From quasi-elastic to quasi-compound nucleus reactions induced by a 140 MeV 19F beam bombarding 89Y target nuclei

doi:10.1016/0375-9474(86)90373-8

Nuclear Physics A

Volume 456, Issue 1, 4 August 1986, Pages 186-204

https://doi.org/10.1016/0375-9474(86)90373-8 Get rights and content

Abstract

Various exit channels ranging from ⁶Li to ²⁷Al for the ⁸⁹Y(¹⁹F, x)y reaction have been studied at 140 MeV incident energy. Energy spectra and angular distributions were measured between 10° and 160° laboratory angles. Three different reaction mechanisms were observed: quasi-elastic collisions, deep-inelastic collisions and, with weaker cross sections and longer lifetimes, compound nucleus-like processes.

References (26)

J. Wilczynski
Phys. Lett.
(1973)
A. Artukh et al.
Nucl. Phys.
(1973)
C. Ngô
Notes CEA-N-2354
(1983)
T. Suomijärvi et al.
Z. Phys. A
(1985)
C. Olmer et al.
Phys. Rev.
(1978)
V.V. Volkov
C.K. Gelbke et al.
Phys. Reports
(1978)
J. Barrette et al.
Nucl. Phys.
(1977)
G. Guillaume et al.
Phys. Rev.
(1982)
B. Heusch et al.
Z. Phys.
(1983)
J.P. Coffin et al.
Phys. Rev.
(1984)

B. Heusch et al.

Z. Phys.

(1985)

B. Heusch

M.J. Murphy et al.

Phys. Lett.

(1984)

Cited by (25)

