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Title: Low-lying structures in the Gamow-Teller strength functions for the double-beta-decaying nuclei sup 76 Ge, sup 82 Se, sup 128 Te, and sup 130 Te

Abstract

Excitation-energy distributions of transition strength to 1{sup +} states excited via the ({ital p},{ital n}) reaction at 134.4 MeV on targets of {sup 76}Ge, {sup 82}Se, {sup 128}Te, and {sup 130}Te were measured for excitation energies up to 25 MeV. Structures observed in the neutron spectra with forward-peaked ({Delta}{ital L}=0) angular distributions were identified as 1{sup +} states, except for the isobaric analog transitions. The total 1{sup +} strength in these reactions was extracted by normalizing the intensity in the 1{sup +} peaks to the Fermi transition strength observed in the isobaric analog state. The Gamow-Teller strength observed in 1{sup +} peaks above a fitted polynomial background is typically 55% of the sum rule obtained by assuming that the strength of {beta}{sup +} transitions is negligible. The portion of this strength found at excitation energies less than that of the Gamow-Teller giant resonance varied from 15% for {sup 128}Te to 38% for {sup 76}Ge. Experimental results are compared with predictions of a shell model that includes a pairing force and a long-range Gamow-Teller force in both parent and daughter nuclei. A comparison of the strength functions of the tellurium isotopes is made; this comparison is relevant in determining whether double-betamore » decay without neutrino emission (0{nu} decay) is observed in these isotopes.« less

Authors:
; ; ; ;  [1];  [2];  [3];  [3];  [4]
  1. Department of Physics, Kent State University, Kent, Ohio 44242 (US)
  2. Department of Physics and Astronomy and Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
  3. Indiana University Cyclotron Facility, Bloomington, Indiana 47405
  4. Max-Planck-Institut fur Kernphysik, Heidelberg, Federal Republic of Germany
Publication Date:
OSTI Identifier:
5539668
Resource Type:
Journal Article
Journal Name:
Physical Review (Section) C: Nuclear Physics; (USA)
Additional Journal Information:
Journal Volume: 40:2; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; GERMANIUM 76 TARGET; PROTON REACTIONS; CHARGE-EXCHANGE REACTIONS; SELENIUM 82 TARGET; TELLURIUM 128 TARGET; TELLURIUM 130 TARGET; ARSENIC 76; BETA DECAY; BROMINE 82; DIFFERENTIAL CROSS SECTIONS; ENERGY LEVELS; GAMOW-TELLER RULES; IODINE 128; IODINE 130; ISOBARIC ANALOGS; IU CYCLOTRON; MEV RANGE 100-1000; NEUTRON SPECTRA; SHELL MODELS; STRENGTH FUNCTIONS; ACCELERATORS; ARSENIC ISOTOPES; BARYON REACTIONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BROMINE ISOTOPES; CHARGED-PARTICLE REACTIONS; CROSS SECTIONS; CYCLIC ACCELERATORS; CYCLOTRONS; DAYS LIVING RADIOISOTOPES; DECAY; ELECTRON CAPTURE RADIOISOTOPES; ENERGY RANGE; FUNCTIONS; HADRON REACTIONS; HOURS LIVING RADIOISOTOPES; INTERMEDIATE MASS NUCLEI; IODINE ISOTOPES; ISOCHRONOUS CYCLOTRONS; ISOTOPES; MATHEMATICAL MODELS; MEV RANGE; MINUTES LIVING RADIOISOTOPES; NUCLEAR DECAY; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; ODD-ODD NUCLEI; RADIOISOTOPES; SPECTRA; TARGETS; 651620* - Nuclear Properties & Reactions, A=59-89, Experimental; 651720 - Nuclear Properties & Reactions, A=90-149, Experimental

Citation Formats

Madey, R, Flanders, B S, Anderson, B D, Baldwin, A R, Watson, J W, Austin, S M, Foster, C C, Klapdor, H V, and Grotz, K. Low-lying structures in the Gamow-Teller strength functions for the double-beta-decaying nuclei sup 76 Ge, sup 82 Se, sup 128 Te, and sup 130 Te. United States: N. p., 1989. Web. doi:10.1103/PhysRevC.40.540.
Madey, R, Flanders, B S, Anderson, B D, Baldwin, A R, Watson, J W, Austin, S M, Foster, C C, Klapdor, H V, & Grotz, K. Low-lying structures in the Gamow-Teller strength functions for the double-beta-decaying nuclei sup 76 Ge, sup 82 Se, sup 128 Te, and sup 130 Te. United States. doi:10.1103/PhysRevC.40.540.
Madey, R, Flanders, B S, Anderson, B D, Baldwin, A R, Watson, J W, Austin, S M, Foster, C C, Klapdor, H V, and Grotz, K. Tue . "Low-lying structures in the Gamow-Teller strength functions for the double-beta-decaying nuclei sup 76 Ge, sup 82 Se, sup 128 Te, and sup 130 Te". United States. doi:10.1103/PhysRevC.40.540.
@article{osti_5539668,
title = {Low-lying structures in the Gamow-Teller strength functions for the double-beta-decaying nuclei sup 76 Ge, sup 82 Se, sup 128 Te, and sup 130 Te},
author = {Madey, R and Flanders, B S and Anderson, B D and Baldwin, A R and Watson, J W and Austin, S M and Foster, C C and Klapdor, H V and Grotz, K},
abstractNote = {Excitation-energy distributions of transition strength to 1{sup +} states excited via the ({ital p},{ital n}) reaction at 134.4 MeV on targets of {sup 76}Ge, {sup 82}Se, {sup 128}Te, and {sup 130}Te were measured for excitation energies up to 25 MeV. Structures observed in the neutron spectra with forward-peaked ({Delta}{ital L}=0) angular distributions were identified as 1{sup +} states, except for the isobaric analog transitions. The total 1{sup +} strength in these reactions was extracted by normalizing the intensity in the 1{sup +} peaks to the Fermi transition strength observed in the isobaric analog state. The Gamow-Teller strength observed in 1{sup +} peaks above a fitted polynomial background is typically 55% of the sum rule obtained by assuming that the strength of {beta}{sup +} transitions is negligible. The portion of this strength found at excitation energies less than that of the Gamow-Teller giant resonance varied from 15% for {sup 128}Te to 38% for {sup 76}Ge. Experimental results are compared with predictions of a shell model that includes a pairing force and a long-range Gamow-Teller force in both parent and daughter nuclei. A comparison of the strength functions of the tellurium isotopes is made; this comparison is relevant in determining whether double-beta decay without neutrino emission (0{nu} decay) is observed in these isotopes.},
doi = {10.1103/PhysRevC.40.540},
journal = {Physical Review (Section) C: Nuclear Physics; (USA)},
issn = {0556-2813},
number = ,
volume = 40:2,
place = {United States},
year = {1989},
month = {8}
}