Proton particle-hole states in 208Pb

doi:10.1016/0375-9474(87)90111-4

Nuclear Physics A

Volume 469, Issue 2, 27 July 1987, Pages 285-312

https://doi.org/10.1016/0375-9474(87)90111-4 Get rights and content

Abstract

Differential cross sections for the ²⁰⁹Bi(d, ³He)²⁰⁸Pb transitions to the proton particle-proton hole states in ²⁰⁸Pb were obtained with the 45 MeV analyzed deuteron beam from the JULIC cyclotron and the high resolution spectrograph BIG KARL. 72 states up to 6.6 MeV were studied with an overall resolution of 12 to 15keV. Spectroscopic factors were extracted relative to the simultaneously measured calibration reaction ²⁰⁸Pb(d, ³He)²⁰⁷Tl. For 26 states new parity assignments were possible on the basis of the measured angular distributions. The deduced inclusion into one of the four multiplets put limits on the possible spins of the states in question. With the help of sum rule arguments the spins of 12 states were assigned. The comparison with shell model calculations give only rough agreement as they predict the energies of the respective states about 300 keV too high. The magnetic dipole state at 5.846 MeV was observed with a Spectroscopic factor C²S = 0.17. From this, together with the transition probability B(M1↑) = (1.6 ± 0.5) μ_N² from a $(γ, γ′)$ experiment we derived size and relative sign of the dominant neutron and proton spin-flip amplitudes. The result gives clear evidence for the isoscalar character of this state in accordance wtih TDA and RPA predictions. The matrix elements of the two-body residual interaction were derived unambiguously for the $h_{92} ∗ s_{12} and h_{92} ∗ d_{32}$ multiplets. For the $h_{92} ∗ h_{112}$ and $h_{92} ∗ d_{52}$ multiplets uncertainties are larger because of assumptions of some of the spins for the states of high excitation energy. The four monopole terms are found close to the average of −308 keV. They are dominated by the Coulomb contributions of ≈ − 216 keV. The deduced J-dependence of the matrix elements differs from those found in other systematic investigations indicating more complicated underlying nuclear forces must contribute.

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¹: Supported in part by the German Federal Minister for Research and Technology (BMFT) under contract 06 TUE 460/1.

²: On leave, present address: IUCF, Bloomington.

³: Present address: ZAM, KFA Jülich.

⁴: Present address: Instituto de Fisica Corpuscular, Dr. Moliner 50 Burjassot, Valencia, Spain.

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Proton particle-hole states in 208Pb

Abstract

Phys. Rev.

Phys. Lett.

Lett. Nuovo Cim.

Phys. Rev. Lett.

Nucl. Phys.

Nucl. Phys.

Bull. Amer. Phys. Soc.

Bull. Amer. Phys. Soc.

Phys. Rev.

Phys. Rev. Lett.

Phys. Rev.

Phys. Rev.

Ann. Phys.

Rev. Mod. Phys.

Phys. Reports

Nucl. Instr. Meth.

Phys. Rev.

Nucl. Phys.

Z. Phys.

J. Phys.

Nucl. Data sheets

doctoral thesis

Phys. Rev.

Phys. Rev.

Phys. Rev. Lett.

Phys. Rev. Lett.

Phys. Rev.

Phys. Rev. Lett.

Phys. Rev. Lett.

Phys. Lett.

Phys. Lett.

Phys. Lett.

Bull. Amer. Phys. Soc.

Proton particle-hole states in ²⁰⁸Pb