1
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Camacho-Guardian A, Peña Ardila LA, Pohl T, Bruun GM. Bipolarons in a Bose-Einstein Condensate. PHYSICAL REVIEW LETTERS 2018; 121:013401. [PMID: 30028169 DOI: 10.1103/physrevlett.121.013401] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Indexed: 06/08/2023]
Abstract
Mobile impurities in a Bose-Einstein condensate form quasiparticles called polarons. Here, we show that two such polarons can bind to form a bound bipolaron state. Its emergence is caused by an induced nonlocal interaction mediated by density oscillations in the condensate, and we derive using field theory an effective Schrödinger equation describing this for an arbitrarily strong impurity-boson interaction. We furthermore compare with quantum Monte Carlo simulations finding remarkable agreement, which underlines the predictive power of the developed theory. It is found that bipolaron formation typically requires strong impurity interactions beyond the validity of more commonly used weak-coupling approaches that lead to local Yukawa-type interactions. We predict that the bipolarons are observable in present experiments, and we describe a procedure to probe their properties.
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Affiliation(s)
- A Camacho-Guardian
- Center for Quantum Optics and Quantum Matter, Department of Physics and Astronomy, Aarhus University, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | - L A Peña Ardila
- Center for Quantum Optics and Quantum Matter, Department of Physics and Astronomy, Aarhus University, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | - T Pohl
- Center for Quantum Optics and Quantum Matter, Department of Physics and Astronomy, Aarhus University, Ny Munkegade, DK-8000 Aarhus C, Denmark
| | - G M Bruun
- Center for Quantum Optics and Quantum Matter, Department of Physics and Astronomy, Aarhus University, Ny Munkegade, DK-8000 Aarhus C, Denmark
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2
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Darwish EM, Abd El-Daiem A, Abd El-Wahab MM. Single and double spin asymmetries in the elastic e-d scattering and their dependence on the deuteron wave function. PHYSICS OF PARTICLES AND NUCLEI LETTERS 2017; 14:822-835. [DOI: 10.1134/s1547477117060115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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3
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Rios A, Polls A, Dickhoff WH. Pairing and Short-Range Correlations in Nuclear Systems. JOURNAL OF LOW TEMPERATURE PHYSICS 2017; 189:234-249. [PMID: 31258176 PMCID: PMC6560486 DOI: 10.1007/s10909-017-1818-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 10/04/2017] [Indexed: 06/09/2023]
Abstract
The structure and density dependence of the pairing gap in infinite matter is relevant for astrophysical phenomena and provides a starting point for the discussion of pairing properties in nuclear structure. Short-range correlations can significantly deplete the available single-particle strength around the Fermi surface and thus provide a reduction mechanism of the pairing gap. Here, we study this effect in the singlet and triplet channels of both neutron matter and symmetric nuclear matter. Our calculations use phase-shift equivalent interactions and chiral two-body and three-body interactions as a starting point. We find an unambiguous reduction of the gap in all channels with very small dependence on the NN force in the singlet neutron matter and the triplet nuclear matter channel. In the latter channel, SRC alone provide a 50% reduction of the pairing gap.
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Affiliation(s)
- A. Rios
- Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH UK
| | - A. Polls
- Departament de Fsica Quàntica i Astrofísica and Institut de Ciènces del Cosmos, Universitat de Barcelona, Avinguda Diagonal 647, 8028 Barcelona, Spain
| | - W. H. Dickhoff
- Department of Physics, Washington University, St. Louis, MO 63130 USA
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4
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Benrachi F, Khiter M, Laouet N. Spectroscopic properties of 130Sb, 132Te and 134I nuclei in 100-132Sn magic cores. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201715401016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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5
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Bonnard J, Lenzi SM, Zuker AP. Neutron Skins and Halo Orbits in the sd and pf Shells. PHYSICAL REVIEW LETTERS 2016; 116:212501. [PMID: 27284653 DOI: 10.1103/physrevlett.116.212501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Indexed: 06/06/2023]
Abstract
The strong dependence of Coulomb energies on nuclear radii makes it possible to extract the latter from calculations of the former. The resulting estimates of neutron skins indicate that two mechanisms are involved. The first one-isovector monopole polarizability-amounts to noting that when a particle is added to a system it drives the radii of neutrons and protons in different directions, tending to equalize the radii of both fluids independently of the neutron excess. This mechanism is well understood and the Duflo-Zuker (small) neutron skin values derived 14 years ago are consistent with recent measures and estimates. The alternative mechanism involves halo orbits whose huge sizes tend to make the neutron skins larger and have a subtle influence on the radial behavior of sd and pf shell nuclei. In particular, they account for the sudden rise in the isotope shifts of nuclei beyond N=28 and the near constancy of radii in the A=40-56 region. This mechanism, detected here for the first time, is not well understood and may well go beyond the Efimov physics usually associated with halo orbits.
