You need JavaScript to view this

Structure of high-spin states in A {approx} 60 region

Abstract

High-spin states in the proton-rich Cu-Zn nuclei are investigated by the experiments at JAERI. New levels and {gamma}-rays are identified by the particle-{gamma}-{gamma} coincidence, and J{sup P} assignments are made via the DCO ratio analysis. Yrast sequences are observed up to J {approx} 18 for {sup 62}Zn, and {sup 64}Zn, J {approx} 27/2 for {sup 61}Cu and J {approx} 23/2 for {sup 63}Cu. Though we cannot settle new J{sup P} values for {sup 61,63}Zn, their yrast sequence is also extended. In {sup 64}Zn, a doublet of {gamma}-rays is discovered at 1315 keV, clarifying the similarity in the level scheme between {sup 62}Zn and {sup 64}Zn. We reproduce the yrast levels by a shell-model calculation, by which structure of the high-spin states is further studied. A parity change in the yrast sequence is established, in which the unique-parity orbit 0g{sub 9/2} plays an essential role; one nucleon excitation to g{sub 9/2} gains high angular momentum with low seniority, at the cost of the single-parity energy. Second parity-change is also suggested by the calculation. Such parity change seems characteristic to spherical or nearly spherical nuclei. In {sup 61}Cu, concentration of the {gamma}-ray intensity is observed. This happens because a stretched 3-quasiparticle configuration  More>>
Authors:
Nakada, Hitoshi; [1]  Furutaka, K; Hatsukawa, Y [2] 
  1. Chiba Univ. (Japan)
  2. and others
Publication Date:
Mar 01, 1998
Product Type:
Conference
Report Number:
JAERI-Conf-98-008; CONF-9707156-
Reference Number:
SCA: 663120; 663550; PA: JPN-98:006147; EDB-98:080760; SN: 98001981427
Resource Relation:
Conference: Workshop on gamma-ray spectroscopy utilizing heavy-ion, photon and RI beams, Tokai (Japan), 15-16 Jul 1997; Other Information: PBD: Mar 1998; Related Information: Is Part Of Proceeding of the workshop on gamma-ray spectroscopy utilizing heavy-ion, photon and RI beams; Oshima, Masumi; Sugita, Michiaki; Hayakawa, Takehito [eds.]; PB: 117 p.
Subject:
66 PHYSICS; CALCIUM 40 TARGET; SILICON 28 REACTIONS; GAMMA SPECTROSCOPY; COINCIDENCE METHODS; COPPER 61; ZINC 62; ZINC 64; HIGH SPIN STATES; SHELL MODELS
OSTI ID:
630019
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE98755723; TRN: JP9806147
Availability:
OSTI as DE98755723
Submitting Site:
JPN
Size:
pp. 97-101
Announcement Date:

Citation Formats

Nakada, Hitoshi, Furutaka, K, and Hatsukawa, Y. Structure of high-spin states in A {approx} 60 region. Japan: N. p., 1998. Web.
Nakada, Hitoshi, Furutaka, K, & Hatsukawa, Y. Structure of high-spin states in A {approx} 60 region. Japan.
Nakada, Hitoshi, Furutaka, K, and Hatsukawa, Y. 1998. "Structure of high-spin states in A {approx} 60 region." Japan.
@misc{etde_630019,
title = {Structure of high-spin states in A {approx} 60 region}
author = {Nakada, Hitoshi, Furutaka, K, and Hatsukawa, Y}
abstractNote = {High-spin states in the proton-rich Cu-Zn nuclei are investigated by the experiments at JAERI. New levels and {gamma}-rays are identified by the particle-{gamma}-{gamma} coincidence, and J{sup P} assignments are made via the DCO ratio analysis. Yrast sequences are observed up to J {approx} 18 for {sup 62}Zn, and {sup 64}Zn, J {approx} 27/2 for {sup 61}Cu and J {approx} 23/2 for {sup 63}Cu. Though we cannot settle new J{sup P} values for {sup 61,63}Zn, their yrast sequence is also extended. In {sup 64}Zn, a doublet of {gamma}-rays is discovered at 1315 keV, clarifying the similarity in the level scheme between {sup 62}Zn and {sup 64}Zn. We reproduce the yrast levels by a shell-model calculation, by which structure of the high-spin states is further studied. A parity change in the yrast sequence is established, in which the unique-parity orbit 0g{sub 9/2} plays an essential role; one nucleon excitation to g{sub 9/2} gains high angular momentum with low seniority, at the cost of the single-parity energy. Second parity-change is also suggested by the calculation. Such parity change seems characteristic to spherical or nearly spherical nuclei. In {sup 61}Cu, concentration of the {gamma}-ray intensity is observed. This happens because a stretched 3-quasiparticle configuration including 0g{sub 9/2} is relatively stable, similarly to some isomers. Thus, by studying the structure of the high-spin states of the A {approx} 60 nuclei, we have clarified the role of unique-parity orbit in high-spin states, which may be generic to spherical and nearly spherical nuclei. (J.P.N.)}
place = {Japan}
year = {1998}
month = {Mar}
}