Ionization of muonic atoms by nonrelativistic electrons

Kunc, Joseph A.

doi:10.1103/physreva.49.338

Cited by 2 publications

(5 citation statements)

References 32 publications

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“…4 of Ref. [69]; curve 2). We roughly assume that the destruction cross section of 7 Be * X is σ de (E) = σ de = π{2n 2 /[Z7 Be αµ( 7 Be, X − )]} 2 independent of energy.…”

Section: Transitions To the Gs 7 Bexmentioning

confidence: 96%

“…X as E th = (m7 Be /m e )I( 7 Be 3+ )/8 = 348 keV (n/113) −2 [69]. The cross section for energies above the threshold nearly corresponds to the Bohr radius squared, i.e., π{2n 2 /[Z7 Be αµ( 7 Be, X − )]} 2 , (Fig.…”

Section: Transitions To the Gs 7 Bexmentioning

confidence: 96%

“…There is no study about the cross section for this type of reaction. We then assume the cross section by an analogy of cross sections for ionizations of normal hydrogen which has been measured, and of muonic hydrogen-like particle consisting of a muon and a proton [69,70]. The energy threshold for the ionization of 7 Be * X is determined from the condition that an energy transferred from e ± to 7 Be at a collision be larger than ionization potential of 7 Be *…”

Section: Transitions To the Gs 7 Bexmentioning

confidence: 99%

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7Be charge exchange between 7Be3+ ion and exotic long-lived negatively charged massive particle in big bang nucleosynthesis

Kusakabe,

Kim,

Cheoun

et al. 2013

Preprint

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“…4 of Ref. [69]; curve 2). We roughly assume that the destruction cross section of 7 Be * X is σ de (E) = σ de = π{2n 2 /[Z7 Be αµ( 7 Be, X − )]} 2 independent of energy.…”

Section: Transitions To the Gs 7 Bexmentioning

confidence: 96%

Section: Transitions To the Gs 7 Bexmentioning

confidence: 96%

Section: Transitions To the Gs 7 Bexmentioning

confidence: 99%

See 1 more Smart Citation

7Be charge exchange between 7Be3+ ion and exotic long-lived negatively charged massive particle in big bang nucleosynthesis

Kusakabe,

Kim,

Cheoun

et al. 2013

Preprint

View full text Add to dashboard Cite

show abstract

Section: Transitions To the Gs 7 Bexmentioning

confidence: 99%

“…We then assume the cross section by an analogy of cross sections for ionizations of normal hydrogen which has been measured, and of muonic hydrogen-like particle consisting of a muon and a proton [69,70]. The energy threshold for the ionization of 7 Be * X is determined from the condition that an energy transferred from e ± to 7 Be at a collision be larger than ionization potential of 7 Be * X as E th = (m7 Be /m e )I( 7 Be 3+ )/8 = 348 keV (n/113) −2 [69]. The cross section for energies above the threshold nearly corresponds to the Bohr radius squared, i.e., π{2n 2 /[Z7 Be αµ( (Fig.…”

Section: Transitions To the Gs 7 Bexmentioning

confidence: 99%

Be7charge exchange betweenBe3+7ion and an exotic long-lived negati

et al. 2013

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The existence of an exotic long-lived negatively charged massive particle, i.e., X − , during big bang nucleosynthesis can affect primordial light element abundances. Especially, the final abundance of 7 Li, mainly originating from the electron capture of 7 Be, has been suggested to reduce by the 7 Be destruction via the radiative X − capture of 7 Be followed by the radiative proton capture of the bound state of 7 Be and X − ( 7 BeX ). We suggest a new route of 7 BeX formation, that is the 7 Be charge exchange at the reaction of 7 Be 3+ ion and X − . The formation rate depends on the number fraction of 7 Be 3+ ion, the charge exchange cross section of 7 Be 3+ and the probability that produced excited states 7 Be * X are converted to the ground state. We estimate respective quantities affecting the 7 BeX formation rate, and find that this reaction pathway can be more important than ordinary radiative recombination of 7 Be and X − . The effect of the charge exchange reaction is then shown in a latest nuclear reaction network calculation. Quantum physical model calculations for related reactions are needed to precisely estimate the efficiency of this pathway in future.PACS numbers: 26.35.+c, 95.35.+d, 98.80.Cq, 98.80.Es I. INTRODUCTIONNew physics operating during the big bang nucleosynthesis (BBN) can be probed by observed light element abundances. Possible indications of new physics come from discrepancies between primordial abundances of 6 Li and 7 Li predicted in standard BBN (SBBN) model and those inferred from observations of metal-poor stars (MPSs). These MPSs exhibit a plateau-like abundance ratio, 7 Li/H = (1 − 2) × 10 −10 at low metallicities of [Fe/H]> −3 [1][2][3][4][5][6][7][8][9][10][11][12][13][14], and much lower at extremely low metallicities of [Fe/H]< −3 [15,16] [79]. The plateau abundance is a factor of 2-4 lower than the SBBN prediction for the baryon-to-photon ratio determined from the observation of the cosmic microwave background radiation with Wilkinson Microwave Anisotropy Probe (WMAP) (e.g., 7 Li/H=(5.24 +0.71−0.67 ) × 10 −10 [17]). This discrepancy indicates a need of some mechanism to decrease the 7 Li abundance. Although astrophysical processes such as the combination of atomic and turbulent diffusion in stellar atmospheres [18,19] may be a cause of the observed abundances, this is not yet established [20].In recent spectroscopic observations of MPSs, the lithium isotopic ratio of 6 Li/ 7 Li is also measured. A possible plateau abundance of 6 Li/H∼ 6 × 10 −12 has * Electronic address: motohiko@kau.ac.kr † Electronic address: kyungsik@kau.ac.kr ‡ Electronic address: cheoun@ssu.ac.kr § Electronic address: kajino@nao.ac.jp ¶ Electronic address: y.k@m.tohoku.ac.jp been suggested [4], which is about 1000 times higher than the SBBN prediction. Since an effect of convective motions in stellar atmospheres could cause asymmetries in atomic line profiles and consequently leads to an erroneous estimation of 6 Li abundance [21], the effect should be estimated. Even including this effect, high 6 Li ...

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Ionization of muonic atoms by nonrelativistic electrons

Abstract: Analytical expressions for cross sections for ionization of muonic hydrogenlike atoms by nonrelativistic electrons are derived using the classical impulse approximation.PACS number(s): 34.50.Fa, 21.65.+f, 36.10,Gv

Cited by 2 publications

References 32 publications

7Be charge exchange between 7Be3+ ion and exotic long-lived negatively charged massive particle in big bang nucleosynthesis

7Be charge exchange between 7Be3+ ion and exotic long-lived negatively charged massive particle in big bang nucleosynthesis

Be7charge exchange betweenBe3+7ion and an exotic long-lived negati

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