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NSR database version of May 24, 2024.

Search: Author = J.Helgesson

Found 34 matches.

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2006GH01      Nucl.Phys. A765, 307 (2006)

R.Ghetti, J.Helgesson, G.Lanzano, E.De Filippo, M.Geraci, S.Aiello, S.Cavallaro, A.Pagano, G.Politi, J.L.Charvet, R.Dayras, E.Pollacco, C.Volant, C.Beck, D.Mahboub, R.Nouicer

Correlation functions of light charged particles from projectile-like fragment source in E/A = 44 and 77 MeV 40Ar + 27Al collisions

NUCLEAR REACTIONS 27Al(40Ar, X), E=44, 77 MeV/nucleon; measured light charged particle and projectile-like fragments energies, two-particle correlation functions; deduced emission time sequence, other reaction mechanism features. ARGOS detector array.

doi: 10.1016/j.nuclphysa.2005.11.019
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2006HE12      Phys.Rev. C 73, 044602 (2006)

J.Helgesson, R.Ghetti, J.Ekman

Implications of two-body fragment decay for the interpretation of emission chronology from velocity-gated correlation functions

NUCLEAR REACTIONS 27Al(40Ar, X), E=44 MeV/nucleon; 124Sn(36Ar, X), E=61 MeV/nucleon; analyzed velocity-gated small-angle correlation functions for light charged particles, contributions from independent emission and two-body decay, implications for emission chronology.

doi: 10.1103/PhysRevC.73.044602
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2006VE05      Eur.Phys.J. A 30, 81 (2006)

G.Verde, A.Chbihi, R.Ghetti, J.Helgesson

Correlations and characterization of emitting sources

doi: 10.1140/epja/i2006-10109-6
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2005GH02      Nucl.Phys. A752, 480c (2005)

R.Ghetti, J.Helgesson

Isospin effects in two-particle correlation functions: A probe for the isospin dependence of the nuclear equation of state

NUCLEAR REACTIONS 112,124Sn(36Ar, X), E=61 MeV/nucleon; measured Ep, En, neutron-proton and proton-proton correlation functions; deduced isospin effects.

doi: 10.1016/j.nuclphysa.2005.02.052
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2005MO15      Phys.Rev.Lett. 94, 202701 (2005)

L.G.Moretto, K.A.Bugaev, J.B.Elliott, R.Ghetti, J.Helgesson, L.Phair

The Complement: A Solution to Liquid Drop Finite Size Effects in Phase Transitions

doi: 10.1103/PhysRevLett.94.202701
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2004AV03      Nucl.Phys. A736, 22 (2004)

V.Avdeichikov, R.Ghetti, J.Helgesson, B.Jakobsson, P.Golubev, N.Colonna, H.W.Wilschut

Analysis of charged particle emission sources and coalescence in E/A=61 MeV 36Ar + 27Al, 112Sn and 124Sn collisions

NUCLEAR REACTIONS 27Al, 112,124Sn(36Ar, pX), (36Ar, dX), (36Ar, tX), E=61 MeV/nucleon; measured particle spectra, correlations; deduced particle source features. Coalescence model.

doi: 10.1016/j.nuclphysa.2004.02.023
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2004GH07      Phys.Rev. C 69, 031605 (2004)

R.Ghetti, V.Avdeichikov, B.Jakobsson, P.Golubev, J.Helgesson, N.Colonna, G.Tagliente, H.W.Wilschut, S.Kopecky, V.L.Kravchuk, E.W.Anderson, P.Nadel-Turonski, L.Westerberg, V.Bellini, M.L.Sperduto, C.Sutera

Isospin effects on two-particle correlation functions in E/A = 61 MeV 36Ar + 112, 124Sn reactions

NUCLEAR REACTIONS 112,124Sn(36Ar, nX), (36Ar, pX), (36Ar, dX), (36Ar, tX), E=61 MeV/nucleon; measured particle spectra, two-particle correlation functions; deduced isospin effects.

