Universität zu Köln

Petkov, P., Mueller-Gatermann, C., Werner, D., Dewald, A., Blazhev, A., Fransen, C., Jolie, J., Ohkubo, S. and Zell, K. O. (2019). New lifetime measurements for the lowest quadrupole states in Ne-20,(22) and possible explanations of the high collectivity of the depopulating E2 transitions. Phys. Rev. C, 100 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Shell model and multiparticle-multihole configuration-mixing calculations indicate a missing quadrupole collectivity needed to explain the transition strengths in the even-even Ne isotopes. Even with a significant scaling of the effective charges all details of the data cannot be reproduced. The effect is very pronounced in Ne-20(,22). Therefore new lifetime measurements in these nuclei were undertaken by us with the Doppler-shift attenuation method to recheck experimentally earlier findings. They confirmed the previous result in the case of Ne-20 while in Ne-22 the 2(1)(+) level lifetime was found to be shorter by 43%. It turned out that in the latter nucleus the lifetime of the 4(1)(+) level also has to be corrected. The B(E2;2(1)(+)-> 0(1)(+)) reduced transition strengths derived from the newly determined lifetimes as well as those for the heavier Ne isotopes are reasonably described by involving a mixing of a-cluster states of, e.g., the type alpha circle times 16O with normal, nearly spherical states. An extended version of the coupled-cluster effective interaction method published earlier describes well the spin dependence of the B(E2)'s in Ne-20.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Petkov, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller-Gatermann, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Werner, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dewald, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Blazhev, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fransen, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jolie, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ohkubo, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zell, K. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-144567
DOI:	10.1103/PhysRevC.100.024312
Journal or Publication Title:	Phys. Rev. C
Volume:	100
Number:	2
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9993
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NUCLEAR-DATA SHEETS; DECAY CURVE METHOD; ALPHA-CLUSTER STRUCTURE; COULOMB-EXCITATION; NE-22; NA-22; P-30; PLUNGER; ENERGY; BAND Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14456