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Title: Precision lifetime measurements of the first 2{sup +} and 4{sup +} states in {sup 56}Cr at the N=32 subshell closure

Abstract

Excited states in {sup 56}Cr have been populated after {sup 48}Ca({sup 11}B,p2n) reactions at a beam energy of 32 MeV. The Cologne plunger device surrounded by a {gamma}-detector array of one EUROBALL cluster detector and five Ge detectors was employed to determine lifetimes with the recoil distance Doppler shift method. {gamma}{gamma}-coincidence data were analyzed using the differential decay curve method and precise lifetimes for the first 2{sup +} and 4{sup +} state of {tau}=5.49(14) ps and {tau}=3.15(11) ps, respectively, were extracted. The corresponding B(E2; 2{sup +}{yields}0{sup +})=11.33(31) W.u. quantifies with a high accuracy the puzzling discrepancy between experimental B(E2) values in N=32 isotones and theoretical results from large-scale shell model calculations employing modern effective nucleon-nucleon interactions.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [1];  [2];  [1];  [3]; more »;  [4];  [1];  [5] « less
  1. Institut fuer Kernphysik, Universitaet zu Koeln, D-50937 Koeln (Germany)
  2. (Germany)
  3. (France)
  4. GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany)
  5. (United States)
Publication Date:
OSTI Identifier:
21596749
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.84.034318; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BEAMS; BORON 11 REACTIONS; CALCIUM 48 TARGET; CHROMIUM 56; DOPPLER EFFECT; EXCITED STATES; GE SEMICONDUCTOR DETECTORS; ISOTONIC NUCLEI; LIFETIME; MEV RANGE 10-100; NUCLEON-NUCLEON INTERACTIONS; RECOILS; SHELL MODELS; BARYON-BARYON INTERACTIONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CHROMIUM ISOTOPES; ENERGY LEVELS; ENERGY RANGE; EVEN-EVEN NUCLEI; HADRON-HADRON INTERACTIONS; HEAVY ION REACTIONS; INTERACTIONS; INTERMEDIATE MASS NUCLEI; ISOTOPES; MATHEMATICAL MODELS; MEASURING INSTRUMENTS; MEV RANGE; MINUTES LIVING RADIOISOTOPES; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; PARTICLE INTERACTIONS; RADIATION DETECTORS; RADIOISOTOPES; SEMICONDUCTOR DETECTORS; TARGETS

Citation Formats

Seidlitz, M., Reiter, P., Dewald, A., Christen, S., Finke, F., Fransen, C., Holler, A., Kotthaus, T., Melon, B., Muecher, D., Regis, J.-M., Saha, B., von Brentano, P., Wiens, A., Zell, K. O., Moeller, O., Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt, Bruyneel, B., CEA Saclay, Service de Physique Nucleaire, F-91191 Gif-sur-Yvette, Gorska, M., Grawe, H., Ilie, G., and Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511. Precision lifetime measurements of the first 2{sup +} and 4{sup +} states in {sup 56}Cr at the N=32 subshell closure. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.034318.
Seidlitz, M., Reiter, P., Dewald, A., Christen, S., Finke, F., Fransen, C., Holler, A., Kotthaus, T., Melon, B., Muecher, D., Regis, J.-M., Saha, B., von Brentano, P., Wiens, A., Zell, K. O., Moeller, O., Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt, Bruyneel, B., CEA Saclay, Service de Physique Nucleaire, F-91191 Gif-sur-Yvette, Gorska, M., Grawe, H., Ilie, G., & Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511. Precision lifetime measurements of the first 2{sup +} and 4{sup +} states in {sup 56}Cr at the N=32 subshell closure. United States. doi:10.1103/PHYSREVC.84.034318.
Seidlitz, M., Reiter, P., Dewald, A., Christen, S., Finke, F., Fransen, C., Holler, A., Kotthaus, T., Melon, B., Muecher, D., Regis, J.-M., Saha, B., von Brentano, P., Wiens, A., Zell, K. O., Moeller, O., Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt, Bruyneel, B., CEA Saclay, Service de Physique Nucleaire, F-91191 Gif-sur-Yvette, Gorska, M., Grawe, H., Ilie, G., and Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511. Thu . "Precision lifetime measurements of the first 2{sup +} and 4{sup +} states in {sup 56}Cr at the N=32 subshell closure". United States. doi:10.1103/PHYSREVC.84.034318.
@article{osti_21596749,
title = {Precision lifetime measurements of the first 2{sup +} and 4{sup +} states in {sup 56}Cr at the N=32 subshell closure},
author = {Seidlitz, M. and Reiter, P. and Dewald, A. and Christen, S. and Finke, F. and Fransen, C. and Holler, A. and Kotthaus, T. and Melon, B. and Muecher, D. and Regis, J.-M. and Saha, B. and von Brentano, P. and Wiens, A. and Zell, K. O. and Moeller, O. and Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt and Bruyneel, B. and CEA Saclay, Service de Physique Nucleaire, F-91191 Gif-sur-Yvette and Gorska, M. and Grawe, H. and Ilie, G. and Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511},
abstractNote = {Excited states in {sup 56}Cr have been populated after {sup 48}Ca({sup 11}B,p2n) reactions at a beam energy of 32 MeV. The Cologne plunger device surrounded by a {gamma}-detector array of one EUROBALL cluster detector and five Ge detectors was employed to determine lifetimes with the recoil distance Doppler shift method. {gamma}{gamma}-coincidence data were analyzed using the differential decay curve method and precise lifetimes for the first 2{sup +} and 4{sup +} state of {tau}=5.49(14) ps and {tau}=3.15(11) ps, respectively, were extracted. The corresponding B(E2; 2{sup +}{yields}0{sup +})=11.33(31) W.u. quantifies with a high accuracy the puzzling discrepancy between experimental B(E2) values in N=32 isotones and theoretical results from large-scale shell model calculations employing modern effective nucleon-nucleon interactions.},
doi = {10.1103/PHYSREVC.84.034318},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}