Braunroth, Thomas, Dewald, A., Iwasaki, H., Lenzi, S. M., Albers, M., Bader, V. M., Baugher, T., Baumann, T., Bazin, D., Berryman, J. S., Fransen, C., Gade, A., Ginter, T., Gottardo, A., Hackstein, M., Jolie, J., Lemasson, A., Litzinger, J., Lunardi, S., Marchi, T. ORCID: 0000-0001-7339-8185, Modamio, V., Morse, C., Napoli, D. R., Nichols, A., Recchia, F., Stroberg, S. R., Wadsworth, R., Weisshaar, D., Whitmore, K. and Wimmer, K. (2015). Reduced transition strengths of low-lying yrast states in chromium isotopes in the vicinity of N=40. Phys. Rev. C, 92 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

Background: In neutron-rich nuclei around N = 40 rapid changes in nuclear structure can be observed. While Ni-68 exhibits signatures of a doubly magic nucleus, experimental data along the isotopic chains in even more exotic Fe and Cr isotopes-such as excitation energies and transition strengths-suggest a sudden rise in collectivity toward N = 40. Purpose: Reduced quadrupole transition strengths for low-lying transitions in neutron-rich Cr-58,Cr-60,Cr-62 are investigated. This gives quantitative new insights into the evolution of quadrupole collectivity in the neutron-rich region close to N = 40. Method: The recoil distance Doppler-shift (RDDS) technique was applied to measure lifetimes of low-lying states in Cr-58,Cr-60,Cr-62. The experiment was carried out at the National Superconducting Cyclotron Laboratory (NSCL) with the SeGA array in a plunger configuration coupled to the S800 magnetic spectrograph. The states of interest were populated by means of one-proton knockout reactions. Results: Data reveal a rapid increase in quadrupole collectivity for Cr-58,Cr-60,Cr-62 toward N = 40 and point to stronger quadrupole deformations compared to neighboring Fe isotopes. The experimental B(E2) values are reproduced well with state-of-the-art shell-model calculations using the LNPS effective interaction. A consideration of intrinsic quadrupole moments and B-42 ratios suggest an evolution toward a rotational nature of the collective structures in Cr-60,Cr-62. Compared to Cr-58, experimental B-42 and B-62 values for Cr-60 are in better agreement with the E(5) limit. Conclusion: Our results indicate that collective excitations in neutron-rich Cr isotopes saturate at N = 38, which is in agreement with theoretical predictions. More detailed experimental data of excited structures and interband transitions are needed for a comprehensive understanding of quadrupole collectivity close to N = 40. This calls for additional measurements in neutron-rich Cr and neighboring Ti and Fe nuclei.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Braunroth, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dewald, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Iwasaki, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lenzi, S. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Albers, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bader, V. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baugher, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baumann, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bazin, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Berryman, J. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fransen, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gade, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ginter, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gottardo, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hackstein, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jolie, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lemasson, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Litzinger, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lunardi, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marchi, T.UNSPECIFIEDorcid.org/0000-0001-7339-8185UNSPECIFIED
Modamio, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Morse, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Napoli, D. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nichols, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Recchia, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stroberg, S. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wadsworth, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Weisshaar, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Whitmore, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wimmer, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-393126
DOI: 10.1103/PhysRevC.92.034306
Journal or Publication Title: Phys. Rev. C
Volume: 92
Number: 3
Date: 2015
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1089-490X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
QUANTUM PHASE-TRANSITIONS; LIFETIME MEASUREMENTS; COULOMB-EXCITATION; EXOTIC NUCLEI; ATOMIC-NUCLEI; DEFORMATION; SHAPES; REGION; TOOLMultiple languages
Physics, NuclearMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/39312

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