Photodisintegration of He3

Горбунов, А. А.; Varfolomeev, A.T.

doi:10.1016/s0375-9601(63)92320-x

Cited by 20 publications

(3 citation statements)

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“…In order to study the consequences that the different cross sections have on particle propagation through the CMB, we study its transmittance to 4 He nuclei going through a given distance at a given energy. We define T (γ, L) ≡ e −L/λ(γ) for the mean free path (18), and T k (γ, L) ≡ e −L/λ k (γ) for the other three models. Since the model introduced in this paper provides the smallest cross section, it will give the largest transmittance.…”

Section: Photo-disintegration Of 4 He On the Cmbmentioning

confidence: 99%

“…The Greisen-Zatsepin-Kuzmin (GZK) horizon of helium [1,2] is a key parameter in ascertaining the contribution of ultrahigh-energy (E 10 10 GeV) cosmic rays (UHECRs) with directional pointing to nearby sources. Numerical [3,4] and analytical [5] estimates of this parameter, as well as Monte Carlo simulation codes of UHECR propagation [6][7][8][9][10][11] are customarily based on fits [12][13][14][15] to cross-section measurements from the sixties [16][17][18][19][20][21], which do not allow a precise description of the giant dipole resonance (GDR) near threshold.…”

Section: Introductionmentioning

confidence: 99%

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Photo-disintegration of He4 on the cosmic microwave background is less severe than earlier thought

2018

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We thoroughly study the photo-disintegration of 4 He on the cosmic microwave background using the most recent cross-section data both from the inclusive measurement observing the analog of the giant dipole resonance in 4 He through the charge-exchange spin-flip 4 He ( 7 Li, 7 Be) reaction and from measurements of exclusive two-body and three-body processes: 4 He (γ, p) 3 H, 4 He (γ, n) 3 He, and 4 He (γ, pn) 2 H. We show that the present-day (redshift z = 0) mean free path of ultra-relativistic (Lorentz factor ∼ 10 10 ) helium nuclei increases by more that 15% with respect to previous estimates adopted as benchmarks for Monte Carlo simulation codes of ultrahigh-energy cosmic ray propagation. This implies that the physical survival probability of 4 He nuclei would be larger than predicted by existing event generators. For example, for E ∼ 10 10.8 GeV and a propagation distance of 3.5 Mpc, the 4 He intensity would be 35% larger than the output of CRPropa 3 program and 42% larger than the output of SimProp v2r4 program. We provide new parametrizations for the two-body and three-body photodisintegration cross-sections of 4 He, 3 He, tritium, and deuterium.

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Section: Photo-disintegration Of 4 He On the Cmbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photo-disintegration of He4 on the cosmic microwave background is less severe than earlier thought

2018

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“…The mean-square radius of the triton is given by (see Appendix), <r 2 ) 00 =3iV r2 [/c-8 +2^{( K +X)/2}- Gorbunov and Varfolomeev,12 ^-body^^-bod^ wn ere a 2~hody and ^3-body are foe cross sections for the breakup of trinucleons into two and three bodies, respectively. This means o-in t total = 2o-i nt 2 -bod y and o-6 =2o-6 2 -bod y.…”

Section: (37)mentioning

confidence: 99%