Radiative double electron capture in heavy-ion atom collisions

Warczak, A.; Kucharski, Marek; Stachura, Z.; Geißel, H.; Irnich, H.; Kandler, T.; Kozhuharov, C.; Mokler, P. H.; Münzenberg, G.; Nickel, F.; Scheidenberger, C.; Stöhlker, Th.; Suzuki, T.; Rymuza, P.

doi:10.1016/0168-583x(95)00132-8

Cited by 30 publications

(16 citation statements)

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“…If two electrons are captured by two protons in the nucleus, and neutrinos are not emitted, the process is called neutrinoless double-electron capture (0νDEC) [6] in which the lepton number is not conserved, and the neutrino is its own antiparticle, a Majorana particle. If observed, this mode of decay described in equation (2) would require new particle physics beyond the Standard Model.…”

Section: Introductionmentioning

confidence: 99%

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Measuring double-electron capture with liquid xenon experiments

et al. 2014

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We investigate the possibilities of observing the decay mode for 124 Xe in which two electrons are captured, two neutrinos are emitted, and the final daughter nucleus is in its ground state, using dark matter experiments with liquid xenon. The first upper limit of the decay half-life is calculated to be 1.66×1021 years at a 90% confidence level (C.L.) obtained with the published background data from the XENON100 experiment. Employing a known background model from the Large Underground Xenon (LUX) experiment, we predict that the detection of double-electron capture of 124 Xe to the ground state of 124 Te with LUX will have approximately 115 events, assuming a half-life of 2.9 × 10 21 years. We conclude that measuring 124 Xe 2ν double-electron capture to the ground state of 124 Te can be performed more precisely with the proposed LUX-Zeplin (LZ) experiment.

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Section: Introductionmentioning

confidence: 99%

“…The decay mode of an atomic nucleus in which two of the orbital electrons are captured by two protons and two neutrinos are emitted in the process is called two neutrinos double-electron capture (2νDEC) [1][2][3]. Equation (1) shows the decay process.…”

Section: Introductionmentioning

confidence: 99%

Measuring double-electron capture with liquid xenon experiments

et al. 2014

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“…To optimize for the best experimental conditions under which RDEC can be observed, solid targets were chosen in nonrelativistic collisions to obtain the highest rates of double-electron capture [13]. So lid-state targets were also proposed theoretically in slow collisions with mult icharged ions [7] where valence electrons behave as quasifree particles with a characteristic velocity considerably smaller than that of the projectile even for ~1 MeV/u collisions.…”

Section: Introductionmentioning

confidence: 99%

Single-photon emission associated with double electron capture inF9++Ccollisions

et al. 2016

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Radiat ive double electron capture (RDEC), the one-step process occurring in ion-atom collisions, has been investigated for bare fluorine ions collid ing with carbon. RDEC is completed when two target electrons are captured to a bound state of a projectile s imu ltaneously with the emission of a single photon. This work is a follow-up to our earlier measurement of RDEC for bare o xygen projectiles, thus providing a recipient system free of electron-related Coulo mb fields in both cases and allowing for the compar ison between the two collision systems as well as with available theoretical studies. The most significant mechanisms of xray emission that may contribute to the RDEC energy region as background processes are also addressed.

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“…For that we consider the double electron capture followed by the emission of a single photon in the high energy limit. Since the first attempts to detect this process in collisions of a light atom with a heavy nucleus [5] a number of experimental [6,7] and theoretical [8,9,10] papers were devoted to this reaction.…”

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confidence: 99%

“…Such a possible experimental access to the triple coalescence point was not yet proposed in literature. In the experiments [5]- [7]the projectiles which captured two electrons were registered in coincidence with the photon. This enables to distinguish the process among the other capture processes in spite of its small cross section.…”

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confidence: 99%

Triple-coalescence singularity in a dynamical atomic process

Drukarev

Михайлов

et al. 2008

Jetp Lett.

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We show that the high energy limit for amplitude of the double electron capture to the bound state of the Coulomb field of a nucleus with emission of a single photon is determined by behavior of the wave function in the vicinity of the singular triple coalescence point. PCAC: 31.25.Eb; It is well known that the solution Ψ(r 1 , r 2 ) of the Schrödinger equation for a two-electron system in the Coulomb field of infinitely heavy point nucleus is singular at the triple coalescence point r 1 = r 2 = 0 [1, 2, 3, 4]. The wave function can be presented as a generalized power series containing logarithmic terms. The behavior of Ψ(r 1 , r 2 ) near this point is not very important in calculations of the binding energy since the corresponding phase volume is small. On the contrary it becomes crucial for calculation of the local energy E(r 1 , r 2 ) = HΨ(r 1 , r 2 )/Ψ(r 1 , r 2 ) [4]. However the triple coalescence point did not manifest itself in a dynamical process until now.In this letter we present an observable effect for the first time in which the interesting behavior of the two electron wave function Ψ(r 1 , r 2 ) near the point r 1 = r 2 = 0 (as well as that near the double coalescence points r 1 = 0 and r 2 = 0) plays an important role. For that we consider the double electron capture followed by the emission of a single photon in the high energy limit. Since the first attempts to detect this process in collisions of a light atom with a heavy nucleus [5] a number of experimental [6,7] and theoretical [8,9,10] papers were devoted to this reaction.Neglecting the internal motion of the electrons in the light atom we consider the capture of two continuum electrons with equal linear momenta p 1 = 1

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Radiative double electron capture in heavy-ion atom collisions

Cited by 30 publications

References 11 publications

Measuring double-electron capture with liquid xenon experiments

Measuring double-electron capture with liquid xenon experiments

Single-photon emission associated with double electron capture inF9++Ccollisions

Triple-coalescence singularity in a dynamical atomic process

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