Identification of the Lowest T=2, Jπ=0+ Isobaric Analog State in Co<mml:mprescripts/><mml:none/>52 and Its Impact on the Understanding of β-Decay Properties of Ni<mml:mprescripts/><mml:none/>52

2016/10/28 by X. Xu, P. Zhang, P. Shuai +46 · 49 citations
Medicine · Physics and Astronomy · #Algorithm #Astronomical and nuclear sciences #Computer science #Nuclear physics research studies #Radiopharmaceutical Chemistry and Applications #nucl-ex

paper · pdf · doi:10.1103/physrevlett.117.182503

published in Physical Review Letters 117(18), 182503 (American Physical Society) · Accepted for publication in PRL. 5 pages, 2figures

openalex publication_date 2016/10/28 · arxiv created 2016/10/31 · arxiv updated 2016/11/01 · openalex created_date 2016/11/04 · openalex updated_date 2026/08/05

Abstract

Masses of ^52g,52mCo were measured for the first time with an accuracy of \ensuremath∼10 keV, an unprecedented precision reached for short-lived nuclei in the isochronous mass spectrometry. Combining our results with the previous \ensuremathβ\text\ensuremath-\ensuremathγ measurements of ⁵²Ni, the T=2, J^\ensuremathπ=0⁺ isobaric analog state (IAS) in ⁵²Co was newly assigned, questioning the conventional identification of IASs from the \ensuremathβ-delayed proton emissions. Using our energy of the IAS in ⁵²Co, the masses of the T=2 multiplet fit well into the isobaric multiplet mass equation. We find that the IAS in ⁵²Co decays predominantly via \ensuremathγ transitions while the proton emission is negligibly small. According to our large-scale shell model calculations, this phenomenon has been interpreted to be due to very low isospin mixing in the IAS.

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