Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

First experiment at the Super Heavy Element Factory: High cross section of Mc 288 in the Am 243 + Ca 48 reaction and identification of the new isotope Lr 264

Journal Article · · Physical Review. C
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [3];  [1];  [1];  [1];  [1];  [1];  [1] more »;  [1];  [1];  [1];  [1];  [1];  [4];  [4];  [4];  [4];  [5];  [6];  [6];  [6];  [7] « less
  1. Joint Institute for Nuclear Research, Dubna (Russian Federation)
  2. Joint Institute for Nuclear Research, Dubna (Russian Federation); L.N. Gumilyov Eurasian National University, Nur-Sultan (Kazakhstan)
  3. Joint Institute for Nuclear Research, Dubna (Russian Federation); Palacky University, Olomouc (Czech Republic)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); University of Tennessee, Knoxville, TN (United States)
  6. Chinese Academy of Sciences (CAS), Lanzhou (China)
  7. Joint Institute for Nuclear Research, Dubna (Russian Federation); Chinese Academy of Sciences (CAS), Lanzhou (China)
+ Show Author Affiliations
Here, we present results of the first experiment aimed at the synthesis of Mc isotopes in the 243Am+48Ca reaction performed at the new gas-filled separator DGFRS-2 online to the new cyclotron DC280 at the Super Heavy Element Factory at JINR. Fifty-five new decay chains of 288Mc and six chains assigned to 289Mc were detected. The α decay of 268Db with an energy of 7.6–8.0 MeV, half-life of 16$$^{+6}_{-4}$$h, and a branch of 55$$^{+20}_{-15}$$% was registered for the first time, and a new spontaneously fissioning isotope 264Lr with a half-life of 4.9$$^{+2.1}_{-1.3}$$h was identified. The cross section for the 243Am(48Ca,3n)288Mc reaction was measured to be 17.1$$^{+6.3}_{-4.7}$$ pb, which is the largest value for the known superheavy nuclei at the island of stability.
Research Organization:
Ministry of Science and Higher Education of the Russian Federation; Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Joint Institute for Nuclear Research; Ministry of Science and Higher Education of the Russian Federation; National Natural Science Foundation of China; USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1890311
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 106; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (28)

A new test for random events of an exponential distribution journal July 2000
Program for constructing the estimates of the parameter of the exponential distribution under conditions of poor statistics journal May 1978
Nuclear properties according to the Thomas-Fermi model journal May 1996
Properties of heaviest nuclei with 98 ≤ Z ≤ 126 and 134 ≤ N ≤ 192 journal March 2021
Pioneering experiments on the chemical properties of element 113 journal September 2014
DGFRS-2—A gas-filled recoil separator for the Dubna Super Heavy Element Factory
  • Oganessian, Yu. Ts.; Utyonkov, V. K.; Popeko, A. G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1033 https://doi.org/10.1016/j.nima.2022.166640
journal June 2022
On-line separators for the Dubna Superheavy Element Factory journal June 2016
Superheavy nuclei from 48Ca-induced reactions journal December 2015
Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am journal September 2016
Surface diffuseness correction in global mass formula journal June 2014
Heaviest nuclei from 48 Ca-induced reactions journal March 2007
The AME2016 atomic mass evaluation (II). Tables, graphs and references journal March 2017
Simulations of recoil trajectories in Dubna Gas-Filled Recoil Separator 2 by GEANT4 toolkit journal July 2022
Investigation of Ca48 -induced reactions with Pu242 and U238 targets at the JINR Superheavy Element Factory journal August 2022
Measurements of cross sections for the fusion-evaporation reactions 2 0 4 , 2 0 6 , 2 0 7 , 2 0 8 Pb + 48 Ca and 207 Pb + 34 S : Decay properties of the even-even nuclides 238 Cf and 250 No journal October 2001
Average charge states of heavy atoms in dilute hydrogen journal November 2001
Experiments on the synthesis of element 115 in the reaction Am 243 ( Ca 48 , x n ) 115 291 − x journal February 2004
Measurements of cross sections and decay properties of the isotopes of elements 112, 114, and 116 produced in the fusion reactions U 233 , 238 , Pu 242 , and Cm 248 + Ca 48 journal December 2004
Investigation of the 243 Am + 48 Ca reaction products previously observed in the experiments on elements 113, 115, and 117 journal January 2013
Experimental studies of the 249 Bk +  48 Ca reaction including decay properties and excitation function for isotopes of element 117, and discovery of the new isotope 277 Mt journal May 2013
Decay spectroscopy of element 115 daughters: Rg 280 → Mt 276 and Mt 276 → Bh 272 journal August 2015
Fusion reaction Ca 48 + Bk 249 leading to formation of the element Ts ( Z = 117 ) journal May 2019
Spectroscopy of Element 115 Decay Chains journal September 2013
First Direct Measurements of Superheavy-Element Mass Numbers journal November 2018
Calculated masses of heaviest nuclei journal June 2003
Start-Up of the DC-280 Cyclotron, the Basic Facility of the Factory of Superheavy Elements of the Laboratory of Nuclear Reactions at the Joint Institute for Nuclear Research journal November 2019
Spontaneous-fission decay properties and production cross-sections for the neutron-deficient nobelium isotopes formed in the 44, 48Ca + 204, 206, 208Pb reactions journal April 2003
Identification of a K isomer in 252No journal September 2007

Figures / Tables (3)

TABLE I(p. 2)table TABLE I
FIG. 1(p. 3)figure FIG. 1
FIG. 2(p. 4)figure FIG. 2

Similar Records

Description of the multinucleon transfer mechanism for Ca48+Pu244 and Kr86+Pt198 reactions in a quantal transport approach
Journal Article · Mon Dec 11 19:00:00 EST 2023 · Physical Review. C · OSTI ID:2229627
β -delayed neutron emission of Mn64, Cr62 , and Fe65
Journal Article · Mon Aug 26 20:00:00 EDT 2024 · Physical Review. C · OSTI ID:2438190
Persistence of the Z=28 shell gap in A=75 isobars: Identification of a possible (1/2–) μs isomer in Co75 and β decay to Ni75
Journal Article · Sun Jun 27 20:00:00 EDT 2021 · Physical Review. C · OSTI ID:1850007

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
alpha decay
nuclear fusion
nuclear reactions
nuclear structure and decays