Evidence for isovector neutron-proton pairing from high-spin states in N=Z Rb-74

CD O'Leary; CE Svensson; SG Frauendorf; AV Afanasjev; DE Appelbe; RAE Austin; GC Ball; JA Cameron; RM Clark; M Cromaz; P Fallon; DF Hodgson; NS Kelsall; AO Macchiavelli; I Ragnarsson; D Sarantites; JC Waddington; R Wadsworth

doi:10.1103/PhysRevC.67.021301

Evidence for isovector neutron-proton pairing from high-spin states in N=Z Rb-74

CD O'Leary^*
, CE Svensson
, SG Frauendorf
, AV Afanasjev
, DE Appelbe
, RAE Austin
, GC Ball
, JA Cameron
, RM Clark
, M Cromaz
, P Fallon
, DF Hodgson
, NS Kelsall
, AO Macchiavelli
, I Ragnarsson
, D Sarantites
, JC Waddington
, R Wadsworth

^*Corresponding author for this work

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

Abstract

High-spin states in the odd-odd N=Z nucleus Rb-74(37)37 were studied using the Ca-40(Ca-40,alphanp) reaction. A previously observed odd-spin T=0 band has been extended to I-pi=(31(+)) and an even-spin T=0 band has been observed for the first time to I-pi=(22(+)); both have a pi(g(9/2))circle timesnu(g(9/2)) structure. A strongly coupled low-spin T=0,K=3 band has been interpreted as being based upon a pi[312]3/2 circle timesnu[312]3/2 configuration. Cranked relativistic Hartree-Bogoliubov calculations, which are corrected for the t=1 np-pair field by restoring isospin symmetry, reproduce the observed spectrum. These new results provide evidence for the existence of an isovector pair field that contains a neutron-proton component with the proper strength for ensuring isospin conservation.

Original language	English
Article number	021301
Number of pages	5
Journal	Physical Review C - Nuclear Physics
Volume	67
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.67.021301
Publication status	Published - 28 Feb 2003

Keywords

SYMMETRY
= Z NUCLEI
HARTREE-BOGOLIUBOV THEORY
ENERGY
A-SIMILAR-TO-190 REGION
IDENTIFICATION
CRANKED SHELL-MODEL
T=0
SUPERDEFORMED BANDS
ROTATIONAL BANDS

Access to Document

10.1103/PhysRevC.67.021301

http://prc.aps.org/abstract/PRC/v67/i2/e021301

Cite this

O'Leary, CD., Svensson, CE., Frauendorf, SG., Afanasjev , AV., Appelbe, DE., Austin, RAE., Ball, GC., Cameron, JA., Clark, RM., Cromaz, M., Fallon, P., Hodgson, DF., Kelsall, NS., Macchiavelli, AO., Ragnarsson, I., Sarantites, D., Waddington, JC., & Wadsworth, R. (2003). Evidence for isovector neutron-proton pairing from high-spin states in N=Z Rb-74. Physical Review C - Nuclear Physics, 67(2), Article 021301. https://doi.org/10.1103/PhysRevC.67.021301

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title = "Evidence for isovector neutron-proton pairing from high-spin states in N=Z Rb-74",

abstract = "High-spin states in the odd-odd N=Z nucleus Rb-74(37)37 were studied using the Ca-40(Ca-40,alphanp) reaction. A previously observed odd-spin T=0 band has been extended to I-pi=(31(+)) and an even-spin T=0 band has been observed for the first time to I-pi=(22(+)); both have a pi(g(9/2))circle timesnu(g(9/2)) structure. A strongly coupled low-spin T=0,K=3 band has been interpreted as being based upon a pi[312]3/2 circle timesnu[312]3/2 configuration. Cranked relativistic Hartree-Bogoliubov calculations, which are corrected for the t=1 np-pair field by restoring isospin symmetry, reproduce the observed spectrum. These new results provide evidence for the existence of an isovector pair field that contains a neutron-proton component with the proper strength for ensuring isospin conservation.",

keywords = "SYMMETRY, = Z NUCLEI, HARTREE-BOGOLIUBOV THEORY, ENERGY, A-SIMILAR-TO-190 REGION, IDENTIFICATION, CRANKED SHELL-MODEL, T=0, SUPERDEFORMED BANDS, ROTATIONAL BANDS",

