Measurement of Inverse Pion Photoproduction at Energies Spanning the N(1440) Resonance

A. Shafi; S. Prakhov; I. I. Strakovsky; W. J. Briscoe; B. M. K. Nefkens; C. E. Allgower; R. A. Arndt; V. Bekrenev; C. Bennhold; M. Clajus; J. R. Comfort; K. Craig; D. Grosnick; D. Isenhower; N. Knecht; D. D. Koetke; A. Kulbardis; N. Kozlenko; S. Kruglov; G. Lolos; I. Lopatin; D. M. Manley; R. Manweiler; A. Marusic; S. McDonald; J. Olmsted; Z. Papandreou; D. Peaslee; N. Phaisangittisaku; J. W. Price; A. F. Ramirez; M. Sadler; H. Spinka; T. D. S. Stanislaus; A. Starostin; H. M. Staudenmaier; I. Supek; W. B. Tippens; R. L. Workman

doi:10.1103/physrevc.70.035204

Home/Archive/arXiv

arXiv · nucl-ex/0405026

Measurement of Inverse Pion Photoproduction at Energies Spanning the N(1440) Resonance

View original source ↗Read source document ↗Export metadata ↓

Abstract

Differential cross sections for the process pi^- p -> gamma n have been measured at Brookhaven National Laboratory's Alternating Gradient Synchrotron with the Crystal Ball multiphoton spectrometer. Measurements were made at 18 pion momenta from 238 to 748 MeV/c, corresponding to E_gamma for the inverse reaction from 285 to 769 MeV. The data have been used to evaluate the gamma n multipoles in the vicinity of the N(1440) resonance. We compare our data and multipoles to previous determinations. A new three-parameter SAID fit yields 36 +/- 7 (GeV)^-1/2 X 10^-3 for the A^n_1/2 amplitude of the P_11.

Explore related subjects

nucl-ex

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

A. Shafi, S. Prakhov, I. I. Strakovsky, W. J. Briscoe, B. M. K. Nefkens, C. E. Allgower, R. A. Arndt, V. Bekrenev, C. Bennhold, M. Clajus, J. R. Comfort, K. Craig, D. Grosnick, D. Isenhower, N. Knecht, D. D. Koetke, A. Kulbardis, N. Kozlenko, S. Kruglov, G. Lolos, I. Lopatin, D. M. Manley, R. Manweiler, A. Marusic, S. McDonald, J. Olmsted, Z. Papandreou, D. Peaslee, N. Phaisangittisaku, J. W. Price, A. F. Ramirez, M. Sadler, H. Spinka, T. D. S. Stanislaus, A. Starostin, H. M. Staudenmaier, I. Supek, W. B. Tippens, R. L. Workman. 2004-05-25. Measurement of Inverse Pion Photoproduction at Energies Spanning the N(1440) Resonance. https://doi.org/10.1103/physrevc.70.035204

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Neutron Optical Constraints on Exotic Parity-odd Interactions between Neutrons and Nucleons

Many theories beyond the standard model of particle physics predict the existence of weakly-coupled exotic spin-dependent interactions between standard model particles. We use experimental upper bounds on neutron-nucleus parity violation at meV and keV neutron energies in the forward scattering limit described by neutron optics to constrain exotic parity-odd interactions of the neutron with nucleons from exotic vector boson exchange for force ranges between $10^{-2}$ to $10^{-14}$ meters.

nucl-ex↗

arXiv2026

Sizeable mixing between the coexisting normal and intruder structures of $^{96}$Zr revealed through lifetime measurements

Lifetimes of excited states of the nucleus $^{96}$Zr were studied with the Doppler-shift attenuation method following the $^{94}$Zr($^{18}$O,$^{16}$O)$^{96}$Zr two-neutron transfer reaction. The obtained $B(E2;2^+_2\to0^+_2)$ and $B(E2;4^+_1\to2^+_2)$ transition strengths, amounting to $26(2)$ and $39(7)$\,W.u., respectively, firmly attribute the $2^+_2$ and $4^+_1$ states to the collective intruder band built on top of the $0^+_2$ state. The nature of this structure is discussed against predictions of the collective model using the Bohr Hamiltonian, the interacting boson model with configuration mixing, and the quasiparticle vacua shell model. The collective, interband $B(E2;4^+_1\to2^+_1)=11.2(8)$\,W.u. transition strength, refuting the previously assumed purity of both structures, is reproduced in the calculations. The quasiparticle vacua shell model predicts, in agreement with a simple two-state model based on experimental $E2$ transition strengths, considerable mixing between the normal and intruder $2^+$ states.

nucl-ex↗

arXiv2026

Search for $^4\overline{\mathrm{Li}}$ from $\overline{\mathrm{p}}+{}^3\overline{\mathrm{He}}$ femtoscopy in Pb-Pb collisions at $\sqrt{s_\mathrm{NN}} =5.36$ TeV with ALICE

In these proceedings, the search for $^4\overline{\mathrm{Li}}$ in Pb-Pb collisions with ALICE is presented. The particle is reconstructed via its two-body decay channel $^4\overline{\mathrm{Li}} \rightarrow \overline{\mathrm{p}} + {}^3\overline{\mathrm{He}}$, using femtoscopic correlations. A dedicated analysis procedure has been developed to subtract the correlated and uncorrelated $\overline{\mathrm{p}} + ^3\overline{\mathrm{He}}$ combinatorial background. The production yield of $^4\overline{\mathrm{Li}}$ is compared with that of $^4\overline{\mathrm{He}}$. Owing to the presence of several $^4\mathrm{Li}$ resonances and their spin degeneracy, the production of $^4\overline{\mathrm{Li}}$ is expected to be enhanced with respect to the compact $^4\overline{\mathrm{He}}$, making this new measurement a sensitive probe for testing nucleosynthesis models in high-energy hadronic collisions.

nucl-ex↗