Universität zu Köln

Heusler, A., Faestermann, T., Hertenberger, R., Wirth, H. -F. and von Brentano, P. (2014). Determining the strength of undetectable particle-hole configurations by complete spectroscopy of negative parity states in Pb-208. Phys. Rev. C, 89 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

In the doubly magic nucleus Pb-208, many states contain fractions of particle-hole configurations whose strength can be determined from experiment. However, some configurations are not excited in a directly detectable way. Their strengths can be determined by observing an ensemble of states which consists entirely of an equivalent set of configurations with a given spin and parity among which only one or two configurations are not detected. Examples for spins 2(-)-5(-) are evaluated. Excitation energies of states in Pb-208 are determined with a precision down to 100 eV by experiments on the Pb-208(p, p') and Pb-207(d, p) reactions with the Q3D magnetic spectrograph (Maier-Leibnitz-Laboratorium, Garching, Germany). Six doublets with distances between the states of less than 2 keV are resolved. 72 negative parity states below E-x = 6.1 MeV are identified. They correspond to 70 states predicted by the schematic shell model without residual interaction below E-x = 6361 keV. The 1(-) and 3(-) yrast states appear in addition. Six new spins are assigned to negative parity states, three new spins to positive parity states, and two spins suggested by the Nuclear Data Sheets are verified. The state at E-x = 4953 keV is identified as the 3(+) member of the configuration g(9/2)i(13/2). Among about hundred states, the configuration mixing for unnatural parity is shown to be less than for natural parity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Heusler, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Faestermann, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hertenberger, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wirth, H. -F. UNSPECIFIED UNSPECIFIED UNSPECIFIED von Brentano, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-445649
DOI:	10.1103/PhysRevC.89.024322
Journal or Publication Title:	Phys. Rev. C
Volume:	89
Number:	2
Date:	2014
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1089-490X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ANALOG RESONANCES; EXCITED-STATES; PROTON-DECAY; PB-207(D,P)PB-208; ENERGIES; WIDTHS; 208PB Multiple languages Physics, Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44564