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Affiliation(s)
- J Bonnard
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, 35131 Padova, Italy
| | - S M Lenzi
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, 35131 Padova, Italy
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
| | - A P Zuker
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- Université de Strasbourg, IPHC, CNRS, UMR7178, 23 rue du Loess, 67037 Strasbourg, France
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6
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Janek M, Ladygin VP, Piyadin SM, Gurchin YV, Isupov AY, Karachuk JT, Khrenov AN, Kurilkin AK, Kurilkin PK, Livanov AN, Martinska G, Reznikov SG, Tarjanyiova G, Terekhin AA, Vnukov IE. Experimental investigation of dp→ ppnreaction at intermediate energies at Nuclotron. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201613007007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7
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Effect of Tensor Correlations on the Density Dependence of the Nuclear Symmetry Energy. Symmetry (Basel) 2014. [DOI: 10.3390/sym7010015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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8
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Somà V, Rios A. Nucleon mean-free path in the medium. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146603081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Rios A, Somà V. Self-consistent Green's function calculation of the nucleon mean free path. PHYSICAL REVIEW LETTERS 2012; 108:012501. [PMID: 22304257 DOI: 10.1103/physrevlett.108.012501] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Indexed: 05/31/2023]
Abstract
The extension of Green's functions techniques to the complex energy plane provides access to fully dressed quasiparticle properties from a microscopic perspective. Using self-consistent ladder self-energies, we find both spectra and lifetimes of such quasiparticles in nuclear matter. With a consistent choice of the group velocity, the nucleon mean-free path can be computed. Our results indicate that, for energies above 50 MeV at densities close to saturation, a nucleon has a mean-free path of 4 to 5 fm.
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Affiliation(s)
- Arnau Rios
- Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
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10
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Fujii S, Okamoto R, Suzuki K. Ground-state and single-particle energies of nuclei around 16O, 40Ca, and 56Ni from realistic nucleon-nucleon forces. PHYSICAL REVIEW LETTERS 2009; 103:182501. [PMID: 19905800 DOI: 10.1103/physrevlett.103.182501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Indexed: 05/28/2023]
Abstract
We perform ab initio calculations for nuclei around 16O, 40Ca, and 56Ni using realistic nucleon-nucleon forces. In particular, 56Ni is computed as the heaviest nucleus in this kind of ab initio calculation. Ground-state and single-particle energies including three-body-cluster effects are obtained within the framework of the unitary-model-operator approach. It is shown that the CD-Bonn nucleon-nucleon potential gives quite good results close to the experimental values for all nuclei in the present work.
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Affiliation(s)
- S Fujii
- Center for Research and Advancement in Higher Education, Kyushu University, Fukuoka 819-0395, Japan.
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11
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Jungclaus A, Cáceres L, Górska M, Pfützner M, Pietri S, Werner-Malento E, Grawe H, Langanke K, Martínez-Pinedo G, Nowacki F, Poves A, Cuenca-García JJ, Rudolph D, Podolyak Z, Regan PH, Detistov P, Lalkovski S, Modamio V, Walker J, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grebosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Wollersheim HJ, Andgren K, Benlliure J, Benzoni G, Bruce AM, Casarejos E, Cederwall B, Crespi FCL, Hadinia B, Hellström M, Hoischen R, Ilie G, Jolie J, Khaplanov A, Kmiecik M, Kumar R, Maj A, Mandal S, Montes F, Myalski S, Simpson GS, Steer SJ, Tashenov S, Wieland O. Observation of isomeric decays in the r-process waiting-point nucleus 130Cd82. PHYSICAL REVIEW LETTERS 2007; 99:132501. [PMID: 17930581 DOI: 10.1103/physrevlett.99.132501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Indexed: 05/25/2023]
Abstract
The gamma decay of excited states in the waiting-point nucleus (130)Cd(82) has been observed for the first time. An 8(+) two-quasiparticle isomer has been populated both in the fragmentation of a (136)Xe beam as well as in projectile fission of 238U, making (130)Cd the most neutron-rich N = 82 isotone for which information about excited states is available. The results, interpreted using state-of-the-art nuclear shell-model calculations, show no evidence of an N = 82 shell quenching at Z = 48. They allow us to follow nuclear isomerism throughout a full major neutron shell from (98)Cd(50) to (130)Cd(82) and reveal, in comparison with (76)Ni(48) one major proton shell below, an apparently abnormal scaling of nuclear two-body interactions.
