Measurement of the Ground-State Gamma-Ray Branching Ratio of thedtReaction at Low Energies

Ab InitioMany-Body Calculations of theH3(d,n)He4andNavrátil1, Quaglioni2 2012Phys. Rev. Lett.13551630View full textAdd to dashboardCite

“…With its low activation energy and high yield, 3 Hðd; nÞ 4 He is also the easiest reaction to achieve on Earth, and is pursued by research facilities directed toward developing fusion power by either magnetic (e.g., ITER [2]) or inertial (e.g., NIF [3]) confinement. The cross section for the d þ 3 H fusion is well known experimentally, while more uncertain [4] is the situation for the branch of this reaction, 3 Hðd; nÞ 4 He, that is being considered as a possible plasma diagnostic in modern fusion experiments [5]. Larger uncertainties also dominate the 3 Heðd; pÞ 4 He reaction that is known for presenting considerable electron-screening effects at energies accessible by beam-target experiments.…”

“…[13], while the deuteron projectile formalism was introduced in Ref. [15], where we studied the d À 4 He system. To calculate the 3 Hðd; nÞ 4 He and 3 Heðd; pÞ 4 He reactions, we had to address the additional contributions of matrix elements (2 for the norm and 5 for the Hamiltonian kernel, respectively) between the two mass partitions: (A À 1, 1) and (A À 2, 2).…”

The behaviour of fast ions in tokamak experiments

“…Charged fusion products are easily collimated but their trajectories are affected by the magnetic field, so determination of their spatial origin can be complex. For large MeV ion populations, fusion gamma measurements are useful, but the relatively small branching ratio [430,4311 restricts their utility at lower densities and energies.…”

Picosecond laser made of a gadolinium scandium gallium garnet crystal doped with Cr and Nd

“…In their review of the diagnostics of intense pulsed ion beams, Young et al [1] note the potential for the radiative capture reaction 12 C(p, γ ) 13 N as the basis for determining the energy and fluence of a proton beam. Medley and Hendel [2] later proposed the specific gamma ray producing reactions d(t,γ ) 5 He and d( 3 He,γ ) 5 Li as potential diagnostics of tokamak fusion plasmas. Cecil and Newman [3] then suggested a measurement of the energy and width of the gamma ray lines from the fusion reactions among the isotopes of hydrogen (p, d and t) that are independent of the ion densities as a method for determining the temperatures of thermonuclear hydrogen plasmas.…”

“…At this juncture it was realized by several groups that there were no reliable measurements of the cross sections for a number of these reactions at the appropriate low energies (∼100 keV). Measurements of these reactions were subsequently reported by Cecil and Wilkinson [5], Morgan et al [6] and Kammerad et al [7] for the reaction d(t,γ ) 5 He, Cecil et al [8] for the reaction d( 3 He,γ ) 5 Li and Wilkinson and Cecil [9] and Barnes et al [10] for the reaction d(d, γ ) 4 He.…”