Observations on the long-lived Mossbauer effects of 93mNb

Abstract

Several observations of the Nb long-lived Mossbauer phenomena are presented, in consequence of an irradiation increased by an order of magnitude compared with previous work. These are 1) two β decays of 182Ta and 92mNb are enhanced, i.e., 182Ta is now 200 times faster than in previous results while 92mNb is twice as fast as normal; 2) γs emitted from two β decays compete to eject electrons in a winner-takes-all rule, rather than by superposition; 3) abrupt spectral changes reveal three decay phases of 182Ta; 4) the biphoton γγ of 93mNb is released from the sample for the first time; 5) the γγ distribution is narrow, in contrast to the broad γγ spectrum obtained from independent nuclei; 6) Nb K-lines super-radiate along the long sample axis; 7) collective scattering of multipolar MeV γs. The manipulation of nuclear decay speeds demonstrated here highlights a potential application of this work in cleaning up the nuclear wastes.

Superradiant MeV γ Scattered by a Room-Temperature Spinor Quantum Fluid

“…The NSDW subsequently entered three regimes (I, II, and III) as its density increased, which were demonstrated by the behaviors of Rabi splitting [7,14]. We summarized the phenomena observed in regimes I and II in the supplementary information of our previous report [9]. In this report we concentrate on regime III, as well as an additional new regime beyond it.…”

“…Long-lived Mossbauer nuclides emit biphoton γγ or a biphoton pair to preserve the energy from releasing a phonon [7][8][9][10][11]. Once nuclear resonance occurs, a single nuclear γ excitation delocalizes to billions of identical nuclei in the crystal.…”

“…The nuclear exciton spreads in a µm region over the photonic crystal of identical nuclei, and it carries no 2 of 13 charge, but does carry a spin. However, the term "nuclear exciton" [13] fails to capture the important character of an antiferromagnetic nesting spin chains [9]. We, therefore, prefer the term "nuclear spin-density wave" (NSDW) [7].…”

“…Early NSDW investigations focused on the 103m Rh of one-hour half-life [7,[9][10][11] activated by a 6-MeV bremsstrahlung source in Beijing. The NSDW subsequently entered three regimes (I, II, and III) as its density increased, which were demonstrated by the behaviors of Rabi splitting [7,14].…”

“…The activated Nb single crystal was an oval plate (13 mm × 12 mm × 1 mm), which was applied to measure the magnetoelectric effect (ME) induced by the BEC. The γ spectra of 93m Nb provided no biphoton information, until the γγ at the half-transition energy (15.4 keV) were recently released from another polycrystalline sample used in this report [9]. We continued to verify the 93m Nb NSDW BEC for many years, until a transverse ME symmetry depending on the sample geometry was seen [7,11], recognized as the dynamics of low-lying bound states in the topological defects of NSDW quantum fluid.…”