Multiplicities for evaporative4He emission in heavy ion reactions: Relationships to spin and lifetime expectancy of the composite nucleus

N. N. Ajitanand; John M. Alexander; H. Delagrange; E. Duek; D. Eriksen; D. Guerreau; Morton Kaplan; M. Kildir; L. Kowalski; R. Lacey; D. Logan; D. J. Moses; G. F. Peaslee; Louis C. Vaz; M. S. Zisman

doi:10.1007/BF01412259

Multiplicities for evaporative⁴He emission in heavy ion reactions: Relationships to spin and lifetime expectancy of the composite nucleus

N. N. Ajitanand
, John M. Alexander
, H. Delagrange
, E. Duek
, D. Eriksen
, D. Guerreau
, Morton Kaplan
, M. Kildir
, L. Kowalski
, R. Lacey
, D. Logan
, D. J. Moses
, G. F. Peaslee
, Louis C. Vaz
, M. S. Zisman

Chemistry

Stony Brook University
Carnegie Mellon University
Montclair State University
Lawrence Berkeley National Laboratory

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Multiplicities are compared for⁴He evaporation in reactions of⁴⁰Ar and⁵⁶Fe projectiles (8.5 MeV/u) with with^natAg and²³⁸U targets. Coincidence requirements involving fusion-fission and projectile-like fragments have been used to select separate entrance-channel spin zones. Evaporation-like⁴He emission from the composite nuclei is shown to be large for mean spins ≦100ℏ, and to decrease dramatically with increasing spin. Coincidence measurements between two⁴He particles have also been studied for⁴⁰Ar+^natAg. This requirement is shown to select reactions that lead to evaporation residues and therefore to a zone of relatively low spin. The shapes of the⁴He spectra provide an interesting probe of the mechanism and also of the thermodynamic properties of hot nuclei.

Original language	English
Pages (from-to)	169-176
Number of pages	8
Journal	European Physical Journal A
Volume	316
Issue number	2
DOIs	https://doi.org/10.1007/BF01412259
State	Published - Jun 1984

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Ajitanand, N. N., Alexander, J. M., Delagrange, H., Duek, E., Eriksen, D., Guerreau, D., Kaplan, M., Kildir, M., Kowalski, L., Lacey, R., Logan, D., Moses, D. J., Peaslee, G. F., Vaz, L. C., & Zisman, M. S. (1984). Multiplicities for evaporative⁴He emission in heavy ion reactions: Relationships to spin and lifetime expectancy of the composite nucleus. European Physical Journal A, 316(2), 169-176. https://doi.org/10.1007/BF01412259

@article{3ddcfe5d7dfa4cfb850a700db88b5e3b,

title = "Multiplicities for evaporative4He emission in heavy ion reactions: Relationships to spin and lifetime expectancy of the composite nucleus",

abstract = "Multiplicities are compared for4He evaporation in reactions of40Ar and56Fe projectiles (8.5 MeV/u) with withnatAg and238U targets. Coincidence requirements involving fusion-fission and projectile-like fragments have been used to select separate entrance-channel spin zones. Evaporation-like4He emission from the composite nuclei is shown to be large for mean spins ≦100ℏ, and to decrease dramatically with increasing spin. Coincidence measurements between two4He particles have also been studied for40Ar+natAg. This requirement is shown to select reactions that lead to evaporation residues and therefore to a zone of relatively low spin. The shapes of the4He spectra provide an interesting probe of the mechanism and also of the thermodynamic properties of hot nuclei.",

author = "Ajitanand, \{N. N.\} and Alexander, \{John M.\} and H. Delagrange and E. Duek and D. Eriksen and D. Guerreau and Morton Kaplan and M. Kildir and L. Kowalski and R. Lacey and D. Logan and Moses, \{D. J.\} and Peaslee, \{G. F.\} and Vaz, \{Louis C.\} and Zisman, \{M. S.\}",

year = "1984",

month = jun,

doi = "10.1007/BF01412259",

language = "English",

volume = "316",

pages = "169--176",

journal = "European Physical Journal A",

issn = "1434-6001",

number = "2",

}

Ajitanand, NN, Alexander, JM, Delagrange, H, Duek, E, Eriksen, D, Guerreau, D, Kaplan, M, Kildir, M, Kowalski, L, Lacey, R, Logan, D, Moses, DJ, Peaslee, GF, Vaz, LC & Zisman, MS 1984, 'Multiplicities for evaporative⁴He emission in heavy ion reactions: Relationships to spin and lifetime expectancy of the composite nucleus', European Physical Journal A, vol. 316, no. 2, pp. 169-176. https://doi.org/10.1007/BF01412259

TY - JOUR

T1 - Multiplicities for evaporative4He emission in heavy ion reactions

T2 - Relationships to spin and lifetime expectancy of the composite nucleus

AU - Ajitanand, N. N.

AU - Alexander, John M.

AU - Delagrange, H.

AU - Duek, E.

AU - Eriksen, D.

AU - Guerreau, D.

AU - Kaplan, Morton

AU - Kildir, M.

AU - Kowalski, L.

AU - Lacey, R.

AU - Logan, D.

AU - Moses, D. J.

AU - Peaslee, G. F.

AU - Vaz, Louis C.

AU - Zisman, M. S.

PY - 1984/6

Y1 - 1984/6

N2 - Multiplicities are compared for4He evaporation in reactions of40Ar and56Fe projectiles (8.5 MeV/u) with withnatAg and238U targets. Coincidence requirements involving fusion-fission and projectile-like fragments have been used to select separate entrance-channel spin zones. Evaporation-like4He emission from the composite nuclei is shown to be large for mean spins ≦100ℏ, and to decrease dramatically with increasing spin. Coincidence measurements between two4He particles have also been studied for40Ar+natAg. This requirement is shown to select reactions that lead to evaporation residues and therefore to a zone of relatively low spin. The shapes of the4He spectra provide an interesting probe of the mechanism and also of the thermodynamic properties of hot nuclei.

AB - Multiplicities are compared for4He evaporation in reactions of40Ar and56Fe projectiles (8.5 MeV/u) with withnatAg and238U targets. Coincidence requirements involving fusion-fission and projectile-like fragments have been used to select separate entrance-channel spin zones. Evaporation-like4He emission from the composite nuclei is shown to be large for mean spins ≦100ℏ, and to decrease dramatically with increasing spin. Coincidence measurements between two4He particles have also been studied for40Ar+natAg. This requirement is shown to select reactions that lead to evaporation residues and therefore to a zone of relatively low spin. The shapes of the4He spectra provide an interesting probe of the mechanism and also of the thermodynamic properties of hot nuclei.

UR - https://www.scopus.com/pages/publications/0002171806

U2 - 10.1007/BF01412259

DO - 10.1007/BF01412259

M3 - Article

AN - SCOPUS:0002171806

SN - 1434-6001

VL - 316

SP - 169

EP - 176

JO - European Physical Journal A

JF - European Physical Journal A

IS - 2

ER -

Multiplicities for evaporative⁴He emission in heavy ion reactions: Relationships to spin and lifetime expectancy of the composite nucleus

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