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NSR database version of May 24, 2024.

Search: Author = M.Schafer

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2023BA26      Phys.Lett. B 844, 138078 (2023)

M.Bagnarol, M.Schafer, B.Bazak, N.Barnea

Five-body calculation of s-wave n-4He scattering at next-to-leading order pionless effective field theory

NUCLEAR REACTIONS 4He(n, n), E<6 MeV; calculated five-body s-wave scattering within leading order and next-to-leading order (NLO) pionless effective field theory using an harmonic oscillator trap technique, phase shifts, scattering length and effective range. Comparison with experimental data.

doi: 10.1016/j.physletb.2023.138078
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2023SC07      Phys.Rev. C 107, 064001 (2023)

M.Schafer, B.Bazak

Few-nucleon scattering in pionless effective field theory

NUCLEAR REACTIONS 2,3H, 3He(n, n), 2H(d, d), E nit given; calculated scattering lengths and effective range, phase shifts. Pionless effective field theory up to next-to-leading order. Comparison to available experimental data.

NUCLEAR STRUCTURE 2H, 4He; calculated binding energy.

doi: 10.1103/PhysRevC.107.064001
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2022SC02      Phys.Rev. C 105, 015202 (2022)

M.Schafer, B.Bazak, N.Barnea, A.Gal, J.Mares

Consequences of increased hypertriton binding for s-shell Λ-hypernuclear systems

NUCLEAR STRUCTURE 3,5H; analyzed spin-singlet and spin-triplet scattering lengths for 3H hypernucleus from Λp data, binding energies for 3H and 5H hypernuclei for several different interaction strengths, ratio of the hypertriton excited state lifetime to the free Λ lifetime. Pionless effective field theory (EFT) approach at leading order for s-shell hypernuclei, constrained by the binding energies of the 0+ and 1+ states of 4H hypernucleus. Comparison with experimental binding energies from emulsion data, and from STAR collaboration. Relevance to anticipated measurements of the Λd correlation function at ALICE2CERN and new experiments at MAMI and J-PARC, JLAB, and ELPH facilities for more precise determination of binding energy of hypertriton, and its excited state.

doi: 10.1103/PhysRevC.105.015202
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2022SC09      Phys.Rev. C 106, L031001 (2022)

M.Schafer, N.Barnea, A.Gal

In-medium Λ isospin impurity from charge symmetry breaking in the 4ΛH-4ΛHe mirror hypernuclei

NUCLEAR STRUCTURE 4H, 4He; calculated charge symmetry breaking in the mirror hypernuclei, I = 1 admixture amplitude in the Λ hyperon, charge symmetry broken values of the ΛN scattering lengths. Pionless effective field theory using partially conserved baryon-baryon SU(3) flavor symmetry.

doi: 10.1103/PhysRevC.106.L031001
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2021SC07      Phys.Rev. C 103, 025204 (2021)

M.Schafer, B.Bazak, N.Barnea, J.Mares

Nature of the Λnn (Jπ = 1/2+, I=1) and 3ΛH*(Jπ = 3/2+, I=0) states

NUCLEAR STRUCTURE 3n, 3H; calculated energies of the bound states of Λnn and 3ΛH hyper nuclei, real and imaginary parts of the resonance energies and virtual states, trajectories of the nn resonance pole in a complex energy plane. 4H, 5He; calculated separation energies of hypernuclei. Pionless effective field theory at leading order, and stochastic variational method (SVM).

doi: 10.1103/PhysRevC.103.025204
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2003YO02      Phys.Rev. C 67, 014316 (2003)

K.Yoneda, N.Aoi, H.Iwasaki, H.Sakurai, H.Ogawa, T.Nakamura, W.-D.Schmidt-Ott, M.Schafer, M.Notani, N.Fukuda, E.Ideguchi, T.Kishida, S.S.Yamamoto, M.Ishihara

β-decay half-lives and β-delayed neutron multiplicities of the neutron drip-line nuclei 19B, 22C, and 23N

RADIOACTIVITY 15,19B, 20,22C, 22,23N(β-), (β-n) [from Ta(40Ar, X)]; measured β-decay T1/2, β-delayed neutron multiplicities. Comparison with previous work, model predictions.

