Intruder features in the island of inversion: The case of33Mg

Abstract

Intruder features in the island of inversion : The 33Mg case. Physical Review C, 64(5), Article 054313.

Strongly coupled rotational band in Mg33

“…The 220, 483, and 703 keV transitions correspond to γ-rays known and placed from previous work [7,[20][21][22][23][24]. The 483 keV γ-ray was placed as a transition directly to the tentative 3/2 − ground state [11], as was the 703 keV γ-ray [7,21]. The 220 keV has been established to be in coincidence with the 483 keV transition [21], depopulating the 703 keV state.…”

“…The 220 keV has been established to be in coincidence with the 483 keV transition [21], depopulating the 703 keV state. The 297 keV γ-ray was previously reported [21], but was not placed in the level scheme. In this work, the 297 keV was observed strongly and shown to be in coincidence with the 483 keV line through a γ − γ analysis, as shown in the lower panel of Figure 2.…”

“…The 483 keV γ-ray was placed as a transition directly to the tentative 3/2 − ground state [11], as was the 703 keV γ-ray [7,21]. The 220 keV has been established to be in coincidence with the 483 keV transition [21], depopulating the 703 keV state. The 297 keV γ-ray was previously reported [21], but was not placed in the level scheme.…”

Direct experimental evidence for a multiparticle-hole ground state configuration of deformedMg33

“…The observation of the breakdown of traditional magic numbers [1] in exotic nuclei far from the β-stability line has been an important issue in nuclear structure physics and significant effort has been put into both experimental investigations [2][3][4][5][6][7][8][9][10][11][12] and theoretical studies [13][14][15][16]. The first observation of the disappearance of the so-called magic number was reported by Thibault et al [2], based on mass measurements of the neutron-rich 31,32 Na isotopes [2].…”

“…Many different experiments [3,6,[8][9][10][11][12] have been performed to unravel the structure of 33 Mg (N = 21) but until now neither the ground state parity nor the shell configuration has been confirmed. From the measured negative sign of the magnetic moment, a pure 3p-2h ground state configuration and 3/2 − ground state spin and parity were suggested [10].…”