Beta decay rate of the transition for the study of meson-exchange effects and gp/gA

Minamisono, T.; Takeyama, K.; Ishigai, T.; Takeshima, Hirokazu; Nojiri, Y.; Asahı, K.

doi:10.1016/0370-2693(83)91050-x

Cited by 19 publications

(9 citation statements)

References 11 publications

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“…These transitions can therefore be considered an ideal case for testing our understanding of MEC's. Several measurements of A~ have been reported [7][8][9][10]. Gagliardi and Garvey [8] confirmed with much better statistics (,--5 %) the experiment of Palffy etal.…”

supporting

confidence: 71%

“…Our group had reported a value of A s [9], in agreement with those of [7] and [8] with a different setup. Since then, another value has been published [10], obtained with a method similar to ours, but differing by 35 % from the previous measurements. We report here our final measurement of the 0---+0 + decay.…”

mentioning

confidence: 85%

“…The fl-decay rate Ap of the 0-(120 keV, ta/2 = 5.25/is) level of 16N to the ground state of 160, and the inverse muon capture rate A,, have generate d considerable interest [1][2][3][4][5][6][7][8][9][10], following a suggestion [1] that the AJAp ratio was essentially nuclear structure independent. It was thought possible to extract from this ratio the induced pseudoscalar coupling constant g/gA" Later calculations [3][4][5][6] have shown that mesonic exchange currents (MEC's) account for about 75 ~ of the fl-decay rate and 35 % of the muon-capture rate.…”

Section: Pacs : 2340 Hcmentioning

confidence: 99%

“…[7] and I-8] this was accomplished by rotating targets of 15NH415NO3. We used a recirculating tSN 2 gas target (as in [10]). A pulsed 2MeV deuteron beam of 60/~A instantaneous intensity delivered by the Dynamitron of the University of Montr6al passed through a 1.3 btm nickel foil into the gas target, made out of 19 mm times 38 mm copper wave guide [1][2][3][4][5][6][7][8][9][10][11].…”

mentioning

confidence: 99%

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New measurement of the beta decay rate of the16N(0?)-16O(0+) transition

et al. 1985

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The beta decay rate of the ~6N(0-;120keV)-,~oo(0+,G.S.) transition has been remeasured. Our result (A~=0.48+0.024s-1) is in excellent agreement with a previous measurement but strongly disagrees with another experimental value. The two agreeing results provide an experimental verification of the importance of meson exchange currents in 0 + -0-weak transitions. A value of gp/ga~ll-12 can be inferred from the corresponding A, rate. PACS : 23.40. HcThe fl-decay rate Ap of the 0-(120 keV, ta/2 = 5.25/is) level of 16N to the ground state of 160, and the inverse muon capture rate A,, have generate d considerable interest [1][2][3][4][5][6][7][8][9][10], following a suggestion [1] that the AJAp ratio was essentially nuclear structure independent. It was thought possible to extract from this ratio the induced pseudoscalar coupling constant g/gA" Later calculations [3][4][5][6] have shown that mesonic exchange currents (MEC's) account for about 75 ~ of the fl-decay rate and 35 % of the muon-capture rate. These transitions can therefore be considered an ideal case for testing our understanding of MEC's. Several measurements of A~ have been reported [7][8][9][10]. Gagliardi and Garvey [8] confirmed with much better statistics (,--5 %) the experiment of Palffy etal. [7], using the same experimental technique. Our group had reported a value of A s [9], in agreement with those of [7] and [8] with a different setup. Since then, another value has been published [10], obtained with a method similar to ours, but differing by 35 % from the previous measurements. We report here our final measurement of the 0---+0 + decay. The principle of the measurement is the following:

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supporting

confidence: 71%

mentioning

confidence: 85%

Section: Pacs : 2340 Hcmentioning

confidence: 99%

mentioning

confidence: 99%

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New measurement of the beta decay rate of the16N(0?)-16O(0+) transition

et al. 1985

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“…Verify the actual shape of the 0-~0 + beta spectrum, 2. Determine the branching ratio of other transitions originating from the 0-state, 3. Ascertain the nature of backgrounds under the beta spectrum and the possibility of contamination of previous Ap measurements with such backgrounds.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the beta spectrum of the 0? (120 keV) state of16N

Champagne

Beaudoin

Hamel

et al. 1988

Z. Physik A - Atomic Nuclei

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We have measured the beta spectrum of the 0-(120 keV, t_,= 5.25 gs) state of a6N. The 2 response function of our detector has been measured, parameterlzed and then fitted to known spectral shapes taken under conditions close to those in the actual experiment. Using this response function and subtracting a 56 gs half-life background due to neutron capture in the detector, the measured 0-spectrum compares well with the allowed shape for the 0-~0 + spectrum plus a small contribution from the allowed 0--~ 1 -transition.

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Exchange Currents and Configuration Mixing Effects in the 160(0+)-16N(0-) Transitions

Nozawa¹,

Kubodera²

1986

Weak and Electromagnetic Interactions in Nuclei

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Beta decay rate of the transition for the study of meson-exchange effects and gp/gA

Cited by 19 publications

References 11 publications

New measurement of the beta decay rate of the16N(0?)-16O(0+) transition

New measurement of the beta decay rate of the16N(0?)-16O(0+) transition

Measurement of the beta spectrum of the 0? (120 keV) state of16N

Exchange Currents and Configuration Mixing Effects in the 160(0+)-16N(0-) Transitions

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