Cover of: Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange | LAMPF International Workshop on Pion-Nucleus Double Charge Exchange (2nd 1989 Los Alamos, N.M.)

Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange

August 9-11, 1989, Los Alamos, USA
  • 606 Pages
  • 0.51 MB
  • English
World Scientific , Singapore, Teaneck, N.J
Pion double charge exchange -- Congresses., Nucleon-nucleon interactions -- Congresses., Nuclear structure -- Congre
Other titlesPion-nucleus double charge exchange.
Statementeditors, W.R. Gibbs, M.J. Leitch.
ContributionsGibbs, William R., Leitch, M. J.
LC ClassificationsQC793.5.M428 L36 1989
The Physical Object
Paginationxiii, 606 p. :
ID Numbers
Open LibraryOL1882178M
ISBN 109810201486
LC Control Number90042895

Get this from a library. Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange: August, Los Alamos, USA. [William R Gibbs; M J Leitch;].

Description Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange PDF

Quick Search in Books. Enter words / phrases / DOI / ISBN / keywords / authors / etc. Search Search. Pion-Nucleus Double Charge Exchange. Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange, Los Alamos, USA, 9 – 11 August Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange, August, Los Alamos, USA editors, W.R.

Gibbs, M.J. Leitch World Scientific, c This thesis discusses the pion double charge exchange (DCX) reaction ¹⁸0(π⁺,π⁻)¹⁸Ne at 50 MeV. Transitions to the ground state of ¹⁸Ne, which is the double-isobaric-analogue state (DIAS) of ¹⁸0, have been isolated.

The differential cross sections for DIAS transitions have been measured at 6 scattering angles from ° to °. The experiment was performed at TRIUMF in. The double-charge-exchange reaction yielded a secondary pion energy distribution, the features of which can be due to either a three-nucleon resonance or a resonace of the nucleons in the 3He nucleus.

Single- and double-charge-exchange reactions of pions on nuclei are analyzed by means of an elementary model based on the first- and second-order impulse approximations.

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The model is applied to the description of transitions induced between the isobaric analog states of 14 C and 14 O and 14 N at 50 MeV incident pion energy. Abstract.

The first discussions 1 of pion double charge exchange (DCX) dating back to the early ’s mention already the great potential of this reaction to study nuclei far from the line of stability.

Early attempts by Gilly et al., at CERN failed because of the low pion intensities available at that time. The situation changed with the advent of high intensity pion beams at the ‘meson.

Details Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange FB2

In this contribution we present a study of a direct and sequential two-nucleon transfer within the microscopic Interacting Boson Model (IBM-2) and Interacting Boson- Fermion Model (IBFM), respectively.

We present our preliminary results for heavy-ion double-charge-exchange 40 Ca(18 O, 18 Ne) 40 Ar G.S. > differential cross section too. The doubly differential cross sections for the 4 He(π +,π -)4p reaction were calculated using both a two-nucleon sequential single charge exchange model and an intranuclear cascade code.

Final state interactions between the two final protons which were the initial neutrons were included in both methods. At incident pion energies of and MeV the low-energy peak observed. LAMPF Workshop on Pion Double Charge Exchange, eds. Baer, H.W., Leitch, M.J.

Los Alamos National Laboratory Report, LAC (), p. Google Scholar The method is described in [30], where it is shown that a realistic π- 18 O optical potential can be constructed from the knowledge of the π- 16 O optical potential. The two-nucleon pion absorption-emission mechanism 1) and its contribution to the pioni-induced double-charge-exchange (DCX) reaction at energies T π ⩽ MeV is studied.

By combiing this new mechanism with the conventional sequential mechanism, the 0° excitation functions for the DCX reactions to the isobaric analog states on the 14 C, 18 O, 26 Mg, and 42 Ca are calculated and.

Introduction The pion double-charge-exchange (DCX) reaction is one of the most intriguing subjects in the studies of pion-nucleus interactions, especially at low energies 1).

Around 50 MeV incident energy, due to the cancellation of the s- and p-wave amplitudes the forward differential cross section for pion-nucleon charge-exchange scattering. Proc. LAMPF Workshop on Pion Double Charge Exchange H.W. Baer and M.J. Leitch, eds., Los Alamos, New Mexico, USA, () Los Alamos National Laboratory Report No.

LA Google Scholar. Proc. Second LAMPF Workshop on Pion-Nucleus Double Charge Exchange, W.R. Gibbs and M.J. Leitch, eds eBook Packages Springer Book Archive; Buy this book.

"Double Collective Excitations", Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange, Los Alamos, NM.

"Observation of Double Giant Dipole Resonances in Pion Double Charge Exchange", International Nuclear Physics Conference, Sao. Pion–Nucleus Double Charge Exchange, Proc. of the Second LAMPF Workshop on Pion–Nucleus Double Charge Exchange, Los Alamos, New Mexico, USA, World Scientific, Singapore (), p.

