Identification of excited states in Cs-117: Systematics of the nu(h(11/12))(2) alignment

J F Smith; V Medina-Chico; C J Chiara; D B Fossan; G J Lane; J M Sears; I Thorslund; H Amro; C N Davids; R V F Janssens; D Seweryniak; I M Hibbert; R Wadsworth; I Y Lee; A O Macchiavelli

Identification of excited states in Cs-117: Systematics of the nu(h(11/12))(2) alignment

J F Smith, V Medina-Chico, C J Chiara, D B Fossan, G J Lane, J M Sears, I Thorslund, H Amro, C N Davids, R V F Janssens, D Seweryniak, I M Hibbert, R Wadsworth, I Y Lee, A O Macchiavelli

Physics

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

Abstract

Excited states have been identified in the very neutron-deficient Cs-117(55)62 nucleus. High-spin spectroscopy has been performed using the Gammasphere array, and the assignment of gamma-ray transitions to Cs-117 has been made in a separate experiment in which gamma rays were detected in coincidence with x rays and with recoiling evaporation residues. A previously observed sequence of five gamma rays has been extended by 11 transitions, to high spin, and has been identified as the yrast pi (h(11/2))[550]1/2(-) band of Cs-117. Two additional bands have been observed and are tentatively assigned to be based on protons in the [404]9/2(+) and [422]3/2(+) orbitals. Alignments of pairs of h(11/2) neutrons and protons are observed in all of the bands. The alignments are compared to cranked Woods-Saxon calculations, and are discussed with respect to the effects of a neutron-proton interaction. Of particular interest are the features of the nu (h(11/2))(2) alignment in the pi [550]1/2(-) band and of the pi (h(11/2))(2) alignment in the [422]3/2(+) band. The frequencies of these alignments can be qualitatively explained only if a neutron-proton interaction is taken into account.

Original language	English
Article number	024319
Pages (from-to)	-
Number of pages	11
Journal	Physical Review C
Volume	6302
Issue number	2
Publication status	Published - Feb 2001

Keywords

ROTATIONAL BAND STRUCTURES
COINCIDENCE DATA SETS
CROSSING FREQUENCIES
NEUTRON
SPECTROSCOPY
ISOTOPES
NUCLEI
TERMINATION
ENERGIES
I-115

Cite this

Smith, J. F., Medina-Chico, V., Chiara, C. J., Fossan, D. B., Lane, G. J., Sears, J. M., Thorslund, I., Amro, H., Davids, C. N., Janssens, R. V. F., Seweryniak, D., Hibbert, I. M., Wadsworth, R., Lee, I. Y., & Macchiavelli, A. O. (2001). Identification of excited states in Cs-117: Systematics of the nu(h(11/12))(2) alignment. Physical Review C, 6302(2), -. Article 024319.

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title = "Identification of excited states in Cs-117: Systematics of the nu(h(11/12))(2) alignment",

abstract = "Excited states have been identified in the very neutron-deficient Cs-117(55)62 nucleus. High-spin spectroscopy has been performed using the Gammasphere array, and the assignment of gamma-ray transitions to Cs-117 has been made in a separate experiment in which gamma rays were detected in coincidence with x rays and with recoiling evaporation residues. A previously observed sequence of five gamma rays has been extended by 11 transitions, to high spin, and has been identified as the yrast pi (h(11/2))[550]1/2(-) band of Cs-117. Two additional bands have been observed and are tentatively assigned to be based on protons in the [404]9/2(+) and [422]3/2(+) orbitals. Alignments of pairs of h(11/2) neutrons and protons are observed in all of the bands. The alignments are compared to cranked Woods-Saxon calculations, and are discussed with respect to the effects of a neutron-proton interaction. Of particular interest are the features of the nu (h(11/2))(2) alignment in the pi [550]1/2(-) band and of the pi (h(11/2))(2) alignment in the [422]3/2(+) band. The frequencies of these alignments can be qualitatively explained only if a neutron-proton interaction is taken into account.",

