Near-threshold measurement of the 4He<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mo stretchy="false">(</mml:mo><mml:mi>γ</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math> reaction

Nilsson, Bengt‐Olof; Adler, J.-O.; Andersson, Bo; Annand, J. R. M.; Akkurt, I.; Boland, Mark; Crawford, G.I.; Fissum, Kevin; Hansen, Kurt Schaldemose; Harty, P.D.; Ireland, D. G.; Isaksson, L.; Karlsson, Martin; Lundin, Magnus; McGeorge, J. C.; Miller, G.J.; Ruijter, H.; Sandell, A.; Schrøder, B.; Sims, D. A.; Watts, D. P.

doi:10.1016/j.physletb.2005.08.081

Cited by 27 publications

(30 citation statements)

References 21 publications

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“…The present situation for the total cross section is summarized in figure 25. One observes a rather good agreement of the theoretical calculation with the data of [108], while there is a large discrepancy with the data of [112]. One further notes that the effect of the three-nucleon force is quite large, it reduces the giant dipole peak height by about 10% and increases the high-energy cross section quite considerably (35% at pion threshold).…”

Section: Photons Thesupporting

confidence: 53%

The Lorentz integral transform (LIT) method and its applications to perturbation-induced reactions

Efros

Leidemann

Orlandini

et al. 2007

J. Phys. G: Nucl. Part. Phys.

167

236

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Abstract.The LIT method has allowed ab initio calculations of electroweak cross sections in light nuclear systems. This review presents a description of the method from both a general and a more technical point of view, as well as a summary of the results obtained by its application. The remarkable features of the LIT approach, which make it particularly efficient in dealing with a general reaction involving continuum states, are underlined. Emphasis is given on the results obtained for electroweak cross sections of few-nucleon systems. Their implications for the present understanding of microscopic nuclear dynamics are discussed.

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Section: Photons Thesupporting

confidence: 53%

The Lorentz integral transform (LIT) method and its applications to perturbation-induced reactions

Efros

Leidemann

Orlandini

et al. 2007

J. Phys. G: Nucl. Part. Phys.

167

236

View full text Add to dashboard Cite

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“…One notes that the 3N force leads to a considerable reduction of the peak cross section. One further sees that there is a very good agreement between theory and the data of [31] and also quite a good agreement with the data of [29], while the cross section of [30] shows a completely different behavior. Also shown in the figure are data from experiments performed about 20 years ago.…”

Section: B Reactions With a ≥supporting

confidence: 65%

“…Such a difference between experiment and an ab initio calculation has led to a renewed experimental interest in the 4 He photoabsorption cross section. In fact in the meantime three additional experiments have been carried out [29,30,31]. Finally, in [5] the first calculation with realistic NN and 3N forces has also been published.…”

Section: B Reactions With a ≥mentioning

confidence: 99%

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The Lorentz Integral Transform (Lit) Method

Leidemann

2009

Int. J. Mod. Phys. E

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The LIT approach is reviewed both for inclusive and exclusive reactions. It is shown that the method reduces a continuum state problem to a bound-state-like problem, which then can be solved with typical bound-state techniques. The LIT approach opens up the possibility to perform ab initio calculations of reactions also for those particle systems which presently are out of reach in conventional approaches with explicit calculations of many-body continuum wave functions.Various LIT applications are discussed ranging from particle systems with two nucleons up to particle systems with seven nucleons.

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“…The dots indicate the experimental data: T(γ, n) D Varfolomeev and Gorbunov (1965), Bosch et al (1964), Skopik et al (1981), Faul et al (1981); T(γ, 2n)p Faul et al (1980). 3 He(γ, p) D Ticcioni et al (1973), Stewart et al (1965), Warren et al (1963), Naito et al (2006); 3 He(γ, n)2p Fetisov et al (1965), Ticcioni et al (1973), Faul et al (1981), Naito et al (2006); 4 He(γ, p) T Shima et al (2001T Shima et al ( ,2005, Kusakabe et al (2009), Arkatov et al (1978b, Gorbunov (1968), Balestra et al (1977); 4 He(γ, n) 3 He Irish et al (1975), Balestra et al (1977), Gorbunov (1968), Shima et al (2001Shima et al ( ,2005, Kusakabe et al (2009), Nilson (2005,2007, Arkatov (1978a); 4 He(γ, D) D Arkatov et al (1980); 4 He(γ, pn) D Shima et al (2001D Shima et al ( ,2005, Arkatov et al (1969b), Gorbunov (1958); 4 He(γ, 2p2n) Balestra et al (1977), Arkatov et al (1969a), Gorbunov (1969). spectral parameters can be obtained by solving the system of ordinary differential equations (4 -7):…”

Section: Kinetics Of the Isotopic Composition Of The Interstellar Mediummentioning

confidence: 99%

Influence of gamma-ray emission on the isotopic composition of clouds in the interstellar medium

2012

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We investigate one mechanism of the change in the isotopic composition of cosmologically distant clouds of interstellar gas whose matter was subjected only slightly to star formation processes. According to the standard cosmological model, the isotopic composition of the gas in such clouds was formed at the epoch of Big Bang nucleosynthesis and is determined only by the baryon density in the Universe. The dispersion in the available cloud composition observations exceeds the errors of individual measurements. This may indicate that there are mechanisms of the change in the composition of matter in the Universe after the completion of Big Bang nucleosynthesis. We have calculated the destruction and production rates of light isotopes (D, 3 He, 4 He) under the influence of photonuclear reactions triggered by the gamma-ray emission from active galactic nuclei (AGNs). We investigate the destruction and production of light elements depending on the spectral characteristics of the gamma-ray emission. We show that in comparison with previous works, taking into account the influence of spectral hardness on the photonuclear reaction rates can increase the characteristic radii of influence of the gamma-ray emission from AGNs by a factor of 2-8. The high gamma-ray luminosities of AGNs observed in recent years increase the previous estimates of the characteristic radii by two orders of magnitude. This may suggest that the influence of the emission from AGNs on the change in the composition of the medium in the immediate neighborhood (the host galaxy) has been underestimated.

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Near-threshold measurement of the 4He(γ,n) reaction

Cited by 27 publications

References 21 publications

The Lorentz integral transform (LIT) method and its applications to perturbation-induced reactions

The Lorentz integral transform (LIT) method and its applications to perturbation-induced reactions

The Lorentz Integral Transform (Lit) Method

Influence of gamma-ray emission on the isotopic composition of clouds in the interstellar medium

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