The ν9/2[404] orbital and the deformation in the A ∼ 100 region

Abstract

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. The ν9/2[404] orbital and the deformation in the A ∼ 100 region

Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes

“…[7] and references therein). For the neutrons, the downsloping 1=2 þ ½550 and the 3=2 À ½541 orbitals, both resulting from the spherical h 11=2 orbital, drive the deformation.…”

“…Ref. [7]), where the parameter represents the axially symmetric deformation [8]. On the other hand, for the protons, the downsloping 1=2 þ ½440 and 3=2 þ ½431 orbitals, originating from the spherical g 9=2 orbital, are fully occupied at Z ¼ 38 and Z ¼ 40, again at a deformation parameter of about % 0:4.…”

“…Quantum phase transitions occur in atomic nuclei as a function of the number of protons or neutrons and describe changes of the ground-state shapes [2]. The so-called A % 100 mass region of the nuclear chart around 100 Zr is one of the most popular regions for the study of this phenomenon since the zirconium (Z ¼ 40) and strontium (Z ¼ 38) isotopes undergo a shape transition from almost spherical to strongly deformed shapes when going from neutron number N ¼ 58 to N ¼ 60 [3][4][5][6][7]. This PRL 108, 062701 (2012) P…”

Abrupt shape transition at neutron number N=60 : B(E2) values in SrRégis1, Jolie2, Saed-Samii3 et al. 2017Phys. Rev. CSelf Cite342270View full textAdd to dashboardCite

“…In a spherical shell-model approach, this phenomenon was first explained by the fact that once the neutron νg 7/2 orbit is being filled, the proton subshell suddenly disappears due to the νg 7/2 -πg 9/2 interaction [1]. In a Nilsson approach, the phenomenon was explained by strongly interacting proton and neutron Nilsson orbits ( [2] and references therein). For the neutrons, the down-sloping ν1/2 − [550] and the ν3/2 − [541] intruder orbits, both resulting from the spherical h 11/2 orbit, drive the deformation.…”

B(E2;21+→01+)value inKrRégis1, Jolie2, Saed-Samii3 et al. 2014Phys. Rev. CSelf Cite210110View full textAdd to dashboardCite

“…Neutron-rich nuclei in the region around Z = 40 and N = 60 have been the focus of intensive investigation from both theoretical and experimental points of view for three decades [1][2][3][4][5][6][7][8]. A remarkable feature is the sudden onset of quadrupole deformation in the zirconium (Z = 40), molybdenum (Z = 42), and strontium (Z = 38) isotopic chains when going from neutron number N = 58 to N = 60.…”