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Affiliation(s)
- A Jungclaus
- Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
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12
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Dytrych T, Sviratcheva KD, Bahri C, Draayer JP, Vary JP. Evidence for symplectic symmetry in Ab initio no-core shell model results for light nuclei. PHYSICAL REVIEW LETTERS 2007; 98:162503. [PMID: 17501416 DOI: 10.1103/physrevlett.98.162503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Indexed: 05/15/2023]
Abstract
Clear evidence for symplectic symmetry in low-lying states of 12C and 16O is reported. Eigenstates of 12C and 16O, determined within the framework of the no-core shell model using the J-matrix inverse scattering potential with A<or=16 (JISP16) nucleon-nucleon (NN) realistic interaction, typically project at the 85%-90% level onto a few of the most deformed symplectic basis states that span only a small fraction of the full model space. The results are nearly independent of whether the bare or renormalized effective interactions are used in the analysis. The outcome confirms Elliott's SU(3) model which underpins the symplectic scheme, and above all, points to the relevance of a symplectic no-core shell model that can reproduce experimental B(E2) values without effective charges as well as deformed spatial modes associated with clustering phenomena in nuclei.
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Affiliation(s)
- Tomás Dytrych
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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13
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Fabrocini A, Fantoni S, Illarionov AY, Schmidt KE. 1S0 Superfluid phase transition in neutron matter with realistic nuclear potentials and modern many-body theories. PHYSICAL REVIEW LETTERS 2005; 95:192501. [PMID: 16383974 DOI: 10.1103/physrevlett.95.192501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2005] [Indexed: 05/05/2023]
Abstract
The 1S0 pairing in neutron matter is studied using realistic two- and three-nucleon interactions. The auxiliary field diffusion Monte Carlo method and correlated basis function theory are employed to get quantitative and reliable estimates of the gap. The two methods are in good agreement up to the maximum gap density and both point to a slight reduction with respect to the standard BCS value. In fact, the maximum gap is about 2.5 MeV at kF approximately 0.8 fm(-1) in BCS and 2.2-2.4 MeV at kF approximately 0.6 fm(-1)in correlated matter. In general, the computed medium polarization effects are much smaller than those previously estimated within all theories. Truncations of Argonne to simpler forms give the same gaps in BCS, provided the truncated potentials have been refitted to the same data set. The three-nucleon interaction provides an additional increase of the gap of about 0.35 MeV.
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Affiliation(s)
- Adelchi Fabrocini
- Dipartimento di Fisica Enrico Fermi, Università di Pisa, Pisa, Italy.
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14
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Dillmann I, Kratz KL, Wöhr A, Arndt O, Brown BA, Hoff P, Hjorth-Jensen M, Köster U, Ostrowski AN, Pfeiffer B, Seweryniak D, Shergur J, Walters WB. N=82 shell quenching of the classical r-process "waiting-point" nucleus 130Cd. PHYSICAL REVIEW LETTERS 2003; 91:162503. [PMID: 14611397 DOI: 10.1103/physrevlett.91.162503] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2003] [Indexed: 05/24/2023]
Abstract
First beta- and gamma-spectroscopic decay studies of the N=82 r-process "waiting-point" nuclide 130Cd have been performed at CERN/ISOLDE using the highest achievable isotopic selectivity. Several nuclear-physics surprises have been discovered. The first one is the unanticipatedly high energy of 2.12 MeV for the [pi g(9/2) multiply sign in circle nu g(7/2)] 1(+) level in 130In, which is fed by the main Gamow-Teller transition. The second surprise is the rather high Q(beta) value of 8.34 MeV, which is in agreement only with recent mass models that include the phenomenon of N=82 shell quenching. Possible implications of these new results on the formation of the A approximately 130 r-process abundance peak are presented.
