Isochronous mass measurements of $T_z=-1$ $fp$-shell nuclei from projectile fragmentation of ${}^{58}$Ni

Abstract

Atomic masses of seven $T_z=-1$, $fp$-shell nuclei from ${}^{44}$V to ${}^{56}$Cu and two low-lying isomers, ${}^{44m}$V ($J^{\pi }=6^{+}$) and ${}^{52m}$Co ($J^{\pi }=2^{+}$), have been measured with relative precisions of $1-4\times 10^{-7}$ with Isochronous Mass Spectrometry (IMS) at CSRe. The masses of ${}^{56}$Cu, ${}^{52g,52m}$Co, and ${}^{44m}$V were measured for the first time in this experiment. The Mass Excesses ($M{E}^{\prime }$s) of ${}^{44}$V, ${}^{48}$Mn, ${}^{50}$Fe, and ${}^{54}$Ni are determined with an order of magnitude improved precision compared to the literature values. ${}^{52g,52m}$Co and ${}^{56}$Cu are found to be $370$~keV and $400$~keV more bound, respectively, while ${}^{44g,44m}$V are $\sim 300$~keV less bound than the extrapolations in the Atomic-Mass Evaluation 2012 (AME${}^{\prime }$12). The masses of the four $T_z=-1/2$ nuclei ${}^{45}$V, ${}^{47}$Cr, ${}^{49}$Mn, and ${}^{51}$Fe are re-determined to be in agreement, within the experimental errors, with the recent JYFLTRAP measurements or with the previous IMS measurements in CSRe. Details of the measurements and data analysis are described, and the impact of the new $ME$ values on different aspects in nuclear structure are investigated and discussed.

16 pages, 15 figures

References in corpus (22)

• Microscopic mass formulae
• Surface diffuseness correction in global mass formula
• Further improvements on a global nuclear mass model
• X-ray binaries
• Nuclear mass predictions with radial basis function approach
• First Results from the CARIBU Facility: Mass Measurements on the r-Process Path
• Variation in displacement energies due to isospin nonconserving forces
• The Impact of Uncertainties in Reaction Q-values on Nucleosynthesis in Type I X-Ray Bursts
• Evaluated Experimental Isobaric Analogue States from $T=1/2$ to $T=3$ and associated IMME coefficients
• Storage ring mass spectrometry for nuclear structure and astrophysics research
• Isobaric Multiplet Mass Equation for $A\le 71$ Revisited
• Isospin Non-Conservation in $sd$-Shell Nuclei
• Identification of the Lowest $T=2$, $J^{\pi =}{0}^{+}$ Isobaric Analog State in ${}^{52}$Co and Its Impact on the Understanding of $\beta$-Decay Properties of ${}^{52}$Ni
• Mass measurements in the vicinity of the doubly-magic waiting point 56Ni
• Observation of the $\beta$-delayed $\gamma$-proton decay of ${}^{56}$Zn and its impact on the Gamow Teller strength evaluation
• Detailed illustration of accuracy of presently used nuclear-mass models
• Extraction of the symmetry energy coefficients from the masses differences of isobaric nuclei
• Beta decay of the exotic $T_z$ = -2 nuclei ${}^{48}$Fe, ${}^{52}$Ni and ${}^{56}$Zn
• High-precision mass measurement of ${}^{56}$Cu and the redirection of the rp-process flow
• High-precision mass measurements for the isobaric multiplet mass equation at A = 52
• Theoretical corrections and world data for the superallowed ft values in the beta decays of 42Ti, 46Cr, 50Fe and 54Ni
• Coulomb displacement energies as a probe for nucleon pairing in the $f_{7/2}$ shell

Cited by in corpus (17)

• Nuclear mass predictions with machine learning reaching the accuracy required by $r$-process studies
• Mass measurements of As, Se and Br nuclei and their implication on the proton-neutron interaction strength towards the N=Z line
• Masses of neutron-rich ${}^{52-54}$Sc and ${}^{54,56}$Ti nuclides: The $N=32$ subshell closure in scandium
• $B\rho$-defined Isochronous Mass Spectrometry and Mass Measurements of ${}^{58}$Ni Fragments
• $B\rho$-defined isochronous mass spectrometry: a new approach for high-precision mass measurements of short-lived nuclei
• Particle identification and revolution time corrections for the isochronous mass spectrometry in storage rings
• Characterization of a double Time-Of-Flight detector system for accurate velocity measurement in a storage ring using laser beams
• Masses of ground and isomeric states of ${}^{101}$In and configuration-dependent shell evolution in odd-$A$ indium isotopes
• Isobaric Multiplet Mass Equation within nuclear Density Functional Theory
• Charge resolution in the isochronous mass spectrometry and the mass of ${}^{51}$Co
• Development and operation of an electrostatic time-of-flight detector for the Rare RI storage Ring
• Mass measurements for $T_z=-2$ $fp$-shell nuclei ${}^{40}$Ti, ${}^{44}$Cr, ${}^{46}$Mn, ${}^{48}$Fe, ${}^{50}$Co and ${}^{52}$Ni
• The Regulated NiCu Cycles with the new ${}^{57}$Cu(p,$\gamma$)${}^{58}$Zn reaction rate and the Influence on Type-I X-Ray Bursts: GS 1826$-$24 Clocked Burster
• High precision mass measurements of the isomeric and ground states of ${}^{44}$V: improving constraints on the IMME parameters of the A=44, ${\text{0}}^{\text{+}}$ quintet
• Improving the resolving power of Isochronous Mass Spectrometry by employing an in-ring mechanical slit
• AMC 12 atomic mass compilation data extrapolated for atomic masses of nuclei far from the valley of stability
• Identification and online monitoring of experimental measurement states via Cuscore statistic