Investigation of the surrogate-reaction method via the simultaneous measurement of gamma-emission and fission probabilities

Abstract

Abstract. We present the results of two experiments where we have measured for the first time simultaneously the fission and gamma-decay probabilities induced by different surrogate reactions. In particular, we have investigated the 238 U(d,p), 238 U( 3 He,t) and 238 U( 3 He, 4 He) reactions as surrogates for the neutron-induced n + 238 U, n + 237 Np and n + 236 U reactions, respectively. In the region where gamma emission, neutron emission and fission compete, our results for the fission probabilities agree fairly well with the neutron-induced data, whereas our gamma-decay probabilities are significantly higher than the neutroninduced data. The interpretation of these results is not obvious and is discussed within the framework of the statistical model with preliminary results for calculated spin-parity distributions populated in surrogate reactions. We also present future plans for surrogate-reaction studies in inverse kinematics with radioactiveion beams at storage rings.

Monte Carlo simulation of γ and fission transfer-induced probabilities using extended 𝓡-matrix theory: Application to the 237U∗ system

“…Promising results off the surrogate-reaction method were obtained consistently in terms of cross sections and surrogate probabilities according to both fission and γ channels; thanks to the recent simultaneous fission and γ channels 238 U( 3 He, 4 He) 237 U * surrogate measurements [12]. However, spin-parity entrance population distribution calculations remain a genuine challenge that needs special attention in future developments of Present (3He,4He fission) using Thompson deformed Present (3He,4He gamma) using Thompson deformed Present (t,pf) AVXSF simulation using Back (1974) S N Figure 5.…”

“…However, spin-parity entrance population distribution calculations remain a genuine challenge that needs special attention in future developments of Present (3He,4He fission) using Thompson deformed Present (3He,4He gamma) using Thompson deformed Present (t,pf) AVXSF simulation using Back (1974) S N Figure 5. 237 U * fission (solid curves) and γ (dashed curve) surrogate-like probabilities computed with AVX SF and compared with preliminary 238 U( 3 He, 4 He) 237 U * surrogate data (circles) from P. Marini, B. Jurado et al [12] and (t,pf) data (diamonds) from Britt and Cramer [16].…”

Simultaneous Determination of Neutron-Induced Fission and Radiative Capture Cross Sections from Decay Probabilities Obtained with a Surrogate Reaction

“…Heavy-ion storage rings provide radioactive beams of extraordinary quality and enable the use of ultrathin, windowless targets. Therefore, in the longer term we will combine surrogate reactions and storage rings to simultaneously measure the decay probabilities of all opendecay channels for many short-lived nuclei with high precision [47].…”

First investigation of the response of solar cells to heavy ions above 1 AMeV

“…The cells were operational after baking. This and the possibility to use them as counters in coincidence measurements, makes solar cells an interesting option to be considered in our future measurements at storage rings [12].…”

“…Some years later, Ajitanand et al highlighted the solar cells radiation hardness as well as their capability to detect fission fragments in an intense background of light charged nuclei [2]. In 1987, Liatard et al exposed solar cells to scattered ions of 12 C up to energies of 240 MeV revealing a linear energy response just up to 80 MeV [3]. This study also measured the time resolution between two cells of 10 mm 2 to be 12 ns FWHM and pointed out the dependence of the time response on the cell size.…”