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Affiliation(s)
- I Dillmann
- Institut für Kernchemie, Universität Mainz, Mainz, Germany and Departement für Physik und Astronomie, Universität Basel, Basel, Switzerland
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15
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Hayes AC, Navrátil P, Vary JP. Neutrino-12C scattering in the Ab initio shell model with a realistic three-body interaction. PHYSICAL REVIEW LETTERS 2003; 91:012502. [PMID: 12906537 DOI: 10.1103/physrevlett.91.012502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2003] [Indexed: 05/24/2023]
Abstract
We investigate cross sections for neutrino-12C exclusive scattering and for muon capture on 12C using wave functions obtained in the ab initio no-core shell model. In our parameter-free calculations with basis spaces up to the 6 variant Planck's over 2pi Omega we show that realistic nucleon-nucleon interactions, like, e.g., the CD-Bonn, underpredict the experimental cross sections by more than a factor of 2. By including a realistic three-body interaction, Tucson-Melbourne TM'(99), the cross sections are enhanced significantly and a much better agreement with experiment is achieved. At the same time, the TM'(99) interaction improves the calculated level ordering in 12C. The comparison between the CD-Bonn and the three-body calculations provides strong confirmation for the need to include a realistic three-body interaction to account for the spin-orbit strength in p-shell nuclei.
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Affiliation(s)
- A C Hayes
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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16
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Wiringa RB, Pieper SC. Evolution of nuclear spectra with nuclear forces. PHYSICAL REVIEW LETTERS 2002; 89:182501. [PMID: 12398591 DOI: 10.1103/physrevlett.89.182501] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2002] [Indexed: 05/24/2023]
Abstract
We first define a series of NN interaction models ranging from very simple to fully realistic. We then present Green's function Monte Carlo calculations of light nuclei to show how nuclear spectra evolve as the nuclear forces are made increasingly sophisticated. We find that the absence of stable five- and eight-body nuclei depends crucially on the spin, isospin, and tensor components of the nuclear force.
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Affiliation(s)
- R B Wiringa
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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17
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Nogga A, Kamada H, Glöckle W. The hypernuclei (4)(lambda)He and (4)(lambda)H: challenges for modern hyperon-nucleon forces. PHYSICAL REVIEW LETTERS 2002; 88:172501. [PMID: 12005746 DOI: 10.1103/physrevlett.88.172501] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2001] [Indexed: 05/23/2023]
Abstract
The hypernuclei (4)(Lambda)He and (4)(Lambda)H provide important information on the hyperon-nucleon interaction. We present accurate Faddeev-Yakubovsky calculations for the Lambda separation energies of the 0(+) ground and the 1(+) excited states based on the Nijmegen SC YN interactions. We explicitly take the Sigma admixture into account. Mass differences of the baryons and the charge dependence of the interaction are considered. The results show that the Nijmegen models cannot predict all separation energies simultaneously hinting to failures of the current interaction models. It is pointed out that the differences of the Lambda separation energies of (4)(Lambda)He and (4)(Lambda)H are interesting observables to probe the YN interaction models.
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Affiliation(s)
- A Nogga
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
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18
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Navrátil P, Ormand WE. Ab initio shell model calculations with three-body effective interactions for p-shell nuclei. PHYSICAL REVIEW LETTERS 2002; 88:152502. [PMID: 11955193 DOI: 10.1103/physrevlett.88.152502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2001] [Indexed: 05/23/2023]
Abstract
We present a qualitative improvement of the ab initio no-core shell model (NCSM) approach by implementing three-body interaction capability for p-shell nuclei. We report the first calculations using three-body effective interactions derived from realistic nucleon-nucleon potentials for 6Li, 8Be, and 10B and demonstrate that the use of three-body effective interactions speeds up the convergence of the NCSM approach. For 10B, we predict JpiT = 1(+)0 ground state, contrary to the experimental observation of 3(+)0, when the AV8(') potential is used, indicating the need for true three-body forces.
