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Title: Production cross sections of elements near the N = 126 shell in Ca 48 -induced reactions with Gd 154 , Tb 159 , Dy 162 , and Ho 165 targets

Abstract

Excitation functions for shell-stabilized evaporation residues produced in 48 Ca -induced reactions with 154 Gd , 159 Tb , 162 Dy , and 165 Ho targets have been measured in experiments performed at the Cyclotron Institute at Texas A&M University. The examined energy range predominantly covers the 3 n and 4 n evaporation channels with higher cross sections measured for the 4 n products. The σ 4 n are nearly invariant within experimental uncertainty in reactions with 159 Tb , 162 Dy , and 165 Ho with the maxima at 12.6 ± 1.9, 12.6 ± 1.7, and 9.4 ± 1.3 mb, respectively. For the reaction with 154 Gd , the maximum is slightly lower at 4.0 ± 0.6 mb. A simple model to describe the measured production cross sections was employed. Capture was estimated by using the “diffused barrier formula” from the “fusion by diffusion” model proposed by Swiatecki et al. [Phys. Rev. C 71, 014602 (2005)]. The fusion probability was estimated by using a phenomenological expression presented by Siwek-Wilczynska et al. [Int. J. Mod. Phys. E 17, 12 (2008)]. The survival probability was calculated according to the formula of Vandenbosch and Huizenga [Nuclear Fission (Academic, New York, 1973)], derivedmore » from transition-state theory. The best agreement is reached between calculation and experiment upon inclusion of collective effects in the calculation of the survival probability, shown previously to be important for production of weakly deformed nuclei. This, in turn, challenges the expectation that strong shell stabilization benefits the production cross section. The present data are compared with earlier studies on production of neutron-deficient nuclei in Ca-induced reactions with lanthanide targets.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Nuclear Physics
OSTI Identifier:
1392003
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 2; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Mayorov, D. A., Werke, T. A., Alfonso, M. C., Bennett, M. E., and Folden, C. M. Production cross sections of elements near the N=126 shell in Ca48 -induced reactions with Gd154,Tb159,Dy162 , and Ho165 targets. United States: N. p., 2014. Web. doi:10.1103/PhysRevC.90.024602.
Mayorov, D. A., Werke, T. A., Alfonso, M. C., Bennett, M. E., & Folden, C. M. Production cross sections of elements near the N=126 shell in Ca48 -induced reactions with Gd154,Tb159,Dy162 , and Ho165 targets. United States. doi:10.1103/PhysRevC.90.024602.
Mayorov, D. A., Werke, T. A., Alfonso, M. C., Bennett, M. E., and Folden, C. M. Fri . "Production cross sections of elements near the N=126 shell in Ca48 -induced reactions with Gd154,Tb159,Dy162 , and Ho165 targets". United States. doi:10.1103/PhysRevC.90.024602.
@article{osti_1392003,
title = {Production cross sections of elements near the N=126 shell in Ca48 -induced reactions with Gd154,Tb159,Dy162 , and Ho165 targets},
author = {Mayorov, D. A. and Werke, T. A. and Alfonso, M. C. and Bennett, M. E. and Folden, C. M.},
abstractNote = {Excitation functions for shell-stabilized evaporation residues produced in 48 Ca -induced reactions with 154 Gd , 159 Tb , 162 Dy , and 165 Ho targets have been measured in experiments performed at the Cyclotron Institute at Texas A&M University. The examined energy range predominantly covers the 3 n and 4 n evaporation channels with higher cross sections measured for the 4 n products. The σ 4 n are nearly invariant within experimental uncertainty in reactions with 159 Tb , 162 Dy , and 165 Ho with the maxima at 12.6 ± 1.9, 12.6 ± 1.7, and 9.4 ± 1.3 mb, respectively. For the reaction with 154 Gd , the maximum is slightly lower at 4.0 ± 0.6 mb. A simple model to describe the measured production cross sections was employed. Capture was estimated by using the “diffused barrier formula” from the “fusion by diffusion” model proposed by Swiatecki et al. [Phys. Rev. C 71, 014602 (2005)]. The fusion probability was estimated by using a phenomenological expression presented by Siwek-Wilczynska et al. [Int. J. Mod. Phys. E 17, 12 (2008)]. The survival probability was calculated according to the formula of Vandenbosch and Huizenga [Nuclear Fission (Academic, New York, 1973)], derived from transition-state theory. The best agreement is reached between calculation and experiment upon inclusion of collective effects in the calculation of the survival probability, shown previously to be important for production of weakly deformed nuclei. This, in turn, challenges the expectation that strong shell stabilization benefits the production cross section. The present data are compared with earlier studies on production of neutron-deficient nuclei in Ca-induced reactions with lanthanide targets.},
doi = {10.1103/PhysRevC.90.024602},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 2,
volume = 90,
place = {United States},
year = {2014},
month = {8}
}

