Evaporation residue cross sections and average neutron multiplicities in the 64Ni+92Zr and 12C+144Sm reactions leading to 156Er

R. V.F. Janssens; R. Holzmann; W. Henning; T. L. Khoo; K. T. Lesko; G. S.F. Stephans; D. C. Radford; A. M. Van Den Berg; W. Kühn; R. M. Ronningen

doi:10.1016/0370-2693(86)91245-1

Evaporation residue cross sections and average neutron multiplicities in the ⁶⁴Ni+⁹²Zr and ¹²C+¹⁴⁴Sm reactions leading to ¹⁵⁶Er

R. V.F. Janssens, R. Holzmann, W. Henning, T. L. Khoo, K. T. Lesko, G. S.F. Stephans, D. C. Radford, A. M. Van Den Berg, W. Kühn, R. M. Ronningen

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Abstract

Evaporation residue cross sections and neutron multiplicity distributions have been measured for the ¹²C + ¹⁴⁴Sm and ⁶⁴Ni + ⁹²Zr reactions leading to the same compound nucleous ¹⁵⁶Er. Statistical model calculations can account for the data in the ¹²C-induced reaction. In contrast, the inhibition of neutron emission with respect to statistical model predictions seen in ⁶⁴Ni + ⁹²Zr cannot be explained even with the inclusion of the broad angular momentum distributions required to describe the fusion cross section data.

Original language	English
Pages (from-to)	16-20
Number of pages	5
Journal	Physics Letters B
Volume	181
Issue number	1-2
DOIs	https://doi.org/10.1016/0370-2693(86)91245-1
State	Published - Nov 27 1986
Externally published	Yes

Funding

Significant deviations between experiment and statistical model predictions have been observed for the number of nucleons emitted following certain heavy-ion induced fusion reactions \[1 -3\]. At present, there is no unambiguous explanation for the apparent inhibition of particle emission and more experimental data are needed. In this letter the formation and subsequent decay of the compound nucleous 156Er, where such effects have been observed \[1\]i,s studied in the 12C + 144Sm and 64Ni + 92Zr reactions. Fusion 1 Present address: GSI, D-6100 Darmstadt 11, Fed. Rep. Germany. 2 Present address: LBL, Berkeley, CA 94720, USA. 3 Present address: MIT, Cambridge, MA 02139, USA. 4 Present address: AECL, Chalk River, Ontario, Canada. s Present address: Fysisch Laboratorium, Rijksuniversiteit Utrecht, Utrecht, The Netherlands. 6 Work supported by the US Department of Energy, Nuclear Physics Division, under Contract W-31-109-ENG-38.

Funders	Funder number
Nuclear Physics Division	W-31-109-ENG-38
US Department of Energy

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Janssens, R. V. F., Holzmann, R., Henning, W., Khoo, T. L., Lesko, K. T., Stephans, G. S. F., Radford, D. C., Van Den Berg, A. M., Kühn, W., & Ronningen, R. M. (1986). Evaporation residue cross sections and average neutron multiplicities in the ⁶⁴Ni+⁹²Zr and ¹²C+¹⁴⁴Sm reactions leading to ¹⁵⁶Er. Physics Letters B, 181(1-2), 16-20. https://doi.org/10.1016/0370-2693(86)91245-1

@article{bef2a67706004d9e8a5c87b1a323b09b,

title = "Evaporation residue cross sections and average neutron multiplicities in the 64Ni+92Zr and 12C+144Sm reactions leading to 156Er",

abstract = "Evaporation residue cross sections and neutron multiplicity distributions have been measured for the 12C + 144Sm and 64Ni + 92Zr reactions leading to the same compound nucleous 156Er. Statistical model calculations can account for the data in the 12C-induced reaction. In contrast, the inhibition of neutron emission with respect to statistical model predictions seen in 64Ni + 92Zr cannot be explained even with the inclusion of the broad angular momentum distributions required to describe the fusion cross section data.",

author = "Janssens, {R. V.F.} and R. Holzmann and W. Henning and Khoo, {T. L.} and Lesko, {K. T.} and Stephans, {G. S.F.} and Radford, {D. C.} and {Van Den Berg}, {A. M.} and W. K{\"u}hn and Ronningen, {R. M.}",

year = "1986",

month = nov,

day = "27",

doi = "10.1016/0370-2693(86)91245-1",

language = "English",

volume = "181",

pages = "16--20",

journal = "Physics Letters B",

issn = "0370-2693",

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number = "1-2",

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TY - JOUR

T1 - Evaporation residue cross sections and average neutron multiplicities in the 64Ni+92Zr and 12C+144Sm reactions leading to 156Er

AU - Janssens, R. V.F.

AU - Holzmann, R.

AU - Henning, W.

AU - Khoo, T. L.

AU - Lesko, K. T.

AU - Stephans, G. S.F.

AU - Radford, D. C.

AU - Van Den Berg, A. M.

AU - Kühn, W.

AU - Ronningen, R. M.

PY - 1986/11/27

Y1 - 1986/11/27

N2 - Evaporation residue cross sections and neutron multiplicity distributions have been measured for the 12C + 144Sm and 64Ni + 92Zr reactions leading to the same compound nucleous 156Er. Statistical model calculations can account for the data in the 12C-induced reaction. In contrast, the inhibition of neutron emission with respect to statistical model predictions seen in 64Ni + 92Zr cannot be explained even with the inclusion of the broad angular momentum distributions required to describe the fusion cross section data.

AB - Evaporation residue cross sections and neutron multiplicity distributions have been measured for the 12C + 144Sm and 64Ni + 92Zr reactions leading to the same compound nucleous 156Er. Statistical model calculations can account for the data in the 12C-induced reaction. In contrast, the inhibition of neutron emission with respect to statistical model predictions seen in 64Ni + 92Zr cannot be explained even with the inclusion of the broad angular momentum distributions required to describe the fusion cross section data.

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U2 - 10.1016/0370-2693(86)91245-1

DO - 10.1016/0370-2693(86)91245-1

M3 - Article

AN - SCOPUS:0001779666

SN - 0370-2693

VL - 181

SP - 16

EP - 20

JO - Physics Letters B

JF - Physics Letters B

IS - 1-2

ER -

Evaporation residue cross sections and average neutron multiplicities in the ⁶⁴Ni+⁹²Zr and ¹²C+¹⁴⁴Sm reactions leading to ¹⁵⁶Er

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