Dilepton and photon decay of giant resonances built on excited states of Ni-56

A.J. Buda; J.C.S Bacelar; S. Barmejee; H. Ching; D. Hofman; P. Paul; S. Schadmand; A. van der Woude

doi:10.1103/PhysRevC.55.504

Dilepton and photon decay of giant resonances built on excited states of Ni-56

A.J. Buda, J.C.S Bacelar, S. Barmejee, H. Ching, D. Hofman, P. Paul, S. Schadmand, A. van der Woude

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Abstract

Nuclear states in Ni-56, at an initial excitation energy E*=70 MeV, were populated via the isospin T=0 reaction O-16+Ca-40. The dilepton- (e(+)e(-)) pairs and photon-decay yields were measured simultaneously. Statistical decay calculations describe well both measurements on an absolute scale. The isospin mixing parameter extracted from these measurements (alpha(2)=0.065) is consistent with other studies of the isospin symmetry in highly excited compound nuclei. The 1 sigma upper limit for the observed monopole strength is 4.3 nb, which is 3 times higher than the one sum rule value calculated with the statistical model for the decay of the compound nucleus.

Original language	English
Pages (from-to)	504-507
Number of pages	4
Journal	Physical Review C
Volume	55
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.55.504
Publication status	Published - Jan-1997

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title = "Dilepton and photon decay of giant resonances built on excited states of Ni-56",

abstract = "Nuclear states in Ni-56, at an initial excitation energy E*=70 MeV, were populated via the isospin T=0 reaction O-16+Ca-40. The dilepton- (e(+)e(-)) pairs and photon-decay yields were measured simultaneously. Statistical decay calculations describe well both measurements on an absolute scale. The isospin mixing parameter extracted from these measurements (alpha(2)=0.065) is consistent with other studies of the isospin symmetry in highly excited compound nuclei. The 1 sigma upper limit for the observed monopole strength is 4.3 nb, which is 3 times higher than the one sum rule value calculated with the statistical model for the decay of the compound nucleus.",

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year = "1997",

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T1 - Dilepton and photon decay of giant resonances built on excited states of Ni-56

AU - Buda, A.J.

AU - Bacelar, J.C.S

AU - Barmejee, S.

AU - Ching, H.

AU - Hofman, D.

AU - Paul, P.

AU - Schadmand, S.

AU - van der Woude, A.

PY - 1997/1

Y1 - 1997/1

N2 - Nuclear states in Ni-56, at an initial excitation energy E*=70 MeV, were populated via the isospin T=0 reaction O-16+Ca-40. The dilepton- (e(+)e(-)) pairs and photon-decay yields were measured simultaneously. Statistical decay calculations describe well both measurements on an absolute scale. The isospin mixing parameter extracted from these measurements (alpha(2)=0.065) is consistent with other studies of the isospin symmetry in highly excited compound nuclei. The 1 sigma upper limit for the observed monopole strength is 4.3 nb, which is 3 times higher than the one sum rule value calculated with the statistical model for the decay of the compound nucleus.

AB - Nuclear states in Ni-56, at an initial excitation energy E*=70 MeV, were populated via the isospin T=0 reaction O-16+Ca-40. The dilepton- (e(+)e(-)) pairs and photon-decay yields were measured simultaneously. Statistical decay calculations describe well both measurements on an absolute scale. The isospin mixing parameter extracted from these measurements (alpha(2)=0.065) is consistent with other studies of the isospin symmetry in highly excited compound nuclei. The 1 sigma upper limit for the observed monopole strength is 4.3 nb, which is 3 times higher than the one sum rule value calculated with the statistical model for the decay of the compound nucleus.

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DO - 10.1103/PhysRevC.55.504

M3 - Article

VL - 55

SP - 504

EP - 507

JO - Physical Review C

JF - Physical Review C

IS - 1

ER -

Dilepton and photon decay of giant resonances built on excited states of Ni-56

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