keywords = "ROTATIONAL BAND STRUCTURES, COINCIDENCE DATA SETS, CROSSING FREQUENCIES, NEUTRON, SPECTROSCOPY, ISOTOPES, NUCLEI, TERMINATION, ENERGIES, I-115",

author = "Smith, {J F} and V Medina-Chico and Chiara, {C J} and Fossan, {D B} and Lane, {G J} and Sears, {J M} and I Thorslund and H Amro and Davids, {C N} and Janssens, {R V F} and D Seweryniak and Hibbert, {I M} and R Wadsworth and Lee, {I Y} and Macchiavelli, {A O}",

year = "2001",

month = feb,

language = "English",

volume = "6302",

pages = "--",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "2",

}

TY - JOUR

T1 - Identification of excited states in Cs-117: Systematics of the nu(h(11/12))(2) alignment

AU - Smith, J F

AU - Medina-Chico, V

AU - Chiara, C J

AU - Fossan, D B

AU - Lane, G J

AU - Sears, J M

AU - Thorslund, I

AU - Amro, H

AU - Davids, C N

AU - Janssens, R V F

AU - Seweryniak, D

AU - Hibbert, I M

AU - Wadsworth, R

AU - Lee, I Y

AU - Macchiavelli, A O

PY - 2001/2

Y1 - 2001/2

N2 - Excited states have been identified in the very neutron-deficient Cs-117(55)62 nucleus. High-spin spectroscopy has been performed using the Gammasphere array, and the assignment of gamma-ray transitions to Cs-117 has been made in a separate experiment in which gamma rays were detected in coincidence with x rays and with recoiling evaporation residues. A previously observed sequence of five gamma rays has been extended by 11 transitions, to high spin, and has been identified as the yrast pi (h(11/2))[550]1/2(-) band of Cs-117. Two additional bands have been observed and are tentatively assigned to be based on protons in the [404]9/2(+) and [422]3/2(+) orbitals. Alignments of pairs of h(11/2) neutrons and protons are observed in all of the bands. The alignments are compared to cranked Woods-Saxon calculations, and are discussed with respect to the effects of a neutron-proton interaction. Of particular interest are the features of the nu (h(11/2))(2) alignment in the pi [550]1/2(-) band and of the pi (h(11/2))(2) alignment in the [422]3/2(+) band. The frequencies of these alignments can be qualitatively explained only if a neutron-proton interaction is taken into account.

AB - Excited states have been identified in the very neutron-deficient Cs-117(55)62 nucleus. High-spin spectroscopy has been performed using the Gammasphere array, and the assignment of gamma-ray transitions to Cs-117 has been made in a separate experiment in which gamma rays were detected in coincidence with x rays and with recoiling evaporation residues. A previously observed sequence of five gamma rays has been extended by 11 transitions, to high spin, and has been identified as the yrast pi (h(11/2))[550]1/2(-) band of Cs-117. Two additional bands have been observed and are tentatively assigned to be based on protons in the [404]9/2(+) and [422]3/2(+) orbitals. Alignments of pairs of h(11/2) neutrons and protons are observed in all of the bands. The alignments are compared to cranked Woods-Saxon calculations, and are discussed with respect to the effects of a neutron-proton interaction. Of particular interest are the features of the nu (h(11/2))(2) alignment in the pi [550]1/2(-) band and of the pi (h(11/2))(2) alignment in the [422]3/2(+) band. The frequencies of these alignments can be qualitatively explained only if a neutron-proton interaction is taken into account.

KW - ROTATIONAL BAND STRUCTURES

KW - COINCIDENCE DATA SETS

KW - CROSSING FREQUENCIES

KW - NEUTRON

KW - SPECTROSCOPY

KW - ISOTOPES

KW - NUCLEI

KW - TERMINATION

KW - ENERGIES

KW - I-115

M3 - Article

SN - 2469-9985

VL - 6302

SP - -

JO - Physical Review C

JF - Physical Review C

IS - 2

M1 - 024319

ER -