Coulomb displacement energies as a probe for nucleon pairing in the $f_{7/2}$ shell

Abstract

Coulomb displacement energies of $T=1/2$ mirror nuclei have been studied via a series of high-precision $Q_{\mathrm{EC}}$-value measurements with the double Penning trap mass spectrometer JYFLTRAP. Most recently, the $Q_{\mathrm{EC}}$ values of the $f_{7/2}$-shell mirror nuclei ${}^{45}$V ($Q_{\mathrm{EC}}=7123.82(22)$ keV) and ${}^{49}$Mn ($Q_{\mathrm{EC}}=7712.42(24)$ keV) have been measured with an unprecedented precision. The data reveal a 16-keV ($1.6\sigma$) offset in the adopted Atomic Mass Evaluation 2012 value of ${}^{49}$Mn suggesting the need for further measurements to verify the breakdown of the quadratic form of the isobaric multiplet mass equation. Precisely measured $Q_{\mathrm{EC}}$ values confirm that the pairing effect in the Coulomb energies is quenched when entering the $f_{7/2}$ shell and reaches a minimum in the midshell.

arXiv comment5 pages, 5 figures, submitted to Phys. Rev. C

References in corpus (13)

• Nuclear Ground-State Masses and Deformations
• The Ramsey method in high-precision mass spectrometry with Penning traps: Experimental results
• Isobaric multiplet yrast energies and isospin non-conserving forces
• A sextupole ion beam guide to improve the efficiency and beam quality at IGISOL
• Determination of |Vud| from nuclear mirror transitions
• Full pf shell study of A = 47 and A = 49 nuclei
• Ft values of the T = 1/2 mirror beta transitions
• Variation in displacement energies due to isospin nonconserving forces
• Evaluated Experimental Isobaric Analogue States from $T=1/2$ to $T=3$ and associated IMME coefficients
• Isospin-breaking corrections to superallowed Fermi beta-decay in isospin- and angular-momentum-projected nuclear Density Functional Theory
• Isomeric states close to doubly magic ${}^{132}$Sn studied with JYFLTRAP
• Mass measurements in the vicinity of the doubly-magic waiting point 56Ni
• Mirror Energy Differences and nuclear structure in 1$f_{7/2}$ nuclei

Cited by in corpus (2)

• Isochronous mass measurements of $T_z=-1$ $fp$-shell nuclei from projectile fragmentation of ${}^{58}$Ni
• $\mathcal{F}t$ values of the mirror $\beta$ transitions and the weak magnetism induced current in allowed nuclear $\beta$ decay