doi: 10.1103/PhysRevC.69.031605
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2004GH10      Nucl.Phys. A734, 597 (2004)

R.Ghetti, J.Helgesson, and the CHIC Collaboration

Chronology of neutron, proton and deuteron emission in intermediate energy heavy ion reactions

NUCLEAR REACTIONS 27Al, 112,124Sn(36Ar, X), E=61 MeV/nucleon; analyzed velocity-gated correlation functions; deduced particle emission times.

doi: 10.1016/j.nuclphysa.2004.01.110
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2004GH15      Phys.Rev. C 70, 027601 (2004)

R.Ghetti, J.Helgesson, G.Lanzano, E.De Filippo, M.Geraci

Two-particle correlation functions in projectilelike emission experiments at very forward angles

NUCLEAR REACTIONS 27Al(40Ar, X), E=44, 77 MeV/nucleon; measured Ep, Eα, two-particle correlation functions.

doi: 10.1103/PhysRevC.70.027601
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2004GH16      Phys.Rev. C 70, 034601 (2004)

R.Ghetti, J.Helgesson, V.Avdeichikov, B.Jakobsson, N.Colonna, H.W.Wilschut

Isospin effects on particle emission time sequence in E/A=61 MeV 36Ar + 112, 124Sn reactions

NUCLEAR REACTIONS 112,124Sn(36Ar, X), E=61 MeV/nucleon; measured two-particle neutron, proton, and deuteron correlation functions; deduced emission time sequence, isospin effects.

doi: 10.1103/PhysRevC.70.034601
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2004HE08      Nucl.Phys. A734, 549 (2004)

J.Helgesson, R.Ghetti, L.G.Moretto, D.E.Breus, J.B.Elliot, L.W.Phair, G.J.Wozniak

Finite Size Scalings and the Nuclear Liquid-Gas Phase Transition

doi: 10.1016/j.nuclphysa.2004.01.102
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2003GH09      Phys.Rev.Lett. 91, 092701 (2003)

R.Ghetti, J.Helgesson, V.Avdeichikov, P.Golubev, B.Jakobsson, N.Colonna, G.Tagliente, S.Kopecky, V.L.Kravchuk, H.W.Wilschut, E.W.Anderson, P.Nadel-Turonski, L.Westerberg, V.Bellini, M.L.Sperduto, C.Sutera

Chronology of Particle Emission from the E/A = 61 MeV 36Ar + 27Al Reaction

NUCLEAR REACTIONS 27Al(36Ar, X), E=61 MeV/nucleon; measured neutron, proton, and deuteron correlation functions; deduced emission time distributions, dissipative binary reaction scenario.

doi: 10.1103/PhysRevLett.91.092701
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2003GH13      Nucl.Phys. A721, 313c (2003)

R.Ghetti, J.Helgesson, and the CHIC Collaboration

Particle emission time sequence intermediate energy heavy ion reactions

NUCLEAR REACTIONS 27Al(58Ni, X), E=45 MeV/nucleon; 27Al(36Ar, X), E=60 MeV/nucleon; measured En, Ep, np-coin; deduced correlation functions, emission time sequence.

doi: 10.1016/S0375-9474(03)01058-3
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2001GH03      Phys.Rev. C64, 017602 (2001)

R.Ghetti, J.Helgesson, N.Colonna, B.Jakobsson, A.Anzalone, V.Bellini, L.Carlen, S.Cavallaro, L.Celano, E.De Filippo, G.D'Erasmo, D.Di Santo, E.M.Fiore, A.Fokin, M.Geraci, F.Giustolisi, A.Kuznetsov, G.Lanzano, D.Mahboub, S.Marrone, F.Merchez, J.Martensson, F.Palazzolo, M.Palomba, A.Pantaleo, V.Paticchio, G.Riera, M.L.Sperduto, C.Sutera, G.Tagliente, M.Urrata, L.Westerberg, and the CHIC Collaboration

