N. Larson

Proton spectroscopy of Ni 48, Fe 46, and Cr 44

Results of decay spectroscopy on nuclei in vicinity of the doubly magic 48Ni are presented. The measurements were performed with a Time Projection Chamber with optical readout which records tracks of ions and protons in the gaseous volume. Six decays of 48Ni including four events of two-proton ground-state radioactivity were recorded. An advanced reconstruction procedure yielded the 2p decay energy for 48Ni of Q2p = 1.29(4) MeV. In addition, the energy spectra of \b{eta}-delayed protons emitted in the decays of 44Cr and 46Fe, as well as half-lives and branching ratios were determined. The results were found to be consistent with the previous measurements made with Si detectors. A new proton line in the decay of 44Cr corresponding to the decay energy of 760 keV is reported. The first evidence for the \b{eta}2p decay of 46 Fe, based on one clear event, is shown.

Low-energy structure of 2766Co 39 and 2768Co 41 populated through β decay

The low-energy level structures for the neutron-rich Co isotopes at N = 39 and N = 41 are constructed following the beta decay of the respective even-even Fe isotopes. Spin and parity assignments of the lowest energy populated state in {sup 66}Co and {sup 68}Co are consistent with a 1{sup +} spin and parity assignment and attributed to the coupling of the deformed proton configurations identified in {sup 67}Co and deformed neutron configurations inferred from neighboring Fe isotones. Comparisons along the N = 39 and N = 41 isotonic chains reveal a similarity in the structures of the Co and Mn isotopes.

Isobaric multiplet mass equation in the A = 31 , T = 3 / 2 quartets

The observed mass excesses of analog nuclear states with the same mass number

Isospin Mixing Reveals P 30 (p,γ) S 31 Resonance Influencing Nova Nucleosynthesis

A

Proton spectroscopy of 48Ni, 46Fe, and 44Cr

and isospin

Proton spectroscopy of Ni48,Fe46 , and Cr44

T

Isospin mixing reveals 30P(p, γ)31S resonance influencing nova nucleosynthesis

can be used to test the isobaric multiplet mass equation (IMME), which has, in most cases, been validated to a high degree of precision. A recent measurement [Kankainen et al., Phys. Rev. C 93 041304(R) (2016)] of the ground-state mass of

Proton spectroscopy ofNi48,Fe46, andCr44

^{31}

Low-energy structure of Co-66(27)39 and Co-68(27)41 populated through beta decay

Cl led to a substantial breakdown of the IMME for the lowest

Low-energy structure of2766Co39and2768Co41populated throughβdecay

A = 31, T = 3/2