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Affiliation(s)
- Petr Navrátil
- Lawrence Livermore National Laboratory, L-414, P.O. Box 808, Livermore, California 94551, USA
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19
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Navrátil P, Vary JP, Ormand WE, Barrett BR. Six-nucleon spectroscopy from a realistic nonlocal Hamiltonian. PHYSICAL REVIEW LETTERS 2001; 87:172502. [PMID: 11690268 DOI: 10.1103/physrevlett.87.172502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2001] [Indexed: 05/23/2023]
Abstract
We apply the ab initio no-core nuclear shell model to solve the six-nucleon systems, (6)Li and (6)He, interacting by realistic nucleon-nucleon ( NN) potentials. In particular, we present the first results for A = 6 with the nonlocal CD-Bonn NN potential. The resulting (6)Li binding energy -29.3(6) MeV and the excitation spectra improve the agreement between the theory and experiment compared to results with local NN potentials, but the need for the inclusion of a real three-body interaction and/or further improvement of the NN forces remains. We predict properties of the (6)He dipole modes, a subject of current controversy.
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Affiliation(s)
- P Navrátil
- Lawrence Livermore National Laboratory, L-414, P.O. Box 808, Livermore, California 94551 and Nuclear Physics Institute, Academy of Sciences of the Czech Republic, 250 68 Rez near Prague, Czech Republic
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20
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Ermisch K, van den Berg AM, Bieber R, Glöckle W, Golak J, Hagemann M, Hannen VM, Harakeh MN, de Huu MA, Kalantar-Nayestanaki N, Kamada H, Kis M, Kuroś-Zołnierczuk J, Mahjour-Shafiei M, Micherdzińska A, Nogga A, Skibiński R, Witała H, Wörtche HJ. Search for three-nucleon force effects in analyzing powers for p-->d elastic scattering. PHYSICAL REVIEW LETTERS 2001; 86:5862-5865. [PMID: 11415380 DOI: 10.1103/physrevlett.86.5862] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2001] [Indexed: 05/23/2023]
Abstract
A series of measurements have been performed at KVI to obtain the vector analyzing power A(y) of the (2)H(p-->,pd) reaction as a function of incident beam energy at energies of 120, 135, 150, and 170 MeV. For all these measurements, a range of theta(c.m.) from 30 degrees to 170 degrees has been covered. The purpose of these investigations is to observe possible spin-dependent effects beyond two-nucleon forces. When compared to the predictions of Faddeev calculations, based on two-nucleon forces only, significant deviations are observed at all energies and at center-of-mass angles between 70 degrees and 130 degrees. The addition of present-day three-nucleon forces does not improve the description of the data, demonstrating the still insufficient understanding of the properties of three-nucleon systems.
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Affiliation(s)
- K Ermisch
- Kernfysisch Versneller Instituut, NL-9747 AAGroningen, The Netherlands
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21
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Epelbaum E, Kamada H, Nogga A, Witala H, Glöckle W, Meissner UG. Three- and four-nucleon systems from chiral effective field theory. PHYSICAL REVIEW LETTERS 2001; 86:4787-4790. [PMID: 11384348 DOI: 10.1103/physrevlett.86.4787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2000] [Indexed: 05/23/2023]
Abstract
Recently developed chiral nucleon-nucleon (NN) forces at next-to-leading order (NLO), that describe NN phase shifts up to about 100 MeV fairly well, have been applied to 3N and 4N systems. Faddeev-Yakubovsky equations have been solved rigorously. The resulting 3N and 4N binding energies are in the same range as found using standard NN potentials. In addition, low-energy 3N scattering observables are very well reproduced as for standard NN forces. The long-standing A(y) puzzle is absent at NLO. The cutoff dependence of the scattering observables is rather weak.