Influence of Multiple Sources on the Two-Neutron Correlation Function in Ni-Induced, Intermediate Energy, Heavy Ion Reactions

NUCLEAR REACTIONS 27Al, Ni, 197Au(58Ni, X), E=45 MeV/nucleon; measured neutron-neutron correlation functions; deduced multiple neutron sources, related reaction mechanism features.

doi: 10.1103/PhysRevC.64.017602
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2001GH04      Phys.Rev.Lett. 87, 102701 (2001)

R.Ghetti, J.Helgesson, N.Colonna, B.Jakobsson, A.Anzalone, V.Bellini, L.Carlen, S.Cavallaro, L.Celano, E.De Filippo, G.D'Erasmo, D.Di Santo, E.M.Fiore, A.Fokin, M.Geraci, F.Giustolisi, A.Kuznetsov, G.Lanzano, D.Mahboub, S.Marrone, J.Martensson, M.Palomba, A.Pantaleo, V.Paticchio, G.Riera, M.L.Sperduto, C.Sutera, G.Tagliente, M.Urrata

Possibility to Deduce the Emission Time Sequence of Neutrons and Protons from the Neutron-Proton Correlation Function

NUCLEAR REACTIONS 27Al(58Ni, X), E=45 MeV/nucleon; analyzed neutron-proton correlation functions; deduced emission time sequence.

doi: 10.1103/PhysRevLett.87.102701
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2001HE09      Nucl.Phys. A685, 346c (2001)

J.Helgesson

Spin-Isospin Modes in Heavy-Ion Collisions

doi: 10.1016/S0375-9474(01)00551-6
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2000GH05      Nucl.Phys. A674, 277 (2000)

R.Ghetti, J.Martensson, N.Colonna, J.Helgesson, B.Jakobsson, E.De Filippo, G.Tagliente, G.Lanzano, A.Pantaleo, V.Bellini, A.Anzalone, L.Carlen, S.Cavallaro, L.Celano, G.D'Erasmo, D.Di Santo, E.M.Fiore, A.Fokin, M.Geraci, F.Giustolisi, A.Kuznetsov, D.Mahboub, F.Palazzolo, M.Palomba, V.Paticchio, G.Riera, M.L.Sperduto, C.Sutera, M.Urrata, and the CHIC Collaboration

Characterization of Nuclear Sources from Neutron-Neutron, Proton-Proton and Neutron-Proton Correlation Function

NUCLEAR REACTIONS 27Al(58Ni, X), E=45 MeV/nucleon; measured proton spectra, neutron spectra, correlation functions; deduced source characteristics. Fermion interferometry.

doi: 10.1016/S0375-9474(00)00156-1
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2000GH09      Phys.Rev. C62, 037603 (2000)

R.Ghetti, N.Colonna, B.Jakobsson, J.Helgesson, J.Martensson, E.De Filippo, G.Tagliente, G.Lanzano, A.Pantaleo, V.Bellini, A.Anzalone, S.Cavallaro, L.Celano, G.D'Erasmo, D.Di Santo, E.M.Fiore, M.Geraci, F.Giustolisi, A.Kuznetsov, D.Mahboub, F.Merchez, M.Palomba, V.Paticchio, G.Riera, M.L.Sperduto, C.Sutera, M.Urrata, and the CHIC Collaboration

Neutron-Neutron Intensity Interferometry in E/A = 45 MeV 58Ni + 27Al, natNi, and 197Au Reactions

NUCLEAR REACTIONS 27Al, Ni, 197Au(58Ni, X), E=45 MeV/nucleon; measured neutron spectra, two-neutron correlation functions; deduced dynamical and evaporative emission mechanisms.

doi: 10.1103/PhysRevC.62.037603
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1999GH05      Nucl.Phys. A660, 20 (1999)

