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Giant resonances and bound collective states observed in the scattering of 92.5-MeV electrons from the closed-neutron-shell nucleus Y89 between excitation energies from 2.0 to 55 MeV

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Author
Pitthan, R.
Buskirk, F.R.
Dally, E.B.
Shannon, J.O.
Smith, W.H.
Date
1977-09
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Abstract
92.5 MeV electrons were used to study in (89)Y the excitation range between 2 and 55 MeV. Above neutron threshold, broad electric resonances have been seen at 14.0 (63A(-1/3) MeV (E2, vT = 0) and 28 (125A-(1/3) MeV (E2, vT = 1). The total width of the isoscalar E2 resonance is (4.5 +/-0.4) MeV and its strength (56 =/- 6) % energy-weighted sum rule (E2, vT = 0). For the isovector E2 resonance only a minimal value of 7 MeV for the width can be given which is connected with (48 +/- 5)% of the isovector sum rule. The strength of the E1 resonance [T>7(104 =/- 10)% of the Thomas-Reiche-Kuhn sum rule] agrees well with (y,n) measurements, thus giving a check for the accuracy of the evaluating methods employed. A structure around 19-20 MeV, believed to be the T> part of the giant dipole resonance, carries (8 +/- 3)% of the E1 sum rule. In addition to these generally well known states, clustering of E3 strength, (13 +/- 2)% energy-weighted sum rule (E3, vT = 0), was found at 6.75 and 80.5 MeV; the enveloping line shape of these clusters was best described by a Breit-Wigner term. Other concentrations of strength include E3 at 2.6 MeV, (15 +/-3)% energy-weighted sum rule E3, (vT = 0), E2 at 4.0 MeV, (11 +/- 3)% energy-weighted sum rule (E2, vT = 0), and E3 strength at 13.5 MeV. No resonance other than the E1 was found around 17 MeV, thus ruling out in (89)Y the existence of a monopole state with 100% sum rule proposed for (90)Zr from (a,a') and (e,e') measurements. In contrast to heavy nuclei, no resonant 3hw E3 strength could be located.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/47513
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    Giant multipole resonances in the deformed fissionable nucleus 238U 

    Pitthan, R.; Buskirk, F.R.; Houk, W.A.; Moore, R.W. (American Physical Society, 1980-01);
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    Giant multipole resonances in the deformed fissionable nucleus 238U: breakdown of the hydrodynamical models? 

    Pitthan, R.; Buskirk, F.R.; Houk, W.A.; Moore, R.W. (Monterey, California. Naval Postgraduate School, 1980);
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    E0, El, E2, E3, and E4 giant resonances in the N = 82 nucleus (140) Ce between 4 and 48 MeV excitation energy with inelastic electron scattering 

    Pitthan, R.; Hass, H.; Meyer, D.H.; Buskirk, F.R.; Dyer, J.N. (American Physical Society, 1979-04);
    The cross section for electron scattering from natural cerium (89% 14°Ce) has been measured with electrons of 80 and 92 MeV at 90 and 105° between 4 and 48 MeV excitation energy. The nine resonances ...
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