S. Kalyachkina, G. Z. Eligbaeva, V. A. Plyushchev, S. Vokal, L. Just, F. A. Avetyan, S. Dhamija, U.I. Tuleeva, H.S. Wang, S. Garpman, Y.A. Mashkov, X.R. Wang, V. S. Bhatia, L. S. Liu, V. G. Larionova, V. Vashisht, Maria Haiduc, A. Pavukova, N. P. Andreeva, S. G. Gerassimov, Alexander Kovalenko, A. S. Gaitinov, E. Basova, G.M. Chen, T. P. Trofimova, Z. Q. Weng, Y. Lu, S. P. Kharlamov, V. G. Bogdanov, U. Henjes, Z.V. Anzon, Y.M. Qin, M. I. Tretyakova, X. Cai, I.C. Kim, M. M. Chernyavsky, N. A. Marutyan, M. Roeper, N. V. Maslennikova, S. I. Zhokhova, P. Y. Zheng, Rashmi Raniwala, H.Q. Wang, A.M. Seitimbetov, N. S. Lukicheva, N. K. Rao, S. Lokanatan, A.K. Musaeva, C.B. Yang, D. Felea, S.A. Krasnov, M. I. Adamovich, I. Manhas, K. B. Bhalla, R. Amirikas, Janka Vrlakova, D. C. Zhou, Andrei Gheata, A. M. Bakich, E. R. Ganssauge, V. Bradnova, G. I. Orlova, Vivek K. Gupta, and Shiv K. Gupta

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Angular distribution, Physics::Instrumentation and Detectors, Projectile, Angular correlation, Nuclear Theory, Hadron, Nuclear fusion, Particle flow, Atomic physics, Nuclear Experiment
Abstract

Using emulsion detectors a transverse-momentum analysis of projectile fragments has been performed in Au induced nuclear interactions at 11.6 A GeV/c. Evidence for collective flow of the projectile fragments has been obtained. Angular distributions of the principal vectors of projectile and target fragments have shown strong azimuthal correlation.

7. He production in 158 A GeV/c Pb on Pb interactions

Author

N. V. Petrov, S. Garpman, S. Lokanathan, U.I. Tuleeva, S.Z. Nasyrov, G. S. Kalyachkina, Y. Lu, M. I. Tretyakova, V. A. Plyushchev, S. Vokal, X. Cai, K. Söderström, L. P. Chernova, Alexander Kovalenko, E. Stenlund, V. S. Bhatia, B.P. Tursunov, L. N. Svechnikova, L. Just, L. S. Liu, V. G. Larionova, T. P. Trofimova, M. I. Adamovich, A. Pavukova, Joakim Nystrand, Dong-Hai Zhang, V. Vashist, M. Roeper, C.G. Lee, Mihaela Gheata, L. G. Sarkisova, E. K. Kanygina, I. Y. Chasnikov, K. G. Gulamov, V. Kumar, N. A. Salmanova, D. Skelding, S. P. Kharlamov, V. I. Bubnov, V. G. Bogdanov, U. Henjes, L.S. Peak, D. Hasegan, J. T. Rhee, M. M. Chernyavski, Y. A. Alexandrov, D. Felea, G. Z. Eligbaeva, N. V. Maslennikova, Z.V. Anzon, Y.M. Qin, N. A. Marutyan, Rashmi Raniwala, Y. C. Kim, V. V. Rusakova, N. G. Peresadko, E. S. Basova, Z.B. Yin, Shi-kun Wang, N. S. Lukicheva, S. W. Feng, G.M. Chen, A. S. Gaitinov, R. J. Wilkes, B. Singh, L. K. Mangotra, Anju Bhasin, S. I. Zhokhova, N. Saidkhanov, S. B. Luo, I. S. Mittra, S. K. Badyal, A.M. Tawfik, Z.G. Liu, X.R. Wang, A.M. Seitimbetov, N. P. Andreeva, C.I. Shakhova, I. Manhas, S. G. Gerassimov, N. K. Rao, Z. Q. Weng, K. B. Bhalla, R. Amirikas, G. I. Orlova, L. E. Eremenko, Bo Jakobsson, D. C. Zhou, V. Bradnova, M. Tothova, V. R. Sarkisyan, R. Sethi, Andrei Gheata, A. M. Bakich, F. A. Avetyan, P. Y. Zheng, Y.X. Li, Vivek K. Gupta, Maria Haiduc, Shiv K. Gupta, E. R. Ganssauge, Madan M. Aggarwal, V. S. Navotny, K. El Chenawi, Janka Vrlakova, I. Otterlund, A.K. Musaeva, C.B. Yang, J. J. Lord, S.A. Krasnov, J. Grote, M. Karabova, H. Q. Wang, W. Y. Qian, L.Z. Yu, T. Svensson, and S. Dhamija

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Fragmentation (mass spectrometry), Total angular momentum quantum number, Transverse momentum, Angular momentum coupling, Rotational transition, Atomic physics, Nuclear Experiment, Scaling, Spectral line, Fermi Gamma-ray Space Telescope
Abstract

Angular distributions of projectile-associated He fragments from Pb induced reactions on stationary Pb target at 158 A GeV/c incident momentum are reported. The precision of the angular measurements was about ±0.01 mrad. Two emission components are appearing in the projected angular spectra of the He particles, one representing fragmentation at Fermi momentum scale, while the other one exhibits large transverse momentum transfer. By scaling with the incident momentum the angular spectra of He particles are compared with earlier reported measurements of Au on Au interactions at 11.6 A GeV/c. The p T spectrum of the He particles appears the same for the two cases.

Catalog

Books, media, physical & digital resources
See catalog results