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Affiliation(s)
- E Epelbaum
- Forschungszentrum Jülich, Institut für Kernphysik (Theorie), D-52425 Jülich, Germany
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22
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Cadman RV, Brack J, Cummings WJ, Fedchak JA, Fox BD, Gao H, Glöckle W, Golak J, Grosshauser C, Holt RJ, Jones CE, Kamada H, Kinney ER, Miller MA, Nagengast W, Nogga A, Owen BR, Rith K, Schmidt F, Schulte EC, Sowinski J, Sperisen F, Thorsland EL, Tobey R, Wilbert J, Witała H. Evidence for a three-nucleon-force effect in proton-deuteron elastic scattering. PHYSICAL REVIEW LETTERS 2001; 86:967-970. [PMID: 11177986 DOI: 10.1103/physrevlett.86.967] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2000] [Indexed: 05/23/2023]
Abstract
Developments in spin-polarized internal targets for storage rings have permitted measurements of 197 MeV polarized protons scattering from vector polarized deuterons. This work presents measurements of the polarization observables A(y), iT11, and C(y,y) in proton-deuteron elastic scattering. When compared to calculations with and without three-nucleon forces, the measurements provide further evidence that three-nucleon forces make a contribution to the observables. This work indicates that three-body forces derived from static nuclear properties appear to be crucial to the description of dynamical properties.
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Affiliation(s)
- R V Cadman
- Department of Physics, University of Illinois, Urbana 61801, USA
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23
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Garçon M, Van Orden JW. The Deuteron: Structure and Form Factors. ADVANCES IN THE PHYSICS OF PARTICLES AND NUCLEI 2001. [DOI: 10.1007/0-306-47915-x_4] [Citation(s) in RCA: 113] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Altmeier M, Bauer F, Bisplinghoff J, Busch M, Busser K, Colberg T, Demirors L, Diehl O, Engelhardt HP, Eversheim PD, Felden O, Gebel R, Glende M, Greiff J, Hinterberger F, Jonas E, Krause H, Lindemann T, Lindlein J, Maier R, Maschuw R, Meinerzhagen A, Prasuhn D, Rohdjess H, Rosendaal D. Excitation functions of the analyzing power in pp--> scattering from 0.45 to 2.5 GeV. PHYSICAL REVIEW LETTERS 2000; 85:1819-1822. [PMID: 10970622 DOI: 10.1103/physrevlett.85.1819] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2000] [Indexed: 05/23/2023]
Abstract
Excitation functions A(N)(p(p),Theta(c.m.)) of the analyzing power in pp--> elastic scattering have been measured with a polarized atomic hydrogen target for projectile momenta p(p) between 1000 and 3300 MeV/ c. The experiment was performed for scattering angles 30 degrees </=Theta(c.m.)</=90 degrees using the recirculating beam of the proton storage ring COSY during acceleration. The resulting excitation functions and angular distributions of high internal consistency have significant impact on the recent phase shift solution SAID SP99, in particular, on the spin triplet phase shifts between 1000 and 1800 MeV, and demonstrate the limited predictive power of single-energy phase shift solutions at these energies.
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Affiliation(s)
- M Altmeier
- Institut fur Strahlen-und Kernphysik, Universitat Bonn, D-53115 Bonn, Germany
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25
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Huhn V, Watzold L, Weber C, Siepe A, Witala H, Glockle W. New attempt to determine the n-n scattering length with the 2H(n, np)n reaction. PHYSICAL REVIEW LETTERS 2000; 85:1190-1193. [PMID: 10991509 DOI: 10.1103/physrevlett.85.1190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2000] [Indexed: 05/23/2023]
Abstract
The n-n final-state interaction (FSI) was investigated via the 2H(n, np)n reaction at 25 MeV, using a geometry which enables the simultaneous observation of n-p quasifree (QFS) scattering. The data were analyzed with Monte Carlo simulations based on rigorous Faddeev calculations with realistic nucleon-nucleon potentials. The value of a(nn) deduced from the absolute yield in the FSI peak is -16.27+/-0. 40 fm while the relative data, normalized in the QFS region, give -16.06+/-0.35 fm. Thus our results differ from the "recommended" value of a(nn) = -18.5+/-0.3 fm by more than 5 standard deviations.
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Affiliation(s)
- V Huhn
- Institut fur Strahlen- und Kernphysik, Universitat Bonn, D-53115 Bonn, Germany
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26
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Nogga A, Kamada H, Glockle W. Modern nuclear force predictions for the alpha particle. PHYSICAL REVIEW LETTERS 2000; 85:944-947. [PMID: 10991445 DOI: 10.1103/physrevlett.85.944] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2000] [Indexed: 05/23/2023]
Abstract
We present new calculations of the alpha particle which are based on the most modern nucleon-nucleon interactions alone and combined with the Tucson-Melbourne or the Urbana IX three-nucleon interaction. Results for the binding energies and some properties of the wave function are given. On that phenomenological level little room is left for the action of a possible four-nucleon force.
