Precise Measurement of Short-Range Correlations in Nuclei from Bremsstrahlung Gamma Ray Emission in Low-Energy Heavy-Ion Collisions

Abstract

Atomic nuclei and dense nucleonic matter in neutron stars exhibit short-range correlations (SRCs), where nucleons form temporally correlated pairs in proximity beyond mean-field approximation. It is essential to make precision measurement of the fraction of SRC since it carries the signature of underlying quark dynamics in nuclear medium. In this letter, we present the first high-precision measurement of neutron-proton bremsstrahlung $\gamma$-ray emission from the symmetric ${}^{124}\mathrm{Sn}$+${}^{124}\mathrm{Sn}$ reactions at 25 MeV/u. From the observed spectral hardening, the precise SRC fraction in the ${}^{124}\mathrm{Sn}$ nucleus is extracted to be $(20\pm 3)\%$. This result provides a novel, direct and unambiguous evidence of SRCs, and demonstrates that low-energy heavy-ion collisions offers a new approach to studying nuclear structure in connection with quark-level dynamics.

References in corpus (41)

• Self-consistent Green's function method for nuclei and nuclear matter
• Probing Cold Dense Nuclear Matter
• Nucleon-Nucleon Correlations, Short-lived Excitations, and the Quarks Within
• Momentum sharing in imbalanced Fermi systems
• Realistic Model of the Nucleon Spectral Function in Few- and Many- Nucleon Systems
• Evidence for the Strong Dominance of Proton-Neutron Correlations in Nuclei
• Momentum dependence of symmetry potential in asymmetric nuclear matter for transport model calculations
• Equation of state of asymmetric nuclear matter and collisions of neutron-rich nuclei
• Short Range Correlations and the EMC Effect
• Effects of momentum-dependent symmetry potential on heavy-ion collisions induced by neutron-rich nuclei
• Nucleon Effective Masses in Neutron-Rich Matter
• Investigation of Proton-Proton Short-Range Correlations via the 12C(e,e'pp) Reaction
• Modified Structure of Protons and Neutrons in Correlated Pairs
• n-p Short-Range Correlations from (p,2p + n) Measurements
• Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the 4He(e,e'pN) Triple-Coincidence Reaction
• The Challenge of the EMC Effect: existing data and future directions
• Symmetry Energy of Nucleonic Matter With Tensor Correlations
• Isospin dependence of collective flow in heavy-ion collisions at intermediate energies
• New data strengthen the connection between Short Range Correlations and the EMC effect
• Generalized nuclear contacts and the nucleon's momentum distributions
• Depletion of the nuclear Fermi sea
• Scale and Scheme Independence and Position-Momentum Equivalence of Nuclear Short-Range Correlations
• Symmetry energy of cold nucleonic matter within a relativistic mean field model encapsulating effects of high momentum nucleons induced by short-range correlations
• Why is the nuclear symmetry energy so uncertain at supra-saturation densities?
• Correlated Fermion Pairs in Nuclei and Ultracold Atomic Gases
• Unperturbed inverse kinematics nucleon knockout measurements with a 48 GeV/c carbon beam
• Three-body force effect on nucleon momentum distributions in asymmetric nuclear matter within the framework of the extended BHF approach
• The isospin quartic term in the kinetic energy of neutron-rich nucleonic matter
• Imprints of high-momentum nucleons in nuclei on hard photons from heavy-ion collisions around the Fermi Energy
• CSHINE for studies of HBT correlation in Heavy Ion Reactions
• Isospin composition of the high-momentum fluctuations in nuclei from asymptotic momentum distributions
• Delineating effects of tensor force on the density dependence of nuclear symmetry energy
• Track Recognition for the $\Delta E-E$ Telescopes with Silicon Strip Detectors
• Short-Range Correlations and Urca Process in Neutron Stars
• Observing the Ping-pong Modality of Isospin Degree of Freedom in Cluster Emission from Heavy Ion Reactions
• A CsI hodoscope on CSHINE for Bremsstrahlung γ-rays in Heavy Ion Reactions
• Reconstruction of Bremsstrahlung $\gamma$-rays Spectrum in Heavy Ion Reactions with Richardson-Lucy Algorithm
• Photon production in heavy-ion collisions close to the pion threshold
• The neutron array of the compact spectrometer for heavy ion experiments in Fermi energy region
• Proton-proton momentum correlation function as a probe of the high momentum tail of the nucleon momentum distribution
• Linear Response of CsI(Tl) Crystal to Energetic Photons below 20 MeV

Cited by in corpus (3)

• Nucleon Short-Range Correlations and High-Momentum Dynamics: Implications on the Equation of State of Dense Matter
• Experimental Study of Bremsstrahlung Gamma Ray Emission and Short-Range Correlations in ${}^{124}$Sn+${}^{124}$Sn Collisions at 25 MeV/u
• Neutron Star Equation of State with Nucleon Short-Range Correlations: A Concise Review and Open Issues