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Pion absorption in3He at 100, 120, and 145 MeV

Поглощение пионов в3He при энергиях 100, 120 и 145 МэВ

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Il Nuovo Cimento A (1965-1970)

Summary

π+ true absorption cross-section on3He has been measured at 100, 120, and 145 MeV. The maximal total cross-section values of the reaction π+3He→ppp turn out to be 10, 16, and 19 mb, respectively. About 16% of the cross-section corresponds to three-nucleon absorption. The measured angular distribution as a function of the opening angle between the two fast protons has been fitted with the Legendre polynomial expansionA 0+A2P2(cos θ). The values of the coefficients turn out to beA 0=(1.7±0.5) mb/sr, andA 2=(1.4±0.5) mb/sr, in agreement with the values obtained in the study of the pion absorption on deuteron.

Riassunto

Sono state misurate le sezioni d'urto d'assorbimento di pioni su3He a 100, 120, e 145 MeV. Il valore massimo delle sezioni d'urto è rispettivamente 10, 16 e 19 mb. Circa 1/6 di tali valori corrisponde all'assorbimento su tre nucleoni. La distribuzione angolare in funzione dell'angolo nel centro di massa tra i due protoni veloci è stata rappresentata con lo sviluppo polinomiale di LegendreA 0+A2P2(cos θ). I valori diA 0=(1.7±0.5) mb/sr, eA 2=(1.4±0.4) mb/sr sono in accordo con gli analoghi valori ottenuti nell'assorbimento di pioni nel deuterio.

Резюме

Измерялось поперечное сечение погщенения π+-пионоб в3He при энергиях 100, 120 и 145 МэВ. Максимальные значения полного поперечного сечения реакции π+3He→ppp соответственно равны 10, 16 и 19 мдарн. Около 16% поперечного сечения соответствует трех-нуклонному поглоэению. Измеренное угловое распределние, как функция угла между двумя быстрыми протонами, описывается с помощью разложения по полиномам ЛежандраA 0+A2P2 (cosθ). Значения копффициентов оказываются равнымиA 0=(1.7±0.5) мбарн/ср иA 2=(1.4±0.5) мбарн/ср, что согласуется с величинами, полученными при исследовании поглощения пионов на дейтерии.

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Authors and Affiliations

  1. Faculty of Physics, Bucharest State University, Bucharest, Romania

    T. Angelescu, A. Mihul, L. Pascu & T. Preda

  2. Institute for Physics and Nuclear Engineering, Bucharest, Romania

    I. Lazanu

  3. Polytechnical Institute of Bucharest, Bucharest, Romania

    R. Ionica

  4. Istituto di Fisica Generale dell'Università, Torino

    R. Garfagnini & G. Piragino

  5. INFN, Sezione di Torino, Torino, Italia

    R. Garfagnini & G. Piragino

  6. Joint Institute for Nuclear Research, Dubna, U.S.S.R.

    V. I. Lyashenko, I. V. Falomkin & Yu. A. Shcherbakov

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  1. T. Angelescu
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  2. A. Mihul
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  5. I. Lazanu
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Перевебено ребакцией.

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Angelescu, T., Mihul, A., Pascu, L. et al. Pion absorption in3He at 100, 120, and 145 MeV. Nuov Cim A 103, 93–104 (1990). https://doi.org/10.1007/BF02902622

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