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Affiliation(s)
- A Nogga
- Institut fur theoretische Physik II, Ruhr-Universitat Bochum, D-44780 Bochum, Germany
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27
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Navrátil P, Vary JP, Barrett BR. Properties of 12C in the Ab initio nuclear shell model. PHYSICAL REVIEW LETTERS 2000; 84:5728-5731. [PMID: 10991040 DOI: 10.1103/physrevlett.84.5728] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/1999] [Indexed: 05/23/2023]
Abstract
We obtain properties of 12C in the ab initio no-core nuclear shell model. The effective Hamiltonians are derived microscopically from the realistic CD Bonn and the Argonne V8' nucleon-nucleon (NN) potentials as a function of the finite harmonic oscillator basis space. Binding energies, excitation spectra, and electromagnetic properties are presented for model spaces up to 5Planck's over 2piOmega. The favorable comparison with available data is a consequence of the underlying NN interaction rather than a phenomenological fit.
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Affiliation(s)
- P Navrátil
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
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28
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Sakai H, Sekiguchi K, Witala H, Glockle W, Hatano M, Kamada H, Kato H, Maeda Y, Nogga A, Ohnishi T, Okamura H, Sakamoto N, Sakoda S, Satou Y, Suda K, Tamii A, Uesaka T, Wakasa T, Yako K. Precise measurement of dp elastic scattering at 270 MeV and three-nucleon force effects. PHYSICAL REVIEW LETTERS 2000; 84:5288-5291. [PMID: 10990925 DOI: 10.1103/physrevlett.84.5288] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2000] [Indexed: 05/23/2023]
Abstract
The cross section, the deuteron vector A(d)(y) and tensor analyzing powers A(ij), the polarization transfer coefficients K(y('))(ij), and the induced polarization P(y(')) were measured for the dp elastic scattering at 270 MeV. The cross section and A(d)(y) are well reproduced by Faddeev calculations with modern data-equivalent nucleon-nucleon forces plus the Tucson-Melbourne three-nucleon force. In contrast, A(ij), K(y('))(ij), or P(y(')) are not described by such calculations. These facts indicate the deficiencies in the spin dependence of the Tucson-Melbourne force and call for extended three-nucleon force models.
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Affiliation(s)
- H Sakai
- Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan and The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
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29
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Bieber R, Glockle W, Golak J, Harakeh MN, Huber D, Huisman H, Kalantar-Nayestanaki N, Kamada H, Messchendorp JG, Nogga A, Sakai H, Sakamoto N, Seip M, Volkerts M, Witala H. Three-nucleon force and the A(y) puzzle in intermediate energy p--> + d and d--> + p elastic scattering. PHYSICAL REVIEW LETTERS 2000; 84:606-609. [PMID: 11017327 DOI: 10.1103/physrevlett.84.606] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/1999] [Indexed: 05/23/2023]
Abstract
New vector analyzing-power data on p-->+d elastic scattering at E(p) = 150 and 190 MeV have been measured. These are presented together with existing data and with recent d-->+p vector and tensor analyzing power data at E(d) = 270 MeV. The strong negative extremum of both vector analyzing powers A(p)(y) and A(d)(y) at straight theta(c.m.) approximately 80 degrees -120 degrees is underestimated by Faddeev calculations using modern NN forces. Inclusion of the Tucson-Melbourne 3N force shifts the minima upwards, but with conflicting results for A(p)(y), and leading to a good description for A(d)(y). An A(p)(y) puzzle, previously thought to exist at energies E(N)</=30 MeV only, appears to exist also at intermediate energies.
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Affiliation(s)
- R Bieber
- Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, The Netherlands
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30
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Navrátil P, Barrett BR. No-core shell-model calculations with starting-energy-independent multivalued effective interactions. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1996; 54:2986-2995. [PMID: 9971671 DOI: 10.1103/physrevc.54.2986] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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