First identification of excited states in Ba117 using the recoil- β -delayed proton tagging technique

Abstract

Excited states have been observed for the first time in the neutron-deficient nucleus 117 Ba using the Recoil-Decay Tagging technique following the heavy-ion fusion-evaporation reaction 64 Zn( 58 Ni, 2p3n)117 Ba. Prompt γ rays have been assigned to 117 Ba through correlations with β-delayed protons following the decay of A = 117 recoils. Through the analysis of the γ-γ coincidence relationships, a high-spin level scheme consisting of two bands has been established in 117 Ba. Based on the systematics of the level spacings in the neighboring barium isotopes, the two bands are proposed to have νh 11/2 [532]5/2 − and νd 5/2 [413]5/2 + configurations, respectively. The observed band-crossing properties are interpreted in the framework of cranked shell model.

Weak coupling to unitarity crossover in Bose-Fermi mixtures: Mixing-demixing transition and spontaneous symmetry breaking in trapped systems

“…1, we illustrate the present universal function f (x) of Eq. (8) for η B = 4.7 and compare with the same from the microscopic calculation of DG [36] and also with the GP functional f (x) = 4πx and the LHY functional f (x) = 4π(x + αx 5/2 /2). For very small x or for small values a B , both the GP and LHY functionals are in reasonable agreement with the present crossover functional as can be seen in Fig.…”

“…Although there is no experimental estimate of the parameter η B for bosons despite some attempts [10], there are several microscopic many-body calculations of this parameter lying in the range from 3 to 9 [35,36]. Of these, Ding and Greene (DG) [36] performed a microscopic Hartree calculation along the crossover and in addition to the value of η B = 4.7, they provided a reliable estimate of the universal function f (x) along the crossover. In Fig.…”

“…(Color online) Dimensionless function f (x) of the zero-temperature bulk chemical potential(7)versus x. present: the crossover function(8)with ηB = 4.7, DG: Hartree calculation of Ding and Greene[36], GP: GP function f (x) = 4πx, LHY: LHY function f (x) = 4πx + 4παx 5/2 , num: numerically calculated from energy density(11)using µB = ∂(nBEB)/∂nB.…”

Two-step production of resonant Bose-Einstein condensates

“…It represents an unusual situation, inasmuch as the perturbative parameter na 3where n is the number density -is no longer small and the usual field-theoretic ideas struggle to be useful. This circumstance has hatched a variety of alternative theoretical descriptions, which are in general agreement about the nature of the gas, yet differ in details [6][7][8][9][10][11][12][13][14][15][16][17][18].…”

“…Similarly, on resonance each atom can be regarded as belonging to some different orbital wave function ψ ∞ (r). This could be obtained approximately, for example, by performing a Hartree-Fock calculation using a renormalized scattering length a ∝ n −1/3 [6][7][8][9][10]23]. Thus, at least up to a certain approximation, the desired resonant BEC is described by…”