Second0+state of unboundO12: Scaling of mirror asymmetry

Abstract

The unbound 12 O nucleus was studied via the two-neutron transfer (p,t) reaction in inverse kinematics using a radioactive 14 O beam at 51 MeV/u. Excitation energy spectra and differential cross sections were deduced by the missing mass method using MUST2 telescopes. We achieved much higher statistics compared to the previous experiments of 12 O, which allowed accurate determination of resonance energy and unambiguous spin and parity assignment. The 12 O resonance previously reported using the same reaction was confirmed at an excitation energy of 1.62 ± 0.03(stat.) ± 0.10(syst.). MeV and assigned spin and parity of 0 + from a distorted-wave Born approximation analysis of the differential cross sections. Mirror symmetry of 12 O with respect to its neutron-rich partner 12 Be is discussed from the energy difference of the second 0 + states. In addition, from systematics of known 0 + states, a distinct correlation is revealed between the mirror energy difference and the binding energy after carrying out a scaling with the mass and the charge. We show that the mirror energy difference of the observed 0 + state of 12 O is highly deviated from the systematic trend of deeply bound nuclei and in line with the scaling relation found for weakly bound nuclei with a substantial 2s 1/2 component. The importance of the scaling of mirror asymmetry is discussed in the context of ab initio calculations near the drip lines and universality of few-body quantum systems.

Particle decays of levels in N11,12 and O12 investigated with the

“…2(c) and 2(d). The extracted centroid and width are consistent with the values of E * =1.62(13) and Γ=1.2 MeV for the 0 + 2 state from [22]. On the other hand, if the shoulder peak is a decay branch of the second 2 + , we can fix its decay energy and width and refit the spectrum [Fig.…”

“…The low-energy shoulder on the 2 + 1 peak [Fig. 2(c)] is at the approximate location of the second 0 + , E * = 1.62(13) state measured in [22]. It is also at the approximate energy for the 1 − 1 state predicted with GCC calculations (E T =3.256 MeV) [15].…”

Structure and decay of the extremely proton-rich nuclei O11,12

“…The GCC calculations predict several 12 O excited stated in the energy range explored experimentally [34,61]. In particular, we predict an excited J π = 1 − 1 state located between the 0 + 2 and the 2 + 1 states.…”

Analysis of pseudoscalar and scalar D mesons and charmonium decay width in hot magnetized asymmetric nuclear matter

“…In Ref. [40,86], the mass splitting of the different oppositely charged mesons are also investigated by dividing the current correlation function in even and odd terms. In this article, we have considered the average meson currents of the particle D and their antiparticleD.…”