A detailed view at magnetic dipole strengths: The case of semi-magic ${}^{50}$Ti

Abstract

Magnetic dipole, $M1$, strengths were studied in semi-magic ${}^{50}$Ti up to the neutron-separation threshold by combining data from $(d,p)$ one-neutron transfer, $(\gamma ,{\gamma }^{\prime })$ real-photon scattering, $(e,e^{\prime })$ inelastic scattering at extreme backward angles, and $(p,p^{\prime })$ at $E_p=210$ MeV and extreme forward angles. The combination of all probes provided unique access to the neutron spin-flip contribution and the possibility to evaluate its role in generating the spin-flip $M1$ strengths. The small contribution of the neutron $(1f_{7/2}{)}^{-1}(1f_{5/2}{)}^{+1}$ spin-flip transitions, which were probed with the $(d,p)$ reaction, to the overall strength in ${}^{50}$Ti questions the standard picture for the microscopic origin of spin-flip strength in the $fp$ shell. For ${}^{50}$Ti, this letter shows that $J^{\pi }=1^{+}$ states with larger neutron $(1f_{7/2}{)}^{-1}(1f_{5/2}{)}^{+1}$ spectroscopic factors do not correspond to the ones with the largest $B(M1;0_1^{+}\to 1_i^{+})$ strengths.

arXiv comment7 pages, 3 figures, published in Physical Review Letters

References in corpus (19)

• Discrepancy between experimental and theoretical $\beta$-decay rates resolved from first principles
• Magnetic dipole excitations in nuclei: elementary modes of nucleonic motion
• Supernova Inelastic Neutrino-Nucleus Cross Sections from High-Resolution Electron Scattering Experiments and Shell-Model Calculations
• Three-nucleon forces and spectroscopy of neutron-rich calcium isotopes
• Effects of three-nucleon forces and two-body currents on Gamow-Teller strengths
• The high-efficiency γ-ray spectroscopy setup γ3 at HIγS
• Gamow-Teller strength in ${}^{48}$Ca and ${}^{78}$Ni with the charge-exchange subtracted second random-phase approximation
• Electromagnetic M1 transition strengths from inelastic proton scattering: The cases of 48Ca and 208Pb
• Evolution of the N=20 and 28 Shell Gaps and 2-particle-2-hole states in the FSU Interaction
• Toward an accurate strongly-coupled many-body theory within the equation of motion framework
• Impact of two-body currents on magnetic dipole moments of nuclei
• Structure of ${}^{38}$Cl and the quest for a comprehensive shell model interaction
• Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in ${}^{208}$Pb
• Quenching of Single-Particle Strength in A=15 Nuclei
• Microscopic response theory for strongly-coupled superfluid fermionic systems
• Quenching of Gamow-Teller strengths and two particle -- two hole configurations
• Experimental study of excited states of ${}^{62}$Ni via one-neutron $(d,p)$ transfer up to the neutron-separation threshold and characteristics of the pygmy dipole resonance states
• Magnetic dipole transition in ${}^{48}$Ca
• Nuclear structure and direct reaction studies in particle-$\gamma$ coincidence experiments at the FSU John D. Fox Superconducting Linear Accelerator Laboratory