Restoration of the natural E(1/21+) – E(3/21+) energy splitting in odd-K isotopes towards N = 40

Restoration of the natural E(1/2₁⁺) – E(3/2₁⁺) energy splitting in odd-K isotopes towards N = 40

FOLYÓIRAT PUBLIKÁCIÓ

Sun, Y.L. ; Obertelli, A. ; Doornenbal, P. ; Barbieri, C. ; Chazono, Y. ; Duguet, T. ; Liu, H.N. ; Navrátil, P. ; Nowacki, F. ; Ogata, K. et al.

Restoration of the natural E(1/2 1 + ) – E(3/2 1 + ) energy splitting in odd-K isotopes towards N = 40

PHYSICS LETTERS B 802 Paper: 135215 , 7 p. (2020)

DOI: 10.1016/j.physletb.2020.135215

Published: 10 March 2020

Abstract

We report on the first γ-ray spectroscopy of ^51,53K produced via the ^52,54Ca(p,2p) reactions at ∼250 MeV/nucleon. Unambiguous final-state angular-momentum assignments were achieved for beam intensities down to few particles per second by using a new technique based on reaction vertex tracking combined with a thick liquid-hydrogen target. Through γ-ray spectroscopy and exclusive parallel momentum distribution analysis, 3/2⁺ ground states and 1/2⁺ first excited states in ^51,53K were established quantifying the natural ordering of the $1 d_{3 / 2}$ and $2 s_{1 / 2}$ proton-hole states that are restored at N = 32 and 34. State-of-the-art ab initiocalculations and shell-model calculations with improved phenomenological effective interactions reproduce the present data and predict consistently the increase of the E(1/2 $_{1}^{+}$ ) – E(3/2 $_{1}^{+}$ ) energy differences towards N = 40.

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