Nuclear Data Sheets for A = 89
2013, Nuclear Data Sheets
The evaluated experimental data are presented for 14 known nuclides of mass 89 (Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh). New data on high–spin excitations are available for ⁸⁹Kr, ⁸⁹Rb, ⁸⁹Sr, ⁸⁹Tc and ⁸⁹Ru, including a superdeformed structure in ⁸⁹Tc. Fluorescence studies in ⁸⁹Y have revealed a large number of new levels in 7–11 MeV range. New two–neutron transfer data are available for ⁸⁹Zr. New direct and precise measurement of atomic masses of ⁸⁹Se, ⁸⁹Br, 89^Kr, ⁸⁹Rb, ⁸⁹Mo and ⁸⁹Tc have greatly improved the Q value landscape in this mass region. This work supersedes previous A=89 evaluation published in 1998Si31, and also the older ones 1989Si20, 1975Ko21, and M.W. Johns et al., Nuclear Data Tables A 8, 373 (1970).
In spite of extensive experimental work on the isobaric nuclei of this mass chain several deficiencies remain. The identification of ⁸⁹Rh isotope remains unconfirmed. The half–lives of ground states of ⁸⁹Ge, ⁸⁹As and ⁸⁹Rh have not been measured, only the lower limits are estimated from time–of–flight in a reaction and experimental arrangement, where produced and identified. The decay schemes of ⁸⁹Ge, ⁸⁹As, ⁸⁹Se, ⁸⁹Ru and ⁸⁹Rh are not known, and those for ⁸⁹Tc and ⁸⁹Mo are incomplete. High–lying (neutron unbound) levels in ⁸⁹Kr, expected to be populated in the decay of ⁸⁹Br, have not been investigated. The spins and parities for levels in ⁸⁹Kr are largely unassigned, while for ⁸⁹Tc and ⁸⁹Ru, only few low–spin excitations are established. For ⁸⁹Rb, little information is available for high–spin structures. Detailed gamma–ray data are available for ⁸⁸Sr(n,γ)⁸⁹Sr reaction, but most of these γ rays remain unassigned in a level scheme. Excited state data are nonexistent for ⁸⁹Ge, ⁸⁹As, ⁸⁹Se, ⁸⁹Br and ⁸⁹Rh. The ⁸⁹Y and ⁸⁹Zr are the most extensively studied nuclei in A=89.
Compound and non-compound nucleus contributions in the evaporation residue cross-sections of 20Ne + 181Ta → 201Bi * reaction at E <inf>c.m.</inf>=135MeV and 162 MeV
2012, Nuclear Physics A
The simultaneous existence of Compound Nucleus (CN) and Non-Compound Nucleus (NCN) processes in the decay of a nuclear system, provide a comprehensive picture of nuclear reaction dynamics and related phenomenon in low energy region. The CN and NCN based Evaporation Residue (ER) cross-section data is available for ²⁰Ne + ¹⁸¹Ta → ²⁰¹Bi^⁎ reaction at two energies i.e. $E_{lab} = 150 MeV$ and $E_{lab} = 180 MeV$ , and the same is tested in the framework of Dynamical Cluster Decay Model (DCM). Experimentally, the NCN component is reported to have major contribution from Incomplete Fusion (ICF) channel and the Deep Inelastic Collision (DIC) component is shown to be negligibly small. The ER formed in CN and NCN (ICF in present case) are nicely reproduced in the framework of DCM. The available CN based ER cross-sections are fitted for spherical, $β_{2}$ deformed and $β_{2}$ – $β_{4}$ deformed fragmentation paths, which in turn provide a nice description of deformation effects in the decay of ²⁰¹Bi^⁎ formed in ²⁰Ne induced reaction. The role of barrier modification and angular momentum dependence is also addressed in addition to deformation and orientation effects.
Nuclear data sheets for A = 89
1998, Nuclear Data Sheets
The evaluated experimental data are presented for 14 known nuclides of mass 89 (Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh). Excited state data are nonexistent for⁸⁹Ge,⁸⁹As,⁸⁹Se,⁸⁹Br,⁸⁹Ru, and⁸⁹Br. High-spin excitations are known for⁸⁹Sr,⁸⁹Y,⁸⁹Zr,⁸⁹Nb,⁸⁹Mo and⁸⁹Tc; neutron capture ;gg-ray data are available for⁸⁹Sr (neutrons at thermal energy); and particle-transfer data exist for⁸⁹Rb,⁸⁹Sr,⁸⁹Y,⁸⁹Nb and⁸⁹Mo. This work supersedes earlier A = 89 Nuclear Data Sheets (89Si20, 75Ko21).
Energy and angular correlations in heavy-ion deep inelastic collisions
1994, Nuclear Physics, Section A
Energy levels of light nuclei A = 16-17
1993, Nuclear Physics, Section A
Macroscopic quasimolecules in dissipative heavy-ion collisions
1991, Physics Letters B
Long-range quasiperiodic correlations in fluctuating excitation functions of dissipative heavy-ion collisions are obtained from a pole representation for the S-matrix elements. The time power spectra of a decaying dinuclear system shows a time-orientation localization as if it rotates like a classical object. This allows one to interpret tthe correlations in terms of the formation of specific nuclear macroscopic quasimolecular states. The data gives support to the existence of macroscopic quasimolecules.

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Nuclear Physics A

Abstract

References (26)

Phys. Lett.

Nucl. Phys.

Notes CEA-N-2354

Z. Phys. A

Phys. Rev.

Phys. Reports

Nucl. Phys.

Phys. Rev.

Z. Phys.

Phys. Rev.

Z. Phys.

Phys. Lett.

Cited by (25)

Nuclear Data Sheets for A = 89

Compound and non-compound nucleus contributions in the evaporation residue cross-sections of <sup>20</sup>Ne + <sup>181</sup>Ta → <sup>201</sup>Bi <sup>*</sup> reaction at E <inf>c.m.</inf>=135MeV and 162 MeV

Nuclear data sheets for A = 89

Energy and angular correlations in heavy-ion deep inelastic collisions

Energy levels of light nuclei A = 16-17

Macroscopic quasimolecules in dissipative heavy-ion collisions