Fragment dependence of high energy $\gamma$-ray emission in the spontaneous fission of $^{252}$Cf

D.C. Biswas; B.K. Nayak; M. Cinausero; B. Fornal; G. Viesti; D. Bazzacco; M. DePoli; D. Fabris; E. Fioretto; M. Lunardon; D.R. Napoli; G. Nebbia; G. Prete; C.A. Ur; G. Vedovato

doi:doi:10.1007/s100500050242

2021 Impact factor 3.131

Hadrons and Nuclei

Eur. Phys. J. A 4, 343-348

Fragment dependence of high energy $\gamma$ -ray emission in the spontaneous fission of ²⁵²Cf

D.C. Biswas¹ - B.K. Nayak¹ - M. Cinausero² - B. Fornal³ - G. Viesti⁴ - D. Bazzacco⁴ - M. DePoli² - D. Fabris⁴ - E. Fioretto² - M. Lunardon⁴ - D.R. Napoli² - G. Nebbia⁴ - G. Prete² - C.A. Ur⁴ - G. Vedovato²

¹ Bhabha Atomic Research Centre, Mumbai, India
² I.N.F.N., Laboratori Nazionali di Legnaro, Via Romea, 4, I-35020 Legnaro, Italy
³ Institute of Nuclear Physics, Krakow, Poland
⁴ Dipartimento di Fisica and INFN, Sezione di Padova, Padova, Italy

Received: 22 December 1998 Communicated by D. Schwalm

Abstract
The high energy $\gamma$ -ray emission accompanying the spontaneous fission of ²⁵²Cf has been measured in coincidence with individual fission fragments selected by discrete $\gamma$ -ray transitions. The enhancement of the $\gamma$ -ray emission probability in the energy range E $_{\gamma}$ =3-8 MeV has been observed for the fission fragments in the region of nearly symmetric mass splitting, confirming results reported in previous investigations. The $\gamma$ - $\gamma$ coincidence technique employed in the present work clearly demonstrate that the major contribution to this enhancement is caused by the fission channels where one fragment is near to the N=82 or Z=50 shell closures. The high energy $\gamma$ -ray emission probability does not show any significant dependence on the number of neutrons emitted in the fission process, supporting the hypothesis that high energy $\gamma$ -rays are mainly emitted from the fragments after the neutron evaporation.