79 Google Scholar. Pion Double Charge Exchange in Nuclei Pion Double Charge Exchange in Nuclei Johnson, M B; Morris, C L AND EARLY HISTORY In 1events were observed in emulsions exposed at high altitudes that were attributed to the decay of a heavy meson into the previously discovered weakly interacting muon (1).

This new meson was quickly identified as the exchange. The double-exchange mechanism is a type of a magnetic exchange that may arise between ions in different oxidation proposed by Clarence Zener, this theory predicts the relative ease with which an electron may be exchanged between two species and has important implications for whether materials are ferromagnetic, antiferromagnetic, or exhibit spiral magnetism.

The influence of nuclear Fermi motion on the conventional mechanism of pion double charge exchange (DCX) is examined. Concrete calculations of the 0° excitation function over the energy region 0– MeV are performed for the double-isobaric-analog-state (DIAS) DCX transition on 14 C.

The calculated results coincide very well with the experimental data for energies above MeV, but. Abstract. Inclusive double charge exchange (DCX) reaction A(π −, π +) X on 6 Li and 16 O was for the first time measured at incident kinetic energy T 0 = GeV (≈ 5°) for outgoing particle momentum region where additional pion production is kinematically forbidden.

The experiment was performed at secondary π − beam of the ITEP proton synchrotron using the 3m magnet spectrometer. The scaling of the total charge exchange cross section according to eq. (6) is visualized by dividing σtot by the factor A 2/3 Q(Q − 1)/(A − 1) and plotting it as a function of A − Q.

2) J. Matthews, in Proceedings of the LAMPF Workshop on Pion Double Charge Exchange, Los Alamos National Laboratory report LAC (), and in The Second International Workshop on Pion Double Charge Exchange, Los Alamos, NM. Recent data obtained for pion-nucleus interactions above the (triangle)() is presented.

The expected long mean-free path at pion energies above the (3,3) resonance is demonstrated in elastic scattering. Evidence for unexpected nuclear transparency for outgoing pions at resonance energies is presented. A new technique measuring virtual (triangle) components of the nuclear wave function is.

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ORIGINS AND PRESENT STATUS OF LAMPF A. Location. The LAMPF linac and research facility is located on Mesita de Los Alamos, a long, narrow mesa south of the main plateau on which the town of Los Alamos is situated. The top of the mesa is essen-tially level, providing an excellent site for the half-mile-long linear accelerator, with wide and deep.

A phenomenological optical-model analysis of pion elastic scattering and single- and doublecharge-exchange scattering to isobaric-analog states is reviewed. Interpretation of the opticalmodel parameters is briefly discussed, and several applications and extensions are considered. The applications include the study of various nuclear properties, including neutron deformation and surface.

The energy dependence of forward angle pion double charge exchange is calculated in the energy range of MeV. The most striking feature is a peak around 40.

Pion Double Charge Exchange in Nuclei. Figure 4: (a) Expected strain sensitivities of second- and third-generation detectors. (b) Comparison between sensitivities of various experiments with different theoretical models of SGWB.

X-ray binaries, double–neutron star binaries, white dwarf–pulsar binaries, and white dwarf–pulsar. We study theoretically pion double charge exchange reactions leading to double pionic atoms.

The reaction cross-sections with two pions in the deeper bound pionic orbits in Pb are calculated with realistic pionic atom wave functions and distortion effects.

The cross-sections are found to be d 2 σ/dEdΩ~10 −3 −10 −4 µ b/srMeV, which are only a small fraction of the double charge. In the scattering of positive pions by nuclei the double-charge-exchange (DCX) reaction creates the possibility of the formation of pionic atom states in the vicinity of the threshold of the reaction.

New measurements of pion‐nucleus total cross sections have been made at LAMPF and BNL. The results from LAMPF include measurement of the difference of the rms neutron and proton radii of 48 Ca to be ± and that of 18 0 to be ± The BNL measurements provide a new phenomenology on the downshift and spreading of the (3–3) resonance in nuclei from the first data on heavy nuclei.

Dynamics of the nuclear fragmentations and the charge exchange reactions in pion-nucleus collisions near the $Δ$() resonance energies has been investigated within the Lanzhou quantum molecular dynamics (LQMD) transport model. An isospin, momentum and density-dependent pion-nucleon potential is implemented in the model, which influences the pion dynamics, in particular .G.

Kälbermann, J. M. Eisenberg, and B. Svetitsky, Hot nuclear matter with dilatons, Nucl. Phys. A () (nucl-th/). We study hot nuclear matter in a model based on nucleon interactions deriving from the exchange of scalar and vector mesons. The main new feature of our work is the treatment of the scale breaking of quantum chromodynamics through the introduction of a dilaton field.We investigate the behavior of the operator responsible for sequential pion double charge exchange in nuclei in the plane wave limit with a view to studying its extension in space, especially the short-range part.

Publication: Physical Review C. Pub Date: October DOI: /PhysRevC Bibcode.