Works referenced in this record:

Entrance-Channel Effects in Suppression of Fusion of Heavy Nuclei
journal, January 2008

  • Siwek-WilczyŃSka, K.; Borowiec, A.; Skwira-Chalot, I.
  • International Journal of Modern Physics E, Vol. 17, Issue 01
  • DOI: 10.1142/S0218301308009501

A program for coupled-channel calculations with all order couplings for heavy-ion fusion reactions
journal, December 1999


Some remarks on the error analysis in the case of poor statistics
journal, February 1984

  • Schmidt, K. -H.; Sahm, C. -C.; Pielenz, K.
  • Zeitschrift f�r Physik A Atoms and Nuclei, Vol. 316, Issue 1
  • DOI: 10.1007/BF01415656

Statistics and Nuclear Reactions
journal, August 1937


Improved charge-state formulas
journal, April 2001

  • Schiwietz, G.; Grande, P. L.
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 175-177
  • DOI: 10.1016/S0168-583X(00)00583-8

Ratios of disintegration rates for distinct decay modes of an excited nucleus
journal, November 2008


Fission hindrance in hot 216 Th : Evaporation residue measurements
journal, August 1999


Synthesis of superheavy nuclei: How accurately can we describe it and calculate the cross sections?
journal, December 2001


Fusion by diffusion. II. Synthesis of transfermium elements in cold fusion reactions
journal, January 2005


Equilibrium configurations of rotating charged or gravitating liquid masses with surface tension. II
journal, February 1974


MARS: A momentum achromat recoil spectrometer
journal, December 1989

  • Tribble, R. E.; Burch, R. H.; Gagliardi, C. A.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 285, Issue 3
  • DOI: 10.1016/0168-9002(89)90215-5

Nuclear Fission
journal, August 1974

  • Vandenbosch, R.; Huizenga, J. R.; Nix, J. R.
  • Physics Today, Vol. 27, Issue 8
  • DOI: 10.1063/1.3128816

Fusion probability of symmetric heavy, nuclear systems determined from evaporation-residue cross sections
journal, August 1985


LISE++: Radioactive beam production with in-flight separators
journal, October 2008

  • Tarasov, O. B.; Bazin, D.
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 266, Issue 19-20
  • DOI: 10.1016/j.nimb.2008.05.110

A SCHEMATIC MODEL FOR ( p , xn ) CROSS SECTIONS IN HEAVY ELEMENTS
journal, August 1956

  • Jackson, J. D.
  • Canadian Journal of Physics, Vol. 34, Issue 8
  • DOI: 10.1139/p56-087

Nuclear Ground-State Masses and Deformations
journal, March 1995

  • Moller, P.; Nix, J. R.; Myers, W. D.
  • Atomic Data and Nuclear Data Tables, Vol. 59, Issue 2, p. 185-381
  • DOI: 10.1006/adnd.1995.1002

Measurement of the fusion probability, P CN , for hot fusion reactions
journal, July 2013


The nuclear droplet model for arbitrary shapes
journal, May 1974


Quasifission processes in Ca 40 , 48 + Sm 144 , 154 reactions
journal, June 2007


Effect of collectivity on the nuclear level density
journal, September 2013


Cross sections for evaporation residue production near theN=126 shell closure
journal, June 1984

  • Vermeulen, D.; Clerc, H. -G.; Sahm, C. -C.
  • Zeitschrift f�r Physik A Atoms and Nuclei, Vol. 318, Issue 2
  • DOI: 10.1007/BF01413464

Attempt to produce element 120 in the Pu 244 + Fe 58 reaction
journal, February 2009


Analysis of fissionability data at high excitation energies: I. The level density problem
journal, June 1981

  • Reisdorf, W.
  • Zeitschrift f�r Physik A: Atoms and Nuclei, Vol. 300, Issue 2-3
  • DOI: 10.1007/BF01412298

Cross section systematics for the lightest Bi and Po nuclei produced in complete fusion reactions with heavy ions
journal, July 2005


Projectile-fragment yields as a probe for the collective enhancement in the nuclear level density
journal, February 1998


Unexpected inhibition of fusion in nucleus–nucleus collisions
journal, September 2001

  • Berriman, A. C.; Hinde, D. J.; Dasgupta, M.
  • Nature, Vol. 413, Issue 6852
  • DOI: 10.1038/35093069

Macroscopic model of rotating nuclei
journal, June 1986


An Experimental Verification of the Theory of Compound Nucleus
journal, December 1950