Observation of mutually enhanced collectivity in self-conjugate 76Sr

A. Lemasson; H. Iwasaki; C. Morse; D. Bazin; T. Baugher; J. S. Berryman; A. Dewald; C. Fransen; A. Gade; S. McDaniel; A. Nichols; A. Ratkiewicz; S. Stroberg; P. Voss; R. Wadsworth; D. Weisshaar; K. Wimmer; R. Winkler

doi:10.1103/PhysRevC.85.041303

Observation of mutually enhanced collectivity in self-conjugate ⁷⁶Sr

A. Lemasson^*, H. Iwasaki, C. Morse, D. Bazin, T. Baugher, J. S. Berryman, A. Dewald, C. Fransen, A. Gade, S. McDaniel, A. Nichols, A. Ratkiewicz, S. Stroberg, P. Voss, R. Wadsworth, D. Weisshaar, K. Wimmer, R. Winkler

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The lifetimes of the first 2(+) states in the neutron-deficient Sr-76,Sr-78 isotopes were measured using a unique combination of the gamma-ray line-shape method and two-step nucleon exchange reactions at intermediate energies. The transition rates for the 2(+) states were determined to be B(E2;2(+) -> 0(+)) = 2220(270) e(2)fm(4) for Sr-76 and 1800(250) e(2)fm(4) for Sr-78, corresponding to large deformation of beta(2) = 0.45(3) for Sr-76 and 0.40(3) for Sr-78. The present data provide experimental evidence for mutually enhanced collectivity that occurs at N = Z = 38. The systematic behavior of the excitation energies and B(E2) values indicates a signature of shape coexistence in Sr-76, characterizing Sr-76 as one of most deformed nuclei with an unusually reduced E(4(+))/E(2(+)) ratio.

Original language	English
Article number	ARTN 041303
Number of pages	4
Journal	Physical Review C
Volume	85
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.85.041303
Publication status	Published - 19 Apr 2012

Keywords

ISOTOPES
KR-74
KR
DEFORMATIONS
TRANSITION
SHAPE COEXISTENCE
GERMANIUM
EXOTIC NUCLEI
REGION
A=80

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10.1103/PhysRevC.85.041303

Cite this

Lemasson, A., Iwasaki, H., Morse, C., Bazin, D., Baugher, T., Berryman, J. S., Dewald, A., Fransen, C., Gade, A., McDaniel, S., Nichols, A., Ratkiewicz, A., Stroberg, S., Voss, P., Wadsworth, R., Weisshaar, D., Wimmer, K., & Winkler, R. (2012). Observation of mutually enhanced collectivity in self-conjugate ⁷⁶Sr. Physical Review C, 85(4), Article ARTN 041303. https://doi.org/10.1103/PhysRevC.85.041303

@article{01ec869e25e14129ad08da59cc8fe18e,

title = "Observation of mutually enhanced collectivity in self-conjugate 76Sr",

abstract = "The lifetimes of the first 2(+) states in the neutron-deficient Sr-76,Sr-78 isotopes were measured using a unique combination of the gamma-ray line-shape method and two-step nucleon exchange reactions at intermediate energies. The transition rates for the 2(+) states were determined to be B(E2;2(+) -> 0(+)) = 2220(270) e(2)fm(4) for Sr-76 and 1800(250) e(2)fm(4) for Sr-78, corresponding to large deformation of beta(2) = 0.45(3) for Sr-76 and 0.40(3) for Sr-78. The present data provide experimental evidence for mutually enhanced collectivity that occurs at N = Z = 38. The systematic behavior of the excitation energies and B(E2) values indicates a signature of shape coexistence in Sr-76, characterizing Sr-76 as one of most deformed nuclei with an unusually reduced E(4(+))/E(2(+)) ratio.",