author = "CD O'Leary and CE Svensson and SG Frauendorf and AV Afanasjev and DE Appelbe and RAE Austin and GC Ball and JA Cameron and RM Clark and M Cromaz and P Fallon and DF Hodgson and NS Kelsall and AO Macchiavelli and I Ragnarsson and D Sarantites and JC Waddington and R Wadsworth",

year = "2003",

month = feb,

day = "28",

doi = "10.1103/PhysRevC.67.021301",

language = "English",

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journal = "Physical Review C - Nuclear Physics",

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O'Leary, CD, Svensson, CE, Frauendorf, SG, Afanasjev , AV, Appelbe, DE, Austin, RAE, Ball, GC, Cameron, JA, Clark, RM, Cromaz, M, Fallon, P, Hodgson, DF, Kelsall, NS, Macchiavelli, AO, Ragnarsson, I, Sarantites, D, Waddington, JC & Wadsworth, R 2003, 'Evidence for isovector neutron-proton pairing from high-spin states in N=Z Rb-74', Physical Review C - Nuclear Physics, vol. 67, no. 2, 021301. https://doi.org/10.1103/PhysRevC.67.021301

TY - JOUR

T1 - Evidence for isovector neutron-proton pairing from high-spin states in N=Z Rb-74

AU - O'Leary, CD

AU - Svensson, CE

AU - Frauendorf, SG

AU - Afanasjev , AV

AU - Appelbe, DE

AU - Austin, RAE

AU - Ball, GC

AU - Cameron, JA

AU - Clark, RM

AU - Cromaz, M

AU - Fallon, P

AU - Hodgson, DF

AU - Kelsall, NS

AU - Macchiavelli, AO

AU - Ragnarsson, I

AU - Sarantites, D

AU - Waddington, JC

AU - Wadsworth, R

PY - 2003/2/28

Y1 - 2003/2/28

N2 - High-spin states in the odd-odd N=Z nucleus Rb-74(37)37 were studied using the Ca-40(Ca-40,alphanp) reaction. A previously observed odd-spin T=0 band has been extended to I-pi=(31(+)) and an even-spin T=0 band has been observed for the first time to I-pi=(22(+)); both have a pi(g(9/2))circle timesnu(g(9/2)) structure. A strongly coupled low-spin T=0,K=3 band has been interpreted as being based upon a pi[312]3/2 circle timesnu[312]3/2 configuration. Cranked relativistic Hartree-Bogoliubov calculations, which are corrected for the t=1 np-pair field by restoring isospin symmetry, reproduce the observed spectrum. These new results provide evidence for the existence of an isovector pair field that contains a neutron-proton component with the proper strength for ensuring isospin conservation.

AB - High-spin states in the odd-odd N=Z nucleus Rb-74(37)37 were studied using the Ca-40(Ca-40,alphanp) reaction. A previously observed odd-spin T=0 band has been extended to I-pi=(31(+)) and an even-spin T=0 band has been observed for the first time to I-pi=(22(+)); both have a pi(g(9/2))circle timesnu(g(9/2)) structure. A strongly coupled low-spin T=0,K=3 band has been interpreted as being based upon a pi[312]3/2 circle timesnu[312]3/2 configuration. Cranked relativistic Hartree-Bogoliubov calculations, which are corrected for the t=1 np-pair field by restoring isospin symmetry, reproduce the observed spectrum. These new results provide evidence for the existence of an isovector pair field that contains a neutron-proton component with the proper strength for ensuring isospin conservation.

KW - SYMMETRY

KW - = Z NUCLEI

KW - HARTREE-BOGOLIUBOV THEORY

KW - ENERGY

KW - A-SIMILAR-TO-190 REGION

KW - IDENTIFICATION

KW - CRANKED SHELL-MODEL

KW - T=0

KW - SUPERDEFORMED BANDS

KW - ROTATIONAL BANDS

U2 - 10.1103/PhysRevC.67.021301

DO - 10.1103/PhysRevC.67.021301

M3 - Article

SN - 0556-2813

VL - 67

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 2

M1 - 021301

ER -