Bremsstrahlung inαDecay of210Po: DoαParticles Emit Photons in Tunneling?

Abstract

Emission probability of bremsstrahlung in the a decay of 210 Po was measured in a-g coincidence measurements with Si and Ge detectors. It was found that the bremsstrahlung yields are much smaller than those predicted by a Coulomb acceleration model, in which g rays are emitted during acceleration outside the barrier. This suggests that the radiation amplitude in the barrier cannot be neglected, and the discussion based on a quasiclassical approach is given. [S0031-9007(97)03609-0] PACS numbers: 23.60. + e, 23.20. -g, 27.80. + w, 27.90. + b

Multipolar Approach for Description of Bremsstrahlung During α -Decay and Unified Formula of the Bremsstrahlung Probability

“…The bremsstrahlung probability in the α-decay of the 214 Po, 226 Ra and 244 Cm nuclei: red solid line is for the absolute probability calculated by the multipole model, dash-dot blue line for the normalized spectrum calculated by approach [25], dash green line for the absolute probability calculated by formula (55) of the multipole model with taking the spectroscopic factor S (th) α into account for the deformed nucleus 226 Ra (we use approximated value S (th) α = 0.2 from table I in [38]), scatter line for experimental data (data [24] for 214 Po, data [25] for 226 Ra), data [7,28] for 244 Cm)).…”

“…(11)- (15) with parameters -by eqs. (16)- (22) [28] into the total picture. The first step is calculations of wave functions which should be obtained with high accuracy in order to obtain the convergent spectra.…”

“…where (l, 1, j m − µ, µ, m) are Clebsh-Gordon coefficients and Y lm (θ, ϕ) are spherical functions defined, according to [30] (see p. 119, (28,7)- (28,8)). …”

“…From such point of view discussions [21,22] show a way for obtaining the new information about the α-decay: through angular analysis of the bremsstrahlung during the α-decay. But for such researches a model of description of the bremsstrahlung in the α-decay which takes a value of the angle between the directions of the α-particle propagation (or tunneling) and the photon emission into account, should be constructed.…”

“…III A the model is tested on experimental data [24,25] for the 214 Po and 226 Ra nuclei. The spectrum for 244 Cm is added to such a picture, compared with high limit of errors of experimental data [7,28]. In Sec.…”