Cosmophysical aspects of relativistic nuclear fragmentation

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Abstract

The status of the study of multiple fragmentation of 950 MeV per nucleon Kr nuclei in a nuclear track emulsion aimed at determining the contributions of 2α decays of 8Be, the Hoyle 3α state, and the search for a 4α particle condensate state, is presented. In events with the production of few relativistic fragments of He and H, the possibility of estimating the multiplicity of neutrons in the fragmentation cone of a projectile nucleus is studied. For the planar component of neutron transverse momenta estimated from the angles of observed secondary stars, the Rayleigh distribution parameter was 35 ± 7 MeV/c. The importance of such events for the interpretation of cosmophysical observations is noted.

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About the authors

A. A. Zaitsev

Joint Institute for Nuclear Research; P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Author for correspondence.
Email: zaicev@jinr.ru
Russian Federation, Dubna; Moscow

N. Marimuthu

Joint Institute for Nuclear Research

Email: zaicev@jinr.ru
Russian Federation, Dubna

D. A. Artemenkov

Joint Institute for Nuclear Research

Email: zaicev@jinr.ru
Russian Federation, Dubna

P. I. Zarubin

Joint Institute for Nuclear Research; P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Email: zaicev@jinr.ru
Russian Federation, Dubna; Moscow

N. G. Peresadʹko

Email: zaicev@jinr.ru
Russian Federation

V. V. Rusakova

Joint Institute for Nuclear Research

Email: zaicev@jinr.ru
Russian Federation, Dubna

References

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Supplementary files

Supplementary Files
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2. Fig. 1. Macrophotograph of the peripheral interaction of the 124Xe nucleus with an energy of 3.8 GeV per nucleon (irradiation in 2022 at the NICA accelerator complex).

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3. Fig. 2. Distribution in the region of small values of the excess invariant mass Q of pairs (dots), triplets (solid line) and quadruples (shaded region) of α-particles formed in the fragmentation of Kr nuclei.

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4. Fig. 3. Distribution of events by multiplicity of relativistic fragments of He and H.

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5. Fig. 4. Correlation of the SNS number and the multiplicity of He and H fragments in the fragmentation cone. The number of He and H fragments is given in brackets.

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6. Fig. 5. Macrophotographs of secondary stars in the fragmentation cone, interpreted as neutron-induced.

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7. Fig. 6. Distribution of SNS star coordinates in the XY focal plane relative to the primary vertex.

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8. Fig. 7. Distribution over the plane angle φ of SNS observation relative to the direction of the primary trace, approximated by a Gaussian function (dashed curve).

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9. Fig. 8. Distribution of the planar component of the transverse momenta of neutrons in the fragmentation cone, approximated by the Rayleigh function (dashed curve).

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