doi: 10.1103/PhysRevC.67.014316
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1999BE58      Eur.Phys.J. A 6, 329 (1999)

J.Becker, H.G.Andresen, J.R.M.Annand, K.Aulenbacher, K.Beuchel, J.Blume-Werry, Th.Dombo, P.Drescher, M.Ebert, D.Eyl, A.Frey, P.Grabmayr, T.Grossmann, P.Hartmann, T.Hehl, W.Heil, C.Herberg, J.Hoffmann, J.D.Kellie, F.Klein, K.Livingston, M.Leduc, M.Meyerhoff, H.Moller, Ch.Nachtigall, A.Natter, M.Ostrick, E.W.Otten, R.O.Owens, S.Plutzer, E.Reichert, D.Rohe, M.Schafer, H.Schmieden, R.Sprengard, M.Steigerwald, K.-H.Steffens, R.Surkau, Th.Walcher, R.Watson, E.Wilms

Determination of the Neutron Electric Form Factor from the Reaction 3He(e, e'n) at Medium Momentum Transfer

NUCLEAR REACTIONS 3He(polarized e, e'n), E not given; measured σ(θ), asymmetry vs momentum transfer. 1n deduced electric form factor. Polarized target. Comparisons with previous results.

doi: 10.1007/s100500050351
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1999OG03      Phys.Lett. 451B, 11 (1999)

H.Ogawa, K.Asahi, K.Sakai, A.Yoshimi, M.Tsuda, Y.Uchiyama, T.Suzuki, K.Suzuki, N.Kurokawa, M.Adachi, H.Izumi, H.Ueno, T.Shimoda, S.Tanimoto, N.Takahashi, W.-D.Schmidt-Ott, M.Schafer, S.Fukuda, A.Yoshida, M.Notani, T.Kubo, H.Okuno, H.Sato, N.Aoi, K.Yoneda, H.Iwasaki, N.Fukuda, N.Fukunishi, M.Ishihara, H.Miyatake

Magnetic Moment and Electric Quadrupole Moment of the 18N Ground State

RADIOACTIVITY 18N(β-) [from 22Ne fragmentation]; measured β-NMR. 18Ne deduced μ, quadrupole moment.

NUCLEAR REACTIONS 12C(22Ne, X)18N, E=110 MeV/nucleon; measured fragment polarization.

doi: 10.1016/S0370-2693(99)00219-1
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1998OG04      J.Phys.(London) G24, 1399 (1998)

H.Ogawa, K.Asahi, K.Sakai, A.Yoshimi, M.Tsuda, Y.Uchiyama, T.Suzuki, K.Suzuki, N.Kurokawa, M.Adachi, H.Izumi, H.Ueno, T.Shimoda, S.Tanimoto, N.Takahashi, W.-D.Schmidt-Ott, M.Schafer, S.Fukuda, A.Yoshida, M.Notani, T.Kubo, H.Okuno, H.Sato, N.Aoi, K.Yoneda, H.Iwasaki, N.Fukuda, N.Fukunishi, M.Ishihara

Static Moments of the 18N Ground State

RADIOACTIVITY 18N(β-) [from 22Ne primary beam fragmentation]; measured Iβ(H, t). 18N deduced ground-state Q, μ. β-NMR technique.

1998SC19      Phys.Rev. C57, 2205 (1998)

M.Schafer, W.-D.Schmidt-Ott, T.Dorfler, T.Hild, T.Pfeiffer, R.Collatz, H.Geissel, M.Hellstrom, Z.Hu, H.Irnich, N.Iwasa, M.Pfutzner, E.Roeckl, M.Shibata, B.Pfeiffer, K.Asahi, H.Izumi, H.Ogawa, H.Sato, H.Ueno, H.Okuno

Polarization in Fragmentation, g Factor of 35K

NUCLEAR REACTIONS 9Be(40Ca, X)39Ca/35K/37K, E=500 MeV/nucleon; measured fragments beta asymmetry; deduced polarization. 35K deduced g factor. Projectile fragment separator.

