The time delay in fission induced by bombardment of W with 180 MeV 32S, 240–255 MeV 48Ti, and 315–375 MeV 58Ni has been measured by observation of crystal blocking. There is a clear narrowing and a small increase in the minimum yield of the angular dips for fission compared with scaled dips for elastically scattered ions. This is interpreted as a fission delay of about 2 as, only weakly dependent on energy and atomic number. The delay is longer by 1 to 2 orders of magnitude than obtained from standard interpretations of measurements of prescission neutrons and giant-dipole-resonance gamma rays and from calculations of the nuclear dynamics in heavy-ion reactions.
Crystal blocking measurements of the time delay of fission induced by S, Ti and Ni borbardment of W / J.U.Andersen;J.Chevallier;J.S.Forster;S.A.Karamian;C.R.Vane;J.R.Beene;A.Galindo-Uribarri;J.Gomez del Campo;H.F.Krause;E.Padilla-Rodal;D.Radford;C.Broude; F.Malaguti;A.Uguzzoni. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 99:(2007), pp. 162502-1-162502-4. [10.1103/PhysRevLett.99.162502]
Crystal blocking measurements of the time delay of fission induced by S, Ti and Ni borbardment of W
MALAGUTI, FRANCO;UGUZZONI, ARNALDO
2007
Abstract
The time delay in fission induced by bombardment of W with 180 MeV 32S, 240–255 MeV 48Ti, and 315–375 MeV 58Ni has been measured by observation of crystal blocking. There is a clear narrowing and a small increase in the minimum yield of the angular dips for fission compared with scaled dips for elastically scattered ions. This is interpreted as a fission delay of about 2 as, only weakly dependent on energy and atomic number. The delay is longer by 1 to 2 orders of magnitude than obtained from standard interpretations of measurements of prescission neutrons and giant-dipole-resonance gamma rays and from calculations of the nuclear dynamics in heavy-ion reactions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