keywords = "ISOTOPES, KR-74, KR, DEFORMATIONS, TRANSITION, SHAPE COEXISTENCE, GERMANIUM, EXOTIC NUCLEI, REGION, A=80",

author = "A. Lemasson and H. Iwasaki and C. Morse and D. Bazin and T. Baugher and Berryman, {J. S.} and A. Dewald and C. Fransen and A. Gade and S. McDaniel and A. Nichols and A. Ratkiewicz and S. Stroberg and P. Voss and R. Wadsworth and D. Weisshaar and K. Wimmer and R. Winkler",

year = "2012",

month = apr,

day = "19",

doi = "10.1103/PhysRevC.85.041303",

language = "English",

volume = "85",

journal = "Physical Review C",

issn = "2469-9985",

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Lemasson, A, Iwasaki, H, Morse, C, Bazin, D, Baugher, T, Berryman, JS, Dewald, A, Fransen, C, Gade, A, McDaniel, S, Nichols, A, Ratkiewicz, A, Stroberg, S, Voss, P, Wadsworth, R, Weisshaar, D, Wimmer, K & Winkler, R 2012, 'Observation of mutually enhanced collectivity in self-conjugate ⁷⁶Sr', Physical Review C, vol. 85, no. 4, ARTN 041303. https://doi.org/10.1103/PhysRevC.85.041303

TY - JOUR

T1 - Observation of mutually enhanced collectivity in self-conjugate 76Sr

AU - Lemasson, A.

AU - Iwasaki, H.

AU - Morse, C.

AU - Bazin, D.

AU - Baugher, T.

AU - Berryman, J. S.

AU - Dewald, A.

AU - Fransen, C.

AU - Gade, A.

AU - McDaniel, S.

AU - Nichols, A.

AU - Ratkiewicz, A.

AU - Stroberg, S.

AU - Voss, P.

AU - Wadsworth, R.

AU - Weisshaar, D.

AU - Wimmer, K.

AU - Winkler, R.

PY - 2012/4/19

Y1 - 2012/4/19

N2 - The lifetimes of the first 2(+) states in the neutron-deficient Sr-76,Sr-78 isotopes were measured using a unique combination of the gamma-ray line-shape method and two-step nucleon exchange reactions at intermediate energies. The transition rates for the 2(+) states were determined to be B(E2;2(+) -> 0(+)) = 2220(270) e(2)fm(4) for Sr-76 and 1800(250) e(2)fm(4) for Sr-78, corresponding to large deformation of beta(2) = 0.45(3) for Sr-76 and 0.40(3) for Sr-78. The present data provide experimental evidence for mutually enhanced collectivity that occurs at N = Z = 38. The systematic behavior of the excitation energies and B(E2) values indicates a signature of shape coexistence in Sr-76, characterizing Sr-76 as one of most deformed nuclei with an unusually reduced E(4(+))/E(2(+)) ratio.

AB - The lifetimes of the first 2(+) states in the neutron-deficient Sr-76,Sr-78 isotopes were measured using a unique combination of the gamma-ray line-shape method and two-step nucleon exchange reactions at intermediate energies. The transition rates for the 2(+) states were determined to be B(E2;2(+) -> 0(+)) = 2220(270) e(2)fm(4) for Sr-76 and 1800(250) e(2)fm(4) for Sr-78, corresponding to large deformation of beta(2) = 0.45(3) for Sr-76 and 0.40(3) for Sr-78. The present data provide experimental evidence for mutually enhanced collectivity that occurs at N = Z = 38. The systematic behavior of the excitation energies and B(E2) values indicates a signature of shape coexistence in Sr-76, characterizing Sr-76 as one of most deformed nuclei with an unusually reduced E(4(+))/E(2(+)) ratio.

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KW - KR

KW - DEFORMATIONS

KW - TRANSITION

KW - SHAPE COEXISTENCE

KW - GERMANIUM

KW - EXOTIC NUCLEI

KW - REGION

KW - A=80

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U2 - 10.1103/PhysRevC.85.041303

DO - 10.1103/PhysRevC.85.041303

M3 - Article

SN - 2469-9985

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JO - Physical Review C

JF - Physical Review C

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M1 - ARTN 041303