R.Ghetti, N.Colonna, J.Helgesson, E.De Filippo, G.Tagliente, A.Anzalone, V.Bellini, L.Carlen, S.Cavallaro, L.Celano, G.D'Erasmo, D.Di Santo, E.M.Fiore, A.Fokin, M.Geraci, B.Jakobsson, A.Kuznetsov, G.Lanzano, D.Mahboub, Yu.Murin, J.Martensson, A.Pagano, F.Palazzolo, M.Palomba, A.Pantaleo, V.Paticchio, R.Potenza, G.Riera, A.Siwek, M.L.Sperduto, C.Sutera, M.Urrata, L.Westerberg, and the CHIC Collaboration

Characterization of Nuclear Sources via Two-Neutron Intensity Interferometry

NUCLEAR REACTIONS 27Al(58Ni, X), E=45 MeV/nucleon; measured neutron spectra, two-neutron correlation functions; deduced source features. Two-neutron intensity interferometry, comparisons with evaporative, statistical model predictions.

doi: 10.1016/S0375-9474(99)00377-2
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1999HE19      Ann.Phys.(New York) 274, 1 (1999)

J.Helgesson, J.Randrup

Spin-Isospin Modes in Heavy-Ion Collisions II. Transport Simulations

NUCLEAR REACTIONS 1H(p, nX), E(cm)=2-3 GeV; calculated Δ production σ. 197Au(197Au, X), E=1 GeV/nucleon; 40Ar(p, X), E=500 MeV; calculated Δ production rates, invariant mass spectra, pions production rate, transverse momentum, related in-medium quantities. Transport simulations.

doi: 10.1006/aphy.1999.5906
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1998HE30      Phys.Lett. 439B, 243 (1998)

J.Helgesson, J.Randrup

Transport Simulations with π and Δ In-Medium Properties

NUCLEAR REACTIONS 197Au(197Au, X), E=1 GeV/nucleon; calculated Δ resonance decay widths, invariant mass, pions transverse momentum spectra; deduced in-medium effects. Transport calculations.

doi: 10.1016/S0370-2693(98)01109-5
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1997HE12      Phys.Rev. C56, 1187 (1997)

J.Helgesson, J.Randrup

Comment on ' Influence of the In-Medium Pion Dispersion Relation in Heavy Ion Collisions '

doi: 10.1103/PhysRevC.56.1187
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1997HE17      Phys.Rev. C56, 2626 (1997)

J.Helgesson, T.Csorgo, M.Asakawa, B.Lorstad

Quantum Statistical Correlations and Single Particle Distributions for Slowly Expanding Systems with Temperature Profile

NUCLEAR REACTIONS 197Au(40Ar, X), E=30 MeV/nucleon; analyzed proton spectrum, np correlation function; deduced particle emission time scale, collective radial flow.

doi: 10.1103/PhysRevC.56.2626
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1997HE19      Phys.Lett. 411B, 1 (1997)

J.Helgesson, J.Randrup

Effects of Spin-Isospin Modes in Transport Simulations

NUCLEAR REACTIONS 197Au(197Au, X), E=1 GeV/nucleon; calculated pion, Δ multiplicity, decay rates vs time, neutral pion transverse momentum spectra; deduced in-medium properties effects. Transport model.

doi: 10.1016/S0370-2693(97)00965-9
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1996HE04      Nucl.Phys. A597, 672 (1996)

J.Helgesson, J.Randrup

Treatment of Pionic Modes at the Nuclear Surface for Transport Descriptions

doi: 10.1016/0375-9474(95)00433-5
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1995HE15      Phys.Rev. C52, 427 (1995)

J.Helgesson, J.Randrup

Dilepton Production from Pion Annihilation in a Realistic Δ-Hole Model

doi: 10.1103/PhysRevC.52.427
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1995HE37      Ann.Phys.(New York) 244, 12 (1995)

J.Helgesson, J.Randrup

Spin-Isospin Modes in Heavy-Ion Collisions I: Nuclear Matter at Finite Temperatures

NUCLEAR REACTIONS 1H(π, X), E=high; calculated σ for Δ++ production σ vs invariant mass. 1H(p, X), E=high; calculated σ(θ) for Δ++. Microscopic transport simulations.

