NON-SPIN-FLIP (HE-3, T) CHARGE-EXCHANGE AND ISOBARIC ANALOG STATES OF ACTINIDE NUCLEI STUDIED AT THETA=0-DEGREES, E(HE-3)=76 MEV AND 200 MEV

Autor: Janecke, J., FD BECCHETTI, Den Berg, Adriaan M., GPA BERG, MB GREENFIELD, Muhsin N. Harakeh, MA HOFSTEE, Nadasen, A., DA ROBERTS, Sawafta, R., Schippers, Jacobus M., EJ STEPHENSON, DP STEWART, SY VANDERWERF
Přispěvatelé: KVI - Center for Advanced Radiation Technology, Research unit Astroparticle Physics
Předmět:
SN-120
TA
W
AU-197
PB-208
TH-230
TH-232
U-234
U-238
PU-244
MONOPOLE RESONANCE
Nuclear Theory
MEASURED PROTON DECAY FROM IAS
THETA(ET
EP
THETA-T
MEASURED SIGMA(THETA-T) FOR ISOBARIC ANALOG STATE (IAS)
OF IAS
PB-208
PA-230
PA-232
NP-234
NP-236
NP-238
AM-244
MEASURED SIGMA (ET) THETA=0-DEGREES
TH-230
TH-232
U-234
U-236
U-238 (HE-3
TP)
E=76.5 MEV
ENRICHED AND LONG-LIVED RADIOACTIVE TARGETS
DEPENDENCE
SN-120 (HE-3
T)
E=200 MEV
ISOVECTOR GIANT-RESONANCES
EFFECTIVE INTERACTION V-TAU FOR NON-SPIN-FLIP CHARGE EXCHANGE
THETA-P) FOR THETA-T=0-DEGREES
THETA-P=+120-DEGREES
+150
Nuclear Experiment
THETA-T=0-DEGREES TO 16-DEGREES
= 0-DEGREES
DEDUCED Q-VALUES FOR TRANSITIONS TO IAS
NB-90
SB-117
SN-120
(HE-3
T)
E=200 MEV
C-12
O-16
AL-27
SI-28
TA
TH-230
TH-232
U-234
U-236
U-238
TRANSITIONS TO IAS
P-30
NB-90
SN-120
PB-208
GAMMA
ESCAPE WIDTHS GAMMA-UP
SPREADING WIDTHS GAMMA-DOWN
MODEL
PROBABILITY
LIGHT
(HE-3
T)
E=76.5 MEV C-12
C-13
O-16
F-19
SI-28
ZR-90
SN-117
COULOMB DISPLACEMENT ENERGIES
W-181
RE-184
HG-197
PB-208
PA-230
PA-232
NP-234
NP-236
MAGNETIC SPECTROMETERS
DEGREES
-150-DEGREES
NP-238
AM-244
COULOMB DISPLACEMENT ENERGIES
TOTAL WIDTHS
INTERMEDIATE ENERGIES
DECAY
Zdroj: University of Groningen
Nuclear Physics A, 526(1), 1-35. ELSEVIER SCIENCE BV
ISSN: 0375-9474
Popis: The (He-3, t) charge-exchange reaction has been studied at theta = 0-degree-C and bombarding energies of E(He-3) = 76.5 MeV and 200 MeV. Spectra were measured using magnetic analysis for target nuclei of C-12, C-13, O-16, F-19, Si-28, Si-29, Si-30, Zr-90, Sn-117, Sn-120, (nat)Ta, (nat)W, Au-197, Pb-208, Th-230, Th-232, U-234, U-236, U-238 and Pu-244. The measurements at 76.5 MeV concentrated on the isobaric analog states of several actinide nuclei, particularly on their widths and the branching ratios for proton decay. Cross sections, Q-values and total widths were determined for the transitions to the isobaric analog states. Coulomb displacement energies derived from the measured Q-values display the influence of deformed nuclear shapes. Escape widths GAMMA-up and spreding widths GAMMA-down of the isobaric analog states in five actinide nuclei were deduced from the measured proton-decay branching ratios. They were found to be in agreement with predictions which postulate isospin mixing via the Coulomb force with the (T0-1)-component of the isovector giant monopole resonance. The measurements at 200 MeV were concerned with transitions to isobaric analog states in both light and heavy nuclei, including several actinide nuclei, but Gamow-Teller resonances and transitions to numerous other states were also observed. The measured cross sections for several transitions to isobaric analog states from Si-30 to Pb-208 were used to extract the effective interaction V(tau) for non-spin-flip (He-3, t) charge exchange at E(He-3) almost-equal-to 200 MeV. The interaction strength V(tau) decreases by a factor 0.6 when compared to previously measured values for the energy range E(He-3) = 65 to 90 MeV. An angular distribution from theta(t) = 0-degree to 16-degrees for the transition to the isobaric analog state in Sb-120 measured at E(He-3) = 200 MeV was found to be in very good agreement with microscopic calculations.
Databáze: OpenAIRE
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