Nuclear reaction time delays of 10−20 sec through a measurement of bremsstrahlung spectra in low energy p-12C resonant scattering

Time analysis of the elastic neutron scattering by the 58Ni nuclei in the range 0.5–0.8 MeV

“…The problem we plan to consider concerns specific aspects of the time evolution in the course of nuclear reactions. It is a part of a longstanding problem of collision theory [1] that has been studied intensively both theoretically [2][3][4][5][6][7] and experimentally [8][9][10][11][12] for years. One fruitful approach to the time analysis of nuclear reactions is associated with the Ericson theory [4].…”

Novel soft-photon analysis of ppγ below pion-production threshold

“…The most succesful example in the first case is the determination of the magnetic moments of the ∆ ++ (∆ 0 ) from π + pγ (π − pγ) data in the energy region of the ∆(1232) resonance [1]. In the case of reaction mechanisms, a well-known example is the extraction of nuclear time delays from the p 12 Cγ data near the 1.7-MeV resonance [2]. The time delay distinguishes between direct and compound nuclear reactions.…”

“…Particle A (B) is assumed to have mass m A (m B ), charge Q A (Q B ), and anomalous magnetic moment κ A (κ B ). For process (1), we can define the following Mandelstam variables: 2 , and u 2 = (q f − p i ) 2 . Since a soft-photon amplitude depends only on either (s,t) or (u,t), chosen from the above set, we can derive two distinct classes of soft-photon amplitudes: M (1) µ (s, t) and M (2) µ (u, t) [8].…”

“…For process (1), we can define the following Mandelstam variables: 2 , and u 2 = (q f − p i ) 2 . Since a soft-photon amplitude depends only on either (s,t) or (u,t), chosen from the above set, we can derive two distinct classes of soft-photon amplitudes: M (1) µ (s, t) and M (2) µ (u, t) [8]. The general amplitude from the first class is the two-s-two-t special amplitude M T sT ts µ (s i , s f ; t q , t p ); that from the second class is the two-u-two-t special amplitude M T uT ts µ (u 1 , u 2 ; t q , t p ).…”