doi: 10.1006/aphy.1995.1106
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1995MU07      Phys.Rev. C51, 2794 (1995)

Yu.Murin, V.Avdeychikov, A.Bogdanov, O.Lozhkin, M.Zubkov, M.Berg, L.Carlen, R.Elmer, R.Ghetti, J.Helgesson, B.Jakobsson, B.Noren, J.Nyberg, L.Westerberg, K.Nybo, E.Olberg, T.-F.Thorsteinsen, M.Guttormsen, G.Lovhoiden, J.Bondorf, K.Sneppen, St.Mrowczynski, and the CHIC Collaboration

Isobaric Ratios of Fragments Emitted in Incomplete Fusion Reactions

NUCLEAR REACTIONS 112,124Sn, 197Au(14N, X), E=14, 32 MeV/nucleon; measured fragments yield, Z=1-5; deduced ratios of 3He/t, 6He/6Li yields, Coulomb barriers. Statistical models.

doi: 10.1103/PhysRevC.51.2794
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1994AR04      Nucl.Phys. A572, 600 (1994)

P.Arve, J.Helgesson

The NN-1, π and ΔN-1 Delta Decay Modes in the Nuclear Medium

doi: 10.1016/0375-9474(94)90402-2
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1994HE06      Phys.Scr. 49, 21 (1994)

J.Helgesson, V.Dmitriev

Effects of Energy Dependent Δ-Nucleus Optical Potential in Charge Exchange Reactions

NUCLEAR REACTIONS 12C(3He, t), E=2 GeV; 12C(p, n), E=830 MeV; calculated σ(θ, Et), σ(θ, En). Energy-dependent Δ-nucleus optical potential.

doi: 10.1088/0031-8949/49/1/003
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1994HE36      Z.Phys. A350, 237 (1994)

J.Helgesson, P.Arve

The Decay of Spin-Isospin Modes in a Semi-Infinite Slab

doi: 10.1007/BF01289588
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1993CR05      Phys.Lett. 317B, 505 (1993)

M.Cronqvist, O.Skeppstedt, M.Berg, L.Carlen, R.Elmer, R.Ghetti, J.Helgesson, B.Jakobsson, B.Noren, A.Oskarsson, F.Merchez, D.Rebreyend, L.Westerberg, V.Avdeychikov, A.Bogdanov, O.Lozhkin, Yu.Murin, K.Nybo, E.Olberg, T.-F.Thorsteinsen, and the CHIC Collaboration

Neutron-Proton Interferometry in 30A MeV 40Ar + 197Au Collisions

NUCLEAR REACTIONS 197Au, 12C, C, 1H(40Ar, X), E=30 MeV/nucleon; measured nn-, np-, pp-correlation functions; deduced relative correlation strength, mechanisms causing differences.

doi: 10.1016/0370-2693(93)91363-R
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1990GU08      Phys.Lett. 241B, 322 (1990)

H.-A.Gustafsson, B.Jakobsson, A.Kristiansson, A.Oskarsson, M.Westenius, P.Arve, J.Helgesson, L.Westerberg, K.Aleklett, A.J.Kordyasz, L.Lavergne-Gosselin, L.Stab

Deviations from Pure Target Fragmentation in 94A MeV 16O Induced Heavy Ion Reactions

NUCLEAR REACTIONS 27Al(16O, X), E=94 MeV/nucleon; measured σ(fragment θ, E); deduced reaction mechanism.

doi: 10.1016/0370-2693(90)91650-Z
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1989HE30      Phys.Scr. 40, 595 (1989)

J.Helgesson, I.Hamamoto

Dependence of Nuclear Moments of Inertia on the Triaxial Parameter

NUCLEAR STRUCTURE A=152; calculated neutron, proton contribution to moment of inertia vs triaxial parameter.

doi: 10.1088/0031-8949/40/5/005
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