Mass measurements in the vicinity of the doubly-magic waiting point 56Ni

Abstract

Masses of 56,57Fe, 53Co^m, 53,56Co, 55,56,57Ni, 57,58Cu, and 59,60Zn have been determined with the JYFLTRAP Penning trap mass spectrometer at IGISOL with a precision of dm/m \le 3 x 10^{-8}. The QEC values for 53Co, 55Ni, 56Ni, 57Cu, 58Cu, and 59Zn have been measured directly with a typical precision of better than 0.7 keV and Coulomb displacement energies have been determined. The Q values for proton captures on 55Co, 56Ni, 58Cu, and 59Cu have been measured directly. The precision of the proton-capture Q value for 56Ni(p,gamma)57Cu, Q(p,gamma) = 689.69(51) keV, crucial for astrophysical rp-process calculations, has been improved by a factor of 37. The excitation energy of the proton emitting spin-gap isomer 53Co^m has been measured precisely, Ex = 3174.3(10) keV, and a Coulomb energy difference of 133.9(10) keV for the 19/2- state has been obtained. Except for 53Co, the mass values have been adjusted within a network of 17 frequency ratio measurements between 13 nuclides which allowed also a determination of the reference masses 55Co, 58Ni, and 59Cu.

14 pages, 13 figures, submitted to Phys. Rev. C

References in corpus (7)

• The Ramsey method in high-precision mass spectrometry with Penning traps: Experimental results
• Q value of the 100Mo Double-Beta Decay
• High-precision mass measurements of nickel, copper, and gallium isotopes and the purported shell closure at N=40
• Determination of |Vud| from nuclear mirror transitions
• Mass measurements in the vicinity of the rp-process and the nu p-process paths with JYFLTRAP and SHIPTRAP
• Ft values of the T = 1/2 mirror beta transitions
• Q_EC values of the Superallowed beta Emitters 50Mn and 54Co

Cited by in corpus (8)

• Nucleosynthesis in Type I X-ray Bursts
• Isochronous mass measurements of $T_z=-1$ $fp$-shell nuclei from projectile fragmentation of ${}^{58}$Ni
• High-precision mass measurement of ${}^{56}$Cu and the redirection of the rp-process flow
• Penning-Trap Mass Measurements of the Neutron-Rich K and Ca Isotopes: Resurgence of the N = 28 Shell Strength
• Low-lying level structure of ${}^{56}$Cu and its implications on the rp process
• Coulomb displacement energies as a probe for nucleon pairing in the $f_{7/2}$ shell
• ${}^{57}$Zn $\beta$-delayed proton emission establishes the ${}^{56}$Ni $rp$-process waiting point bypass
• The light curve in supernova modeled by a continuous radioactive decay of ${}^{56}$Ni