The emission of prompt neutrons from the spontaneous fission of 252No and 244Fm

A. I. Svirikhin; A. V. Andreev; V. N. Dushin; M. L. Chelnokov; V. I. Chepigin; M. Gupta; A. V. Isaev; I. N. Izosimov; D. E. Katrasev; A. N. Kuznetsov; O. N. Malyshev; S. Mullins; A. G. Popeko; E. A. Sokol; A. V. Yeremin

doi:10.1140/epja/i2012-12121-7

2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A (2012) 48: 121
https://doi.org/10.1140/epja/i2012-12121-7

Regular Article - Experimental Physics

The emission of prompt neutrons from the spontaneous fission of ²⁵²No and ²⁴⁴Fm

A. I. Svirikhin¹^*, A. V. Andreev², V. N. Dushin³, M. L. Chelnokov¹, V. I. Chepigin¹, M. Gupta⁴, A. V. Isaev¹, I. N. Izosimov¹, D. E. Katrasev¹, A. N. Kuznetsov¹, O. N. Malyshev¹, S. Mullins⁵, A. G. Popeko¹, E. A. Sokol¹ and A. V. Yeremin¹

¹ Flerov Laboratory of Nuclear Reactions, JINR, 141980, Dubna, Russia
² Bogoliubov Laboratory of Theoretical Physics, JINR, 141980, Dubna, Russia
³ V.G. Khlopin Radium Institute, 194021, St. Petersburg, Russia
⁴ Manipal University, Madhav Nagar, 576104, Manipal, Karnataka, India
⁵ Laboratory for Accelerator-Based Sciences, 7129, Somerset West, South Africa

^* e-mail: asvirikhin@jinr.ru

Received: 10 June 2012
Revised: 14 August 2012
Accepted: 2 September 2012
Published online: 20 September 2012

Abstract

The neutron detector with ³He -filled counters placed in the focal plane of the VASSILISSA separator is used for measuring the average number and determining the multiplicity distribution of prompt neutrons from the spontaneous fission of heavy short-lived isotopes. The test reaction is used for tuning the separator settings and calibrating the detector system with the spontaneous fission of the ²⁵²No . The average neutron number per ²⁵²No spontaneous fission event is as large as . The short-lived heavy isotope ²⁴⁴Fm , produced in the complete fusion reaction ⁴⁰Ar + ²⁰⁶Pb , is investigated. The average number of neutrons per spontaneous fission of ²⁴⁴Fm from the experimental data ( is determined for the first time.