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NSR database version of April 11, 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 ⁴_ΛH-⁴_ΛHe 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 (J^π = 1/2⁺, I=1) and ³_ΛH^*(J^π = 3/2⁺, I=0) states

NUCLEAR STRUCTURE ³n, ³H; calculated energies of the bound states of Λnn and ³_ΛH 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 T_1/2, 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 T_1/2. 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.