Summary
We report the results of a measurement of the kinetic energies of the complementary fragments released in the spontaneous fission of252Cf. The pre-neutron emission values of the fragment masses are reconstructed starting from the energies measured. For low excitation energies of the fragments, six fine structures in the mass distribution are observed. These results are discussed referring to previous experimental data, and correlated with preferred even-even charge division in the fission process.
Riassunto
Presentiamo i risultati di una misura delle energie cinetiche dei frammenti di fissione emessi nella fissione spontanea del252Cf. Partendo dalle energie misurate, si ricostruiscono i valori pre-emissione neutronica delle masse dei frammenti. Per basse energie di eccitazione dei frammenti, si sono osservate sei strutture fini nella distribuzione di massa. Questi risultati sono discussi riferendoli a precedenti dati sperimentali e sono correlati con la divisione di carica preferenziale pari-pari nel processo di fissione.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
J. C. D. Milton andJ. S. Fraser:Phys. Rev.,111, 877 (1958).
J. C. D. Milton andJ. S. Fraser:Phys. Rev. Lett.,7, 67 (1961).
J. C. D. Milton andJ. S. Fraser:Can. Journ. Phys.,40, 1626 (1962).
J. S. Fraser, J. C. D. Milton, H. R. Bowmann andS. G. Thompson:Can. Journ. Phys.,41, 2080 (1963).
S. L. Whetstone:Phys. Rev.,131, 1232 (1963).
H. W. Schmitt, W. E. Kiker andC. W. Williams:Phys. Rev.,137, B 837 (1965).
W. M. Gibson, T. D. Thomas andG. L. Miller:Phys. Rev. Lett.,7, 65 (1961).
H. W. Schmitt, J. H. Neiler andF. J. Walter:Phys. Rev.,141, 1146 (1966).
M. J. Bennett andW. E. Stein:Phys. Rev.,156, 1277 (1967).
I. A. Baranov, A. N. Protopopov andB. M. Shiryaev:Yad. Fiz.,10, 1149 (1969) (English translation:Sov. Journ. Nucl. Phys.,10, 654 (1970)).
W. N. Reisdorf, J. P. Unik andL. E. Glendenin:Nucl. Phys.,205 A, 348 (1973).
V. P. Zakharova, D. K. Ryazanov, B. G. Basova, A. D. Rabinovich andV. A. Kostylev:Yad. Fiz.,162, 649 (1972) (English translation:Sov. Journ. Nucl. Phys.,16, 364 (1973)).
J. S. Fraser andJ. C. D. Milton:Ann. Rev. Nucl. Sci.,16, 379 (1966).
M. Forte, A. Bertin, M. Bruno, G. Vannini andA. Vitale:Nucl. Inst. Meth.,108, 525 (1973);A. Bertin, M. Bruno, G. Vannini, A. Vitale andM. Forte:Phys. Lett.,43 A, 231 (1973).
M. Forte:Proc. Colloque Intern. sur l’Electronique Nucléaire (Versailles, 1968), p. 159.
R. L. Watson, J. B. Wilhelmy, R. C. Jared, C. Rugge, H. R. Bowman, S. G. Thompson andJ. O. Rasmussen:Nucl. Phys.,141 A, 449 (1970).
H. R. Bowman, J. C. D. Milton, S. G. Thompson andW. J. Swiatecki:Phys. Rev.,126, 2120 (1962);129, 2133 (1963).
J. Terrell:Phys. Rev. 127, 880 (1962).
W. John, F. W. Guy andJ. J. Wesolowski:Phys. Rev. C,4, 1451 (1970).
W. Reisdorf, J. P. Unik, H. G. Griffin andL. E. Glendenin:Nucl. Phys.,177 A, 337 (1971).
T. Pinelli: private communication.
T. D. Thomas andR. Vandenbosch:Phys. Rev.,133, B 976 (1964).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bertin, A., Bruno, M., Massa, I. et al. Fine structures in the mass yield of252Cf fission fragments from a double-energy measurement. Nuov Cim A 23, 185–199 (1974). https://doi.org/10.1007/BF02739477
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02739477