RADIOACTIVITY 35K(β+) [from 9Be(40Ca, X)]; measured T1/2. Projectile fragment separator.

doi: 10.1103/PhysRevC.57.2205
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1995BR13      Phys.Lett. 348B, 325 (1995)

E.L.Bratkovskaya, M.Schafer, W.Cassing, U.Mosel, O.V.Teryaev, V.D.Toneev

Anisotropy of Dilepton Emission from Nucleon-Nucleon Interactions

NUCLEAR REACTIONS 1n, 1H(p, γ), E=0.1-2.1 GeV; calculated anisotropy coefficient vs E, dilepton production differential σ. NN- bremsstrahlung, Δ-resonance.

doi: 10.1016/0370-2693(95)00140-G
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1995DO02      Phys.Rev. C51, 950 (1995)

H.C.Donges, M.Schafer, U.Mosel

Microscopic Model of the Timelike Electromagnetic Form Factor of the Nucleon

NUCLEAR STRUCTURE 1H, 1n; calculated timelike electromagnetic form factors. Microscopic model.

doi: 10.1103/PhysRevC.51.950
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1995SC13      Phys.Lett. 342B, 13 (1995)

M.Schafer, H.C.Donges, U.Mosel

Electromagnetic Form Factor of the Nucleon in the Time-Like Region

NUCLEAR REACTIONS 1H(γ, e+e-), E=1.2 GeV; calculated σ(θ(e+), θ(e-)) vs dilepton pair invariant mass; deduced nucleon electromagnetic form factor in time-like region role. Vector dominance model.

doi: 10.1016/0370-2693(94)01394-R
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1994EN01      Nucl.Phys. A572, 657 (1994)

A.Engel, W.Cassing, U.Mosel, M.Schafer, Gy.Wolf

Pion-Nucleus Reactions in a Microscopic Transport Model

NUCLEAR REACTIONS 1H(π-, X), E=high; calculated Δ0 production σ(E). 1H(p, nπ+), E=high; calculated σ(E). 12C, 56Fe, 209Bi(π+, X), E=100-300 MeV; calculated σ(E). 12C, 209Bi(π+, π+'), E=160 MeV; calculated σ(θ). 209Bi(π+, X), E=85 MeV; calculated Δ-mass distribution, different delta generations.

doi: 10.1016/0375-9474(94)90405-7
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1994ME09      Phys.Lett. 327B, 201 (1994)

M.Meyerhoff, D.Eyl, A.Frey, H.G.Andresen, J.R.M.Annand, K.Aulenbacher, J.Becker, J.Blume-Werry, Th.Dombo, P.Drescher, J.R.Ducret, H.Fischer, P.Grabmayr, S.Hall, P.Hartmann, T.Hehl, W.Heil, J.Hoffmann, J.D.Kellie, F.Klein, M.Leduc, H.Moller, Ch.Nachtigall, M.Ostrick, E.W.Otten, R.O.Owens, S.Plutzer, E.Reichert, D.Rohe, M.Schafer, L.D.Schearer, H.Schmieden, K.-H.Steffens, R.Surkau, Th.Walcher

First Measurement of the Electric Formfactor of the Neutron in the Exclusive Quasielastic Scattering of Polarized Electrons from Polarized 3He

NUCLEAR REACTIONS 3He(polarized e, e'n), (polarized e, e'p), E=855 MeV; measured asymmetry. 1n deduced binding effects independent electric form factor. Polarized target.

doi: 10.1016/0370-2693(94)90718-8
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1994SC21      Nucl.Phys. A575, 429 (1994)

M.Schafer, H.C.Donges, A.Engel, U.Mosel

Dilepton Production in Nucleon-Nucleon Interactions

doi: 10.1016/0375-9474(94)90370-0
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1991SC20      Z.Phys. A339, 391 (1991)

M.Schafer, T.S.Biro, W.Cassing, U.Mosel, H.Nifenecker, J.A.Pinston

Photon Production in Nucleon-Nucleon Collisions

NUCLEAR REACTIONS 1H(p, γ)(n, γ), E ≤ 400 MeV; calculated σ(θγ, Eγ), σ(E). Realistic meson exchange approximation.

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